110 lines
3.3 KiB
Bash
110 lines
3.3 KiB
Bash
# shellcheck shell=bash
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# Setup hook that modifies Python dependencies versions.
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#
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# Example usage in a derivation:
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#
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# { …, pythonPackages, … }:
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#
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# pythonPackages.buildPythonPackage {
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# …
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# nativeBuildInputs = [ pythonPackages.pythonRelaxDepsHook ];
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#
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# # This will relax the dependency restrictions
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# # e.g.: abc>1,<=2 -> abc
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# pythonRelaxDeps = [ "abc" ];
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# # This will relax all dependencies restrictions instead
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# # pythonRelaxDeps = true;
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# # This will remove the dependency
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# # e.g.: cde>1,<=2 -> <nothing>
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# pythonRemoveDeps = [ "cde" ];
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# # This will remove all dependencies from the project
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# # pythonRemoveDeps = true;
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# …
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# }
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#
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# IMPLEMENTATION NOTES:
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#
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# The "Requires-Dist" dependency specification format is described in PEP 508.
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# Examples that the regular expressions in this hook needs to support:
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#
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# Requires-Dist: foo
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# -> foo
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# Requires-Dist: foo[optional]
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# -> foo[optional]
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# Requires-Dist: foo[optional]~=1.2.3
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# -> foo[optional]
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# Requires-Dist: foo[optional, xyz] (~=1.2.3)
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# -> foo[optional, xyz]
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# Requires-Dist: foo[optional]~=1.2.3 ; os_name = "posix"
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# -> foo[optional] ; os_name = "posix"
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#
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# Currently unsupported: URL specs (foo @ https://example.com/a.zip).
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_pythonRelaxDeps() {
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local -r metadata_file="$1"
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if [[ -z "${pythonRelaxDeps:-}" ]] || [[ "$pythonRelaxDeps" == 0 ]]; then
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return
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elif [[ "$pythonRelaxDeps" == 1 ]]; then
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sed -i "$metadata_file" -r \
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-e 's/(Requires-Dist: [a-zA-Z0-9_.-]+\s*(\[[^]]+\])?)[^;]*(;.*)?/\1\3/'
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else
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for dep in $pythonRelaxDeps; do
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sed -i "$metadata_file" -r \
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-e "s/(Requires-Dist: $dep\s*(\[[^]]+\])?)[^;]*(;.*)?/\1\3/"
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done
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fi
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}
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_pythonRemoveDeps() {
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local -r metadata_file="$1"
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if [[ -z "${pythonRemoveDeps:-}" ]] || [[ "$pythonRemoveDeps" == 0 ]]; then
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return
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elif [[ "$pythonRemoveDeps" == 1 ]]; then
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sed -i "$metadata_file" \
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-e '/Requires-Dist:.*/d'
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else
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for dep in $pythonRemoveDeps; do
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sed -i "$metadata_file" \
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-e "/Requires-Dist: $dep/d"
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done
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fi
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}
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pythonRelaxDepsHook() {
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pushd dist
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# See https://peps.python.org/pep-0491/#escaping-and-unicode
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local -r pkg_name="${pname//[^[:alnum:].]/_}"
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local -r unpack_dir="unpacked"
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local -r metadata_file="$unpack_dir/$pkg_name*/$pkg_name*.dist-info/METADATA"
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# We generally shouldn't have multiple wheel files, but let's be safer here
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for wheel in "$pkg_name"*".whl"; do
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PYTHONPATH="@wheel@/@pythonSitePackages@:$PYTHONPATH" \
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@pythonInterpreter@ -m wheel unpack --dest "$unpack_dir" "$wheel"
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rm -rf "$wheel"
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# Using no quotes on purpose since we need to expand the glob from `$metadata_file`
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_pythonRelaxDeps $metadata_file
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_pythonRemoveDeps $metadata_file
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if (( "${NIX_DEBUG:-0}" >= 1 )); then
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echo "pythonRelaxDepsHook: resulting METADATA for '$wheel':"
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cat $metadata_file
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fi
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PYTHONPATH="@wheel@/@pythonSitePackages@:$PYTHONPATH" \
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@pythonInterpreter@ -m wheel pack "$unpack_dir/$pkg_name"*
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done
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# Remove the folder since it will otherwise be in the dist output.
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rm -rf "$unpack_dir"
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popd
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}
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postBuild+=" pythonRelaxDepsHook"
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