43 lines
1.1 KiB
Nix
43 lines
1.1 KiB
Nix
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# 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 $out/registration contains a file suitable for use with
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# "nix-store --load-db" and "nix-store --register-validity
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# --hash-given".
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{ stdenv, coreutils, jq }:
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{ rootPaths }:
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assert builtins.langVersion >= 5;
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stdenv.mkDerivation {
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name = "closure-info";
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__structuredAttrs = true;
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exportReferencesGraph.closure = rootPaths;
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preferLocalBuild = true;
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nativeBuildInputs = [ coreutils jq ];
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empty = rootPaths == [];
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buildCommand =
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''
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out=''${outputs[out]}
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mkdir $out
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if [[ -n "$empty" ]]; then
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echo 0 > $out/total-nar-size
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touch $out/registration $out/store-paths
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else
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jq -r ".closure | map(.narSize) | add" < "$NIX_ATTRS_JSON_FILE" > $out/total-nar-size
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jq -r '.closure | map([.path, .narHash, .narSize, "", (.references | length)] + .references) | add | map("\(.)\n") | add' < "$NIX_ATTRS_JSON_FILE" | head -n -1 > $out/registration
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jq -r '.closure[].path' < "$NIX_ATTRS_JSON_FILE" > $out/store-paths
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fi
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'';
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}
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