core/pkgs/build-support/references-by-popularity/default.nix

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{ runCommand, python3, coreutils }:
# Write the references of `path' to a file, in order of how "popular" each
# reference is. Nix 2 only.
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path:
runCommand "closure-paths" {
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exportReferencesGraph.graph = path;
__structuredAttrs = true;
preferLocalBuild = true;
nativeBuildInputs = [ coreutils python3 ];
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} ''
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python3 ${./closure-graph.py} "$NIX_ATTRS_JSON_FILE" graph > ''${outputs[out]}
''