New package: git-annex (#24721)

var/spack/repos/builtin/packages/git-annex/package.py

@@ -0,0 +1,79 @@
+# Copyright 2013-2021 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)
+
+import os
+import platform
+import re
+
+from spack import *
+
+
+class GitAnnex(Package):
+    """
+    git-annex allows managing files with git, without checking the file
+    contents into git. While that may seem paradoxical, it is useful when
+    dealing with files larger than git can currently easily handle, whether
+    due to limitations in memory, time, or disk space.
+    """
+
+    homepage = "https://git-annex.branchable.com"
+
+    # git-annex is written in Haskell which is currently not supported in
+    # spack, thus a similar approach as in the pandoc package was chosen. The
+    # following installs the standalone binaries for git-annex.
+
+    # git-annex does not use download links encoding the version but updates
+    # the "current" standalone file and keeps track of the version via
+    # git-annex itself
+    #
+    # Steps to find the static link e.g. for amd64:
+    # - $ git clone https://downloads.kitenet.net/.git/
+    # - $ ls -la git-annex/linux/current/
+    #       gives for example for amd64
+    #       ../../../.git/annex/objects/KM/Ff/SHA256E-s51276461--a1cef631ef2cc0c977580eacaa1294d7617727df99214920ca6e8f3172bae03e.tar.gz/SHA256E-s51276461--a1cef631ef2cc0c977580eacaa1294d7617727df99214920ca6e8f3172bae03e.tar.gz
+    # - exchange "../../../" with "https://downloads.kitenet.net" and you have the link
+    # the version to the link can be found in
+    # git-annex/linux/current/git-annex-standalone-amd64.tar.gz.info
+    # Caution: the version on the webpage
+    # (meaning here: https://downloads.kitenet.net/git-annex/linux/current/) is
+    # broken and always behind
+
+    if platform.system() == "Linux" and platform.machine() == "aarch64":
+        version('8.20210622', sha256='869f875e280db0cc3243d9d0d33492f1c3bc182053544c1d5eb0ec463125fe76',
+                url="https://downloads.kitenet.net/.git/annex/objects/MJ/p3/SHA256E-s55109776--869f875e280db0cc3243d9d0d33492f1c3bc182053544c1d5eb0ec463125fe76.tar.gz/SHA256E-s55109776--869f875e280db0cc3243d9d0d33492f1c3bc182053544c1d5eb0ec463125fe76.tar.gz")
+
+    elif platform.system() == "Linux":
+        version('8.20210622', sha256='a1cef631ef2cc0c977580eacaa1294d7617727df99214920ca6e8f3172bae03e',
+                url="https://downloads.kitenet.net/.git/annex/objects/KM/Ff/SHA256E-s51276461--a1cef631ef2cc0c977580eacaa1294d7617727df99214920ca6e8f3172bae03e.tar.gz/SHA256E-s51276461--a1cef631ef2cc0c977580eacaa1294d7617727df99214920ca6e8f3172bae03e.tar.gz")
+
+    variant('standalone', default=False,
+            description='Install git-annex fully standalone incl. git')
+
+    depends_on('git', when='~standalone')
+
+    conflicts('platform=darwin', msg='Darwin is not supported.')
+    conflicts('platform=windows', msg='Windows is not supported.')
+
+    executables = ['^git-annex$']
+
+    @classmethod
+    def determine_version(cls, exe):
+        output = Executable(exe)('version', output=str, error=str)
+        match = re.search(r'git-annex version: ([0-9.]+)', output)
+        if not match:
+            return None
+        version = match.group(1)
+        return version
+
+    def install(self, spec, prefix):
+        install_tree('.', prefix.bin)
+
+        if '~standalone' in spec:
+            # use git provided by spack instead of the one in the package
+            git_files = ['git', 'git-receive-pack', 'git-shell', 'git-upload-pack']
+            for i in git_files:
+                os.remove(join_path(prefix.bin, i))
+                os.symlink(join_path(spec['git'].prefix.bin, i),
+                           join_path(prefix.bin, i))