[pcluster pipeline] Use local buildcache instead of upstream spack

Spack currently does not relocate compiler references from upstream spack
installations. When using a buildcache we don't need an upstream spack.

share/spack/gitlab/cloud_pipelines/.gitlab-ci.yml

@@ -792,16 +792,14 @@ deprecated-ci-build:
 
 .aws-pcluster-generate:
   before_script:
-      # Setup postinstall Spack as upstream installation
+    # Use gcc from local container buildcache
     - - . "./share/spack/setup-env.sh"
       - . /etc/profile.d/modules.sh
-      - if [[ -f /bootstrap/spack/etc/spack/packages.yaml ]]; then cp /bootstrap/spack/etc/spack/packages.yaml ./etc/spack/; fi
-      - if [[ -f /bootstrap/spack/etc/spack/config.yaml ]]; then cp /bootstrap/spack/etc/spack/config.yaml ./etc/spack/; fi
-      - if [[ -f /bootstrap/spack/etc/spack/modules.xyaml ]]; then cp /bootstrap/spack/etc/spack/modules.yaml ./etc/spack/; fi
-      - if [[ -f /bootstrap/spack/etc/spack/mirrors.yaml ]]; then cp /bootstrap/spack/etc/spack/mirrors.yaml ./etc/spack/; fi
-      - if [[ -d /bootstrap/spack/opt/spack ]]; then spack config add "upstreams:postinstall:install_tree:/bootstrap/spack/opt/spack"; fi
+      - spack mirror add local-cache /bootstrap/local-cache
+      - spack gpg trust /bootstrap/public-key
+      - spack install --cache-only $(spack buildcache list gcc | tail -n1)
       - cd "${CI_PROJECT_DIR}" && curl -sOL https://raw.githubusercontent.com/spack/spack-configs/main/AWS/parallelcluster/postinstall.sh
-      - sed -i -e '/nohup/s/&$//' -e 's/nohup//' -e "s/spack arch -t/echo ${SPACK_TARGET_ARCH}/g" postinstall.sh
+      - sed -i -e "s/spack arch -t/echo ${SPACK_TARGET_ARCH}/g" postinstall.sh
       - /bin/bash postinstall.sh -fg
       - spack config --scope site add "packages:all:target:\"target=${SPACK_TARGET_ARCH}\""
   after_script:

share/spack/gitlab/cloud_pipelines/stacks/aws-pcluster-icelake/spack.yaml

@@ -41,12 +41,10 @@ spack:
           - . /etc/profile.d/modules.sh
           - spack --version
           - spack arch
-        # Setup postinstall Spack as upstream installation
-        - - if [[ -f /bootstrap/spack/etc/spack/packages.yaml ]]; then cp /bootstrap/spack/etc/spack/packages.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/config.yaml ]]; then cp /bootstrap/spack/etc/spack/config.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/modules.yaml ]]; then cp /bootstrap/spack/etc/spack/modules.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/mirrors.yaml ]]; then cp /bootstrap/spack/etc/spack/mirrors.yaml ./etc/spack/; fi
-          - if [[ -d /bootstrap/spack/opt/spack ]]; then spack config add "upstreams:postinstall:install_tree:/bootstrap/spack/opt/spack"; fi
+        # Use gcc from local container buildcache
+        - - spack mirror add local-cache /bootstrap/local-cache
+          - spack gpg trust /bootstrap/public-key
+          - spack install --cache-only $(spack buildcache list gcc | tail -n1)
         - - /bin/bash "${SPACK_ARTIFACTS_ROOT}/postinstall.sh" -fg
           - spack config --scope site add "packages:all:target:\"target=${SPACK_TARGET_ARCH}\""
     - signing-job:

share/spack/gitlab/cloud_pipelines/stacks/aws-pcluster-neoverse_n1/spack.yaml

@@ -43,12 +43,10 @@ spack:
           - . /etc/profile.d/modules.sh
           - spack --version
           - spack arch
-        # Setup postinstall Spack as upstream installation
-        - - if [[ -f /bootstrap/spack/etc/spack/packages.yaml ]]; then cp /bootstrap/spack/etc/spack/packages.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/config.yaml ]]; then cp /bootstrap/spack/etc/spack/config.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/modules.yaml ]]; then cp /bootstrap/spack/etc/spack/modules.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/mirrors.yaml ]]; then cp /bootstrap/spack/etc/spack/mirrors.yaml ./etc/spack/; fi
-          - if [[ -d /bootstrap/spack/opt/spack ]]; then spack config add "upstreams:postinstall:install_tree:/bootstrap/spack/opt/spack"; fi
+        # Use gcc from local container buildcache
+        - - spack mirror add local-cache /bootstrap/local-cache
+          - spack gpg trust /bootstrap/public-key
+          - spack install --cache-only $(spack buildcache list gcc | tail -n1)
         - - /bin/bash "${SPACK_ARTIFACTS_ROOT}/postinstall.sh" -fg
           - spack config --scope site add "packages:all:target:\"target=${SPACK_TARGET_ARCH}\""
     - signing-job:

share/spack/gitlab/cloud_pipelines/stacks/aws-pcluster-neoverse_v1/spack.yaml

@@ -43,12 +43,10 @@ spack:
           - . /etc/profile.d/modules.sh
           - spack --version
           - spack arch
-        # Setup postinstall Spack as upstream installation
-        - - if [[ -f /bootstrap/spack/etc/spack/packages.yaml ]]; then cp /bootstrap/spack/etc/spack/packages.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/config.yaml ]]; then cp /bootstrap/spack/etc/spack/config.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/modules.yaml ]]; then cp /bootstrap/spack/etc/spack/modules.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/mirrors.yaml ]]; then cp /bootstrap/spack/etc/spack/mirrors.yaml ./etc/spack/; fi
-          - if [[ -d /bootstrap/spack/opt/spack ]]; then spack config add "upstreams:postinstall:install_tree:/bootstrap/spack/opt/spack"; fi
+        # Use gcc from local container buildcache
+        - - spack mirror add local-cache /bootstrap/local-cache
+          - spack gpg trust /bootstrap/public-key
+          - spack install --cache-only $(spack buildcache list gcc | tail -n1)
         - - /bin/bash "${SPACK_ARTIFACTS_ROOT}/postinstall.sh" -fg
           - spack config --scope site add "packages:all:target:\"target=${SPACK_TARGET_ARCH}\""
     - signing-job:

share/spack/gitlab/cloud_pipelines/stacks/aws-pcluster-skylake/spack.yaml

@@ -41,12 +41,10 @@ spack:
           - . /etc/profile.d/modules.sh
           - spack --version
           - spack arch
-        # Setup postinstall Spack as upstream installation
-        - - if [[ -f /bootstrap/spack/etc/spack/packages.yaml ]]; then cp /bootstrap/spack/etc/spack/packages.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/config.yaml ]]; then cp /bootstrap/spack/etc/spack/config.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/modules.yaml ]]; then cp /bootstrap/spack/etc/spack/modules.yaml ./etc/spack/; fi
-          - if [[ -f /bootstrap/spack/etc/spack/mirrors.yaml ]]; then cp /bootstrap/spack/etc/spack/mirrors.yaml ./etc/spack/; fi
-          - if [[ -d /bootstrap/spack/opt/spack ]]; then spack config add "upstreams:postinstall:install_tree:/bootstrap/spack/opt/spack"; fi
+        # Use gcc from local container buildcache
+        - - spack mirror add local-cache /bootstrap/local-cache
+          - spack gpg trust /bootstrap/public-key
+          - spack install --cache-only $(spack buildcache list gcc | tail -n1)
         - - /bin/bash "${SPACK_ARTIFACTS_ROOT}/postinstall.sh" -fg
           - spack config --scope site add "packages:all:target:\"target=${SPACK_TARGET_ARCH}\""
     - signing-job: