qt-* (Qt6 pkgs): new versions 6.5.0, 6.5.1 (#36705)

* qt-base: new version 6.5.0

* qt-declarative: new version 6.5.0

* qt-quick3d: new version 6.5.0

* qt-quicktimeline: new version 6.5.0

* qt-shadertools: new version 6.5.0

* qt-*: new version 6.5.1

* qt-base: new version 6.5.1

.github/workflows/audit.yaml

@@ -19,7 +19,7 @@ jobs:
   package-audits:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0 # @v2
       with:
         python-version: ${{inputs.python_version}}

.github/workflows/bootstrap.yml

@@ -24,7 +24,7 @@ jobs:
               make patch unzip which xz python3 python3-devel tree \
               cmake bison bison-devel libstdc++-static
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
         with:
           fetch-depth: 0
       - name: Setup non-root user
@@ -62,7 +62,7 @@ jobs:
               make patch unzip xz-utils python3 python3-dev tree \
               cmake bison
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
         with:
           fetch-depth: 0
       - name: Setup non-root user
@@ -99,7 +99,7 @@ jobs:
               bzip2 curl file g++ gcc gfortran git gnupg2 gzip \
               make patch unzip xz-utils python3 python3-dev tree
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
         with:
           fetch-depth: 0
       - name: Setup non-root user
@@ -133,7 +133,7 @@ jobs:
               make patch unzip which xz python3 python3-devel tree \
               cmake bison
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
         with:
           fetch-depth: 0
       - name: Setup repo
@@ -158,7 +158,7 @@ jobs:
         run: |
           brew install cmake bison@2.7 tree
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       - name: Bootstrap clingo
         run: |
           source share/spack/setup-env.sh
@@ -179,7 +179,7 @@ jobs:
         run: |
           brew install tree
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       - name: Bootstrap clingo
         run: |
           set -ex
@@ -204,7 +204,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
         with:
           fetch-depth: 0
       - name: Setup repo
@@ -247,7 +247,7 @@ jobs:
               bzip2 curl file g++ gcc patchelf gfortran git gzip \
               make patch unzip xz-utils python3 python3-dev tree
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
         with:
           fetch-depth: 0
       - name: Setup non-root user
@@ -283,7 +283,7 @@ jobs:
               make patch unzip xz-utils python3 python3-dev tree \
               gawk
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
         with:
           fetch-depth: 0
       - name: Setup non-root user
@@ -316,7 +316,7 @@ jobs:
           # Remove GnuPG since we want to bootstrap it
           sudo rm -rf /usr/local/bin/gpg
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       - name: Bootstrap GnuPG
         run: |
           source share/spack/setup-env.sh
@@ -333,7 +333,7 @@ jobs:
           # Remove GnuPG since we want to bootstrap it
           sudo rm -rf /usr/local/bin/gpg
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       - name: Bootstrap GnuPG
         run: |
           source share/spack/setup-env.sh

.github/workflows/build-containers.yml

@@ -56,7 +56,7 @@ jobs:
     if: github.repository == 'spack/spack'
     steps:
       - name: Checkout
-        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
 
       - name: Set Container Tag Normal (Nightly)
         run: |
@@ -92,13 +92,13 @@ jobs:
           path: dockerfiles
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@e81a89b1732b9c48d79cd809d8d81d79c4647a18 # @v1
+        uses: docker/setup-qemu-action@2b82ce82d56a2a04d2637cd93a637ae1b359c0a7 # @v1
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@4b4e9c3e2d4531116a6f8ba8e71fc6e2cb6e6c8c # @v1
+        uses: docker/setup-buildx-action@16c0bc4a6e6ada2cfd8afd41d22d95379cf7c32a # @v1
 
       - name: Log in to GitHub Container Registry
-        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a # @v1
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # @v1
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -106,13 +106,13 @@ jobs:
 
       - name: Log in to DockerHub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a # @v1
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # @v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build & Deploy ${{ matrix.dockerfile[0] }}
-        uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671 # @v2
+        uses: docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825 # @v2
         with:
           context: dockerfiles/${{ matrix.dockerfile[0] }}
           platforms: ${{ matrix.dockerfile[1] }}

.github/workflows/ci.yaml

@@ -35,7 +35,7 @@ jobs:
       core: ${{ steps.filter.outputs.core }}
       packages: ${{ steps.filter.outputs.packages }}
     steps:
-      - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+      - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
         if: ${{ github.event_name == 'push' }}
         with:
           fetch-depth: 0

.github/workflows/nightly-win-builds.yml

@@ -14,7 +14,7 @@ jobs:
   build-paraview-deps:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0

.github/workflows/unit_tests.yaml

@@ -47,7 +47,7 @@ jobs:
           on_develop: false
 
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0 # @v2
@@ -94,7 +94,7 @@ jobs:
   shell:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0 # @v2
@@ -133,7 +133,7 @@ jobs:
           dnf install -y \
               bzip2 curl file gcc-c++ gcc gcc-gfortran git gnupg2 gzip \
               make patch tcl unzip which xz
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
     - name: Setup repo and non-root user
       run: |
           git --version
@@ -152,7 +152,7 @@ jobs:
   clingo-cffi:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0 # @v2
@@ -186,7 +186,7 @@ jobs:
       matrix:
         python-version: ["3.10"]
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0 # @v2

.github/workflows/valid-style.yml

@@ -18,7 +18,7 @@ jobs:
   validate:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0 # @v2
       with:
         python-version: '3.11'
@@ -35,7 +35,7 @@ jobs:
   style:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0 # @v2
@@ -68,7 +68,7 @@ jobs:
           dnf install -y \
               bzip2 curl file gcc-c++ gcc gcc-gfortran git gnupg2 gzip \
               make patch tcl unzip which xz
-      - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # @v2
+      - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # @v2
       - name: Setup repo and non-root user
         run: |
           git --version
@@ -81,6 +81,7 @@ jobs:
         shell: runuser -u spack-test -- bash {0}
         run: |
           source share/spack/setup-env.sh
+          spack debug report
           spack -d bootstrap now --dev
           spack style -t black
           spack unit-test -V

.github/workflows/windows_python.yml

@@ -15,7 +15,7 @@ jobs:
   unit-tests:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0
@@ -39,7 +39,7 @@ jobs:
   unit-tests-cmd:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0
@@ -63,7 +63,7 @@ jobs:
   build-abseil:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
+    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
       with:
         fetch-depth: 0
     - uses: actions/setup-python@bd6b4b6205c4dbad673328db7b31b7fab9e241c0

bin/spack

@@ -25,8 +25,6 @@ exit 1
 # Line above is a shell no-op, and ends a python multi-line comment.
 # The code above runs this file with our preferred python interpreter.
 
-from __future__ import print_function
-
 import os
 import os.path
 import sys

bin/spack.bat

@@ -214,7 +214,7 @@ goto :end_switch
 if defined _sp_args (
     if NOT "%_sp_args%"=="%_sp_args:--help=%" (
         goto :default_case
-    ) else if NOT "%_sp_args%"=="%_sp_args: -h=%" (
+    ) else if NOT "%_sp_args%"=="%_sp_args:-h=%" (
         goto :default_case
     ) else if NOT "%_sp_args%"=="%_sp_args:--bat=%" (
         goto :default_case

bin/spack.ps1

@@ -0,0 +1,132 @@
+#  Copyright 2013-2023 Lawrence Livermore National Security, LLC and other
+#  Spack Project Developers. See the top-level COPYRIGHT file for details.
+
+#  SPDX-License-Identifier: (Apache-2.0 OR MIT)
+# #######################################################################
+
+function Compare-CommonArgs {
+    $CMDArgs = $args[0]
+    # These aruments take precedence and call for no futher parsing of arguments
+    # invoke actual Spack entrypoint with that context and exit after
+    "--help", "-h", "--version", "-V" | ForEach-Object {
+        $arg_opt = $_
+        if(($CMDArgs) -and ([bool]($CMDArgs.Where({$_ -eq $arg_opt})))) {
+            return $true
+        }
+    }
+    return $false
+}
+
+function Read-SpackArgs {
+    $SpackCMD_params = @()
+    $SpackSubCommand = $NULL
+    $SpackSubCommandArgs = @()
+    $args_ = $args[0]
+    $args_ | ForEach-Object {
+        if (!$SpackSubCommand) {
+            if($_.SubString(0,1) -eq "-")
+            {
+                $SpackCMD_params += $_
+            }
+            else{
+                $SpackSubCommand = $_
+            }
+        }
+        else{
+            $SpackSubCommandArgs += $_
+        }
+    }
+    return $SpackCMD_params, $SpackSubCommand, $SpackSubCommandArgs
+}
+
+function Invoke-SpackCD {
+    if (Compare-CommonArgs $SpackSubCommandArgs) {
+        python $Env:SPACK_ROOT/bin/spack cd -h
+    }
+    else {
+        $LOC = $(python $Env:SPACK_ROOT/bin/spack location $SpackSubCommandArgs)
+        if (($NULL -ne $LOC)){
+            if ( Test-Path -Path $LOC){
+                Set-Location $LOC
+            }
+            else{
+                exit 1
+            }
+        }
+        else {
+            exit 1
+        }
+    }
+}
+
+function Invoke-SpackEnv {
+    if (Compare-CommonArgs $SpackSubCommandArgs[0]) {
+        python $Env:SPACK_ROOT/bin/spack env -h
+    }
+    else {
+        $SubCommandSubCommand = $SpackSubCommandArgs[0]
+        $SubCommandSubCommandArgs = $SpackSubCommandArgs[1..$SpackSubCommandArgs.Count]
+        switch ($SubCommandSubCommand) {
+            "activate" {
+                if (Compare-CommonArgs $SubCommandSubCommandArgs) {
+                    python $Env:SPACK_ROOT/bin/spack env activate $SubCommandSubCommandArgs
+                }
+                elseif ([bool]($SubCommandSubCommandArgs.Where({$_ -eq "--pwsh"}))) {
+                    python $Env:SPACK_ROOT/bin/spack env activate $SubCommandSubCommandArgs
+                }
+                elseif (!$SubCommandSubCommandArgs) {
+                    python $Env:SPACK_ROOT/bin/spack env activate $SubCommandSubCommandArgs
+                }
+                else {
+                    $SpackEnv = $(python $Env:SPACK_ROOT/bin/spack $SpackCMD_params env activate "--pwsh" $SubCommandSubCommandArgs)
+                    $ExecutionContext.InvokeCommand($SpackEnv)
+                }
+            }
+            "deactivate" {
+                if ([bool]($SubCommandSubCommandArgs.Where({$_ -eq "--pwsh"}))) {
+                    python $Env:SPACK_ROOT/bin/spack env deactivate $SubCommandSubCommandArgs
+                }
+                elseif($SubCommandSubCommandArgs) {
+                    python $Env:SPACK_ROOT/bin/spack env deactivate -h
+                }
+                else {
+                    $SpackEnv = $(python $Env:SPACK_ROOT/bin/spack $SpackCMD_params env deactivate --pwsh)
+                    $ExecutionContext.InvokeCommand($SpackEnv)
+                }
+            }
+            default {python $Env:SPACK_ROOT/bin/spack $SpackCMD_params $SpackSubCommand $SpackSubCommandArgs}
+        }
+    }
+}
+
+function Invoke-SpackLoad {
+    if (Compare-CommonArgs $SpackSubCommandArgs) {
+        python $Env:SPACK_ROOT/bin/spack $SpackCMD_params $SpackSubCommand $SpackSubCommandArgs
+    }
+    elseif ([bool]($SpackSubCommandArgs.Where({($_ -eq "--pwsh") -or ($_ -eq "--list")}))) {
+        python $Env:SPACK_ROOT/bin/spack $SpackCMD_params $SpackSubCommand $SpackSubCommandArgs
+    }
+    else {
+        $SpackEnv = $(python $Env:SPACK_ROOT/bin/spack $SpackCMD_params $SpackSubCommand "--pwsh" $SpackSubCommandArgs)
+        $ExecutionContext.InvokeCommand($SpackEnv)
+    }
+}
+
+
+$SpackCMD_params, $SpackSubCommand, $SpackSubCommandArgs = Read-SpackArgs $args
+
+if (Compare-CommonArgs $SpackCMD_params) {
+    python $Env:SPACK_ROOT/bin/spack $SpackCMD_params $SpackSubCommand $SpackSubCommandArgs
+    exit $LASTEXITCODE
+}
+
+# Process Spack commands with special conditions
+# all other commands are piped directly to Spack
+switch($SpackSubCommand)
+{
+    "cd"     {Invoke-SpackCD}
+    "env"    {Invoke-SpackEnv}
+    "load"   {Invoke-SpackLoad}
+    "unload" {Invoke-SpackLoad}
+    default  {python $Env:SPACK_ROOT/bin/spack $SpackCMD_params $SpackSubCommand $SpackSubCommandArgs}
+}

lib/spack/docs/build_systems/inteloneapipackage.rst

@@ -76,6 +76,53 @@ To build with with ``icx``, do ::
 
   spack install patchelf%oneapi
 
+
+Using oneAPI Spack environment
+-------------------------------
+
+In this example, we build lammps with ``icx`` using Spack environment for oneAPI packages created by Intel. The
+compilers are installed with Spack like in example above.
+
+Install the oneAPI compilers::
+
+  spack install intel-oneapi-compilers
+
+Add the compilers to your ``compilers.yaml`` so Spack can use them::
+
+  spack compiler add `spack location -i intel-oneapi-compilers`/compiler/latest/linux/bin/intel64
+  spack compiler add `spack location -i intel-oneapi-compilers`/compiler/latest/linux/bin
+
+Verify that the compilers are available::
+
+  spack compiler list
+
+Clone `spack-configs <https://github.com/spack/spack-configs>`_ repo and activate Intel oneAPI CPU environment::
+
+  git clone https://github.com/spack/spack-configs
+  spack env activate spack-configs/INTEL/CPU
+  spack concretize -f
+
+`Intel oneAPI CPU environment <https://github.com/spack/spack-configs/blob/main/INTEL/CPU/spack.yaml>`_  contains applications tested and validated by Intel, this list is constantly extended. And currently it supports:
+
+- `GROMACS <https://www.gromacs.org/>`_
+- `HPCG <https://www.hpcg-benchmark.org/>`_
+- `HPL <https://netlib.org/benchmark/hpl/>`_
+- `LAMMPS <https://www.lammps.org/#gsc.tab=0>`_
+- `OpenFOAM <https://www.openfoam.com/>`_
+- `STREAM <https://www.cs.virginia.edu/stream/>`_
+- `WRF <https://github.com/wrf-model/WRF>`_
+
+To build lammps with oneAPI compiler from this environment just run::
+
+  spack install lammps
+
+Compiled binaries can be find using::
+
+  spack cd -i lammps
+
+You can do the same for all other applications from this environment.
+
+
 Using oneAPI MPI to Satisfy a Virtual Dependence
 ------------------------------------------------------
 

lib/spack/docs/build_systems/sippackage.rst

@@ -72,7 +72,7 @@ arguments to the configure phase, you can use:
 
 .. code-block:: python
 
-   def configure_args(self, spec, prefix):
+   def configure_args(self):
        return ['--no-python-dbus']
 
 

lib/spack/docs/conf.py

@@ -97,9 +97,7 @@ class PatchedPythonDomain(PythonDomain):
     def resolve_xref(self, env, fromdocname, builder, typ, target, node, contnode):
         if "refspecific" in node:
             del node["refspecific"]
-        return super(PatchedPythonDomain, self).resolve_xref(
-            env, fromdocname, builder, typ, target, node, contnode
-        )
+        return super().resolve_xref(env, fromdocname, builder, typ, target, node, contnode)
 
 
 #

lib/spack/docs/environments.rst

@@ -916,9 +916,9 @@ function, as shown in the example below:
 .. code-block:: yaml
 
    projections:
-     zlib: {name}-{version}
-     ^mpi: {name}-{version}/{^mpi.name}-{^mpi.version}-{compiler.name}-{compiler.version}
-     all: {name}-{version}/{compiler.name}-{compiler.version}
+     zlib: "{name}-{version}"
+     ^mpi: "{name}-{version}/{^mpi.name}-{^mpi.version}-{compiler.name}-{compiler.version}"
+     all: "{name}-{version}/{compiler.name}-{compiler.version}"
 
 The entries in the projections configuration file must all be either
 specs or the keyword ``all``. For each spec, the projection used will
@@ -1132,11 +1132,11 @@ index once every package is pushed. Note how this target uses the generated
    example/push/%: example/install/%
    	@mkdir -p $(dir $@)
    	$(info About to push $(SPEC) to a buildcache)
-   	$(SPACK) -e . buildcache create --allow-root --only=package --directory $(BUILDCACHE_DIR) /$(HASH)
+   	$(SPACK) -e . buildcache push --allow-root --only=package $(BUILDCACHE_DIR) /$(HASH)
    	@touch $@
 
    push: $(addprefix example/push/,$(example/SPACK_PACKAGE_IDS))
    	$(info Updating the buildcache index)
-   	$(SPACK) -e . buildcache update-index --directory $(BUILDCACHE_DIR)
+   	$(SPACK) -e . buildcache update-index $(BUILDCACHE_DIR)
    	$(info Done!)
    	@touch $@

lib/spack/docs/packaging_guide.rst

@@ -121,7 +121,7 @@ Since v0.19, Spack supports  two ways of writing a package recipe. The most comm
 
        def url_for_version(self, version):
            if version >= Version("2.1.1"):
-               return super(Openjpeg, self).url_for_version(version)
+               return super().url_for_version(version)
            url_fmt = "https://github.com/uclouvain/openjpeg/archive/version.{0}.tar.gz"
            return url_fmt.format(version)
 
@@ -155,7 +155,7 @@ builder class explicitly. Using the same example as above, this reads:
 
        def url_for_version(self, version):
            if version >= Version("2.1.1"):
-               return super(Openjpeg, self).url_for_version(version)
+               return super().url_for_version(version)
            url_fmt = "https://github.com/uclouvain/openjpeg/archive/version.{0}.tar.gz"
            return url_fmt.format(version)
 
@@ -3071,7 +3071,7 @@ follows:
        # The library provided by the bar virtual package
        @property
        def bar_libs(self):
-           return find_libraries("libFooBar", root=sef.home, recursive=True)
+           return find_libraries("libFooBar", root=self.home, recursive=True)
 
        # The baz virtual package home
        @property

lib/spack/docs/requirements.txt

@@ -1,8 +1,8 @@
 sphinx==6.2.1
 sphinxcontrib-programoutput==0.17
 sphinx_design==0.4.1
-sphinx-rtd-theme==1.2.1
-python-levenshtein==0.21.0
+sphinx-rtd-theme==1.2.2
+python-levenshtein==0.21.1
 docutils==0.18.1
 pygments==2.15.1
-urllib3==2.0.2
+urllib3==2.0.3

lib/spack/env/cc

@@ -416,30 +416,14 @@ input_command="$*"
 # The lists are all bell-separated to be as flexible as possible, as their
 # contents may come from the command line, from ' '-separated lists,
 # ':'-separated lists, etc.
-include_dirs_list=""
-lib_dirs_list=""
-rpath_dirs_list=""
-system_include_dirs_list=""
-system_lib_dirs_list=""
-system_rpath_dirs_list=""
-isystem_system_include_dirs_list=""
-isystem_include_dirs_list=""
-libs_list=""
-other_args_list=""
-
-# Global state for keeping track of -Wl,-rpath -Wl,/path
-wl_expect_rpath=no
-
-# Same, but for -Xlinker -rpath -Xlinker /path
-xlinker_expect_rpath=no
 
 parse_Wl() {
     while [ $# -ne 0 ]; do
     if [ "$wl_expect_rpath" = yes ]; then
         if system_dir "$1"; then
-            append system_rpath_dirs_list "$1"
+            append return_system_rpath_dirs_list "$1"
         else
-            append rpath_dirs_list "$1"
+            append return_rpath_dirs_list "$1"
         fi
         wl_expect_rpath=no
     else
@@ -449,9 +433,9 @@ parse_Wl() {
                 if [ -z "$arg" ]; then
                     shift; continue
                 elif system_dir "$arg"; then
-                    append system_rpath_dirs_list "$arg"
+                    append return_system_rpath_dirs_list "$arg"
                 else
-                    append rpath_dirs_list "$arg"
+                    append return_rpath_dirs_list "$arg"
                 fi
                 ;;
             --rpath=*)
@@ -459,9 +443,9 @@ parse_Wl() {
                 if [ -z "$arg" ]; then
                     shift; continue
                 elif system_dir "$arg"; then
-                    append system_rpath_dirs_list "$arg"
+                    append return_system_rpath_dirs_list "$arg"
                 else
-                    append rpath_dirs_list "$arg"
+                    append return_rpath_dirs_list "$arg"
                 fi
                 ;;
             -rpath|--rpath)
@@ -475,7 +459,7 @@ parse_Wl() {
                 return 1
                 ;;
             *)
-                append other_args_list "-Wl,$1"
+                append return_other_args_list "-Wl,$1"
                 ;;
         esac
     fi
@@ -483,177 +467,210 @@ parse_Wl() {
     done
 }
 
+categorize_arguments() {
 
-while [ $# -ne 0 ]; do
+    unset IFS
 
-    # an RPATH to be added after the case statement.
-    rp=""
+    return_other_args_list=""
+    return_isystem_was_used=""
+    return_isystem_system_include_dirs_list=""
+    return_isystem_include_dirs_list=""
+    return_system_include_dirs_list=""
+    return_include_dirs_list=""
+    return_system_lib_dirs_list=""
+    return_lib_dirs_list=""
+    return_system_rpath_dirs_list=""
+    return_rpath_dirs_list=""
 
-    # Multiple consecutive spaces in the command line can
-    # result in blank arguments
-    if [ -z "$1" ]; then
-        shift
-        continue
-    fi
+    # Global state for keeping track of -Wl,-rpath -Wl,/path
+    wl_expect_rpath=no
 
-    if [ -n "${SPACK_COMPILER_FLAGS_KEEP}" ] ; then
-        # NOTE: the eval is required to allow `|` alternatives inside the variable
-        eval "\
-        case \"\$1\" in
-            $SPACK_COMPILER_FLAGS_KEEP)
-                append other_args_list \"\$1\"
+    # Same, but for -Xlinker -rpath -Xlinker /path
+    xlinker_expect_rpath=no
+
+    while [ $# -ne 0 ]; do
+
+        # an RPATH to be added after the case statement.
+        rp=""
+
+        # Multiple consecutive spaces in the command line can
+        # result in blank arguments
+        if [ -z "$1" ]; then
+            shift
+            continue
+        fi
+
+        if [ -n "${SPACK_COMPILER_FLAGS_KEEP}" ] ; then
+            # NOTE: the eval is required to allow `|` alternatives inside the variable
+            eval "\
+            case \"\$1\" in
+                $SPACK_COMPILER_FLAGS_KEEP)
+                    append return_other_args_list \"\$1\"
+                    shift
+                    continue
+                    ;;
+            esac
+            "
+        fi
+        # the replace list is a space-separated list of pipe-separated pairs,
+        # the first in each pair is the original prefix to be matched, the
+        # second is the replacement prefix
+        if [ -n "${SPACK_COMPILER_FLAGS_REPLACE}" ] ; then
+            for rep in ${SPACK_COMPILER_FLAGS_REPLACE} ; do
+                before=${rep%|*}
+                after=${rep#*|}
+                eval "\
+                stripped=\"\${1##$before}\"
+                "
+                if [ "$stripped" = "$1" ] ; then
+                    continue
+                fi
+
+                replaced="$after$stripped" 
+
+                # it matched, remove it
                 shift
-                continue
+
+                if [ -z "$replaced" ] ; then
+                    # completely removed, continue OUTER loop
+                    continue 2
+                fi
+
+                # re-build argument list with replacement
+                set -- "$replaced" "$@"
+            done
+        fi
+
+        case "$1" in
+            -isystem*)
+                arg="${1#-isystem}"
+                return_isystem_was_used=true
+                if [ -z "$arg" ]; then shift; arg="$1"; fi
+                if system_dir "$arg"; then
+                    append return_isystem_system_include_dirs_list "$arg"
+                else
+                    append return_isystem_include_dirs_list "$arg"
+                fi
+                ;;
+            -I*)
+                arg="${1#-I}"
+                if [ -z "$arg" ]; then shift; arg="$1"; fi
+                if system_dir "$arg"; then
+                    append return_system_include_dirs_list "$arg"
+                else
+                    append return_include_dirs_list "$arg"
+                fi
+                ;;
+            -L*)
+                arg="${1#-L}"
+                if [ -z "$arg" ]; then shift; arg="$1"; fi
+                if system_dir "$arg"; then
+                    append return_system_lib_dirs_list "$arg"
+                else
+                    append return_lib_dirs_list "$arg"
+                fi
+                ;;
+            -l*)
+                # -loopopt=0 is generated erroneously in autoconf <= 2.69,
+                # and passed by ifx to the linker, which confuses it with a
+                # library. Filter it out.
+                # TODO: generalize filtering of args with an env var, so that
+                # TODO: we do not have to special case this here.
+                if { [ "$mode" = "ccld" ] || [ $mode = "ld" ]; } \
+                    && [ "$1" != "${1#-loopopt}" ]; then
+                    shift
+                    continue
+                fi
+                arg="${1#-l}"
+                if [ -z "$arg" ]; then shift; arg="$1"; fi
+                append return_other_args_list "-l$arg"
+                ;;
+            -Wl,*)
+                IFS=,
+                if ! parse_Wl ${1#-Wl,}; then
+                    append return_other_args_list "$1"
+                fi
+                unset IFS
+                ;;
+            -Xlinker)
+                shift
+                if [ $# -eq 0 ]; then
+                    # -Xlinker without value: let the compiler error about it.
+                    append return_other_args_list -Xlinker
+                    xlinker_expect_rpath=no
+                    break
+                elif [ "$xlinker_expect_rpath" = yes ]; then
+                    # Register the path of -Xlinker -rpath <other args> -Xlinker <path>
+                    if system_dir "$1"; then
+                        append return_system_rpath_dirs_list "$1"
+                    else
+                        append return_rpath_dirs_list "$1"
+                    fi
+                    xlinker_expect_rpath=no
+                else
+                    case "$1" in
+                        -rpath=*)
+                            arg="${1#-rpath=}"
+                            if system_dir "$arg"; then
+                                append return_system_rpath_dirs_list "$arg"
+                            else
+                                append return_rpath_dirs_list "$arg"
+                            fi
+                            ;;
+                        --rpath=*)
+                            arg="${1#--rpath=}"
+                            if system_dir "$arg"; then
+                                append return_system_rpath_dirs_list "$arg"
+                            else
+                                append return_rpath_dirs_list "$arg"
+                            fi
+                            ;;
+                        -rpath|--rpath)
+                            xlinker_expect_rpath=yes
+                            ;;
+                        "$dtags_to_strip")
+                            ;;
+                        *)
+                            append return_other_args_list -Xlinker
+                            append return_other_args_list "$1"
+                            ;;
+                    esac
+                fi
+                ;;
+            "$dtags_to_strip")
+                ;;
+            *)
+                append return_other_args_list "$1"
                 ;;
         esac
-        "
-    fi
-    # the replace list is a space-separated list of pipe-separated pairs,
-    # the first in each pair is the original prefix to be matched, the
-    # second is the replacement prefix
-    if [ -n "${SPACK_COMPILER_FLAGS_REPLACE}" ] ; then
-        for rep in ${SPACK_COMPILER_FLAGS_REPLACE} ; do
-            before=${rep%|*}
-            after=${rep#*|}
-            eval "\
-            stripped=\"\${1##$before}\"
-            "
-            if [ "$stripped" = "$1" ] ; then
-                continue
-            fi
+        shift
+    done
 
-            replaced="$after$stripped" 
-
-            # it matched, remove it
-            shift
-
-            if [ -z "$replaced" ] ; then
-                # completely removed, continue OUTER loop
-                continue 2
-            fi
-
-            # re-build argument list with replacement
-            set -- "$replaced" "$@"
-        done
+    # We found `-Xlinker -rpath` but no matching value `-Xlinker /path`. Just append
+    # `-Xlinker -rpath` again and let the compiler or linker handle the error during arg
+    # parsing.
+    if [ "$xlinker_expect_rpath" = yes ]; then
+        append return_other_args_list -Xlinker
+        append return_other_args_list -rpath
     fi
 
-    case "$1" in
-        -isystem*)
-            arg="${1#-isystem}"
-            isystem_was_used=true
-            if [ -z "$arg" ]; then shift; arg="$1"; fi
-            if system_dir "$arg"; then
-                append isystem_system_include_dirs_list "$arg"
-            else
-                append isystem_include_dirs_list "$arg"
-            fi
-            ;;
-        -I*)
-            arg="${1#-I}"
-            if [ -z "$arg" ]; then shift; arg="$1"; fi
-            if system_dir "$arg"; then
-                append system_include_dirs_list "$arg"
-            else
-                append include_dirs_list "$arg"
-            fi
-            ;;
-        -L*)
-            arg="${1#-L}"
-            if [ -z "$arg" ]; then shift; arg="$1"; fi
-            if system_dir "$arg"; then
-                append system_lib_dirs_list "$arg"
-            else
-                append lib_dirs_list "$arg"
-            fi
-            ;;
-        -l*)
-            # -loopopt=0 is generated erroneously in autoconf <= 2.69,
-            # and passed by ifx to the linker, which confuses it with a
-            # library. Filter it out.
-            # TODO: generalize filtering of args with an env var, so that
-            # TODO: we do not have to special case this here.
-            if { [ "$mode" = "ccld" ] || [ $mode = "ld" ]; } \
-                && [ "$1" != "${1#-loopopt}" ]; then
-                shift
-                continue
-            fi
-            arg="${1#-l}"
-            if [ -z "$arg" ]; then shift; arg="$1"; fi
-            append other_args_list "-l$arg"
-            ;;
-        -Wl,*)
-            IFS=,
-            if ! parse_Wl ${1#-Wl,}; then
-                append other_args_list "$1"
-            fi
-            unset IFS
-            ;;
-        -Xlinker)
-            shift
-            if [ $# -eq 0 ]; then
-                # -Xlinker without value: let the compiler error about it.
-                append other_args_list -Xlinker
-                xlinker_expect_rpath=no
-                break
-            elif [ "$xlinker_expect_rpath" = yes ]; then
-                # Register the path of -Xlinker -rpath <other args> -Xlinker <path>
-                if system_dir "$1"; then
-                    append system_rpath_dirs_list "$1"
-                else
-                    append rpath_dirs_list "$1"
-                fi
-                xlinker_expect_rpath=no
-            else
-                case "$1" in
-                    -rpath=*)
-                        arg="${1#-rpath=}"
-                        if system_dir "$arg"; then
-                            append system_rpath_dirs_list "$arg"
-                        else
-                            append rpath_dirs_list "$arg"
-                        fi
-                        ;;
-                    --rpath=*)
-                        arg="${1#--rpath=}"
-                        if system_dir "$arg"; then
-                            append system_rpath_dirs_list "$arg"
-                        else
-                            append rpath_dirs_list "$arg"
-                        fi
-                        ;;
-                    -rpath|--rpath)
-                        xlinker_expect_rpath=yes
-                        ;;
-                    "$dtags_to_strip")
-                        ;;
-                    *)
-                        append other_args_list -Xlinker
-                        append other_args_list "$1"
-                        ;;
-                esac
-            fi
-            ;;
-        "$dtags_to_strip")
-            ;;
-        *)
-            append other_args_list "$1"
-            ;;
-    esac
-    shift
-done
+    # Same, but for -Wl flags.
+    if [ "$wl_expect_rpath" = yes ]; then
+        append return_other_args_list -Wl,-rpath
+    fi
+}
 
-# We found `-Xlinker -rpath` but no matching value `-Xlinker /path`. Just append
-# `-Xlinker -rpath` again and let the compiler or linker handle the error during arg
-# parsing.
-if [ "$xlinker_expect_rpath" = yes ]; then
-    append other_args_list -Xlinker
-    append other_args_list -rpath
-fi
-
-# Same, but for -Wl flags.
-if [ "$wl_expect_rpath" = yes ]; then
-    append other_args_list -Wl,-rpath
-fi
+categorize_arguments "$@"
+    include_dirs_list="$return_include_dirs_list"
+    lib_dirs_list="$return_lib_dirs_list"
+    rpath_dirs_list="$return_rpath_dirs_list"
+    system_include_dirs_list="$return_system_include_dirs_list"
+    system_lib_dirs_list="$return_system_lib_dirs_list"
+    system_rpath_dirs_list="$return_system_rpath_dirs_list"
+    isystem_was_used="$return_isystem_was_used"
+    isystem_system_include_dirs_list="$return_isystem_system_include_dirs_list"
+    isystem_include_dirs_list="$return_isystem_include_dirs_list"
+    other_args_list="$return_other_args_list"
 
 #
 # Add flags from Spack's cppflags, cflags, cxxflags, fcflags, fflags, and
@@ -673,12 +690,14 @@ elif [ "$SPACK_ADD_DEBUG_FLAGS" = "custom" ]; then
     extend flags_list SPACK_DEBUG_FLAGS
 fi
 
+spack_flags_list=""
+
 # Fortran flags come before CPPFLAGS
 case "$mode" in
     cc|ccld)
         case $lang_flags in
             F)
-                extend flags_list SPACK_FFLAGS
+                extend spack_flags_list SPACK_FFLAGS
                 ;;
         esac
         ;;
@@ -687,7 +706,7 @@ esac
 # C preprocessor flags come before any C/CXX flags
 case "$mode" in
     cpp|as|cc|ccld)
-        extend flags_list SPACK_CPPFLAGS
+        extend spack_flags_list SPACK_CPPFLAGS
         ;;
 esac
 
@@ -697,10 +716,10 @@ case "$mode" in
     cc|ccld)
         case $lang_flags in
             C)
-                extend flags_list SPACK_CFLAGS
+                extend spack_flags_list SPACK_CFLAGS
                 ;;
             CXX)
-                extend flags_list SPACK_CXXFLAGS
+                extend spack_flags_list SPACK_CXXFLAGS
                 ;;
         esac
 
@@ -712,10 +731,25 @@ esac
 # Linker flags
 case "$mode" in
     ld|ccld)
-        extend flags_list SPACK_LDFLAGS
+        extend spack_flags_list SPACK_LDFLAGS
         ;;
 esac
 
+IFS="$lsep"
+    categorize_arguments $spack_flags_list
+unset IFS
+        spack_flags_include_dirs_list="$return_include_dirs_list"
+        spack_flags_lib_dirs_list="$return_lib_dirs_list"
+        spack_flags_rpath_dirs_list="$return_rpath_dirs_list"
+        spack_flags_system_include_dirs_list="$return_system_include_dirs_list"
+        spack_flags_system_lib_dirs_list="$return_system_lib_dirs_list"
+        spack_flags_system_rpath_dirs_list="$return_system_rpath_dirs_list"
+        spack_flags_isystem_was_used="$return_isystem_was_used"
+        spack_flags_isystem_system_include_dirs_list="$return_isystem_system_include_dirs_list"
+        spack_flags_isystem_include_dirs_list="$return_isystem_include_dirs_list"
+        spack_flags_other_args_list="$return_other_args_list"
+
+
 # On macOS insert headerpad_max_install_names linker flag
 if [ "$mode" = ld ] || [ "$mode" = ccld ]; then
     if [ "${SPACK_SHORT_SPEC#*darwin}" != "${SPACK_SHORT_SPEC}" ]; then
@@ -741,6 +775,8 @@ if [ "$mode" = ccld ] || [ "$mode" = ld ]; then
     extend lib_dirs_list SPACK_LINK_DIRS
 fi
 
+libs_list=""
+
 # add RPATHs if we're in in any linking mode
 case "$mode" in
     ld|ccld)
@@ -769,12 +805,16 @@ args_list="$flags_list"
 
 # Insert include directories just prior to any system include directories
 # NOTE: adding ${lsep} to the prefix here turns every added element into two
+extend args_list spack_flags_include_dirs_list "-I"
 extend args_list include_dirs_list "-I"
+extend args_list spack_flags_isystem_include_dirs_list "-isystem${lsep}"
 extend args_list isystem_include_dirs_list "-isystem${lsep}"
 
 case "$mode" in
     cpp|cc|as|ccld)
-        if [ "$isystem_was_used" = "true" ]; then
+        if [ "$spack_flags_isystem_was_used" = "true" ]; then
+            extend args_list SPACK_INCLUDE_DIRS "-isystem${lsep}"
+        elif [ "$isystem_was_used" = "true" ]; then
             extend args_list SPACK_INCLUDE_DIRS "-isystem${lsep}"
         else
             extend args_list SPACK_INCLUDE_DIRS "-I"
@@ -782,11 +822,15 @@ case "$mode" in
         ;;
 esac
 
+extend args_list spack_flags_system_include_dirs_list -I
 extend args_list system_include_dirs_list -I
+extend args_list spack_flags_isystem_system_include_dirs_list "-isystem${lsep}"
 extend args_list isystem_system_include_dirs_list "-isystem${lsep}"
 
 # Library search paths
+extend args_list spack_flags_lib_dirs_list "-L"
 extend args_list lib_dirs_list "-L"
+extend args_list spack_flags_system_lib_dirs_list "-L"
 extend args_list system_lib_dirs_list "-L"
 
 # RPATHs arguments
@@ -795,20 +839,25 @@ case "$mode" in
         if [ -n "$dtags_to_add" ] ; then
             append args_list "$linker_arg$dtags_to_add"
         fi
+        extend args_list spack_flags_rpath_dirs_list "$rpath"
         extend args_list rpath_dirs_list "$rpath"
+        extend args_list spack_flags_system_rpath_dirs_list "$rpath"
         extend args_list system_rpath_dirs_list "$rpath"
         ;;
     ld)
         if [ -n "$dtags_to_add" ] ; then
             append args_list "$dtags_to_add"
         fi
+        extend args_list spack_flags_rpath_dirs_list "-rpath${lsep}"
         extend args_list rpath_dirs_list "-rpath${lsep}"
+        extend args_list spack_flags_system_rpath_dirs_list "-rpath${lsep}"
         extend args_list system_rpath_dirs_list "-rpath${lsep}"
         ;;
 esac
 
 # Other arguments from the input command
 extend args_list other_args_list
+extend args_list spack_flags_other_args_list
 
 # Inject SPACK_LDLIBS, if supplied
 extend args_list libs_list "-l"
@@ -864,3 +913,4 @@ fi
 # Execute the full command, preserving spaces with IFS set
 # to the alarm bell separator.
 IFS="$lsep"; exec $full_command_list
+

lib/spack/external/ctest_log_parser.py

@@ -65,9 +65,6 @@
 up to date with CTest, just make sure the ``*_matches`` and
 ``*_exceptions`` lists are kept up to date with CTest's build handler.
 """
-from __future__ import print_function
-from __future__ import division
-
 import re
 import math
 import multiprocessing
@@ -211,7 +208,7 @@
 ]
 
 
-class LogEvent(object):
+class LogEvent:
     """Class representing interesting events (e.g., errors) in a build log."""
     def __init__(self, text, line_no,
                  source_file=None, source_line_no=None,
@@ -348,7 +345,7 @@ def _parse_unpack(args):
     return _parse(*args)
 
 
-class CTestLogParser(object):
+class CTestLogParser:
     """Log file parser that extracts errors and warnings."""
     def __init__(self, profile=False):
         # whether to record timing information

lib/spack/llnl/util/argparsewriter.py

@@ -3,33 +3,42 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
+import abc
 import argparse
-import errno
 import io
 import re
 import sys
+from argparse import ArgumentParser
+from typing import IO, Optional, Sequence, Tuple
 
 
-class Command(object):
+class Command:
     """Parsed representation of a command from argparse.
 
-    This is a single command from an argparse parser. ``ArgparseWriter``
-    creates these and returns them from ``parse()``, and it passes one of
-    these to each call to ``format()`` so that we can take an action for
-    a single command.
-
-    Parts of a Command:
-      - prog: command name (str)
-      - description: command description (str)
-      - usage: command usage (str)
-      - positionals: list of positional arguments (list)
-      - optionals: list of optional arguments (list)
-      - subcommands: list of subcommand parsers (list)
+    This is a single command from an argparse parser. ``ArgparseWriter`` creates these and returns
+    them from ``parse()``, and it passes one of these to each call to ``format()`` so that we can
+    take an action for a single command.
     """
 
-    def __init__(self, prog, description, usage, positionals, optionals, subcommands):
+    def __init__(
+        self,
+        prog: str,
+        description: Optional[str],
+        usage: str,
+        positionals: Sequence[Tuple[str, str]],
+        optionals: Sequence[Tuple[Sequence[str], str, str]],
+        subcommands: Sequence[Tuple[ArgumentParser, str]],
+    ) -> None:
+        """Initialize a new Command instance.
+
+        Args:
+            prog: Program name.
+            description: Command description.
+            usage: Command usage.
+            positionals: List of positional arguments.
+            optionals: List of optional arguments.
+            subcommands: List of subcommand parsers.
+        """
         self.prog = prog
         self.description = description
         self.usage = usage
@@ -38,35 +47,34 @@ def __init__(self, prog, description, usage, positionals, optionals, subcommands
         self.subcommands = subcommands
 
 
-# NOTE: The only reason we subclass argparse.HelpFormatter is to get access
-# to self._expand_help(), ArgparseWriter is not intended to be used as a
-# formatter_class.
-class ArgparseWriter(argparse.HelpFormatter):
-    """Analyzes an argparse ArgumentParser for easy generation of help."""
+# NOTE: The only reason we subclass argparse.HelpFormatter is to get access to self._expand_help(),
+# ArgparseWriter is not intended to be used as a formatter_class.
+class ArgparseWriter(argparse.HelpFormatter, abc.ABC):
+    """Analyze an argparse ArgumentParser for easy generation of help."""
 
-    def __init__(self, prog, out=None, aliases=False):
-        """Initializes a new ArgparseWriter instance.
+    def __init__(self, prog: str, out: IO = sys.stdout, aliases: bool = False) -> None:
+        """Initialize a new ArgparseWriter instance.
 
-        Parameters:
-            prog (str): the program name
-            out (file object): the file to write to (default sys.stdout)
-            aliases (bool): whether or not to include subparsers for aliases
+        Args:
+            prog: Program name.
+            out: File object to write to.
+            aliases: Whether or not to include subparsers for aliases.
         """
-        super(ArgparseWriter, self).__init__(prog)
+        super().__init__(prog)
         self.level = 0
         self.prog = prog
-        self.out = sys.stdout if out is None else out
+        self.out = out
         self.aliases = aliases
 
-    def parse(self, parser, prog):
-        """Parses the parser object and returns the relavent components.
+    def parse(self, parser: ArgumentParser, prog: str) -> Command:
+        """Parse the parser object and return the relavent components.
 
-        Parameters:
-            parser (argparse.ArgumentParser): the parser
-            prog (str): the command name
+        Args:
+            parser: Command parser.
+            prog: Program name.
 
         Returns:
-            (Command) information about the command from the parser
+            Information about the command from the parser.
         """
         self.parser = parser
 
@@ -80,8 +88,7 @@ def parse(self, parser, prog):
         groups = parser._mutually_exclusive_groups
         usage = fmt._format_usage(None, actions, groups, "").strip()
 
-        # Go through actions and split them into optionals, positionals,
-        # and subcommands
+        # Go through actions and split them into optionals, positionals, and subcommands
         optionals = []
         positionals = []
         subcommands = []
@@ -98,7 +105,7 @@ def parse(self, parser, prog):
                     subcommands.append((subparser, subaction.dest))
 
                     # Look for aliases of the form 'name (alias, ...)'
-                    if self.aliases:
+                    if self.aliases and isinstance(subaction.metavar, str):
                         match = re.match(r"(.*) \((.*)\)", subaction.metavar)
                         if match:
                             aliases = match.group(2).split(", ")
@@ -113,28 +120,26 @@ def parse(self, parser, prog):
 
         return Command(prog, description, usage, positionals, optionals, subcommands)
 
-    def format(self, cmd):
-        """Returns the string representation of a single node in the
-        parser tree.
+    @abc.abstractmethod
+    def format(self, cmd: Command) -> str:
+        """Return the string representation of a single node in the parser tree.
 
-        Override this in subclasses to define how each subcommand
-        should be displayed.
+        Override this in subclasses to define how each subcommand should be displayed.
 
-        Parameters:
-            (Command): parsed information about a command or subcommand
+        Args:
+            cmd: Parsed information about a command or subcommand.
 
         Returns:
-            str: the string representation of this subcommand
+            String representation of this subcommand.
         """
-        raise NotImplementedError
 
-    def _write(self, parser, prog, level=0):
-        """Recursively writes a parser.
+    def _write(self, parser: ArgumentParser, prog: str, level: int = 0) -> None:
+        """Recursively write a parser.
 
-        Parameters:
-            parser (argparse.ArgumentParser): the parser
-            prog (str): the command name
-            level (int): the current level
+        Args:
+            parser: Command parser.
+            prog: Program name.
+            level: Current level.
         """
         self.level = level
 
@@ -144,19 +149,17 @@ def _write(self, parser, prog, level=0):
         for subparser, prog in cmd.subcommands:
             self._write(subparser, prog, level=level + 1)
 
-    def write(self, parser):
+    def write(self, parser: ArgumentParser) -> None:
         """Write out details about an ArgumentParser.
 
         Args:
-            parser (argparse.ArgumentParser): the parser
+            parser: Command parser.
         """
         try:
             self._write(parser, self.prog)
-        except IOError as e:
+        except BrokenPipeError:
             # Swallow pipe errors
-            # Raises IOError in Python 2 and BrokenPipeError in Python 3
-            if e.errno != errno.EPIPE:
-                raise
+            pass
 
 
 _rst_levels = ["=", "-", "^", "~", ":", "`"]
@@ -165,21 +168,33 @@ def write(self, parser):
 class ArgparseRstWriter(ArgparseWriter):
     """Write argparse output as rst sections."""
 
-    def __init__(self, prog, out=None, aliases=False, rst_levels=_rst_levels):
-        """Create a new ArgparseRstWriter.
+    def __init__(
+        self,
+        prog: str,
+        out: IO = sys.stdout,
+        aliases: bool = False,
+        rst_levels: Sequence[str] = _rst_levels,
+    ) -> None:
+        """Initialize a new ArgparseRstWriter instance.
 
-        Parameters:
-            prog (str): program name
-            out (file object): file to write to
-            aliases (bool): whether or not to include subparsers for aliases
-            rst_levels (list of str): list of characters
-                for rst section headings
+        Args:
+            prog: Program name.
+            out: File object to write to.
+            aliases: Whether or not to include subparsers for aliases.
+            rst_levels: List of characters for rst section headings.
         """
-        out = sys.stdout if out is None else out
-        super(ArgparseRstWriter, self).__init__(prog, out, aliases)
+        super().__init__(prog, out, aliases)
         self.rst_levels = rst_levels
 
-    def format(self, cmd):
+    def format(self, cmd: Command) -> str:
+        """Return the string representation of a single node in the parser tree.
+
+        Args:
+            cmd: Parsed information about a command or subcommand.
+
+        Returns:
+            String representation of a node.
+        """
         string = io.StringIO()
         string.write(self.begin_command(cmd.prog))
 
@@ -205,7 +220,15 @@ def format(self, cmd):
 
         return string.getvalue()
 
-    def begin_command(self, prog):
+    def begin_command(self, prog: str) -> str:
+        """Text to print before a command.
+
+        Args:
+            prog: Program name.
+
+        Returns:
+            Text before a command.
+        """
         return """
 ----
 
@@ -218,10 +241,26 @@ def begin_command(self, prog):
             prog.replace(" ", "-"), prog, self.rst_levels[self.level] * len(prog)
         )
 
-    def description(self, description):
+    def description(self, description: str) -> str:
+        """Description of a command.
+
+        Args:
+            description: Command description.
+
+        Returns:
+            Description of a command.
+        """
         return description + "\n\n"
 
-    def usage(self, usage):
+    def usage(self, usage: str) -> str:
+        """Example usage of a command.
+
+        Args:
+            usage: Command usage.
+
+        Returns:
+            Usage of a command.
+        """
         return """\
 .. code-block:: console
 
@@ -231,10 +270,24 @@ def usage(self, usage):
             usage
         )
 
-    def begin_positionals(self):
+    def begin_positionals(self) -> str:
+        """Text to print before positional arguments.
+
+        Returns:
+            Positional arguments header.
+        """
         return "\n**Positional arguments**\n\n"
 
-    def positional(self, name, help):
+    def positional(self, name: str, help: str) -> str:
+        """Description of a positional argument.
+
+        Args:
+            name: Argument name.
+            help: Help text.
+
+        Returns:
+            Positional argument description.
+        """
         return """\
 {0}
   {1}
@@ -243,13 +296,32 @@ def positional(self, name, help):
             name, help
         )
 
-    def end_positionals(self):
+    def end_positionals(self) -> str:
+        """Text to print after positional arguments.
+
+        Returns:
+            Positional arguments footer.
+        """
         return ""
 
-    def begin_optionals(self):
+    def begin_optionals(self) -> str:
+        """Text to print before optional arguments.
+
+        Returns:
+            Optional arguments header.
+        """
         return "\n**Optional arguments**\n\n"
 
-    def optional(self, opts, help):
+    def optional(self, opts: str, help: str) -> str:
+        """Description of an optional argument.
+
+        Args:
+            opts: Optional argument.
+            help: Help text.
+
+        Returns:
+            Optional argument description.
+        """
         return """\
 ``{0}``
   {1}
@@ -258,10 +330,23 @@ def optional(self, opts, help):
             opts, help
         )
 
-    def end_optionals(self):
+    def end_optionals(self) -> str:
+        """Text to print after optional arguments.
+
+        Returns:
+            Optional arguments footer.
+        """
         return ""
 
-    def begin_subcommands(self, subcommands):
+    def begin_subcommands(self, subcommands: Sequence[Tuple[ArgumentParser, str]]) -> str:
+        """Table with links to other subcommands.
+
+        Arguments:
+            subcommands: List of subcommands.
+
+        Returns:
+            Subcommand linking text.
+        """
         string = """
 **Subcommands**
 
@@ -280,29 +365,25 @@ def begin_subcommands(self, subcommands):
 class ArgparseCompletionWriter(ArgparseWriter):
     """Write argparse output as shell programmable tab completion functions."""
 
-    def format(self, cmd):
-        """Returns the string representation of a single node in the
-        parser tree.
+    def format(self, cmd: Command) -> str:
+        """Return the string representation of a single node in the parser tree.
 
-        Override this in subclasses to define how each subcommand
-        should be displayed.
-
-        Parameters:
-            (Command): parsed information about a command or subcommand
+        Args:
+            cmd: Parsed information about a command or subcommand.
 
         Returns:
-            str: the string representation of this subcommand
+            String representation of this subcommand.
         """
 
         assert cmd.optionals  # we should always at least have -h, --help
         assert not (cmd.positionals and cmd.subcommands)  # one or the other
 
         # We only care about the arguments/flags, not the help messages
-        positionals = []
+        positionals: Tuple[str, ...] = ()
         if cmd.positionals:
             positionals, _ = zip(*cmd.positionals)
         optionals, _, _ = zip(*cmd.optionals)
-        subcommands = []
+        subcommands: Tuple[str, ...] = ()
         if cmd.subcommands:
             _, subcommands = zip(*cmd.subcommands)
 
@@ -315,71 +396,73 @@ def format(self, cmd):
             + self.end_function(cmd.prog)
         )
 
-    def start_function(self, prog):
-        """Returns the syntax needed to begin a function definition.
+    def start_function(self, prog: str) -> str:
+        """Return the syntax needed to begin a function definition.
 
-        Parameters:
-            prog (str): the command name
+        Args:
+            prog: Program name.
 
         Returns:
-            str: the function definition beginning
+            Function definition beginning.
         """
         name = prog.replace("-", "_").replace(" ", "_")
         return "\n_{0}() {{".format(name)
 
-    def end_function(self, prog=None):
-        """Returns the syntax needed to end a function definition.
+    def end_function(self, prog: str) -> str:
+        """Return the syntax needed to end a function definition.
 
-        Parameters:
-            prog (str or None): the command name
+        Args:
+            prog: Program name
 
         Returns:
-            str: the function definition ending
+            Function definition ending.
         """
         return "}\n"
 
-    def body(self, positionals, optionals, subcommands):
-        """Returns the body of the function.
+    def body(
+        self, positionals: Sequence[str], optionals: Sequence[str], subcommands: Sequence[str]
+    ) -> str:
+        """Return the body of the function.
 
-        Parameters:
-            positionals (list): list of positional arguments
-            optionals (list): list of optional arguments
-            subcommands (list): list of subcommand parsers
+        Args:
+            positionals: List of positional arguments.
+            optionals: List of optional arguments.
+            subcommands: List of subcommand parsers.
 
         Returns:
-            str: the function body
+            Function body.
         """
         return ""
 
-    def positionals(self, positionals):
-        """Returns the syntax for reporting positional arguments.
+    def positionals(self, positionals: Sequence[str]) -> str:
+        """Return the syntax for reporting positional arguments.
 
-        Parameters:
-            positionals (list): list of positional arguments
+        Args:
+            positionals: List of positional arguments.
 
         Returns:
-            str: the syntax for positional arguments
+            Syntax for positional arguments.
         """
         return ""
 
-    def optionals(self, optionals):
-        """Returns the syntax for reporting optional flags.
+    def optionals(self, optionals: Sequence[str]) -> str:
+        """Return the syntax for reporting optional flags.
 
-        Parameters:
-            optionals (list): list of optional arguments
+        Args:
+            optionals: List of optional arguments.
 
         Returns:
-            str: the syntax for optional flags
+            Syntax for optional flags.
         """
         return ""
 
-    def subcommands(self, subcommands):
-        """Returns the syntax for reporting subcommands.
+    def subcommands(self, subcommands: Sequence[str]) -> str:
+        """Return the syntax for reporting subcommands.
 
-        Parameters:
-            subcommands (list): list of subcommand parsers
+        Args:
+            subcommands: List of subcommand parsers.
 
         Returns:
-            str: the syntax for subcommand parsers
+            Syntax for subcommand parsers
         """
         return ""

lib/spack/llnl/util/filesystem.py

@@ -402,7 +402,7 @@ def groupid_to_group(x):
                 os.remove(backup_filename)
 
 
-class FileFilter(object):
+class FileFilter:
     """Convenience class for calling ``filter_file`` a lot."""
 
     def __init__(self, *filenames):
@@ -610,6 +610,8 @@ def chgrp(path, group, follow_symlinks=True):
         gid = grp.getgrnam(group).gr_gid
     else:
         gid = group
+    if os.stat(path).st_gid == gid:
+        return
     if follow_symlinks:
         os.chown(path, -1, gid)
     else:
@@ -1336,7 +1338,7 @@ def lexists_islink_isdir(path):
     return True, is_link, is_dir
 
 
-class BaseDirectoryVisitor(object):
+class BaseDirectoryVisitor:
     """Base class and interface for :py:func:`visit_directory_tree`."""
 
     def visit_file(self, root, rel_path, depth):
@@ -1890,7 +1892,7 @@ class HeaderList(FileList):
     include_regex = re.compile(r"(.*?)(\binclude\b)(.*)")
 
     def __init__(self, files):
-        super(HeaderList, self).__init__(files)
+        super().__init__(files)
 
         self._macro_definitions = []
         self._directories = None
@@ -1916,7 +1918,7 @@ def _default_directories(self):
         """Default computation of directories based on the list of
         header files.
         """
-        dir_list = super(HeaderList, self).directories
+        dir_list = super().directories
         values = []
         for d in dir_list:
             # If the path contains a subdirectory named 'include' then stop
@@ -2352,7 +2354,7 @@ def find_all_libraries(root, recursive=False):
     )
 
 
-class WindowsSimulatedRPath(object):
+class WindowsSimulatedRPath:
     """Class representing Windows filesystem rpath analog
 
     One instance of this class is associated with a package (only on Windows)

lib/spack/llnl/util/lang.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import division
-
 import collections.abc
 import contextlib
 import functools
@@ -768,10 +766,10 @@ def pretty_seconds(seconds):
 
 class RequiredAttributeError(ValueError):
     def __init__(self, message):
-        super(RequiredAttributeError, self).__init__(message)
+        super().__init__(message)
 
 
-class ObjectWrapper(object):
+class ObjectWrapper:
     """Base class that wraps an object. Derived classes can add new behavior
     while staying undercover.
 
@@ -798,7 +796,7 @@ def __init__(self, wrapped_object):
         self.__dict__ = wrapped_object.__dict__
 
 
-class Singleton(object):
+class Singleton:
     """Simple wrapper for lazily initialized singleton objects."""
 
     def __init__(self, factory):
@@ -845,7 +843,7 @@ def __repr__(self):
         return repr(self.instance)
 
 
-class LazyReference(object):
+class LazyReference:
     """Lazily evaluated reference to part of a singleton."""
 
     def __init__(self, ref_function):
@@ -943,7 +941,7 @@ def _wrapper(args):
     return _wrapper
 
 
-class Devnull(object):
+class Devnull:
     """Null stream with less overhead than ``os.devnull``.
 
     See https://stackoverflow.com/a/2929954.
@@ -1060,7 +1058,7 @@ def __str__(self):
         return str(self.data)
 
 
-class GroupedExceptionHandler(object):
+class GroupedExceptionHandler:
     """A generic mechanism to coalesce multiple exceptions and preserve tracebacks."""
 
     def __init__(self):
@@ -1091,7 +1089,7 @@ def grouped_message(self, with_tracebacks: bool = True) -> str:
         return "due to the following failures:\n{0}".format("\n".join(each_exception_message))
 
 
-class GroupedExceptionForwarder(object):
+class GroupedExceptionForwarder:
     """A contextmanager to capture exceptions and forward them to a
     GroupedExceptionHandler."""
 
@@ -1111,7 +1109,7 @@ def __exit__(self, exc_type, exc_value, tb):
         return True
 
 
-class classproperty(object):
+class classproperty:
     """Non-data descriptor to evaluate a class-level property. The function that performs
     the evaluation is injected at creation time and take an instance (could be None) and
     an owner (i.e. the class that originated the instance)

lib/spack/llnl/util/link_tree.py

@@ -5,8 +5,6 @@
 
 """LinkTree class for setting up trees of symbolic links."""
 
-from __future__ import print_function
-
 import filecmp
 import os
 import shutil
@@ -287,7 +285,7 @@ def visit_symlinked_file(self, root, rel_path, depth):
         self.visit_file(root, rel_path, depth)
 
 
-class LinkTree(object):
+class LinkTree:
     """Class to create trees of symbolic links from a source directory.
 
     LinkTree objects are constructed with a source root.  Their
@@ -432,12 +430,12 @@ class MergeConflictError(Exception):
 
 class ConflictingSpecsError(MergeConflictError):
     def __init__(self, spec_1, spec_2):
-        super(MergeConflictError, self).__init__(spec_1, spec_2)
+        super().__init__(spec_1, spec_2)
 
 
 class SingleMergeConflictError(MergeConflictError):
     def __init__(self, path):
-        super(MergeConflictError, self).__init__("Package merge blocked by file: %s" % path)
+        super().__init__("Package merge blocked by file: %s" % path)
 
 
 class MergeConflictSummary(MergeConflictError):
@@ -452,4 +450,4 @@ def __init__(self, conflicts):
             msg += "\n    `{0}` and `{1}` both project to `{2}`".format(
                 conflict.src_a, conflict.src_b, conflict.dst
             )
-        super(MergeConflictSummary, self).__init__(msg)
+        super().__init__(msg)

lib/spack/llnl/util/lock.py

@@ -39,7 +39,7 @@
 true_fn = lambda: True
 
 
-class OpenFile(object):
+class OpenFile:
     """Record for keeping track of open lockfiles (with reference counting).
 
     There's really only one ``OpenFile`` per inode, per process, but we record the
@@ -53,7 +53,7 @@ def __init__(self, fh):
         self.refs = 0
 
 
-class OpenFileTracker(object):
+class OpenFileTracker:
     """Track open lockfiles, to minimize number of open file descriptors.
 
     The ``fcntl`` locks that Spack uses are associated with an inode and a process.
@@ -169,7 +169,7 @@ def _attempts_str(wait_time, nattempts):
     return " after {} and {}".format(pretty_seconds(wait_time), attempts)
 
 
-class LockType(object):
+class LockType:
     READ = 0
     WRITE = 1
 
@@ -192,7 +192,7 @@ def is_valid(op):
         return op == LockType.READ or op == LockType.WRITE
 
 
-class Lock(object):
+class Lock:
     """This is an implementation of a filesystem lock using Python's lockf.
 
     In Python, ``lockf`` actually calls ``fcntl``, so this should work with
@@ -681,7 +681,7 @@ def _status_msg(self, locktype, status):
         )
 
 
-class LockTransaction(object):
+class LockTransaction:
     """Simple nested transaction context manager that uses a file lock.
 
     Arguments:
@@ -770,7 +770,7 @@ class LockDowngradeError(LockError):
 
     def __init__(self, path):
         msg = "Cannot downgrade lock from write to read on file: %s" % path
-        super(LockDowngradeError, self).__init__(msg)
+        super().__init__(msg)
 
 
 class LockLimitError(LockError):
@@ -782,7 +782,7 @@ class LockTimeoutError(LockError):
 
     def __init__(self, lock_type, path, time, attempts):
         fmt = "Timed out waiting for a {} lock after {}.\n    Made {} {} on file: {}"
-        super(LockTimeoutError, self).__init__(
+        super().__init__(
             fmt.format(
                 lock_type,
                 pretty_seconds(time),
@@ -798,7 +798,7 @@ class LockUpgradeError(LockError):
 
     def __init__(self, path):
         msg = "Cannot upgrade lock from read to write on file: %s" % path
-        super(LockUpgradeError, self).__init__(msg)
+        super().__init__(msg)
 
 
 class LockPermissionError(LockError):
@@ -810,7 +810,7 @@ class LockROFileError(LockPermissionError):
 
     def __init__(self, path):
         msg = "Can't take write lock on read-only file: %s" % path
-        super(LockROFileError, self).__init__(msg)
+        super().__init__(msg)
 
 
 class CantCreateLockError(LockPermissionError):
@@ -819,4 +819,4 @@ class CantCreateLockError(LockPermissionError):
     def __init__(self, path):
         msg = "cannot create lock '%s': " % path
         msg += "file does not exist and location is not writable"
-        super(LockError, self).__init__(msg)
+        super().__init__(msg)

lib/spack/llnl/util/tty/__init__.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import unicode_literals
-
 import contextlib
 import io
 import os

lib/spack/llnl/util/tty/colify.py

@@ -6,8 +6,6 @@
 """
 Routines for printing columnar output.  See ``colify()`` for more information.
 """
-from __future__ import division, unicode_literals
-
 import io
 import os
 import sys

lib/spack/llnl/util/tty/color.py

@@ -59,8 +59,6 @@
 
 To output an @, use '@@'.  To output a } inside braces, use '}}'.
 """
-from __future__ import unicode_literals
-
 import re
 import sys
 from contextlib import contextmanager
@@ -70,7 +68,7 @@ class ColorParseError(Exception):
     """Raised when a color format fails to parse."""
 
     def __init__(self, message):
-        super(ColorParseError, self).__init__(message)
+        super().__init__(message)
 
 
 # Text styles for ansi codes
@@ -205,7 +203,7 @@ def color_when(value):
     set_color_when(old_value)
 
 
-class match_to_ansi(object):
+class match_to_ansi:
     def __init__(self, color=True, enclose=False):
         self.color = _color_when_value(color)
         self.enclose = enclose
@@ -321,7 +319,7 @@ def cescape(string):
     return string
 
 
-class ColorStream(object):
+class ColorStream:
     def __init__(self, stream, color=None):
         self._stream = stream
         self._color = color

lib/spack/llnl/util/tty/log.py

@@ -5,8 +5,6 @@
 
 """Utility classes for logging the output of blocks of code.
 """
-from __future__ import unicode_literals
-
 import atexit
 import ctypes
 import errno
@@ -67,7 +65,7 @@ def _strip(line):
     return _escape.sub("", line)
 
 
-class keyboard_input(object):
+class keyboard_input:
     """Context manager to disable line editing and echoing.
 
     Use this with ``sys.stdin`` for keyboard input, e.g.::
@@ -244,7 +242,7 @@ def __exit__(self, exc_type, exception, traceback):
                 signal.signal(signum, old_handler)
 
 
-class Unbuffered(object):
+class Unbuffered:
     """Wrapper for Python streams that forces them to be unbuffered.
 
     This is implemented by forcing a flush after each write.
@@ -289,7 +287,7 @@ def _file_descriptors_work(*streams):
         return False
 
 
-class FileWrapper(object):
+class FileWrapper:
     """Represents a file. Can be an open stream, a path to a file (not opened
     yet), or neither. When unwrapped, it returns an open file (or file-like)
     object.
@@ -331,7 +329,7 @@ def close(self):
             self.file.close()
 
 
-class MultiProcessFd(object):
+class MultiProcessFd:
     """Return an object which stores a file descriptor and can be passed as an
     argument to a function run with ``multiprocessing.Process``, such that
     the file descriptor is available in the subprocess."""
@@ -431,7 +429,7 @@ def log_output(*args, **kwargs):
         return nixlog(*args, **kwargs)
 
 
-class nixlog(object):
+class nixlog:
     """
     Under the hood, we spawn a daemon and set up a pipe between this
     process and the daemon.  The daemon writes our output to both the
@@ -752,7 +750,7 @@ def close(self):
                 os.close(self.saved_stream)
 
 
-class winlog(object):
+class winlog:
     """
     Similar to nixlog, with underlying
     functionality ported to support Windows.

lib/spack/llnl/util/tty/pty.py

@@ -13,8 +13,6 @@
 
 Note: The functionality in this module is unsupported on Windows
 """
-from __future__ import print_function
-
 import multiprocessing
 import os
 import re
@@ -36,7 +34,7 @@
     pass
 
 
-class ProcessController(object):
+class ProcessController:
     """Wrapper around some fundamental process control operations.
 
     This allows one process (the controller) to drive another (the
@@ -157,7 +155,7 @@ def wait_running(self):
         self.wait(lambda: "T" not in self.proc_status())
 
 
-class PseudoShell(object):
+class PseudoShell:
     """Sets up controller and minion processes with a PTY.
 
     You can create a ``PseudoShell`` if you want to test how some

lib/spack/spack/abi.py

@@ -13,7 +13,7 @@
 from spack.util.executable import Executable, ProcessError
 
 
-class ABI(object):
+class ABI:
     """This class provides methods to test ABI compatibility between specs.
     The current implementation is rather rough and could be improved."""
 

lib/spack/spack/audit.py

@@ -60,7 +60,7 @@ def _search_duplicate_compilers(error_cls):
 GROUPS = collections.defaultdict(list)
 
 
-class Error(object):
+class Error:
     """Information on an error reported in a test."""
 
     def __init__(self, summary, details):

lib/spack/spack/binary_distribution.py

@@ -80,14 +80,14 @@ def __init__(self, errors):
         else:
             err = errors[0]
             self.message = "{0}: {1}".format(err.__class__.__name__, str(err))
-        super(FetchCacheError, self).__init__(self.message)
+        super().__init__(self.message)
 
 
 class ListMirrorSpecsError(spack.error.SpackError):
     """Raised when unable to retrieve list of specs from the mirror"""
 
 
-class BinaryCacheIndex(object):
+class BinaryCacheIndex:
     """
     The BinaryCacheIndex tracks what specs are available on (usually remote)
     binary caches.
@@ -517,9 +517,7 @@ class NoOverwriteException(spack.error.SpackError):
     """Raised when a file would be overwritten"""
 
     def __init__(self, file_path):
-        super(NoOverwriteException, self).__init__(
-            f"Refusing to overwrite the following file: {file_path}"
-        )
+        super().__init__(f"Refusing to overwrite the following file: {file_path}")
 
 
 class NoGpgException(spack.error.SpackError):
@@ -528,7 +526,7 @@ class NoGpgException(spack.error.SpackError):
     """
 
     def __init__(self, msg):
-        super(NoGpgException, self).__init__(msg)
+        super().__init__(msg)
 
 
 class NoKeyException(spack.error.SpackError):
@@ -537,7 +535,7 @@ class NoKeyException(spack.error.SpackError):
     """
 
     def __init__(self, msg):
-        super(NoKeyException, self).__init__(msg)
+        super().__init__(msg)
 
 
 class PickKeyException(spack.error.SpackError):
@@ -548,7 +546,7 @@ class PickKeyException(spack.error.SpackError):
     def __init__(self, keys):
         err_msg = "Multiple keys available for signing\n%s\n" % keys
         err_msg += "Use spack buildcache create -k <key hash> to pick a key."
-        super(PickKeyException, self).__init__(err_msg)
+        super().__init__(err_msg)
 
 
 class NoVerifyException(spack.error.SpackError):
@@ -565,7 +563,7 @@ class NoChecksumException(spack.error.SpackError):
     """
 
     def __init__(self, path, size, contents, algorithm, expected, computed):
-        super(NoChecksumException, self).__init__(
+        super().__init__(
             f"{algorithm} checksum failed for {path}",
             f"Expected {expected} but got {computed}. "
             f"File size = {size} bytes. Contents = {contents!r}",
@@ -578,7 +576,7 @@ class NewLayoutException(spack.error.SpackError):
     """
 
     def __init__(self, msg):
-        super(NewLayoutException, self).__init__(msg)
+        super().__init__(msg)
 
 
 class UnsignedPackageException(spack.error.SpackError):
@@ -760,13 +758,12 @@ def hashes_to_prefixes(spec):
     }
 
 
-def get_buildinfo_dict(spec, rel=False):
+def get_buildinfo_dict(spec):
     """Create metadata for a tarball"""
     manifest = get_buildfile_manifest(spec)
 
     return {
         "sbang_install_path": spack.hooks.sbang.sbang_install_path(),
-        "relative_rpaths": rel,
         "buildpath": spack.store.layout.root,
         "spackprefix": spack.paths.prefix,
         "relative_prefix": os.path.relpath(spec.prefix, spack.store.layout.root),
@@ -1209,9 +1206,6 @@ class PushOptions(NamedTuple):
     #: Overwrite existing tarball/metadata files in buildcache
     force: bool = False
 
-    #: Whether to use relative RPATHs
-    relative: bool = False
-
     #: Allow absolute paths to package prefixes when creating a tarball
     allow_root: bool = False
 
@@ -1281,41 +1275,17 @@ def _build_tarball_in_stage_dir(spec: Spec, out_url: str, stage_dir: str, option
         raise NoOverwriteException(url_util.format(remote_specfile_path))
 
     pkg_dir = os.path.basename(spec.prefix.rstrip(os.path.sep))
-    workdir = os.path.join(stage_dir, pkg_dir)
 
-    # TODO: We generally don't want to mutate any files, but when using relative
-    # mode, Spack unfortunately *does* mutate rpaths and links ahead of time.
-    # For now, we only make a full copy of the spec prefix when in relative mode.
-
-    if options.relative:
-        # tarfile is used because it preserves hardlink etc best.
-        binaries_dir = workdir
-        temp_tarfile_name = tarball_name(spec, ".tar")
-        temp_tarfile_path = os.path.join(tarfile_dir, temp_tarfile_name)
-        with closing(tarfile.open(temp_tarfile_path, "w")) as tar:
-            tar.add(name="%s" % spec.prefix, arcname=".")
-        with closing(tarfile.open(temp_tarfile_path, "r")) as tar:
-            tar.extractall(workdir)
-        os.remove(temp_tarfile_path)
-    else:
-        binaries_dir = spec.prefix
+    binaries_dir = spec.prefix
 
     # create info for later relocation and create tar
-    buildinfo = get_buildinfo_dict(spec, options.relative)
+    buildinfo = get_buildinfo_dict(spec)
 
-    # optionally make the paths in the binaries relative to each other
-    # in the spack install tree before creating tarball
-    if options.relative:
-        make_package_relative(workdir, spec, buildinfo, options.allow_root)
-    elif not options.allow_root:
+    if not options.allow_root:
         ensure_package_relocatable(buildinfo, binaries_dir)
 
     _do_create_tarball(tarfile_path, binaries_dir, pkg_dir, buildinfo)
 
-    # remove copy of install directory
-    if options.relative:
-        shutil.rmtree(workdir)
-
     # get the sha256 checksum of the tarball
     checksum = checksum_tarball(tarfile_path)
 
@@ -1336,7 +1306,6 @@ def _build_tarball_in_stage_dir(spec: Spec, out_url: str, stage_dir: str, option
     # This will be used to determine is the directory layout has changed.
     buildinfo = {}
     buildinfo["relative_prefix"] = os.path.relpath(spec.prefix, spack.store.layout.root)
-    buildinfo["relative_rpaths"] = options.relative
     spec_dict["buildinfo"] = buildinfo
 
     with open(specfile_path, "w") as outfile:
@@ -1596,35 +1565,6 @@ def download_tarball(spec, unsigned=False, mirrors_for_spec=None):
     return None
 
 
-def make_package_relative(workdir, spec, buildinfo, allow_root):
-    """
-    Change paths in binaries to relative paths. Change absolute symlinks
-    to relative symlinks.
-    """
-    prefix = spec.prefix
-    old_layout_root = buildinfo["buildpath"]
-    orig_path_names = list()
-    cur_path_names = list()
-    for filename in buildinfo["relocate_binaries"]:
-        orig_path_names.append(os.path.join(prefix, filename))
-        cur_path_names.append(os.path.join(workdir, filename))
-
-    platform = spack.platforms.by_name(spec.platform)
-    if "macho" in platform.binary_formats:
-        relocate.make_macho_binaries_relative(cur_path_names, orig_path_names, old_layout_root)
-
-    if "elf" in platform.binary_formats:
-        relocate.make_elf_binaries_relative(cur_path_names, orig_path_names, old_layout_root)
-
-    allow_root or relocate.ensure_binaries_are_relocatable(cur_path_names)
-    orig_path_names = list()
-    cur_path_names = list()
-    for linkname in buildinfo.get("relocate_links", []):
-        orig_path_names.append(os.path.join(prefix, linkname))
-        cur_path_names.append(os.path.join(workdir, linkname))
-    relocate.make_link_relative(cur_path_names, orig_path_names)
-
-
 def ensure_package_relocatable(buildinfo, binaries_dir):
     """Check if package binaries are relocatable."""
     binaries = [os.path.join(binaries_dir, f) for f in buildinfo["relocate_binaries"]]
@@ -2395,7 +2335,7 @@ def download_single_spec(concrete_spec, destination, mirror_url=None):
     return download_buildcache_entry(files_to_fetch, mirror_url)
 
 
-class BinaryCacheQuery(object):
+class BinaryCacheQuery:
     """Callable object to query if a spec is in a binary cache"""
 
     def __init__(self, all_architectures):

lib/spack/spack/bootstrap/environment.py

@@ -175,12 +175,12 @@ def black_root_spec() -> str:
 
 def flake8_root_spec() -> str:
     """Return the root spec used to bootstrap flake8"""
-    return _root_spec("py-flake8")
+    return _root_spec("py-flake8@3.8.2:")
 
 
 def pytest_root_spec() -> str:
     """Return the root spec used to bootstrap flake8"""
-    return _root_spec("py-pytest")
+    return _root_spec("py-pytest@6.2.4:")
 
 
 def ensure_environment_dependencies() -> None:

lib/spack/spack/build_environment.py

@@ -148,7 +148,7 @@ class MakeExecutable(Executable):
 
     def __init__(self, name, jobs, **kwargs):
         supports_jobserver = kwargs.pop("supports_jobserver", True)
-        super(MakeExecutable, self).__init__(name, **kwargs)
+        super().__init__(name, **kwargs)
         self.supports_jobserver = supports_jobserver
         self.jobs = jobs
 
@@ -175,7 +175,7 @@ def __call__(self, *args, **kwargs):
             if jobs_env_jobs is not None:
                 kwargs["extra_env"] = {jobs_env: str(jobs_env_jobs)}
 
-        return super(MakeExecutable, self).__call__(*args, **kwargs)
+        return super().__call__(*args, **kwargs)
 
 
 def _on_cray():
@@ -1332,7 +1332,7 @@ class ChildError(InstallError):
     build_errors = [("spack.util.executable", "ProcessError")]
 
     def __init__(self, msg, module, classname, traceback_string, log_name, log_type, context):
-        super(ChildError, self).__init__(msg)
+        super().__init__(msg)
         self.module = module
         self.name = classname
         self.traceback = traceback_string

lib/spack/spack/build_systems/cached_cmake.py

@@ -289,6 +289,7 @@ def std_initconfig_entries(self):
             "# CMake executable path: {0}".format(self.pkg.spec["cmake"].command.path),
             "#------------------{0}\n".format("-" * 60),
             cmake_cache_path("CMAKE_PREFIX_PATH", cmake_prefix_path),
+            self.define_cmake_cache_from_variant("CMAKE_BUILD_TYPE", "build_type"),
         ]
 
     def initconfig_package_entries(self):
@@ -311,7 +312,7 @@ def initconfig(self, pkg, spec, prefix):
 
     @property
     def std_cmake_args(self):
-        args = super(CachedCMakeBuilder, self).std_cmake_args
+        args = super().std_cmake_args
         args.extend(["-C", self.cache_path])
         return args
 

lib/spack/spack/build_systems/cuda.py

@@ -102,11 +102,10 @@ def cuda_flags(arch_list):
 
     depends_on("cuda@11.0:", when="cuda_arch=80")
     depends_on("cuda@11.1:", when="cuda_arch=86")
-
     depends_on("cuda@11.4:", when="cuda_arch=87")
-
     depends_on("cuda@11.8:", when="cuda_arch=89")
-    depends_on("cuda@11.8:", when="cuda_arch=90")
+
+    depends_on("cuda@12.0:", when="cuda_arch=90")
 
     # From the NVIDIA install guide we know of conflicts for particular
     # platforms (linux, darwin), architectures (x86, powerpc) and compilers

lib/spack/spack/build_systems/oneapi.py

@@ -121,7 +121,7 @@ def setup_run_environment(self, env):
            $ source {prefix}/{component}/{version}/env/vars.sh
         """
         # Only if environment modifications are desired (default is +envmods)
-        if "+envmods" in self.spec:
+        if "~envmods" not in self.spec:
             env.extend(
                 EnvironmentModifications.from_sourcing_file(
                     join_path(self.component_prefix, "env", "vars.sh")
@@ -175,7 +175,7 @@ def libs(self):
         return find_libraries("*", root=lib_path, shared=True, recursive=True)
 
 
-class IntelOneApiStaticLibraryList(object):
+class IntelOneApiStaticLibraryList:
     """Provides ld_flags when static linking is needed
 
     Oneapi puts static and dynamic libraries in the same directory, so

lib/spack/spack/build_systems/python.py

@@ -23,6 +23,7 @@
 import spack.store
 from spack.directives import build_system, depends_on, extends, maintainers
 from spack.error import NoHeadersError, NoLibrariesError, SpecError
+from spack.install_test import test_part
 from spack.version import Version
 
 from ._checks import BaseBuilder, execute_install_time_tests
@@ -167,18 +168,65 @@ def remove_files_from_view(self, view, merge_map):
 
         view.remove_files(to_remove)
 
-    def test(self):
+    def test_imports(self):
         """Attempts to import modules of the installed package."""
 
         # Make sure we are importing the installed modules,
         # not the ones in the source directory
+        python = inspect.getmodule(self).python.path
         for module in self.import_modules:
-            self.run_test(
-                inspect.getmodule(self).python.path,
-                ["-c", "import {0}".format(module)],
-                purpose="checking import of {0}".format(module),
+            with test_part(
+                self,
+                f"test_imports_{module}",
+                purpose=f"checking import of {module}",
                 work_dir="spack-test",
-            )
+            ):
+                python("-c", f"import {module}")
+
+    def update_external_dependencies(self, extendee_spec=None):
+        """
+        Ensure all external python packages have a python dependency
+
+        If another package in the DAG depends on python, we use that
+        python for the dependency of the external. If not, we assume
+        that the external PythonPackage is installed into the same
+        directory as the python it depends on.
+        """
+        # TODO: Include this in the solve, rather than instantiating post-concretization
+        if "python" not in self.spec:
+            if extendee_spec:
+                python = extendee_spec
+            elif "python" in self.spec.root:
+                python = self.spec.root["python"]
+            else:
+                python = self.get_external_python_for_prefix()
+                if not python.concrete:
+                    repo = spack.repo.path.repo_for_pkg(python)
+                    python.namespace = repo.namespace
+
+                    # Ensure architecture information is present
+                    if not python.architecture:
+                        host_platform = spack.platforms.host()
+                        host_os = host_platform.operating_system("default_os")
+                        host_target = host_platform.target("default_target")
+                        python.architecture = spack.spec.ArchSpec(
+                            (str(host_platform), str(host_os), str(host_target))
+                        )
+                    else:
+                        if not python.architecture.platform:
+                            python.architecture.platform = spack.platforms.host()
+                        if not python.architecture.os:
+                            python.architecture.os = "default_os"
+                        if not python.architecture.target:
+                            python.architecture.target = archspec.cpu.host().family.name
+
+                    # Ensure compiler information is present
+                    if not python.compiler:
+                        python.compiler = self.spec.compiler
+
+                    python.external_path = self.spec.external_path
+                    python._mark_concrete()
+            self.spec.add_dependency_edge(python, deptypes=("build", "link", "run"), virtuals=())
 
 
 class PythonPackage(PythonExtension):
@@ -225,51 +273,6 @@ def list_url(cls):
             name = cls.pypi.split("/")[0]
             return "https://pypi.org/simple/" + name + "/"
 
-    def update_external_dependencies(self, extendee_spec=None):
-        """
-        Ensure all external python packages have a python dependency
-
-        If another package in the DAG depends on python, we use that
-        python for the dependency of the external. If not, we assume
-        that the external PythonPackage is installed into the same
-        directory as the python it depends on.
-        """
-        # TODO: Include this in the solve, rather than instantiating post-concretization
-        if "python" not in self.spec:
-            if extendee_spec:
-                python = extendee_spec
-            elif "python" in self.spec.root:
-                python = self.spec.root["python"]
-            else:
-                python = self.get_external_python_for_prefix()
-                if not python.concrete:
-                    repo = spack.repo.path.repo_for_pkg(python)
-                    python.namespace = repo.namespace
-
-                    # Ensure architecture information is present
-                    if not python.architecture:
-                        host_platform = spack.platforms.host()
-                        host_os = host_platform.operating_system("default_os")
-                        host_target = host_platform.target("default_target")
-                        python.architecture = spack.spec.ArchSpec(
-                            (str(host_platform), str(host_os), str(host_target))
-                        )
-                    else:
-                        if not python.architecture.platform:
-                            python.architecture.platform = spack.platforms.host()
-                        if not python.architecture.os:
-                            python.architecture.os = "default_os"
-                        if not python.architecture.target:
-                            python.architecture.target = archspec.cpu.host().family.name
-
-                    # Ensure compiler information is present
-                    if not python.compiler:
-                        python.compiler = self.spec.compiler
-
-                    python.external_path = self.spec.external_path
-                    python._mark_concrete()
-            self.spec.add_dependency_edge(python, deptypes=("build", "link", "run"))
-
     def get_external_python_for_prefix(self):
         """
         For an external package that extends python, find the most likely spec for the python

lib/spack/spack/builder.py

@@ -63,7 +63,7 @@ def create(pkg):
     return _BUILDERS[id(pkg)]
 
 
-class _PhaseAdapter(object):
+class _PhaseAdapter:
     def __init__(self, builder, phase_fn):
         self.builder = builder
         self.phase_fn = phase_fn
@@ -115,7 +115,7 @@ class hierarchy (look at AspellDictPackage for an example of that)
     # package. The semantic should be the same as the method in the base builder were still
     # present in the base class of the package.
 
-    class _ForwardToBaseBuilder(object):
+    class _ForwardToBaseBuilder:
         def __init__(self, wrapped_pkg_object, root_builder):
             self.wrapped_package_object = wrapped_pkg_object
             self.root_builder = root_builder
@@ -188,7 +188,7 @@ def __init__(self, pkg):
             # Attribute containing the package wrapped in dispatcher with a `__getattr__`
             # method that will forward certain calls to the default builder.
             self.pkg_with_dispatcher = _ForwardToBaseBuilder(pkg, root_builder=self)
-            super(Adapter, self).__init__(pkg)
+            super().__init__(pkg)
 
         # These two methods don't follow the (self, spec, prefix) signature of phases nor
         # the (self) signature of methods, so they are added explicitly to avoid using a
@@ -388,7 +388,7 @@ def __new__(mcs, name, bases, attr_dict):
         return super(_PackageAdapterMeta, mcs).__new__(mcs, name, bases, attr_dict)
 
 
-class InstallationPhase(object):
+class InstallationPhase:
     """Manages a single phase of the installation.
 
     This descriptor stores at creation time the name of the method it should
@@ -530,9 +530,9 @@ def setup_build_environment(self, env):
                 modifications to be applied when the package is built. Package authors
                 can call methods on it to alter the build environment.
         """
-        if not hasattr(super(Builder, self), "setup_build_environment"):
+        if not hasattr(super(), "setup_build_environment"):
             return
-        super(Builder, self).setup_build_environment(env)
+        super().setup_build_environment(env)
 
     def setup_dependent_build_environment(self, env, dependent_spec):
         """Sets up the build environment of packages that depend on this one.
@@ -563,9 +563,9 @@ def setup_dependent_build_environment(self, env, dependent_spec):
                 the dependent's state. Note that *this* package's spec is
                 available as ``self.spec``
         """
-        if not hasattr(super(Builder, self), "setup_dependent_build_environment"):
+        if not hasattr(super(), "setup_dependent_build_environment"):
             return
-        super(Builder, self).setup_dependent_build_environment(env, dependent_spec)
+        super().setup_dependent_build_environment(env, dependent_spec)
 
     def __getitem__(self, idx):
         key = self.phases[idx]

lib/spack/spack/caches.py

@@ -58,7 +58,7 @@ def _fetch_cache():
     return spack.fetch_strategy.FsCache(path)
 
 
-class MirrorCache(object):
+class MirrorCache:
     def __init__(self, root, skip_unstable_versions):
         self.root = os.path.abspath(root)
         self.skip_unstable_versions = skip_unstable_versions

lib/spack/spack/ci.py

@@ -28,7 +28,6 @@
 
 import spack
 import spack.binary_distribution as bindist
-import spack.compilers as compilers
 import spack.config as cfg
 import spack.environment as ev
 import spack.main
@@ -58,7 +57,7 @@
 PushResult = namedtuple("PushResult", "success url")
 
 
-class TemporaryDirectory(object):
+class TemporaryDirectory:
     def __init__(self):
         self.temporary_directory = tempfile.mkdtemp()
 
@@ -70,17 +69,10 @@ def __exit__(self, exc_type, exc_value, exc_traceback):
         return False
 
 
-def _is_main_phase(phase_name):
-    return True if phase_name == "specs" else False
-
-
-def get_job_name(phase, strip_compiler, spec, osarch, build_group):
+def get_job_name(spec, osarch, build_group):
     """Given the necessary parts, format the gitlab job name
 
     Arguments:
-        phase (str): Either 'specs' for the main phase, or the name of a
-            bootstrapping phase
-        strip_compiler (bool): Should compiler be stripped from job name
         spec (spack.spec.Spec): Spec job will build
         osarch: Architecture TODO: (this is a spack.spec.ArchSpec,
             but sphinx doesn't recognize the type and fails).
@@ -93,12 +85,7 @@ def get_job_name(phase, strip_compiler, spec, osarch, build_group):
     format_str = ""
     format_args = []
 
-    if phase:
-        format_str += "({{{0}}})".format(item_idx)
-        format_args.append(phase)
-        item_idx += 1
-
-    format_str += " {{{0}}}".format(item_idx)
+    format_str += "{{{0}}}".format(item_idx)
     format_args.append(spec.name)
     item_idx += 1
 
@@ -110,10 +97,9 @@ def get_job_name(phase, strip_compiler, spec, osarch, build_group):
     format_args.append(spec.version)
     item_idx += 1
 
-    if _is_main_phase(phase) is True or strip_compiler is False:
-        format_str += " {{{0}}}".format(item_idx)
-        format_args.append(spec.compiler)
-        item_idx += 1
+    format_str += " {{{0}}}".format(item_idx)
+    format_args.append(spec.compiler)
+    item_idx += 1
 
     format_str += " {{{0}}}".format(item_idx)
     format_args.append(osarch)
@@ -153,49 +139,33 @@ def _add_dependency(spec_label, dep_label, deps):
     deps[spec_label].add(dep_label)
 
 
-def _get_spec_dependencies(
-    specs, deps, spec_labels, check_index_only=False, mirrors_to_check=None
-):
-    spec_deps_obj = _compute_spec_deps(
-        specs, check_index_only=check_index_only, mirrors_to_check=mirrors_to_check
-    )
+def _get_spec_dependencies(specs, deps, spec_labels):
+    spec_deps_obj = _compute_spec_deps(specs)
 
     if spec_deps_obj:
         dependencies = spec_deps_obj["dependencies"]
         specs = spec_deps_obj["specs"]
 
         for entry in specs:
-            spec_labels[entry["label"]] = {
-                "spec": entry["spec"],
-                "needs_rebuild": entry["needs_rebuild"],
-            }
+            spec_labels[entry["label"]] = entry["spec"]
 
         for entry in dependencies:
             _add_dependency(entry["spec"], entry["depends"], deps)
 
 
-def stage_spec_jobs(specs, check_index_only=False, mirrors_to_check=None):
+def stage_spec_jobs(specs):
     """Take a set of release specs and generate a list of "stages", where the
         jobs in any stage are dependent only on jobs in previous stages.  This
         allows us to maximize build parallelism within the gitlab-ci framework.
 
     Arguments:
         specs (Iterable): Specs to build
-        check_index_only (bool): Regardless of whether DAG pruning is enabled,
-            all configured mirrors are searched to see if binaries for specs
-            are up to date on those mirrors.  This flag limits that search to
-            the binary cache indices on those mirrors to speed the process up,
-            even though there is no garantee the index is up to date.
-        mirrors_to_checK: Optional mapping giving mirrors to check instead of
-            any configured mirrors.
 
     Returns: A tuple of information objects describing the specs, dependencies
         and stages:
 
-        spec_labels: A dictionary mapping the spec labels which are made of
-            (pkg-name/hash-prefix), to objects containing "spec" and "needs_rebuild"
-            keys.  The root spec is the spec of which this spec is a dependency
-            and the spec is the formatted spec string for this spec.
+        spec_labels: A dictionary mapping the spec labels (which are formatted
+            as pkg-name/hash-prefix) to concrete specs.
 
         deps: A dictionary where the keys should also have appeared as keys in
             the spec_labels dictionary, and the values are the set of
@@ -224,13 +194,7 @@ def _remove_satisfied_deps(deps, satisfied_list):
     deps = {}
     spec_labels = {}
 
-    _get_spec_dependencies(
-        specs,
-        deps,
-        spec_labels,
-        check_index_only=check_index_only,
-        mirrors_to_check=mirrors_to_check,
-    )
+    _get_spec_dependencies(specs, deps, spec_labels)
 
     # Save the original deps, as we need to return them at the end of the
     # function.  In the while loop below, the "dependencies" variable is
@@ -256,24 +220,36 @@ def _remove_satisfied_deps(deps, satisfied_list):
     return spec_labels, deps, stages
 
 
-def _print_staging_summary(spec_labels, dependencies, stages):
+def _print_staging_summary(spec_labels, stages, mirrors_to_check, rebuild_decisions):
     if not stages:
         return
 
-    tty.msg("  Staging summary ([x] means a job needs rebuilding):")
+    mirrors = spack.mirror.MirrorCollection(mirrors=mirrors_to_check)
+    tty.msg("Checked the following mirrors for binaries:")
+    for m in mirrors.values():
+        tty.msg("  {0}".format(m.fetch_url))
+
+    tty.msg("Staging summary ([x] means a job needs rebuilding):")
     for stage_index, stage in enumerate(stages):
-        tty.msg("    stage {0} ({1} jobs):".format(stage_index, len(stage)))
+        tty.msg("  stage {0} ({1} jobs):".format(stage_index, len(stage)))
 
         for job in sorted(stage):
-            s = spec_labels[job]["spec"]
+            s = spec_labels[job]
+            rebuild = rebuild_decisions[job].rebuild
+            reason = rebuild_decisions[job].reason
+            reason_msg = " ({0})".format(reason) if reason else ""
             tty.msg(
-                "      [{1}] {0} -> {2}".format(
-                    job, "x" if spec_labels[job]["needs_rebuild"] else " ", _get_spec_string(s)
+                "    [{1}] {0} -> {2}{3}".format(
+                    job, "x" if rebuild else " ", _get_spec_string(s), reason_msg
                 )
             )
+            if rebuild_decisions[job].mirrors:
+                tty.msg("          found on the following mirrors:")
+                for murl in rebuild_decisions[job].mirrors:
+                    tty.msg("            {0}".format(murl))
 
 
-def _compute_spec_deps(spec_list, check_index_only=False, mirrors_to_check=None):
+def _compute_spec_deps(spec_list):
     """
     Computes all the dependencies for the spec(s) and generates a JSON
     object which provides both a list of unique spec names as well as a
@@ -337,12 +313,8 @@ def append_dep(s, d):
                 tty.msg("Will not stage external pkg: {0}".format(s))
                 continue
 
-            up_to_date_mirrors = bindist.get_mirrors_for_spec(
-                spec=s, mirrors_to_check=mirrors_to_check, index_only=check_index_only
-            )
-
             skey = _spec_deps_key(s)
-            spec_labels[skey] = {"spec": s, "needs_rebuild": not up_to_date_mirrors}
+            spec_labels[skey] = s
 
             for d in s.dependencies(deptype=all):
                 dkey = _spec_deps_key(d)
@@ -352,14 +324,8 @@ def append_dep(s, d):
 
                 append_dep(skey, dkey)
 
-    for spec_label, spec_holder in spec_labels.items():
-        specs.append(
-            {
-                "label": spec_label,
-                "spec": spec_holder["spec"],
-                "needs_rebuild": spec_holder["needs_rebuild"],
-            }
-        )
+    for spec_label, concrete_spec in spec_labels.items():
+        specs.append({"label": spec_label, "spec": concrete_spec})
 
     deps_json_obj = {"specs": specs, "dependencies": dependencies}
 
@@ -371,26 +337,17 @@ def _spec_matches(spec, match_string):
 
 
 def _format_job_needs(
-    phase_name,
-    strip_compilers,
-    dep_jobs,
-    osname,
-    build_group,
-    prune_dag,
-    stage_spec_dict,
-    enable_artifacts_buildcache,
+    dep_jobs, osname, build_group, prune_dag, rebuild_decisions, enable_artifacts_buildcache
 ):
     needs_list = []
     for dep_job in dep_jobs:
         dep_spec_key = _spec_deps_key(dep_job)
-        dep_spec_info = stage_spec_dict[dep_spec_key]
+        rebuild = rebuild_decisions[dep_spec_key].rebuild
 
-        if not prune_dag or dep_spec_info["needs_rebuild"]:
+        if not prune_dag or rebuild:
             needs_list.append(
                 {
-                    "job": get_job_name(
-                        phase_name, strip_compilers, dep_job, dep_job.architecture, build_group
-                    ),
+                    "job": get_job_name(dep_job, dep_job.architecture, build_group),
                     "artifacts": enable_artifacts_buildcache,
                 }
             )
@@ -490,17 +447,12 @@ def get_spec_filter_list(env, affected_pkgs, dependent_traverse_depth=None):
     return affected_specs
 
 
-def _build_jobs(phases, staged_phases):
-    for phase in phases:
-        phase_name = phase["name"]
-        spec_labels, dependencies, stages = staged_phases[phase_name]
-
-        for stage_jobs in stages:
-            for spec_label in stage_jobs:
-                spec_record = spec_labels[spec_label]
-                release_spec = spec_record["spec"]
-                release_spec_dag_hash = release_spec.dag_hash()
-                yield release_spec, release_spec_dag_hash
+def _build_jobs(spec_labels, stages):
+    for stage_jobs in stages:
+        for spec_label in stage_jobs:
+            release_spec = spec_labels[spec_label]
+            release_spec_dag_hash = release_spec.dag_hash()
+            yield release_spec, release_spec_dag_hash
 
 
 def _noop(x):
@@ -519,14 +471,21 @@ def _unpack_script(script_section, op=_noop):
     return script
 
 
+class RebuildDecision:
+    def __init__(self):
+        self.rebuild = True
+        self.mirrors = []
+        self.reason = ""
+
+
 class SpackCI:
     """Spack CI object used to generate intermediate representation
     used by the CI generator(s).
     """
 
-    def __init__(self, ci_config, phases, staged_phases):
+    def __init__(self, ci_config, spec_labels, stages):
         """Given the information from the ci section of the config
-        and the job phases setup meta data needed for generating Spack
+        and the staged jobs, set up meta data needed for generating Spack
         CI IR.
         """
 
@@ -541,9 +500,6 @@ def __init__(self, ci_config, phases, staged_phases):
             "enable-artifacts-buildcache": self.ci_config.get(
                 "enable-artifacts-buildcache", False
             ),
-            "bootstrap": self.ci_config.get(
-                "bootstrap", []
-            ),  # This is deprecated and should be removed
             "rebuild-index": self.ci_config.get("rebuild-index", True),
             "broken-specs-url": self.ci_config.get("broken-specs-url", None),
             "broken-tests-packages": self.ci_config.get("broken-tests-packages", []),
@@ -551,7 +507,7 @@ def __init__(self, ci_config, phases, staged_phases):
         }
         jobs = self.ir["jobs"]
 
-        for spec, dag_hash in _build_jobs(phases, staged_phases):
+        for spec, dag_hash in _build_jobs(spec_labels, stages):
             jobs[dag_hash] = self.__init_job(spec)
 
         for name in self.named_jobs:
@@ -873,25 +829,6 @@ def generate_gitlab_ci_yaml(
     if "temporary-storage-url-prefix" in ci_config:
         temp_storage_url_prefix = ci_config["temporary-storage-url-prefix"]
 
-    bootstrap_specs = []
-    phases = []
-    if "bootstrap" in ci_config:
-        for phase in ci_config["bootstrap"]:
-            try:
-                phase_name = phase.get("name")
-                strip_compilers = phase.get("compiler-agnostic")
-            except AttributeError:
-                phase_name = phase
-                strip_compilers = False
-            phases.append({"name": phase_name, "strip-compilers": strip_compilers})
-
-            for bs in env.spec_lists[phase_name]:
-                bootstrap_specs.append(
-                    {"spec": bs, "phase-name": phase_name, "strip-compilers": strip_compilers}
-                )
-
-    phases.append({"name": "specs", "strip-compilers": False})
-
     # If a remote mirror override (alternate buildcache destination) was
     # specified, add it here in case it has already built hashes we might
     # generate.
@@ -993,39 +930,13 @@ def generate_gitlab_ci_yaml(
     except bindist.FetchCacheError as e:
         tty.warn(e)
 
-    staged_phases = {}
-    try:
-        for phase in phases:
-            phase_name = phase["name"]
-            if phase_name == "specs":
-                # Anything in the "specs" of the environment are already
-                # concretized by the block at the top of this method, so we
-                # only need to find the concrete versions, and then avoid
-                # re-concretizing them needlessly later on.
-                concrete_phase_specs = [
-                    concrete
-                    for abstract, concrete in env.concretized_specs()
-                    if abstract in env.spec_lists[phase_name]
-                ]
-            else:
-                # Any specs lists in other definitions (but not in the
-                # "specs") of the environment are not yet concretized so we
-                # have to concretize them explicitly here.
-                concrete_phase_specs = env.spec_lists[phase_name]
-                with spack.concretize.disable_compiler_existence_check():
-                    for phase_spec in concrete_phase_specs:
-                        phase_spec.concretize()
-            staged_phases[phase_name] = stage_spec_jobs(
-                concrete_phase_specs,
-                check_index_only=check_index_only,
-                mirrors_to_check=mirrors_to_check,
-            )
-    finally:
-        # Clean up remote mirror override if enabled
-        if remote_mirror_override:
-            spack.mirror.remove("ci_pr_mirror", cfg.default_modify_scope())
-        if spack_pipeline_type == "spack_pull_request":
-            spack.mirror.remove("ci_shared_pr_mirror", cfg.default_modify_scope())
+    spec_labels, dependencies, stages = stage_spec_jobs(
+        [
+            concrete
+            for abstract, concrete in env.concretized_specs()
+            if abstract in env.spec_lists["specs"]
+        ]
+    )
 
     all_job_names = []
     output_object = {}
@@ -1048,276 +959,212 @@ def generate_gitlab_ci_yaml(
         else:
             broken_spec_urls = web_util.list_url(broken_specs_url)
 
-    spack_ci = SpackCI(ci_config, phases, staged_phases)
+    spack_ci = SpackCI(ci_config, spec_labels, stages)
     spack_ci_ir = spack_ci.generate_ir()
 
-    for phase in phases:
-        phase_name = phase["name"]
-        strip_compilers = phase["strip-compilers"]
+    rebuild_decisions = {}
 
-        spec_labels, dependencies, stages = staged_phases[phase_name]
+    for stage_jobs in stages:
+        stage_name = "stage-{0}".format(stage_id)
+        stage_names.append(stage_name)
+        stage_id += 1
 
-        for stage_jobs in stages:
-            stage_name = "stage-{0}".format(stage_id)
-            stage_names.append(stage_name)
-            stage_id += 1
+        for spec_label in stage_jobs:
+            release_spec = spec_labels[spec_label]
+            release_spec_dag_hash = release_spec.dag_hash()
 
-            for spec_label in stage_jobs:
-                spec_record = spec_labels[spec_label]
-                release_spec = spec_record["spec"]
-                release_spec_dag_hash = release_spec.dag_hash()
+            spec_record = RebuildDecision()
+            rebuild_decisions[spec_label] = spec_record
 
-                if prune_untouched_packages:
-                    if release_spec not in affected_specs:
-                        tty.debug(
-                            "Pruning {0}/{1}, untouched by change.".format(
-                                release_spec.name, release_spec.dag_hash()[:7]
-                            )
-                        )
-                        spec_record["needs_rebuild"] = False
-                        continue
-
-                job_object = spack_ci_ir["jobs"][release_spec_dag_hash]["attributes"]
-
-                if not job_object:
-                    tty.warn("No match found for {0}, skipping it".format(release_spec))
+            if prune_untouched_packages:
+                if release_spec not in affected_specs:
+                    spec_record.rebuild = False
+                    spec_record.reason = "Pruned, untouched by change."
                     continue
 
-                if spack_pipeline_type is not None:
-                    # For spack pipelines "public" and "protected" are reserved tags
-                    job_object["tags"] = _remove_reserved_tags(job_object.get("tags", []))
-                    if spack_pipeline_type == "spack_protected_branch":
-                        job_object["tags"].extend(["protected"])
-                    elif spack_pipeline_type == "spack_pull_request":
-                        job_object["tags"].extend(["public"])
+            up_to_date_mirrors = bindist.get_mirrors_for_spec(
+                spec=release_spec, mirrors_to_check=mirrors_to_check, index_only=check_index_only
+            )
 
-                if "script" not in job_object:
-                    raise AttributeError
+            spec_record.rebuild = not up_to_date_mirrors
+            if up_to_date_mirrors:
+                spec_record.reason = "Pruned, found in mirrors"
+                spec_record.mirrors = [m["mirror_url"] for m in up_to_date_mirrors]
+            else:
+                spec_record.reason = "Scheduled, not found anywhere"
 
-                def main_script_replacements(cmd):
-                    return cmd.replace("{env_dir}", rel_concrete_env_dir)
+            job_object = spack_ci_ir["jobs"][release_spec_dag_hash]["attributes"]
 
-                job_object["script"] = _unpack_script(
-                    job_object["script"], op=main_script_replacements
-                )
+            if not job_object:
+                tty.warn("No match found for {0}, skipping it".format(release_spec))
+                continue
 
-                if "before_script" in job_object:
-                    job_object["before_script"] = _unpack_script(job_object["before_script"])
+            if spack_pipeline_type is not None:
+                # For spack pipelines "public" and "protected" are reserved tags
+                job_object["tags"] = _remove_reserved_tags(job_object.get("tags", []))
+                if spack_pipeline_type == "spack_protected_branch":
+                    job_object["tags"].extend(["protected"])
+                elif spack_pipeline_type == "spack_pull_request":
+                    job_object["tags"].extend(["public"])
 
-                if "after_script" in job_object:
-                    job_object["after_script"] = _unpack_script(job_object["after_script"])
+            if "script" not in job_object:
+                raise AttributeError
 
-                osname = str(release_spec.architecture)
-                job_name = get_job_name(
-                    phase_name, strip_compilers, release_spec, osname, build_group
-                )
+            def main_script_replacements(cmd):
+                return cmd.replace("{env_dir}", rel_concrete_env_dir)
 
-                compiler_action = "NONE"
-                if len(phases) > 1:
-                    compiler_action = "FIND_ANY"
-                    if _is_main_phase(phase_name):
-                        compiler_action = "INSTALL_MISSING"
+            job_object["script"] = _unpack_script(
+                job_object["script"], op=main_script_replacements
+            )
 
-                job_vars = job_object.setdefault("variables", {})
-                job_vars["SPACK_JOB_SPEC_DAG_HASH"] = release_spec_dag_hash
-                job_vars["SPACK_JOB_SPEC_PKG_NAME"] = release_spec.name
-                job_vars["SPACK_COMPILER_ACTION"] = compiler_action
+            if "before_script" in job_object:
+                job_object["before_script"] = _unpack_script(job_object["before_script"])
 
-                job_object["needs"] = []
-                if spec_label in dependencies:
-                    if enable_artifacts_buildcache:
-                        # Get dependencies transitively, so they're all
-                        # available in the artifacts buildcache.
-                        dep_jobs = [d for d in release_spec.traverse(deptype=all, root=False)]
-                    else:
-                        # In this case, "needs" is only used for scheduling
-                        # purposes, so we only get the direct dependencies.
-                        dep_jobs = []
-                        for dep_label in dependencies[spec_label]:
-                            dep_jobs.append(spec_labels[dep_label]["spec"])
+            if "after_script" in job_object:
+                job_object["after_script"] = _unpack_script(job_object["after_script"])
 
-                    job_object["needs"].extend(
-                        _format_job_needs(
-                            phase_name,
-                            strip_compilers,
-                            dep_jobs,
-                            osname,
-                            build_group,
-                            prune_dag,
-                            spec_labels,
-                            enable_artifacts_buildcache,
-                        )
-                    )
+            osname = str(release_spec.architecture)
+            job_name = get_job_name(release_spec, osname, build_group)
 
-                rebuild_spec = spec_record["needs_rebuild"]
-
-                # This next section helps gitlab make sure the right
-                # bootstrapped compiler exists in the artifacts buildcache by
-                # creating an artificial dependency between this spec and its
-                # compiler.  So, if we are in the main phase, and if the
-                # compiler we are supposed to use is listed in any of the
-                # bootstrap spec lists, then we will add more dependencies to
-                # the job (that compiler and maybe it's dependencies as well).
-                if _is_main_phase(phase_name):
-                    spec_arch_family = release_spec.architecture.target.microarchitecture.family
-                    compiler_pkg_spec = compilers.pkg_spec_for_compiler(release_spec.compiler)
-                    for bs in bootstrap_specs:
-                        c_spec = bs["spec"]
-                        bs_arch = c_spec.architecture
-                        bs_arch_family = bs_arch.target.microarchitecture.family
-                        if (
-                            c_spec.intersects(compiler_pkg_spec)
-                            and bs_arch_family == spec_arch_family
-                        ):
-                            # We found the bootstrap compiler this release spec
-                            # should be built with, so for DAG scheduling
-                            # purposes, we will at least add the compiler spec
-                            # to the jobs "needs".  But if artifact buildcache
-                            # is enabled, we'll have to add all transtive deps
-                            # of the compiler as well.
-
-                            # Here we check whether the bootstrapped compiler
-                            # needs to be rebuilt.  Until compilers are proper
-                            # dependencies, we artificially force the spec to
-                            # be rebuilt if the compiler targeted to build it
-                            # needs to be rebuilt.
-                            bs_specs, _, _ = staged_phases[bs["phase-name"]]
-                            c_spec_key = _spec_deps_key(c_spec)
-                            rbld_comp = bs_specs[c_spec_key]["needs_rebuild"]
-                            rebuild_spec = rebuild_spec or rbld_comp
-                            # Also update record so dependents do not fail to
-                            # add this spec to their "needs"
-                            spec_record["needs_rebuild"] = rebuild_spec
-
-                            dep_jobs = [c_spec]
-                            if enable_artifacts_buildcache:
-                                dep_jobs = [d for d in c_spec.traverse(deptype=all)]
-
-                            job_object["needs"].extend(
-                                _format_job_needs(
-                                    bs["phase-name"],
-                                    bs["strip-compilers"],
-                                    dep_jobs,
-                                    str(bs_arch),
-                                    build_group,
-                                    prune_dag,
-                                    bs_specs,
-                                    enable_artifacts_buildcache,
-                                )
-                            )
-                        else:
-                            debug_msg = "".join(
-                                [
-                                    "Considered compiler {0} for spec ",
-                                    "{1}, but rejected it either because it was ",
-                                    "not the compiler required by the spec, or ",
-                                    "because the target arch families of the ",
-                                    "spec and the compiler did not match",
-                                ]
-                            ).format(c_spec, release_spec)
-                            tty.debug(debug_msg)
-
-                if prune_dag and not rebuild_spec and not copy_only_pipeline:
-                    tty.debug(
-                        "Pruning {0}/{1}, does not need rebuild.".format(
-                            release_spec.name, release_spec.dag_hash()
-                        )
-                    )
-                    continue
-
-                if broken_spec_urls is not None and release_spec_dag_hash in broken_spec_urls:
-                    known_broken_specs_encountered.append(release_spec_dag_hash)
-
-                # Only keep track of these if we are copying rebuilt cache entries
-                if spack_buildcache_copy:
-                    # TODO: This assumes signed version of the spec
-                    buildcache_copies[release_spec_dag_hash] = [
-                        {
-                            "src": url_util.join(
-                                buildcache_copy_src_prefix,
-                                bindist.build_cache_relative_path(),
-                                bindist.tarball_name(release_spec, ".spec.json.sig"),
-                            ),
-                            "dest": url_util.join(
-                                buildcache_copy_dest_prefix,
-                                bindist.build_cache_relative_path(),
-                                bindist.tarball_name(release_spec, ".spec.json.sig"),
-                            ),
-                        },
-                        {
-                            "src": url_util.join(
-                                buildcache_copy_src_prefix,
-                                bindist.build_cache_relative_path(),
-                                bindist.tarball_path_name(release_spec, ".spack"),
-                            ),
-                            "dest": url_util.join(
-                                buildcache_copy_dest_prefix,
-                                bindist.build_cache_relative_path(),
-                                bindist.tarball_path_name(release_spec, ".spack"),
-                            ),
-                        },
-                    ]
-
-                if artifacts_root:
-                    job_object["needs"].append(
-                        {"job": generate_job_name, "pipeline": "{0}".format(parent_pipeline_id)}
-                    )
-
-                job_vars["SPACK_SPEC_NEEDS_REBUILD"] = str(rebuild_spec)
-
-                if cdash_handler:
-                    cdash_handler.current_spec = release_spec
-                    build_name = cdash_handler.build_name
-                    all_job_names.append(build_name)
-                    job_vars["SPACK_CDASH_BUILD_NAME"] = build_name
-
-                    build_stamp = cdash_handler.build_stamp
-                    job_vars["SPACK_CDASH_BUILD_STAMP"] = build_stamp
-
-                job_object["artifacts"] = spack.config.merge_yaml(
-                    job_object.get("artifacts", {}),
-                    {
-                        "when": "always",
-                        "paths": [
-                            rel_job_log_dir,
-                            rel_job_repro_dir,
-                            rel_job_test_dir,
-                            rel_user_artifacts_dir,
-                        ],
-                    },
-                )
+            job_vars = job_object.setdefault("variables", {})
+            job_vars["SPACK_JOB_SPEC_DAG_HASH"] = release_spec_dag_hash
+            job_vars["SPACK_JOB_SPEC_PKG_NAME"] = release_spec.name
 
+            job_object["needs"] = []
+            if spec_label in dependencies:
                 if enable_artifacts_buildcache:
-                    bc_root = os.path.join(local_mirror_dir, "build_cache")
-                    job_object["artifacts"]["paths"].extend(
-                        [
-                            os.path.join(bc_root, p)
-                            for p in [
-                                bindist.tarball_name(release_spec, ".spec.json"),
-                                bindist.tarball_directory_name(release_spec),
-                            ]
-                        ]
+                    # Get dependencies transitively, so they're all
+                    # available in the artifacts buildcache.
+                    dep_jobs = [d for d in release_spec.traverse(deptype=all, root=False)]
+                else:
+                    # In this case, "needs" is only used for scheduling
+                    # purposes, so we only get the direct dependencies.
+                    dep_jobs = []
+                    for dep_label in dependencies[spec_label]:
+                        dep_jobs.append(spec_labels[dep_label])
+
+                job_object["needs"].extend(
+                    _format_job_needs(
+                        dep_jobs,
+                        osname,
+                        build_group,
+                        prune_dag,
+                        rebuild_decisions,
+                        enable_artifacts_buildcache,
                     )
+                )
 
-                job_object["stage"] = stage_name
-                job_object["retry"] = {"max": 2, "when": JOB_RETRY_CONDITIONS}
-                job_object["interruptible"] = True
+            rebuild_spec = spec_record.rebuild
 
-                length_needs = len(job_object["needs"])
-                if length_needs > max_length_needs:
-                    max_length_needs = length_needs
-                    max_needs_job = job_name
+            if not rebuild_spec and not copy_only_pipeline:
+                if prune_dag:
+                    spec_record.reason = "Pruned, up-to-date"
+                    continue
+                else:
+                    # DAG pruning is disabled, force the spec to rebuild. The
+                    # record still contains any mirrors on which the spec
+                    # may have been found, so we can print them in the staging
+                    # summary.
+                    spec_record.rebuild = True
+                    spec_record.reason = "Scheduled, DAG pruning disabled"
 
-                if not copy_only_pipeline:
-                    output_object[job_name] = job_object
-                    job_id += 1
+            if broken_spec_urls is not None and release_spec_dag_hash in broken_spec_urls:
+                known_broken_specs_encountered.append(release_spec_dag_hash)
+
+            # Only keep track of these if we are copying rebuilt cache entries
+            if spack_buildcache_copy:
+                # TODO: This assumes signed version of the spec
+                buildcache_copies[release_spec_dag_hash] = [
+                    {
+                        "src": url_util.join(
+                            buildcache_copy_src_prefix,
+                            bindist.build_cache_relative_path(),
+                            bindist.tarball_name(release_spec, ".spec.json.sig"),
+                        ),
+                        "dest": url_util.join(
+                            buildcache_copy_dest_prefix,
+                            bindist.build_cache_relative_path(),
+                            bindist.tarball_name(release_spec, ".spec.json.sig"),
+                        ),
+                    },
+                    {
+                        "src": url_util.join(
+                            buildcache_copy_src_prefix,
+                            bindist.build_cache_relative_path(),
+                            bindist.tarball_path_name(release_spec, ".spack"),
+                        ),
+                        "dest": url_util.join(
+                            buildcache_copy_dest_prefix,
+                            bindist.build_cache_relative_path(),
+                            bindist.tarball_path_name(release_spec, ".spack"),
+                        ),
+                    },
+                ]
+
+            if artifacts_root:
+                job_object["needs"].append(
+                    {"job": generate_job_name, "pipeline": "{0}".format(parent_pipeline_id)}
+                )
+
+            # Let downstream jobs know whether the spec needed rebuilding, regardless
+            # whether DAG pruning was enabled or not.
+            job_vars["SPACK_SPEC_NEEDS_REBUILD"] = str(rebuild_spec)
+
+            if cdash_handler:
+                cdash_handler.current_spec = release_spec
+                build_name = cdash_handler.build_name
+                all_job_names.append(build_name)
+                job_vars["SPACK_CDASH_BUILD_NAME"] = build_name
+
+                build_stamp = cdash_handler.build_stamp
+                job_vars["SPACK_CDASH_BUILD_STAMP"] = build_stamp
+
+            job_object["artifacts"] = spack.config.merge_yaml(
+                job_object.get("artifacts", {}),
+                {
+                    "when": "always",
+                    "paths": [
+                        rel_job_log_dir,
+                        rel_job_repro_dir,
+                        rel_job_test_dir,
+                        rel_user_artifacts_dir,
+                    ],
+                },
+            )
+
+            if enable_artifacts_buildcache:
+                bc_root = os.path.join(local_mirror_dir, "build_cache")
+                job_object["artifacts"]["paths"].extend(
+                    [
+                        os.path.join(bc_root, p)
+                        for p in [
+                            bindist.tarball_name(release_spec, ".spec.json"),
+                            bindist.tarball_directory_name(release_spec),
+                        ]
+                    ]
+                )
+
+            job_object["stage"] = stage_name
+            job_object["retry"] = {"max": 2, "when": JOB_RETRY_CONDITIONS}
+            job_object["interruptible"] = True
+
+            length_needs = len(job_object["needs"])
+            if length_needs > max_length_needs:
+                max_length_needs = length_needs
+                max_needs_job = job_name
+
+            if not copy_only_pipeline:
+                output_object[job_name] = job_object
+                job_id += 1
 
     if print_summary:
-        for phase in phases:
-            phase_name = phase["name"]
-            tty.msg('Stages for phase "{0}"'.format(phase_name))
-            phase_stages = staged_phases[phase_name]
-            _print_staging_summary(*phase_stages)
+        _print_staging_summary(spec_labels, stages, mirrors_to_check, rebuild_decisions)
+
+    # Clean up remote mirror override if enabled
+    if remote_mirror_override:
+        spack.mirror.remove("ci_pr_mirror", cfg.default_modify_scope())
+    if spack_pipeline_type == "spack_pull_request":
+        spack.mirror.remove("ci_shared_pr_mirror", cfg.default_modify_scope())
 
     tty.debug("{0} build jobs generated in {1} stages".format(job_id, stage_id))
 
@@ -1576,44 +1423,6 @@ def can_verify_binaries():
     return len(gpg_util.public_keys()) >= 1
 
 
-def configure_compilers(compiler_action, scope=None):
-    """Depending on the compiler_action parameter, either turn on the
-        install_missing_compilers config option, or find spack compilers,
-        or do nothing.  This is used from rebuild jobs in bootstrapping
-        pipelines, where in the bootsrapping phase we would pass
-        FIND_ANY in case of compiler-agnostic bootstrapping, while in the
-        spec building phase we would pass INSTALL_MISSING in order to get
-        spack to use the compiler which was built in the previous phase and
-        is now sitting in the binary mirror.
-
-    Arguments:
-        compiler_action (str): 'FIND_ANY', 'INSTALL_MISSING' have meanings
-            described above.  Any other value essentially results in a no-op.
-        scope (spack.config.ConfigScope): Optional.  The scope in which to look for
-            compilers, in case 'FIND_ANY' was provided.
-    """
-    if compiler_action == "INSTALL_MISSING":
-        tty.debug("Make sure bootstrapped compiler will be installed")
-        config = cfg.get("config")
-        config["install_missing_compilers"] = True
-        cfg.set("config", config)
-    elif compiler_action == "FIND_ANY":
-        tty.debug("Just find any available compiler")
-        find_args = ["find"]
-        if scope:
-            find_args.extend(["--scope", scope])
-        output = spack_compiler(*find_args)
-        tty.debug("spack compiler find")
-        tty.debug(output)
-        output = spack_compiler("list")
-        tty.debug("spack compiler list")
-        tty.debug(output)
-    else:
-        tty.debug("No compiler action to be taken")
-
-    return None
-
-
 def _push_mirror_contents(input_spec, sign_binaries, mirror_url):
     """Unchecked version of the public API, for easier mocking"""
     unsigned = not sign_binaries
@@ -2319,7 +2128,7 @@ def run_standalone_tests(**kwargs):
     tty.debug("spack test exited {0}".format(exit_code))
 
 
-class CDashHandler(object):
+class CDashHandler:
     """
     Class for managing CDash data and processing.
     """

lib/spack/spack/cmd/__init__.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 import os
 import re
@@ -149,7 +147,7 @@ def get_command(cmd_name):
     return getattr(get_module(cmd_name), pname)
 
 
-class _UnquotedFlags(object):
+class _UnquotedFlags:
     """Use a heuristic in `.extract()` to detect whether the user is trying to set
     multiple flags like the docker ENV attribute allows (e.g. 'cflags=-Os -pipe').
 
@@ -547,7 +545,7 @@ class PythonNameError(spack.error.SpackError):
 
     def __init__(self, name):
         self.name = name
-        super(PythonNameError, self).__init__("{0} is not a permissible Python name.".format(name))
+        super().__init__("{0} is not a permissible Python name.".format(name))
 
 
 class CommandNameError(spack.error.SpackError):
@@ -555,9 +553,7 @@ class CommandNameError(spack.error.SpackError):
 
     def __init__(self, name):
         self.name = name
-        super(CommandNameError, self).__init__(
-            "{0} is not a permissible Spack command name.".format(name)
-        )
+        super().__init__("{0} is not a permissible Spack command name.".format(name))
 
 
 ########################################

lib/spack/spack/cmd/arch.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import collections
 
 import archspec.cpu

lib/spack/spack/cmd/bootstrap.py

@@ -2,8 +2,6 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
-from __future__ import print_function
-
 import os.path
 import shutil
 import tempfile

lib/spack/spack/cmd/buildcache.py

@@ -43,13 +43,6 @@ def setup_parser(subparser):
     subparsers = subparser.add_subparsers(help="buildcache sub-commands")
 
     push = subparsers.add_parser("push", aliases=["create"], help=push_fn.__doc__)
-    # TODO: remove from Spack 0.21
-    push.add_argument(
-        "-r",
-        "--rel",
-        action="store_true",
-        help="make all rpaths relative before creating tarballs. (deprecated)",
-    )
     push.add_argument("-f", "--force", action="store_true", help="overwrite tarball if it exists.")
     push.add_argument(
         "-u", "--unsigned", action="store_true", help="push unsigned buildcache tarballs"
@@ -63,37 +56,7 @@ def setup_parser(subparser):
     push.add_argument(
         "-k", "--key", metavar="key", type=str, default=None, help="Key for signing."
     )
-    output = push.add_mutually_exclusive_group(required=False)
-    # TODO: remove from Spack 0.21
-    output.add_argument(
-        "-d",
-        "--directory",
-        metavar="directory",
-        dest="mirror_flag",
-        type=arguments.mirror_directory,
-        help="local directory where buildcaches will be written. (deprecated)",
-    )
-    # TODO: remove from Spack 0.21
-    output.add_argument(
-        "-m",
-        "--mirror-name",
-        metavar="mirror-name",
-        dest="mirror_flag",
-        type=arguments.mirror_name,
-        help="name of the mirror where buildcaches will be written. (deprecated)",
-    )
-    # TODO: remove from Spack 0.21
-    output.add_argument(
-        "--mirror-url",
-        metavar="mirror-url",
-        dest="mirror_flag",
-        type=arguments.mirror_url,
-        help="URL of the mirror where buildcaches will be written. (deprecated)",
-    )
-    # Unfortunately we cannot add this to the mutually exclusive group above,
-    # because we have further positional arguments.
-    # TODO: require from Spack 0.21
-    push.add_argument("mirror", type=str, help="Mirror name, path, or URL.", nargs="?")
+    push.add_argument("mirror", type=str, help="Mirror name, path, or URL.")
     push.add_argument(
         "--update-index",
         "--rebuild-index",
@@ -127,13 +90,6 @@ def setup_parser(subparser):
     install.add_argument(
         "-m", "--multiple", action="store_true", help="allow all matching packages "
     )
-    # TODO: remove from Spack 0.21
-    install.add_argument(
-        "-a",
-        "--allow-root",
-        action="store_true",
-        help="allow install root string in binary files after RPATH substitution. (deprecated)",
-    )
     install.add_argument(
         "-u",
         "--unsigned",
@@ -268,75 +224,21 @@ def setup_parser(subparser):
     # Sync buildcache entries from one mirror to another
     sync = subparsers.add_parser("sync", help=sync_fn.__doc__)
     sync.add_argument(
-        "--manifest-glob",
-        default=None,
-        help="A quoted glob pattern identifying copy manifest files",
+        "--manifest-glob", help="A quoted glob pattern identifying copy manifest files"
     )
-    source = sync.add_mutually_exclusive_group(required=False)
-    # TODO: remove in Spack 0.21
-    source.add_argument(
-        "--src-directory",
-        metavar="DIRECTORY",
-        dest="src_mirror_flag",
-        type=arguments.mirror_directory,
-        help="Source mirror as a local file path (deprecated)",
-    )
-    # TODO: remove in Spack 0.21
-    source.add_argument(
-        "--src-mirror-name",
-        metavar="MIRROR_NAME",
-        dest="src_mirror_flag",
-        type=arguments.mirror_name,
-        help="Name of the source mirror (deprecated)",
-    )
-    # TODO: remove in Spack 0.21
-    source.add_argument(
-        "--src-mirror-url",
-        metavar="MIRROR_URL",
-        dest="src_mirror_flag",
-        type=arguments.mirror_url,
-        help="URL of the source mirror (deprecated)",
-    )
-    # TODO: only support this in 0.21
-    source.add_argument(
+    sync.add_argument(
         "src_mirror",
         metavar="source mirror",
         type=arguments.mirror_name_or_url,
-        help="Source mirror name, path, or URL",
         nargs="?",
+        help="Source mirror name, path, or URL",
     )
-    dest = sync.add_mutually_exclusive_group(required=False)
-    # TODO: remove in Spack 0.21
-    dest.add_argument(
-        "--dest-directory",
-        metavar="DIRECTORY",
-        dest="dest_mirror_flag",
-        type=arguments.mirror_directory,
-        help="Destination mirror as a local file path (deprecated)",
-    )
-    # TODO: remove in Spack 0.21
-    dest.add_argument(
-        "--dest-mirror-name",
-        metavar="MIRROR_NAME",
-        type=arguments.mirror_name,
-        dest="dest_mirror_flag",
-        help="Name of the destination mirror (deprecated)",
-    )
-    # TODO: remove in Spack 0.21
-    dest.add_argument(
-        "--dest-mirror-url",
-        metavar="MIRROR_URL",
-        dest="dest_mirror_flag",
-        type=arguments.mirror_url,
-        help="URL of the destination mirror (deprecated)",
-    )
-    # TODO: only support this in 0.21
-    dest.add_argument(
+    sync.add_argument(
         "dest_mirror",
         metavar="destination mirror",
         type=arguments.mirror_name_or_url,
-        help="Destination mirror name, path, or URL",
         nargs="?",
+        help="Destination mirror name, path, or URL",
     )
     sync.set_defaults(func=sync_fn)
 
@@ -344,39 +246,8 @@ def setup_parser(subparser):
     update_index = subparsers.add_parser(
         "update-index", aliases=["rebuild-index"], help=update_index_fn.__doc__
     )
-    update_index_out = update_index.add_mutually_exclusive_group(required=True)
-    # TODO: remove in Spack 0.21
-    update_index_out.add_argument(
-        "-d",
-        "--directory",
-        metavar="directory",
-        dest="mirror_flag",
-        type=arguments.mirror_directory,
-        help="local directory where buildcaches will be written (deprecated)",
-    )
-    # TODO: remove in Spack 0.21
-    update_index_out.add_argument(
-        "-m",
-        "--mirror-name",
-        metavar="mirror-name",
-        dest="mirror_flag",
-        type=arguments.mirror_name,
-        help="name of the mirror where buildcaches will be written (deprecated)",
-    )
-    # TODO: remove in Spack 0.21
-    update_index_out.add_argument(
-        "--mirror-url",
-        metavar="mirror-url",
-        dest="mirror_flag",
-        type=arguments.mirror_url,
-        help="URL of the mirror where buildcaches will be written (deprecated)",
-    )
-    # TODO: require from Spack 0.21
-    update_index_out.add_argument(
-        "mirror",
-        type=arguments.mirror_name_or_url,
-        help="Destination mirror name, path, or URL",
-        nargs="?",
+    update_index.add_argument(
+        "mirror", type=arguments.mirror_name_or_url, help="Destination mirror name, path, or URL"
     )
     update_index.add_argument(
         "-k",
@@ -436,32 +307,12 @@ def _concrete_spec_from_args(args):
 
 def push_fn(args):
     """create a binary package and push it to a mirror"""
-    if args.mirror_flag:
-        mirror = args.mirror_flag
-    elif not args.mirror:
-        raise ValueError("No mirror provided")
-    else:
-        mirror = arguments.mirror_name_or_url(args.mirror)
-
-    if args.mirror_flag:
-        tty.warn(
-            "Using flags to specify mirrors is deprecated and will be removed in "
-            "Spack 0.21, use positional arguments instead."
-        )
-
-    if args.rel:
-        tty.warn("The --rel flag is deprecated and will be removed in Spack 0.21")
-
-    # TODO: remove this in 0.21. If we have mirror_flag, the first
-    # spec is in the positional mirror arg due to argparse limitations.
-    input_specs = args.specs
-    if args.mirror_flag and args.mirror:
-        input_specs.insert(0, args.mirror)
+    mirror = arguments.mirror_name_or_url(args.mirror)
 
     url = mirror.push_url
 
     specs = bindist.specs_to_be_packaged(
-        _matching_specs(input_specs, args.spec_file),
+        _matching_specs(args.specs, args.spec_file),
         root="package" in args.things_to_install,
         dependencies="dependencies" in args.things_to_install,
     )
@@ -486,7 +337,6 @@ def push_fn(args):
                 url,
                 bindist.PushOptions(
                     force=args.force,
-                    relative=args.rel,
                     unsigned=args.unsigned,
                     allow_root=args.allow_root,
                     key=args.key,
@@ -524,9 +374,6 @@ def install_fn(args):
     if not args.specs:
         tty.die("a spec argument is required to install from a buildcache")
 
-    if args.allow_root:
-        tty.warn("The --allow-root flag is deprecated and will be removed in Spack 0.21")
-
     query = bindist.BinaryCacheQuery(all_architectures=args.otherarch)
     matches = spack.store.find(args.specs, multiple=args.multiple, query_fn=query)
     for match in matches:
@@ -710,21 +557,11 @@ def sync_fn(args):
         manifest_copy(glob.glob(args.manifest_glob))
         return 0
 
-    # If no manifest_glob, require a source and dest mirror.
-    # TODO: Simplify in Spack 0.21
-    if not (args.src_mirror_flag or args.src_mirror) or not (
-        args.dest_mirror_flag or args.dest_mirror
-    ):
-        raise ValueError("Source and destination mirror are required.")
+    if args.src_mirror is None or args.dest_mirror is None:
+        tty.die("Provide mirrors to sync from and to.")
 
-    if args.src_mirror_flag or args.dest_mirror_flag:
-        tty.warn(
-            "Using flags to specify mirrors is deprecated and will be removed in "
-            "Spack 0.21, use positional arguments instead."
-        )
-
-    src_mirror = args.src_mirror_flag if args.src_mirror_flag else args.src_mirror
-    dest_mirror = args.dest_mirror_flag if args.dest_mirror_flag else args.dest_mirror
+    src_mirror = args.src_mirror
+    dest_mirror = args.dest_mirror
 
     src_mirror_url = src_mirror.fetch_url
     dest_mirror_url = dest_mirror.push_url
@@ -803,13 +640,7 @@ def update_index(mirror: spack.mirror.Mirror, update_keys=False):
 
 def update_index_fn(args):
     """Update a buildcache index."""
-    if args.mirror_flag:
-        tty.warn(
-            "Using flags to specify mirrors is deprecated and will be removed in "
-            "Spack 0.21, use positional arguments instead."
-        )
-    mirror = args.mirror_flag if args.mirror_flag else args.mirror
-    update_index(mirror, update_keys=args.keys)
+    update_index(args.mirror, update_keys=args.keys)
 
 
 def buildcache(parser, args):

lib/spack/spack/cmd/checksum.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 import sys
 

lib/spack/spack/cmd/ci.py

@@ -274,7 +274,6 @@ def ci_rebuild(args):
     signing_key = os.environ.get("SPACK_SIGNING_KEY")
     job_spec_pkg_name = os.environ.get("SPACK_JOB_SPEC_PKG_NAME")
     job_spec_dag_hash = os.environ.get("SPACK_JOB_SPEC_DAG_HASH")
-    compiler_action = os.environ.get("SPACK_COMPILER_ACTION")
     spack_pipeline_type = os.environ.get("SPACK_PIPELINE_TYPE")
     remote_mirror_override = os.environ.get("SPACK_REMOTE_MIRROR_OVERRIDE")
     remote_mirror_url = os.environ.get("SPACK_REMOTE_MIRROR_URL")
@@ -295,7 +294,6 @@ def ci_rebuild(args):
     tty.debug("pipeline_artifacts_dir = {0}".format(pipeline_artifacts_dir))
     tty.debug("remote_mirror_url = {0}".format(remote_mirror_url))
     tty.debug("job_spec_pkg_name = {0}".format(job_spec_pkg_name))
-    tty.debug("compiler_action = {0}".format(compiler_action))
 
     # Query the environment manifest to find out whether we're reporting to a
     # CDash instance, and if so, gather some information from the manifest to
@@ -411,14 +409,6 @@ def ci_rebuild(args):
     if signing_key:
         spack_ci.import_signing_key(signing_key)
 
-    # Depending on the specifics of this job, we might need to turn on the
-    # "config:install_missing compilers" option (to build this job spec
-    # with a bootstrapped compiler), or possibly run "spack compiler find"
-    # (to build a bootstrap compiler or one of its deps in a
-    # compiler-agnostic way), or maybe do nothing at all (to build a spec
-    # using a compiler already installed on the target system).
-    spack_ci.configure_compilers(compiler_action)
-
     # Write this job's spec json into the reproduction directory, and it will
     # also be used in the generated "spack install" command to install the spec
     tty.debug("job concrete spec path: {0}".format(job_spec_json_path))

lib/spack/spack/cmd/commands.py

@@ -3,17 +3,22 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 import copy
 import os
 import re
 import sys
+from argparse import ArgumentParser, Namespace
+from typing import IO, Any, Callable, Dict, Sequence, Set
 
 import llnl.util.filesystem as fs
 import llnl.util.tty as tty
-from llnl.util.argparsewriter import ArgparseCompletionWriter, ArgparseRstWriter, ArgparseWriter
+from llnl.util.argparsewriter import (
+    ArgparseCompletionWriter,
+    ArgparseRstWriter,
+    ArgparseWriter,
+    Command,
+)
 from llnl.util.tty.colify import colify
 
 import spack.cmd
@@ -27,12 +32,12 @@
 
 
 #: list of command formatters
-formatters = {}
+formatters: Dict[str, Callable[[Namespace, IO], None]] = {}
 
 
 #: standard arguments for updating completion scripts
 #: we iterate through these when called with --update-completion
-update_completion_args = {
+update_completion_args: Dict[str, Dict[str, Any]] = {
     "bash": {
         "aliases": True,
         "format": "bash",
@@ -42,13 +47,25 @@
 }
 
 
-def formatter(func):
-    """Decorator used to register formatters"""
+def formatter(func: Callable[[Namespace, IO], None]) -> Callable[[Namespace, IO], None]:
+    """Decorator used to register formatters.
+
+    Args:
+        func: Formatting function.
+
+    Returns:
+        The same function.
+    """
     formatters[func.__name__] = func
     return func
 
 
-def setup_parser(subparser):
+def setup_parser(subparser: ArgumentParser) -> None:
+    """Set up the argument parser.
+
+    Args:
+        subparser: Preliminary argument parser.
+    """
     subparser.add_argument(
         "--update-completion",
         action="store_true",
@@ -91,18 +108,34 @@ class SpackArgparseRstWriter(ArgparseRstWriter):
 
     def __init__(
         self,
-        prog,
-        out=None,
-        aliases=False,
-        documented_commands=[],
-        rst_levels=["-", "-", "^", "~", ":", "`"],
+        prog: str,
+        out: IO = sys.stdout,
+        aliases: bool = False,
+        documented_commands: Set[str] = set(),
+        rst_levels: Sequence[str] = ["-", "-", "^", "~", ":", "`"],
     ):
-        out = sys.stdout if out is None else out
-        super(SpackArgparseRstWriter, self).__init__(prog, out, aliases, rst_levels)
+        """Initialize a new SpackArgparseRstWriter instance.
+
+        Args:
+            prog: Program name.
+            out: File object to write to.
+            aliases: Whether or not to include subparsers for aliases.
+            documented_commands: Set of commands with additional documentation.
+            rst_levels: List of characters for rst section headings.
+        """
+        super().__init__(prog, out, aliases, rst_levels)
         self.documented = documented_commands
 
-    def usage(self, *args):
-        string = super(SpackArgparseRstWriter, self).usage(*args)
+    def usage(self, usage: str) -> str:
+        """Example usage of a command.
+
+        Args:
+            usage: Command usage.
+
+        Returns:
+            Usage of a command.
+        """
+        string = super().usage(usage)
 
         cmd = self.parser.prog.replace(" ", "-")
         if cmd in self.documented:
@@ -112,11 +145,21 @@ def usage(self, *args):
 
 
 class SubcommandWriter(ArgparseWriter):
-    def format(self, cmd):
+    """Write argparse output as a list of subcommands."""
+
+    def format(self, cmd: Command) -> str:
+        """Return the string representation of a single node in the parser tree.
+
+        Args:
+            cmd: Parsed information about a command or subcommand.
+
+        Returns:
+            String representation of this subcommand.
+        """
         return "    " * self.level + cmd.prog + "\n"
 
 
-_positional_to_subroutine = {
+_positional_to_subroutine: Dict[str, str] = {
     "package": "_all_packages",
     "spec": "_all_packages",
     "filter": "_all_packages",
@@ -138,7 +181,19 @@ def format(self, cmd):
 class BashCompletionWriter(ArgparseCompletionWriter):
     """Write argparse output as bash programmable tab completion."""
 
-    def body(self, positionals, optionals, subcommands):
+    def body(
+        self, positionals: Sequence[str], optionals: Sequence[str], subcommands: Sequence[str]
+    ) -> str:
+        """Return the body of the function.
+
+        Args:
+            positionals: List of positional arguments.
+            optionals: List of optional arguments.
+            subcommands: List of subcommand parsers.
+
+        Returns:
+            Function body.
+        """
         if positionals:
             return """
     if $list_options
@@ -168,7 +223,15 @@ def body(self, positionals, optionals, subcommands):
                 self.optionals(optionals)
             )
 
-    def positionals(self, positionals):
+    def positionals(self, positionals: Sequence[str]) -> str:
+        """Return the syntax for reporting positional arguments.
+
+        Args:
+            positionals: List of positional arguments.
+
+        Returns:
+            Syntax for positional arguments.
+        """
         # If match found, return function name
         for positional in positionals:
             for key, value in _positional_to_subroutine.items():
@@ -178,22 +241,49 @@ def positionals(self, positionals):
         # If no matches found, return empty list
         return 'SPACK_COMPREPLY=""'
 
-    def optionals(self, optionals):
+    def optionals(self, optionals: Sequence[str]) -> str:
+        """Return the syntax for reporting optional flags.
+
+        Args:
+            optionals: List of optional arguments.
+
+        Returns:
+            Syntax for optional flags.
+        """
         return 'SPACK_COMPREPLY="{0}"'.format(" ".join(optionals))
 
-    def subcommands(self, subcommands):
+    def subcommands(self, subcommands: Sequence[str]) -> str:
+        """Return the syntax for reporting subcommands.
+
+        Args:
+            subcommands: List of subcommand parsers.
+
+        Returns:
+            Syntax for subcommand parsers
+        """
         return 'SPACK_COMPREPLY="{0}"'.format(" ".join(subcommands))
 
 
 @formatter
-def subcommands(args, out):
+def subcommands(args: Namespace, out: IO) -> None:
+    """Hierarchical tree of subcommands.
+
+    args:
+        args: Command-line arguments.
+        out: File object to write to.
+    """
     parser = spack.main.make_argument_parser()
     spack.main.add_all_commands(parser)
     writer = SubcommandWriter(parser.prog, out, args.aliases)
     writer.write(parser)
 
 
-def rst_index(out):
+def rst_index(out: IO) -> None:
+    """Generate an index of all commands.
+
+    Args:
+        out: File object to write to.
+    """
     out.write("\n")
 
     index = spack.main.index_commands()
@@ -221,13 +311,19 @@ def rst_index(out):
 
 
 @formatter
-def rst(args, out):
+def rst(args: Namespace, out: IO) -> None:
+    """ReStructuredText documentation of subcommands.
+
+    args:
+        args: Command-line arguments.
+        out: File object to write to.
+    """
     # create a parser with all commands
     parser = spack.main.make_argument_parser()
     spack.main.add_all_commands(parser)
 
     # extract cross-refs of the form `_cmd-spack-<cmd>:` from rst files
-    documented_commands = set()
+    documented_commands: Set[str] = set()
     for filename in args.rst_files:
         with open(filename) as f:
             for line in f:
@@ -245,7 +341,13 @@ def rst(args, out):
 
 
 @formatter
-def names(args, out):
+def names(args: Namespace, out: IO) -> None:
+    """Simple list of top-level commands.
+
+    args:
+        args: Command-line arguments.
+        out: File object to write to.
+    """
     commands = copy.copy(spack.cmd.all_commands())
 
     if args.aliases:
@@ -255,7 +357,13 @@ def names(args, out):
 
 
 @formatter
-def bash(args, out):
+def bash(args: Namespace, out: IO) -> None:
+    """Bash tab-completion script.
+
+    args:
+        args: Command-line arguments.
+        out: File object to write to.
+    """
     parser = spack.main.make_argument_parser()
     spack.main.add_all_commands(parser)
 
@@ -263,7 +371,13 @@ def bash(args, out):
     writer.write(parser)
 
 
-def prepend_header(args, out):
+def prepend_header(args: Namespace, out: IO) -> None:
+    """Prepend header text at the beginning of a file.
+
+    Args:
+        args: Command-line arguments.
+        out: File object to write to.
+    """
     if not args.header:
         return
 
@@ -271,10 +385,14 @@ def prepend_header(args, out):
         out.write(header.read())
 
 
-def _commands(parser, args):
+def _commands(parser: ArgumentParser, args: Namespace) -> None:
     """This is the 'regular' command, which can be called multiple times.
 
     See ``commands()`` below for ``--update-completion`` handling.
+
+    Args:
+        parser: Argument parser.
+        args: Command-line arguments.
     """
     formatter = formatters[args.format]
 
@@ -296,12 +414,15 @@ def _commands(parser, args):
         formatter(args, sys.stdout)
 
 
-def update_completion(parser, args):
+def update_completion(parser: ArgumentParser, args: Namespace) -> None:
     """Iterate through the shells and update the standard completion files.
 
     This is a convenience method to avoid calling this command many
     times, and to simplify completion update for developers.
 
+    Args:
+        parser: Argument parser.
+        args: Command-line arguments.
     """
     for shell, shell_args in update_completion_args.items():
         for attr, value in shell_args.items():
@@ -309,14 +430,20 @@ def update_completion(parser, args):
         _commands(parser, args)
 
 
-def commands(parser, args):
+def commands(parser: ArgumentParser, args: Namespace) -> None:
+    """Main function that calls formatter functions.
+
+    Args:
+        parser: Argument parser.
+        args: Command-line arguments.
+    """
     if args.update_completion:
         if args.format != "names" or any([args.aliases, args.update, args.header]):
             tty.die("--update-completion can only be specified alone.")
 
         # this runs the command multiple times with different arguments
-        return update_completion(parser, args)
+        update_completion(parser, args)
 
     else:
         # run commands normally
-        return _commands(parser, args)
+        _commands(parser, args)

lib/spack/spack/cmd/common/__init__.py

@@ -36,7 +36,10 @@ def shell_init_instructions(cmd, equivalent):
         "  source %s/setup-env.fish" % spack.paths.share_path,
         "",
         color.colorize("@*c{For Windows batch:}"),
-        "  source %s/spack_cmd.bat" % spack.paths.share_path,
+        "  %s\\spack_cmd.bat" % spack.paths.bin_path,
+        "",
+        color.colorize("@*c{For PowerShell:}"),
+        "  %s\\setup-env.ps1" % spack.paths.share_path,
         "",
         "Or, if you do not want to use shell support, run "
         + ("one of these" if shell_specific else "this")
@@ -50,6 +53,7 @@ def shell_init_instructions(cmd, equivalent):
             equivalent.format(sh_arg="--csh ") + "  # csh/tcsh",
             equivalent.format(sh_arg="--fish") + "  # fish",
             equivalent.format(sh_arg="--bat ") + "  # batch",
+            equivalent.format(sh_arg="--pwsh") + "  # powershell",
         ]
     else:
         msg += ["  " + equivalent]

lib/spack/spack/cmd/common/arguments.py

@@ -349,7 +349,7 @@ def install_status():
         "-I",
         "--install-status",
         action="store_true",
-        default=False,
+        default=True,
         help="show install status of packages. packages can be: "
         "installed [+], missing and needed by an installed package [-], "
         "installed in and upstream instance [^], "
@@ -357,6 +357,17 @@ def install_status():
     )
 
 
+@arg
+def no_install_status():
+    return Args(
+        "--no-install-status",
+        dest="install_status",
+        action="store_false",
+        default=True,
+        help="do not show install status annotations",
+    )
+
+
 @arg
 def no_checksum():
     return Args(
@@ -468,7 +479,7 @@ def __init__(
         # substituting '_' for ':'.
         dest = dest.replace(":", "_")
 
-        super(ConfigSetAction, self).__init__(
+        super().__init__(
             option_strings=option_strings,
             dest=dest,
             nargs=0,

lib/spack/spack/cmd/common/env_utility.py

@@ -2,8 +2,6 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
-from __future__ import print_function
-
 import argparse
 import os
 

lib/spack/spack/cmd/compiler.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 import sys
 

lib/spack/spack/cmd/config.py

@@ -2,8 +2,6 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
-from __future__ import print_function
-
 import collections
 import os
 import shutil

lib/spack/spack/cmd/create.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import os
 import re
 import urllib.parse
@@ -71,7 +69,7 @@ class {class_name}({base_class_name}):
 '''
 
 
-class BundlePackageTemplate(object):
+class BundlePackageTemplate:
     """
     Provides the default values to be used for a bundle package file template.
     """
@@ -122,7 +120,7 @@ def install(self, spec, prefix):
     url_line = '    url = "{url}"'
 
     def __init__(self, name, url, versions):
-        super(PackageTemplate, self).__init__(name, versions)
+        super().__init__(name, versions)
 
         self.url_def = self.url_line.format(url=url)
 
@@ -200,7 +198,7 @@ def __init__(self, name, url, *args, **kwargs):
             # Make it more obvious that we are renaming the package
             tty.msg("Changing package name from {0} to lua-{0}".format(name))
             name = "lua-{0}".format(name)
-        super(LuaPackageTemplate, self).__init__(name, url, *args, **kwargs)
+        super().__init__(name, url, *args, **kwargs)
 
 
 class MesonPackageTemplate(PackageTemplate):
@@ -308,7 +306,7 @@ def __init__(self, name, url, *args, **kwargs):
             tty.msg("Changing package name from {0} to rkt-{0}".format(name))
             name = "rkt-{0}".format(name)
         self.body_def = self.body_def.format(name[4:])
-        super(RacketPackageTemplate, self).__init__(name, url, *args, **kwargs)
+        super().__init__(name, url, *args, **kwargs)
 
 
 class PythonPackageTemplate(PackageTemplate):
@@ -400,7 +398,7 @@ def __init__(self, name, url, *args, **kwargs):
                 + self.url_line
             )
 
-        super(PythonPackageTemplate, self).__init__(name, url, *args, **kwargs)
+        super().__init__(name, url, *args, **kwargs)
 
 
 class RPackageTemplate(PackageTemplate):
@@ -439,7 +437,7 @@ def __init__(self, name, url, *args, **kwargs):
         if bioc:
             self.url_line = '    url = "{0}"\n' '    bioc = "{1}"'.format(url, r_name)
 
-        super(RPackageTemplate, self).__init__(name, url, *args, **kwargs)
+        super().__init__(name, url, *args, **kwargs)
 
 
 class PerlmakePackageTemplate(PackageTemplate):
@@ -466,7 +464,7 @@ def __init__(self, name, *args, **kwargs):
             tty.msg("Changing package name from {0} to perl-{0}".format(name))
             name = "perl-{0}".format(name)
 
-        super(PerlmakePackageTemplate, self).__init__(name, *args, **kwargs)
+        super().__init__(name, *args, **kwargs)
 
 
 class PerlbuildPackageTemplate(PerlmakePackageTemplate):
@@ -499,7 +497,7 @@ def __init__(self, name, *args, **kwargs):
             tty.msg("Changing package name from {0} to octave-{0}".format(name))
             name = "octave-{0}".format(name)
 
-        super(OctavePackageTemplate, self).__init__(name, *args, **kwargs)
+        super().__init__(name, *args, **kwargs)
 
 
 class RubyPackageTemplate(PackageTemplate):
@@ -527,7 +525,7 @@ def __init__(self, name, *args, **kwargs):
             tty.msg("Changing package name from {0} to ruby-{0}".format(name))
             name = "ruby-{0}".format(name)
 
-        super(RubyPackageTemplate, self).__init__(name, *args, **kwargs)
+        super().__init__(name, *args, **kwargs)
 
 
 class MakefilePackageTemplate(PackageTemplate):
@@ -572,7 +570,7 @@ def __init__(self, name, *args, **kwargs):
             tty.msg("Changing package name from {0} to py-{0}".format(name))
             name = "py-{0}".format(name)
 
-        super(SIPPackageTemplate, self).__init__(name, *args, **kwargs)
+        super().__init__(name, *args, **kwargs)
 
 
 templates = {
@@ -715,7 +713,7 @@ def __call__(self, stage, url):
                 output = tar("--exclude=*/*/*", "-tf", stage.archive_file, output=str)
             except ProcessError:
                 output = ""
-        lines = output.split("\n")
+        lines = output.splitlines()
 
         # Determine the build system based on the files contained
         # in the archive.

lib/spack/spack/cmd/debug.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import os
 import platform
 import re

lib/spack/spack/cmd/deprecate.py

@@ -13,8 +13,6 @@
 It is up to the user to ensure binary compatibility between the deprecated
 installation and its deprecator.
 """
-from __future__ import print_function
-
 import argparse
 import os
 

lib/spack/spack/cmd/env.py

@@ -86,6 +86,13 @@ def env_activate_setup_parser(subparser):
         const="bat",
         help="print bat commands to activate the environment",
     )
+    shells.add_argument(
+        "--pwsh",
+        action="store_const",
+        dest="shell",
+        const="pwsh",
+        help="print powershell commands to activate environment",
+    )
 
     view_options = subparser.add_mutually_exclusive_group()
     view_options.add_argument(
@@ -411,7 +418,7 @@ def env_list(args):
     colify(color_names, indent=4)
 
 
-class ViewAction(object):
+class ViewAction:
     regenerate = "regenerate"
     enable = "enable"
     disable = "disable"

lib/spack/spack/cmd/external.py

@@ -2,8 +2,6 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
-from __future__ import print_function
-
 import argparse
 import errno
 import os

lib/spack/spack/cmd/find.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import copy
 import sys
 

lib/spack/spack/cmd/info.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import textwrap
 from itertools import zip_longest
 
@@ -73,7 +71,7 @@ def variant(s):
     return spack.spec.enabled_variant_color + s + plain_format
 
 
-class VariantFormatter(object):
+class VariantFormatter:
     def __init__(self, variants):
         self.variants = variants
         self.headers = ("Name [Default]", "When", "Allowed values", "Description")

lib/spack/spack/cmd/license.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import os
 import re
 from collections import defaultdict
@@ -102,7 +100,7 @@ def list_files(args):
 ]
 
 
-class LicenseError(object):
+class LicenseError:
     def __init__(self):
         self.error_counts = defaultdict(int)
 

lib/spack/spack/cmd/list.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import division, print_function
-
 import argparse
 import fnmatch
 import json

lib/spack/spack/cmd/location.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import os
 
 import llnl.util.tty as tty

lib/spack/spack/cmd/maintainers.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 from collections import defaultdict
 

lib/spack/spack/cmd/make_installer.py

@@ -49,9 +49,8 @@ def setup_parser(subparser):
         "-g",
         "--git-installer-verbosity",
         default="",
-        choices=set(["SILENT", "VERYSILENT"]),
-        help="Level of verbosity provided by bundled Git Installer.\
-             Default is fully verbose",
+        choices=["SILENT", "VERYSILENT"],
+        help="Level of verbosity provided by bundled Git Installer. Default is fully verbose",
         required=False,
         action="store",
         dest="git_verbosity",

lib/spack/spack/cmd/mark.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import sys
 
 from llnl.util import tty

lib/spack/spack/cmd/pkg.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 import itertools
 import os

lib/spack/spack/cmd/python.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 import code
 import os

lib/spack/spack/cmd/repo.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import os
 import sys
 

lib/spack/spack/cmd/resource.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import os
 
 import llnl.util.tty as tty

lib/spack/spack/cmd/solve.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 import re
 import sys
@@ -44,7 +42,11 @@ def setup_parser(subparser):
     )
 
     # Below are arguments w.r.t. spec display (like spack spec)
-    arguments.add_common_arguments(subparser, ["long", "very_long", "install_status"])
+    arguments.add_common_arguments(subparser, ["long", "very_long"])
+
+    install_status_group = subparser.add_mutually_exclusive_group()
+    arguments.add_common_arguments(install_status_group, ["install_status", "no_install_status"])
+
     subparser.add_argument(
         "-y",
         "--yaml",

lib/spack/spack/cmd/spec.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import sys
 
 import llnl.util.lang as lang
@@ -31,7 +29,11 @@ def setup_parser(subparser):
 for further documentation regarding the spec syntax, see:
     spack help --spec
 """
-    arguments.add_common_arguments(subparser, ["long", "very_long", "install_status"])
+    arguments.add_common_arguments(subparser, ["long", "very_long"])
+
+    install_status_group = subparser.add_mutually_exclusive_group()
+    arguments.add_common_arguments(install_status_group, ["install_status", "no_install_status"])
+
     format_group = subparser.add_mutually_exclusive_group()
     format_group.add_argument(
         "-y",

lib/spack/spack/cmd/style.py

@@ -60,7 +60,7 @@ def is_package(f):
 
 
 #: decorator for adding tools to the list
-class tool(object):
+class tool:
     def __init__(self, name, required=False):
         self.name = name
         self.required = required

lib/spack/spack/cmd/test.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import argparse
 import fnmatch
 import os

lib/spack/spack/cmd/tutorial.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import os.path
 import shutil
 

lib/spack/spack/cmd/uninstall.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import sys
 from typing import Dict, List, Optional
 

lib/spack/spack/cmd/unit_test.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import division, print_function
-
 import argparse
 import collections
 import io

lib/spack/spack/cmd/url.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import division, print_function
-
 import urllib.parse
 from collections import defaultdict
 
@@ -290,7 +288,7 @@ def url_stats(args):
     # dictionary of issue type -> package -> descriptions
     issues = defaultdict(lambda: defaultdict(lambda: []))
 
-    class UrlStats(object):
+    class UrlStats:
         def __init__(self):
             self.total = 0
             self.schemes = defaultdict(lambda: 0)

lib/spack/spack/cmd/verify.py

@@ -2,8 +2,6 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
-from __future__ import print_function
-
 import argparse
 
 import llnl.util.tty as tty

lib/spack/spack/cmd/versions.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import sys
 
 import llnl.util.tty as tty

lib/spack/spack/compiler.py

@@ -189,7 +189,7 @@ def in_system_subdirectory(path):
     return any(path_contains_subdirectory(path, x) for x in system_dirs)
 
 
-class Compiler(object):
+class Compiler:
     """This class encapsulates a Spack "compiler", which includes C,
     C++, and Fortran compilers.  Subclasses should implement
     support for specific compilers, their possible names, arguments,
@@ -673,17 +673,17 @@ class CompilerAccessError(spack.error.SpackError):
     def __init__(self, compiler, paths):
         msg = "Compiler '%s' has executables that are missing" % compiler.spec
         msg += " or are not executable: %s" % paths
-        super(CompilerAccessError, self).__init__(msg)
+        super().__init__(msg)
 
 
 class InvalidCompilerError(spack.error.SpackError):
     def __init__(self):
-        super(InvalidCompilerError, self).__init__("Compiler has no executables.")
+        super().__init__("Compiler has no executables.")
 
 
 class UnsupportedCompilerFlag(spack.error.SpackError):
     def __init__(self, compiler, feature, flag_name, ver_string=None):
-        super(UnsupportedCompilerFlag, self).__init__(
+        super().__init__(
             "{0} ({1}) does not support {2} (as compiler.{3}).".format(
                 compiler.name, ver_string if ver_string else compiler.version, feature, flag_name
             ),

lib/spack/spack/compilers/__init__.py

@@ -369,7 +369,7 @@ def compiler_specs_for_arch(arch_spec, scope=None):
     return [c.spec for c in compilers_for_arch(arch_spec, scope)]
 
 
-class CacheReference(object):
+class CacheReference:
     """This acts as a hashable reference to any object (regardless of whether
     the object itself is hashable) and also prevents the object from being
     garbage-collected (so if two CacheReference objects are equal, they
@@ -820,7 +820,7 @@ def name_matches(name, name_list):
 
 class InvalidCompilerConfigurationError(spack.error.SpackError):
     def __init__(self, compiler_spec):
-        super(InvalidCompilerConfigurationError, self).__init__(
+        super().__init__(
             'Invalid configuration for [compiler "%s"]: ' % compiler_spec,
             "Compiler configuration must contain entries for all compilers: %s"
             % _path_instance_vars,
@@ -829,19 +829,17 @@ def __init__(self, compiler_spec):
 
 class NoCompilersError(spack.error.SpackError):
     def __init__(self):
-        super(NoCompilersError, self).__init__("Spack could not find any compilers!")
+        super().__init__("Spack could not find any compilers!")
 
 
 class UnknownCompilerError(spack.error.SpackError):
     def __init__(self, compiler_name):
-        super(UnknownCompilerError, self).__init__(
-            "Spack doesn't support the requested compiler: {0}".format(compiler_name)
-        )
+        super().__init__("Spack doesn't support the requested compiler: {0}".format(compiler_name))
 
 
 class NoCompilerForSpecError(spack.error.SpackError):
     def __init__(self, compiler_spec, target):
-        super(NoCompilerForSpecError, self).__init__(
+        super().__init__(
             "No compilers for operating system %s satisfy spec %s" % (target, compiler_spec)
         )
 
@@ -860,11 +858,9 @@ def __init__(self, compiler_spec, arch_spec):
             + " in the following files:\n\t"
             + "\n\t".join(duplicate_msg(x, y) for x, y in duplicate_table)
         )
-        super(CompilerDuplicateError, self).__init__(msg)
+        super().__init__(msg)
 
 
 class CompilerSpecInsufficientlySpecificError(spack.error.SpackError):
     def __init__(self, compiler_spec):
-        super(CompilerSpecInsufficientlySpecificError, self).__init__(
-            "Multiple compilers satisfy spec %s" % compiler_spec
-        )
+        super().__init__("Multiple compilers satisfy spec %s" % compiler_spec)

lib/spack/spack/compilers/apple_clang.py

@@ -132,7 +132,7 @@ def setup_custom_environment(self, pkg, env):
         the 'DEVELOPER_DIR' environment variables to cause the xcrun and
         related tools to use this Xcode.app.
         """
-        super(AppleClang, self).setup_custom_environment(pkg, env)
+        super().setup_custom_environment(pkg, env)
 
         if not pkg.use_xcode:
             # if we do it for all packages, we get into big troubles with MPI:

lib/spack/spack/compilers/cce.py

@@ -12,7 +12,7 @@ class Cce(Compiler):
     """Cray compiler environment compiler."""
 
     def __init__(self, *args, **kwargs):
-        super(Cce, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
         # For old cray compilers on module based systems we replace
         # ``version_argument`` with the old value. Cannot be a property
         # as the new value is used in classmethods for path-based detection

lib/spack/spack/compilers/msvc.py

@@ -77,7 +77,7 @@ class Msvc(Compiler):
     def __init__(self, *args, **kwargs):
         new_pth = [pth if pth else get_valid_fortran_pth(args[0].version) for pth in args[3]]
         args[3][:] = new_pth
-        super(Msvc, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
         if os.getenv("ONEAPI_ROOT"):
             # If this found, it sets all the vars
             self.setvarsfile = os.path.join(os.getenv("ONEAPI_ROOT"), "setvars.bat")

lib/spack/spack/concretize.py

@@ -14,8 +14,6 @@
 TODO: make this customizable and allow users to configure
       concretization  policies.
 """
-from __future__ import print_function
-
 import functools
 import platform
 import tempfile
@@ -50,7 +48,7 @@
 
 
 @functools.total_ordering
-class reverse_order(object):
+class reverse_order:
     """Helper for creating key functions.
 
     This is a wrapper that inverts the sense of the natural
@@ -67,7 +65,7 @@ def __lt__(self, other):
         return other.value < self.value
 
 
-class Concretizer(object):
+class Concretizer:
     """You can subclass this class to override some of the default
     concretization strategies, or you can override all of them.
     """
@@ -794,9 +792,7 @@ def __init__(self, arch, available_os_targets):
             " operating systems and targets:\n\t" + "\n\t".join(available_os_target_strs)
         )
 
-        super(NoCompilersForArchError, self).__init__(
-            err_msg, "Run 'spack compiler find' to add compilers."
-        )
+        super().__init__(err_msg, "Run 'spack compiler find' to add compilers.")
 
 
 class UnavailableCompilerVersionError(spack.error.SpackError):
@@ -808,7 +804,7 @@ def __init__(self, compiler_spec, arch=None):
         if arch:
             err_msg += " for operating system {0} and target {1}.".format(arch.os, arch.target)
 
-        super(UnavailableCompilerVersionError, self).__init__(
+        super().__init__(
             err_msg,
             "Run 'spack compiler find' to add compilers or "
             "'spack compilers' to see which compilers are already recognized"
@@ -821,7 +817,7 @@ class NoValidVersionError(spack.error.SpackError):
     particular spec."""
 
     def __init__(self, spec):
-        super(NoValidVersionError, self).__init__(
+        super().__init__(
             "There are no valid versions for %s that match '%s'" % (spec.name, spec.versions)
         )
 
@@ -832,7 +828,7 @@ class InsufficientArchitectureInfoError(spack.error.SpackError):
     system"""
 
     def __init__(self, spec, archs):
-        super(InsufficientArchitectureInfoError, self).__init__(
+        super().__init__(
             "Cannot determine necessary architecture information for '%s': %s"
             % (spec.name, str(archs))
         )
@@ -848,4 +844,4 @@ def __init__(self, spec):
             "The spec\n    '%s'\n    is configured as not buildable, "
             "and no matching external installs were found"
         )
-        super(NoBuildError, self).__init__(msg % spec)
+        super().__init__(msg % spec)

lib/spack/spack/config.py

@@ -111,7 +111,7 @@
 overrides_base_name = "overrides-"
 
 
-class ConfigScope(object):
+class ConfigScope:
     """This class represents a configuration scope.
 
     A scope is one directory containing named configuration files.
@@ -182,7 +182,7 @@ def __init__(self, name, path, schema, yaml_path=None):
                        config:
                          install_tree: $spack/opt/spack
         """
-        super(SingleFileScope, self).__init__(name, path)
+        super().__init__(name, path)
         self._raw_data = None
         self.schema = schema
         self.yaml_path = yaml_path or []
@@ -310,7 +310,7 @@ class InternalConfigScope(ConfigScope):
     """
 
     def __init__(self, name, data=None):
-        super(InternalConfigScope, self).__init__(name, None)
+        super().__init__(name, None)
         self.sections = syaml.syaml_dict()
 
         if data:
@@ -382,7 +382,7 @@ def _method(self, *args, **kwargs):
     return _method
 
 
-class Configuration(object):
+class Configuration:
     """A full Spack configuration, from a hierarchy of config files.
 
     This class makes it easy to add a new scope on top of an existing one.
@@ -1495,7 +1495,7 @@ def __init__(self, validation_error, data, filename=None, line=None):
             location += ":%d" % line
 
         message = "%s: %s" % (location, validation_error.message)
-        super(ConfigError, self).__init__(message)
+        super().__init__(message)
 
     def _get_mark(self, validation_error, data):
         """Get the file/line mark fo a validation error from a Spack YAML file."""

lib/spack/spack/container/writers/docker.py

@@ -18,7 +18,7 @@ class DockerContext(PathContext):
 
     @tengine.context_property
     def manifest(self):
-        manifest_str = super(DockerContext, self).manifest
+        manifest_str = super().manifest
         # Docker doesn't support HEREDOC, so we need to resort to
         # a horrible echo trick to have the manifest in the Dockerfile
         echoed_lines = []

lib/spack/spack/cray_manifest.py

@@ -164,7 +164,10 @@ def entries_to_specs(entries):
                     continue
                 parent_spec = spec_dict[entry["hash"]]
                 dep_spec = spec_dict[dep_hash]
-                parent_spec._add_dependency(dep_spec, deptypes=deptypes)
+                parent_spec._add_dependency(dep_spec, deptypes=deptypes, virtuals=())
+
+    for spec in spec_dict.values():
+        spack.spec.reconstruct_virtuals_on_edges(spec)
 
     return spec_dict
 
@@ -196,4 +199,4 @@ def read(path, apply_updates):
 
 class ManifestValidationError(spack.error.SpackError):
     def __init__(self, msg, long_msg=None):
-        super(ManifestValidationError, self).__init__(msg, long_msg)
+        super().__init__(msg, long_msg)

lib/spack/spack/database.py

@@ -60,7 +60,7 @@
 # DB version.  This is stuck in the DB file to track changes in format.
 # Increment by one when the database format changes.
 # Versions before 5 were not integers.
-_db_version = vn.Version("6")
+_db_version = vn.Version("7")
 
 # For any version combinations here, skip reindex when upgrading.
 # Reindexing can take considerable time and is not always necessary.
@@ -72,6 +72,7 @@
     # version is saved to disk the first time the DB is written.
     (vn.Version("0.9.3"), vn.Version("5")),
     (vn.Version("5"), vn.Version("6")),
+    (vn.Version("6"), vn.Version("7")),
 ]
 
 # Default timeout for spack database locks in seconds or None (no timeout).
@@ -105,7 +106,11 @@
 
 
 def reader(version):
-    reader_cls = {vn.Version("5"): spack.spec.SpecfileV1, vn.Version("6"): spack.spec.SpecfileV3}
+    reader_cls = {
+        vn.Version("5"): spack.spec.SpecfileV1,
+        vn.Version("6"): spack.spec.SpecfileV3,
+        vn.Version("7"): spack.spec.SpecfileV4,
+    }
     return reader_cls[version]
 
 
@@ -130,7 +135,7 @@ class InstallStatus(str):
     pass
 
 
-class InstallStatuses(object):
+class InstallStatuses:
     INSTALLED = InstallStatus("installed")
     DEPRECATED = InstallStatus("deprecated")
     MISSING = InstallStatus("missing")
@@ -157,7 +162,7 @@ def canonicalize(cls, query_arg):
             return query_arg
 
 
-class InstallRecord(object):
+class InstallRecord:
     """A record represents one installation in the DB.
 
     The record keeps track of the spec for the installation, its
@@ -248,7 +253,7 @@ class ForbiddenLockError(SpackError):
     """Raised when an upstream DB attempts to acquire a lock"""
 
 
-class ForbiddenLock(object):
+class ForbiddenLock:
     def __getattribute__(self, name):
         raise ForbiddenLockError("Cannot access attribute '{0}' of lock".format(name))
 
@@ -302,7 +307,7 @@ def __getattribute__(self, name):
         """
 
 
-class Database(object):
+class Database:
 
     """Per-process lock objects for each install prefix."""
 
@@ -743,7 +748,9 @@ def _assign_dependencies(self, spec_reader, hash_key, installs, data):
             spec_node_dict = spec_node_dict[spec.name]
         if "dependencies" in spec_node_dict:
             yaml_deps = spec_node_dict["dependencies"]
-            for dname, dhash, dtypes, _ in spec_reader.read_specfile_dep_specs(yaml_deps):
+            for dname, dhash, dtypes, _, virtuals in spec_reader.read_specfile_dep_specs(
+                yaml_deps
+            ):
                 # It is important that we always check upstream installations
                 # in the same order, and that we always check the local
                 # installation first: if a downstream Spack installs a package
@@ -766,7 +773,7 @@ def _assign_dependencies(self, spec_reader, hash_key, installs, data):
                     tty.warn(msg)
                     continue
 
-                spec._add_dependency(child, deptypes=dtypes)
+                spec._add_dependency(child, deptypes=dtypes, virtuals=virtuals)
 
     def _read_from_file(self, filename):
         """Fill database from file, do not maintain old data.
@@ -1172,7 +1179,7 @@ def _add(
             for dep in spec.edges_to_dependencies(deptype=_tracked_deps):
                 dkey = dep.spec.dag_hash()
                 upstream, record = self.query_by_spec_hash(dkey)
-                new_spec._add_dependency(record.spec, deptypes=dep.deptypes)
+                new_spec._add_dependency(record.spec, deptypes=dep.deptypes, virtuals=dep.virtuals)
                 if not upstream:
                     record.ref_count += 1
 
@@ -1660,7 +1667,7 @@ def __init__(self, database, expected, found):
             f"you need a newer Spack version to read the DB in '{database.root}'. "
             f"{self.database_version_message}"
         )
-        super(InvalidDatabaseVersionError, self).__init__(msg)
+        super().__init__(msg)
 
     @property
     def database_version_message(self):

lib/spack/spack/detection/common.py

@@ -112,10 +112,15 @@ def path_to_dict(search_paths):
     # Reverse order of search directories so that a lib in the first
     # entry overrides later entries
     for search_path in reversed(search_paths):
-        for lib in os.listdir(search_path):
-            lib_path = os.path.join(search_path, lib)
-            if llnl.util.filesystem.is_readable_file(lib_path):
-                path_to_lib[lib_path] = lib
+        try:
+            for lib in os.listdir(search_path):
+                lib_path = os.path.join(search_path, lib)
+                if llnl.util.filesystem.is_readable_file(lib_path):
+                    path_to_lib[lib_path] = lib
+        except OSError as e:
+            msg = f"cannot scan '{search_path}' for external software: {str(e)}"
+            llnl.util.tty.debug(msg)
+
     return path_to_lib
 
 
@@ -224,7 +229,7 @@ def _windows_drive():
     return drive
 
 
-class WindowsCompilerExternalPaths(object):
+class WindowsCompilerExternalPaths:
     @staticmethod
     def find_windows_compiler_root_paths():
         """Helper for Windows compiler installation root discovery
@@ -260,7 +265,7 @@ def find_windows_compiler_bundled_packages():
         )
 
 
-class WindowsKitExternalPaths(object):
+class WindowsKitExternalPaths:
     if sys.platform == "win32":
         plat_major_ver = str(winOs.windows_version()[0])
 

lib/spack/spack/directory_layout.py

@@ -37,7 +37,7 @@ def _check_concrete(spec):
         raise ValueError("Specs passed to a DirectoryLayout must be concrete!")
 
 
-class DirectoryLayout(object):
+class DirectoryLayout:
     """A directory layout is used to associate unique paths with specs.
     Different installations are going to want different layouts for their
     install, and they can use this to customize the nesting structure of
@@ -388,14 +388,14 @@ class DirectoryLayoutError(SpackError):
     """Superclass for directory layout errors."""
 
     def __init__(self, message, long_msg=None):
-        super(DirectoryLayoutError, self).__init__(message, long_msg)
+        super().__init__(message, long_msg)
 
 
 class RemoveFailedError(DirectoryLayoutError):
     """Raised when a DirectoryLayout cannot remove an install prefix."""
 
     def __init__(self, installed_spec, prefix, error):
-        super(RemoveFailedError, self).__init__(
+        super().__init__(
             "Could not remove prefix %s for %s : %s" % (prefix, installed_spec.short_spec, error)
         )
         self.cause = error
@@ -405,7 +405,7 @@ class InconsistentInstallDirectoryError(DirectoryLayoutError):
     """Raised when a package seems to be installed to the wrong place."""
 
     def __init__(self, message, long_msg=None):
-        super(InconsistentInstallDirectoryError, self).__init__(message, long_msg)
+        super().__init__(message, long_msg)
 
 
 class SpecReadError(DirectoryLayoutError):
@@ -416,7 +416,7 @@ class InvalidDirectoryLayoutParametersError(DirectoryLayoutError):
     """Raised when a invalid directory layout parameters are supplied"""
 
     def __init__(self, message, long_msg=None):
-        super(InvalidDirectoryLayoutParametersError, self).__init__(message, long_msg)
+        super().__init__(message, long_msg)
 
 
 class InvalidExtensionSpecError(DirectoryLayoutError):
@@ -427,16 +427,14 @@ class ExtensionAlreadyInstalledError(DirectoryLayoutError):
     """Raised when an extension is added to a package that already has it."""
 
     def __init__(self, spec, ext_spec):
-        super(ExtensionAlreadyInstalledError, self).__init__(
-            "%s is already installed in %s" % (ext_spec.short_spec, spec.short_spec)
-        )
+        super().__init__("%s is already installed in %s" % (ext_spec.short_spec, spec.short_spec))
 
 
 class ExtensionConflictError(DirectoryLayoutError):
     """Raised when an extension is added to a package that already has it."""
 
     def __init__(self, spec, ext_spec, conflict):
-        super(ExtensionConflictError, self).__init__(
+        super().__init__(
             "%s cannot be installed in %s because it conflicts with %s"
             % (ext_spec.short_spec, spec.short_spec, conflict.short_spec)
         )

lib/spack/spack/environment/environment.py

@@ -39,7 +39,6 @@
 import spack.stage
 import spack.store
 import spack.subprocess_context
-import spack.traverse
 import spack.user_environment as uenv
 import spack.util.cpus
 import spack.util.environment
@@ -51,6 +50,7 @@
 import spack.util.spack_yaml as syaml
 import spack.util.url
 import spack.version
+from spack import traverse
 from spack.filesystem_view import SimpleFilesystemView, inverse_view_func_parser, view_func_parser
 from spack.installer import PackageInstaller
 from spack.schema.env import TOP_LEVEL_KEY
@@ -125,7 +125,7 @@ def default_manifest_yaml():
 valid_environment_name_re = r"^\w[\w-]*$"
 
 #: version of the lockfile format. Must increase monotonically.
-lockfile_format_version = 4
+lockfile_format_version = 5
 
 
 READER_CLS = {
@@ -133,6 +133,7 @@ def default_manifest_yaml():
     2: spack.spec.SpecfileV1,
     3: spack.spec.SpecfileV2,
     4: spack.spec.SpecfileV3,
+    5: spack.spec.SpecfileV4,
 }
 
 
@@ -425,32 +426,6 @@ def _is_dev_spec_and_has_changed(spec):
     return mtime > record.installation_time
 
 
-def _spec_needs_overwrite(spec, changed_dev_specs):
-    """Check whether the current spec needs to be overwritten because either it has
-    changed itself or one of its dependencies have changed
-    """
-    # if it's not installed, we don't need to overwrite it
-    if not spec.installed:
-        return False
-
-    # If the spec itself has changed this is a trivial decision
-    if spec in changed_dev_specs:
-        return True
-
-    # if spec and all deps aren't dev builds, we don't need to overwrite it
-    if not any(spec.satisfies(c) for c in ("dev_path=*", "^dev_path=*")):
-        return False
-
-    # If any dep needs overwrite, or any dep is missing and is a dev build then
-    # overwrite this package
-    if any(
-        ((not dep.installed) and dep.satisfies("dev_path=*"))
-        or _spec_needs_overwrite(dep, changed_dev_specs)
-        for dep in spec.traverse(root=False)
-    ):
-        return True
-
-
 def _error_on_nonempty_view_dir(new_root):
     """Defensively error when the target view path already exists and is not an
     empty directory. This usually happens when the view symlink was removed, but
@@ -635,18 +610,16 @@ def specs_for_view(self, concretized_root_specs):
         From the list of concretized user specs in the environment, flatten
         the dags, and filter selected, installed specs, remove duplicates on dag hash.
         """
-        dag_hash = lambda spec: spec.dag_hash()
-
         # With deps, requires traversal
         if self.link == "all" or self.link == "run":
             deptype = ("run") if self.link == "run" else ("link", "run")
             specs = list(
-                spack.traverse.traverse_nodes(
-                    concretized_root_specs, deptype=deptype, key=dag_hash
+                traverse.traverse_nodes(
+                    concretized_root_specs, deptype=deptype, key=traverse.by_dag_hash
                 )
             )
         else:
-            specs = list(dedupe(concretized_root_specs, key=dag_hash))
+            specs = list(dedupe(concretized_root_specs, key=traverse.by_dag_hash))
 
         # Filter selected, installed specs
         with spack.store.db.read_transaction():
@@ -1548,12 +1521,13 @@ def _concretize_separately(self, tests=False):
             for h in self.specs_by_hash:
                 current_spec, computed_spec = self.specs_by_hash[h], by_hash[h]
                 for node in computed_spec.traverse():
-                    test_deps = node.dependencies(deptype="test")
-                    for test_dependency in test_deps:
+                    test_edges = node.edges_to_dependencies(deptype="test")
+                    for current_edge in test_edges:
+                        test_dependency = current_edge.spec
                         if test_dependency in current_spec[node.name]:
                             continue
                         current_spec[node.name].add_dependency_edge(
-                            test_dependency.copy(), deptypes="test"
+                            test_dependency.copy(), deptypes="test", virtuals=current_edge.virtuals
                         )
 
         results = [
@@ -1806,17 +1780,29 @@ def _add_concrete_spec(self, spec, concrete, new=True):
         self.specs_by_hash[h] = concrete
 
     def _get_overwrite_specs(self):
-        # Collect all specs in the environment first before checking which ones
-        # to rebuild to avoid checking the same specs multiple times
-        specs_to_check = set()
-        for dag_hash in self.concretized_order:
-            root_spec = self.specs_by_hash[dag_hash]
-            specs_to_check.update(root_spec.traverse(root=True))
-
-        changed_dev_specs = set(s for s in specs_to_check if _is_dev_spec_and_has_changed(s))
+        # Find all dev specs that were modified.
+        changed_dev_specs = [
+            s
+            for s in traverse.traverse_nodes(
+                self.concrete_roots(), order="breadth", key=traverse.by_dag_hash
+            )
+            if _is_dev_spec_and_has_changed(s)
+        ]
 
+        # Collect their hashes, and the hashes of their installed parents.
+        # Notice: with order=breadth all changed dev specs are at depth 0,
+        # even if they occur as parents of one another.
         return [
-            s.dag_hash() for s in specs_to_check if _spec_needs_overwrite(s, changed_dev_specs)
+            spec.dag_hash()
+            for depth, spec in traverse.traverse_nodes(
+                changed_dev_specs,
+                root=True,
+                order="breadth",
+                depth=True,
+                direction="parents",
+                key=traverse.by_dag_hash,
+            )
+            if depth == 0 or spec.installed
         ]
 
     def _install_log_links(self, spec):
@@ -1923,7 +1909,7 @@ def install_specs(self, specs=None, **install_args):
     def all_specs(self):
         """Return all specs, even those a user spec would shadow."""
         roots = [self.specs_by_hash[h] for h in self.concretized_order]
-        specs = [s for s in spack.traverse.traverse_nodes(roots, lambda s: s.dag_hash())]
+        specs = [s for s in traverse.traverse_nodes(roots, key=traverse.by_dag_hash)]
         specs.sort()
         return specs
 
@@ -1969,13 +1955,18 @@ def concrete_roots(self):
         roots *without* associated user spec"""
         return [root for _, root in self.concretized_specs()]
 
-    def get_by_hash(self, dag_hash):
-        matches = {}
-        roots = [self.specs_by_hash[h] for h in self.concretized_order]
-        for spec in spack.traverse.traverse_nodes(roots, key=lambda s: s.dag_hash()):
+    def get_by_hash(self, dag_hash: str) -> List[Spec]:
+        # If it's not a partial hash prefix we can early exit
+        early_exit = len(dag_hash) == 32
+        matches = []
+        for spec in traverse.traverse_nodes(
+            self.concrete_roots(), key=traverse.by_dag_hash, order="breadth"
+        ):
             if spec.dag_hash().startswith(dag_hash):
-                matches[spec.dag_hash()] = spec
-        return list(matches.values())
+                matches.append(spec)
+                if early_exit:
+                    break
+        return matches
 
     def get_one_by_hash(self, dag_hash):
         """Returns the single spec from the environment which matches the
@@ -1987,11 +1978,14 @@ def get_one_by_hash(self, dag_hash):
 
     def all_matching_specs(self, *specs: spack.spec.Spec) -> List[Spec]:
         """Returns all concretized specs in the environment satisfying any of the input specs"""
-        key = lambda s: s.dag_hash()
+        # Look up abstract hashes ahead of time, to avoid O(n^2) traversal.
+        specs = [s.lookup_hash() for s in specs]
+
+        # Avoid double lookup by directly calling _satisfies.
         return [
             s
-            for s in spack.traverse.traverse_nodes(self.concrete_roots(), key=key)
-            if any(s.satisfies(t) for t in specs)
+            for s in traverse.traverse_nodes(self.concrete_roots(), key=traverse.by_dag_hash)
+            if any(s._satisfies(t) for t in specs)
         ]
 
     @spack.repo.autospec
@@ -2015,9 +2009,9 @@ def matching_spec(self, spec):
         env_root_to_user = {root.dag_hash(): user for user, root in self.concretized_specs()}
         root_matches, dep_matches = [], []
 
-        for env_spec in spack.traverse.traverse_nodes(
+        for env_spec in traverse.traverse_nodes(
             specs=[root for _, root in self.concretized_specs()],
-            key=lambda s: s.dag_hash(),
+            key=traverse.by_dag_hash,
             order="breadth",
         ):
             if not env_spec.satisfies(spec):
@@ -2091,8 +2085,8 @@ def _get_environment_specs(self, recurse_dependencies=True):
 
         if recurse_dependencies:
             specs.extend(
-                spack.traverse.traverse_nodes(
-                    specs, root=False, deptype=("link", "run"), key=lambda s: s.dag_hash()
+                traverse.traverse_nodes(
+                    specs, root=False, deptype=("link", "run"), key=traverse.by_dag_hash
                 )
             )
 
@@ -2101,9 +2095,7 @@ def _get_environment_specs(self, recurse_dependencies=True):
     def _to_lockfile_dict(self):
         """Create a dictionary to store a lockfile for this environment."""
         concrete_specs = {}
-        for s in spack.traverse.traverse_nodes(
-            self.specs_by_hash.values(), key=lambda s: s.dag_hash()
-        ):
+        for s in traverse.traverse_nodes(self.specs_by_hash.values(), key=traverse.by_dag_hash):
             spec_dict = s.node_dict_with_hashes(hash=ht.dag_hash)
             # Assumes no legacy formats, since this was just created.
             spec_dict[ht.dag_hash.name] = s.dag_hash()
@@ -2184,9 +2176,9 @@ def _read_lockfile_dict(self, d):
         # and add them to the spec
         for lockfile_key, node_dict in json_specs_by_hash.items():
             name, data = reader.name_and_data(node_dict)
-            for _, dep_hash, deptypes, _ in reader.dependencies_from_node_dict(data):
+            for _, dep_hash, deptypes, _, virtuals in reader.dependencies_from_node_dict(data):
                 specs_by_hash[lockfile_key]._add_dependency(
-                    specs_by_hash[dep_hash], deptypes=deptypes
+                    specs_by_hash[dep_hash], deptypes=deptypes, virtuals=virtuals
                 )
 
         # Traverse the root specs one at a time in the order they appear.
@@ -2260,7 +2252,7 @@ def ensure_env_directory_exists(self, dot_env: bool = False) -> None:
 
     def update_environment_repository(self) -> None:
         """Updates the repository associated with the environment."""
-        for spec in spack.traverse.traverse_nodes(self.new_specs):
+        for spec in traverse.traverse_nodes(self.new_specs):
             if not spec.concrete:
                 raise ValueError("specs passed to environment.write() must be concrete!")
 

lib/spack/spack/environment/shell.py

@@ -42,6 +42,8 @@ def activate_header(env, shell, prompt=None):
         cmds += 'set "SPACK_ENV=%s"\n' % env.path
         # TODO: despacktivate
         # TODO: prompt
+    elif shell == "pwsh":
+        cmds += "$Env:SPACK_ENV=%s\n" % env.path
     else:
         if "color" in os.getenv("TERM", "") and prompt:
             prompt = colorize("@G{%s}" % prompt, color=True, enclose=True)
@@ -79,6 +81,8 @@ def deactivate_header(shell):
         cmds += 'set "SPACK_ENV="\n'
         # TODO: despacktivate
         # TODO: prompt
+    elif shell == "pwsh":
+        cmds += "Remove-Item Env:SPACK_ENV"
     else:
         cmds += "if [ ! -z ${SPACK_ENV+x} ]; then\n"
         cmds += "unset SPACK_ENV; export SPACK_ENV;\n"

lib/spack/spack/error.py

@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from __future__ import print_function
-
 import inspect
 import sys
 
@@ -21,7 +19,7 @@ class SpackError(Exception):
     """
 
     def __init__(self, message, long_message=None):
-        super(SpackError, self).__init__()
+        super().__init__()
         self.message = message
         self._long_message = long_message
 
@@ -93,14 +91,14 @@ class UnsupportedPlatformError(SpackError):
     """Raised by packages when a platform is not supported"""
 
     def __init__(self, message):
-        super(UnsupportedPlatformError, self).__init__(message)
+        super().__init__(message)
 
 
 class NoLibrariesError(SpackError):
     """Raised when package libraries are requested but cannot be found"""
 
     def __init__(self, message_or_name, prefix=None):
-        super(NoLibrariesError, self).__init__(
+        super().__init__(
             message_or_name
             if prefix is None
             else "Unable to locate {0} libraries in {1}".format(message_or_name, prefix)
@@ -125,9 +123,7 @@ class UnsatisfiableSpecError(SpecError):
 
     def __init__(self, provided, required, constraint_type):
         # This is only the entrypoint for old concretizer errors
-        super(UnsatisfiableSpecError, self).__init__(
-            "%s does not satisfy %s" % (provided, required)
-        )
+        super().__init__("%s does not satisfy %s" % (provided, required))
 
         self.provided = provided
         self.required = required

lib/spack/spack/extensions.py

@@ -176,7 +176,7 @@ class CommandNotFoundError(spack.error.SpackError):
     """
 
     def __init__(self, cmd_name):
-        super(CommandNotFoundError, self).__init__(
+        super().__init__(
             "{0} is not a recognized Spack command or extension command;"
             " check with `spack commands`.".format(cmd_name)
         )
@@ -188,6 +188,4 @@ class ExtensionNamingError(spack.error.SpackError):
     """
 
     def __init__(self, path):
-        super(ExtensionNamingError, self).__init__(
-            "{0} does not match the format for a Spack extension path.".format(path)
-        )
+        super().__init__("{0} does not match the format for a Spack extension path.".format(path))

lib/spack/spack/fetch_strategy.py

@@ -93,7 +93,7 @@ def fetcher(cls):
     return cls
 
 
-class FetchStrategy(object):
+class FetchStrategy:
     """Superclass of all fetch strategies."""
 
     #: The URL attribute must be specified either at the package class
@@ -234,9 +234,7 @@ class FetchStrategyComposite(pattern.Composite):
     matches = FetchStrategy.matches
 
     def __init__(self):
-        super(FetchStrategyComposite, self).__init__(
-            ["fetch", "check", "expand", "reset", "archive", "cachable", "mirror_id"]
-        )
+        super().__init__(["fetch", "check", "expand", "reset", "archive", "cachable", "mirror_id"])
 
     def source_id(self):
         component_ids = tuple(i.source_id() for i in self)
@@ -263,7 +261,7 @@ class URLFetchStrategy(FetchStrategy):
     optional_attrs = list(crypto.hashes.keys()) + ["checksum"]
 
     def __init__(self, url=None, checksum=None, **kwargs):
-        super(URLFetchStrategy, self).__init__(**kwargs)
+        super().__init__(**kwargs)
 
         # Prefer values in kwargs to the positionals.
         self.url = kwargs.get("url", url)
@@ -580,7 +578,7 @@ class VCSFetchStrategy(FetchStrategy):
     """
 
     def __init__(self, **kwargs):
-        super(VCSFetchStrategy, self).__init__(**kwargs)
+        super().__init__(**kwargs)
 
         # Set a URL based on the type of fetch strategy.
         self.url = kwargs.get(self.url_attr, None)
@@ -652,7 +650,7 @@ def __init__(self, **kwargs):
         # call to __init__
         forwarded_args = copy.copy(kwargs)
         forwarded_args.pop("name", None)
-        super(GoFetchStrategy, self).__init__(**forwarded_args)
+        super().__init__(**forwarded_args)
 
         self._go = None
 
@@ -681,7 +679,7 @@ def fetch(self):
             self.go("get", "-v", "-d", self.url, env=env)
 
     def archive(self, destination):
-        super(GoFetchStrategy, self).archive(destination, exclude=".git")
+        super().archive(destination, exclude=".git")
 
     @_needs_stage
     def expand(self):
@@ -740,7 +738,7 @@ def __init__(self, **kwargs):
         # to __init__
         forwarded_args = copy.copy(kwargs)
         forwarded_args.pop("name", None)
-        super(GitFetchStrategy, self).__init__(**forwarded_args)
+        super().__init__(**forwarded_args)
 
         self._git = None
         self.submodules = kwargs.get("submodules", False)
@@ -948,7 +946,7 @@ def clone(self, dest=None, commit=None, branch=None, tag=None, bare=False):
                 git(*args)
 
     def archive(self, destination):
-        super(GitFetchStrategy, self).archive(destination, exclude=".git")
+        super().archive(destination, exclude=".git")
 
     @_needs_stage
     def reset(self):
@@ -997,7 +995,7 @@ def __init__(self, **kwargs):
         # to __init__
         forwarded_args = copy.copy(kwargs)
         forwarded_args.pop("name", None)
-        super(CvsFetchStrategy, self).__init__(**forwarded_args)
+        super().__init__(**forwarded_args)
 
         self._cvs = None
         if self.branch is not None:
@@ -1077,7 +1075,7 @@ def _remove_untracked_files(self):
                         os.unlink(path)
 
     def archive(self, destination):
-        super(CvsFetchStrategy, self).archive(destination, exclude="CVS")
+        super().archive(destination, exclude="CVS")
 
     @_needs_stage
     def reset(self):
@@ -1113,7 +1111,7 @@ def __init__(self, **kwargs):
         # to __init__
         forwarded_args = copy.copy(kwargs)
         forwarded_args.pop("name", None)
-        super(SvnFetchStrategy, self).__init__(**forwarded_args)
+        super().__init__(**forwarded_args)
 
         self._svn = None
         if self.revision is not None:
@@ -1172,7 +1170,7 @@ def _remove_untracked_files(self):
                     shutil.rmtree(path, ignore_errors=True)
 
     def archive(self, destination):
-        super(SvnFetchStrategy, self).archive(destination, exclude=".svn")
+        super().archive(destination, exclude=".svn")
 
     @_needs_stage
     def reset(self):
@@ -1216,7 +1214,7 @@ def __init__(self, **kwargs):
         # to __init__
         forwarded_args = copy.copy(kwargs)
         forwarded_args.pop("name", None)
-        super(HgFetchStrategy, self).__init__(**forwarded_args)
+        super().__init__(**forwarded_args)
 
         self._hg = None
 
@@ -1277,7 +1275,7 @@ def fetch(self):
             shutil.move(repo_name, self.stage.source_path)
 
     def archive(self, destination):
-        super(HgFetchStrategy, self).archive(destination, exclude=".hg")
+        super().archive(destination, exclude=".hg")
 
     @_needs_stage
     def reset(self):
@@ -1306,7 +1304,7 @@ class S3FetchStrategy(URLFetchStrategy):
 
     def __init__(self, *args, **kwargs):
         try:
-            super(S3FetchStrategy, self).__init__(*args, **kwargs)
+            super().__init__(*args, **kwargs)
         except ValueError:
             if not kwargs.get("url"):
                 raise ValueError("S3FetchStrategy requires a url for fetching.")
@@ -1353,7 +1351,7 @@ class GCSFetchStrategy(URLFetchStrategy):
 
     def __init__(self, *args, **kwargs):
         try:
-            super(GCSFetchStrategy, self).__init__(*args, **kwargs)
+            super().__init__(*args, **kwargs)
         except ValueError:
             if not kwargs.get("url"):
                 raise ValueError("GCSFetchStrategy requires a url for fetching.")
@@ -1652,7 +1650,7 @@ def from_list_url(pkg):
             tty.msg("Could not determine url from list_url.")
 
 
-class FsCache(object):
+class FsCache:
     def __init__(self, root):
         self.root = os.path.abspath(root)
 
@@ -1686,7 +1684,7 @@ class FailedDownloadError(web_util.FetchError):
     """Raised when a download fails."""
 
     def __init__(self, url, msg=""):
-        super(FailedDownloadError, self).__init__("Failed to fetch file from URL: %s" % url, msg)
+        super().__init__("Failed to fetch file from URL: %s" % url, msg)
         self.url = url
 
 
@@ -1716,7 +1714,7 @@ def __init__(self, pkg=None, version=None, **args):
             if version:
                 msg += "@{version}".format(version=version)
         long_msg = "with arguments: {args}".format(args=args)
-        super(InvalidArgsError, self).__init__(msg, long_msg)
+        super().__init__(msg, long_msg)
 
 
 class ChecksumError(web_util.FetchError):
@@ -1727,6 +1725,4 @@ class NoStageError(web_util.FetchError):
     """Raised when fetch operations are called before set_stage()."""
 
     def __init__(self, method):
-        super(NoStageError, self).__init__(
-            "Must call FetchStrategy.set_stage() before calling %s" % method.__name__
-        )
+        super().__init__("Must call FetchStrategy.set_stage() before calling %s" % method.__name__)

lib/spack/spack/filesystem_view.py

@@ -126,7 +126,7 @@ def inverse_view_func_parser(view_type):
     return link_name
 
 
-class FilesystemView(object):
+class FilesystemView:
     """
     Governs a filesystem view that is located at certain root-directory.
 
@@ -255,7 +255,7 @@ class YamlFilesystemView(FilesystemView):
     """
 
     def __init__(self, root, layout, **kwargs):
-        super(YamlFilesystemView, self).__init__(root, layout, **kwargs)
+        super().__init__(root, layout, **kwargs)
 
         # Super class gets projections from the kwargs
         # YAML specific to get projections from YAML file
@@ -637,7 +637,7 @@ class SimpleFilesystemView(FilesystemView):
     were added."""
 
     def __init__(self, root, layout, **kwargs):
-        super(SimpleFilesystemView, self).__init__(root, layout, **kwargs)
+        super().__init__(root, layout, **kwargs)
 
     def _sanity_check_view_projection(self, specs):
         """A very common issue is that we end up with two specs of the same

lib/spack/spack/graph.py

@@ -544,6 +544,7 @@ def _static_edges(specs, deptype):
                     spack.spec.Spec(parent_name),
                     spack.spec.Spec(dependency_name),
                     deptypes=deptype,
+                    virtuals=(),
                 )
 
 

lib/spack/spack/hash_types.py

@@ -10,7 +10,7 @@
 hashes = []
 
 
-class SpecHashDescriptor(object):
+class SpecHashDescriptor:
     """This class defines how hashes are generated on Spec objects.
 
     Spec hashes in Spack are generated from a serialized (e.g., with