38 lines
1.3 KiB
Nix
38 lines
1.3 KiB
Nix
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{ pkgs }:
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rec {
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/* Prepare a derivation for local builds.
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*
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* This function adds an additional outout for a derivation,
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* containing the build output.
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* The build output can be used later to allow incremental builds
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* by passing the `buildOut` output to the `mkIncrementalBuild` function.
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*/
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prepareIncrementalBuild = drv: drv.overrideAttrs (old: {
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outputs = (old.outputs or [ "out" ]) ++ [ "buildOut" ];
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installPhase = pkgs.lib.optionalString (!(builtins.hasAttr "outputs" old)) ''
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mkdir -p $out
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'' + (old.installPhase or "") + ''
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mkdir -p $buildOut
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cp -r ./* $buildOut/
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'';
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});
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/* Build a derivation incrementally based on the output generated by
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* the `prepareIncrementalBuild function.
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*
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* Usage:
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* let
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* buildOutput = (prepareIncrementalBuild drv).buildOut
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* in mkIncrementalBuild drv buildOutput
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*/
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mkIncrementalBuild = drv: previousBuildArtifacts: drv.overrideAttrs (old: {
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prePatch = ''
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for file in $(diff -r ./ ${previousBuildArtifacts} --brief | grep "Files" |sed 's/^Only in \([^:]*\): /\1\//' | sed 's/^Files \(.*\) and .* differ/\1/')
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do
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touch $file
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done
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${pkgs.rsync}/bin/rsync -cutU --chown=$USER:$USER --chmod=+w -r ${previousBuildArtifacts}/* .
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'' + (old.prePatch or "");
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});
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}
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