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# shellcheck shell=bash
# Setup hook that modifies Python dependencies versions.
#
# Example usage in a derivation:
#
# { …, pythonPackages, … }:
#
# pythonPackages.buildPythonPackage {
# …
# nativeBuildInputs = [ pythonPackages.pythonRelaxDepsHook ];
#
# # This will relax the dependency restrictions
# # e.g.: abc>1,<=2 -> abc
# pythonRelaxDeps = [ "abc" ];
# # This will relax all dependencies restrictions instead
# # pythonRelaxDeps = true;
# # This will remove the dependency
# # e.g.: cde>1,<=2 -> <nothing>
# pythonRemoveDeps = [ "cde" ];
# # This will remove all dependencies from the project
# # pythonRemoveDeps = true;
# …
# }
_pythonRelaxDeps() {
local -r metadata_file="$1"
if [[ -z "${pythonRelaxDeps:-}" ]] || [[ "$pythonRelaxDeps" == 0 ]]; then
return
elif [[ "$pythonRelaxDeps" == 1 ]]; then
sed -i "$metadata_file" -r \
-e 's/(Requires-Dist: \S*) \(.*\)/\1/'
else
for dep in $pythonRelaxDeps; do
sed -i "$metadata_file" -r \
-e "s/(Requires-Dist: $dep) \(.*\)/\1/"
done
fi
}
_pythonRemoveDeps() {
local -r metadata_file="$1"
if [[ -z "${pythonRemoveDeps:-}" ]] || [[ "$pythonRemoveDeps" == 0 ]]; then
return
elif [[ "$pythonRemoveDeps" == 1 ]]; then
sed -i "$metadata_file" \
-e '/Requires-Dist:.*/d'
else
for dep in $pythonRemoveDeps; do
sed -i "$metadata_file" \
-e "/Requires-Dist: $dep/d"
done
fi
}
pythonRelaxDepsHook() {
pushd dist
# See https://peps.python.org/pep-0491/#escaping-and-unicode
local -r pkg_name="${pname//[^[:alnum:].]/_}-$version"
local -r unpack_dir="unpacked"
local -r metadata_file="$unpack_dir/$pkg_name/$pkg_name.dist-info/METADATA"
# We generally shouldn't have multiple wheel files, but let's be safer here
for wheel in "$pkg_name"*".whl"; do
@pythonInterpreter@ -m wheel unpack --dest "$unpack_dir" "$wheel"
rm -rf "$wheel"
_pythonRelaxDeps "$metadata_file"
_pythonRemoveDeps "$metadata_file"
if (( "${NIX_DEBUG:-0}" >= 1 )); then
echo "pythonRelaxDepsHook: resulting METADATA for '$wheel':"
cat "$unpack_dir/$pkg_name/$pkg_name.dist-info/METADATA"
fi
@pythonInterpreter@ -m wheel pack "$unpack_dir/$pkg_name"
done
popd
}
postBuild+=" pythonRelaxDepsHook"
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