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35 lines
995 B
Nix
35 lines
995 B
Nix
# This derivation builds two files containing information about the
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# closure of 'rootPaths': $out/store-paths contains the paths in the
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# closure, and $out/registration contains a file suitable for use with
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# "nix-store --load-db" and "nix-store --register-validity
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# --hash-given".
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{ stdenv, coreutils, jq }:
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{ rootPaths }:
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assert builtins.langVersion >= 5;
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stdenv.mkDerivation {
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name = "closure-info";
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__structuredAttrs = true;
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exportReferencesGraph.closure = rootPaths;
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PATH = "${coreutils}/bin:${jq}/bin";
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builder = builtins.toFile "builder"
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''
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if [ -e .attrs.sh ]; then . .attrs.sh; fi
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out=''${outputs[out]}
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mkdir $out
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jq -r ".closure | map(.narSize) | add" < .attrs.json > $out/total-nar-size
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jq -r '.closure | map([.path, .narHash, .narSize, "", (.references | length)] + .references) | add | map("\(.)\n") | add' < .attrs.json | head -n -1 > $out/registration
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jq -r .closure[].path < .attrs.json > $out/store-paths
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'';
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}
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