69 lines
2.9 KiB
Nix
69 lines
2.9 KiB
Nix
{ 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 prepares checkpoint builds by provinding,
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* containing the build output and the sources for cross checking.
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* The build output can be used later to allow checkpoint builds
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* by passing the derivation output to the `mkCheckpointBuild` function.
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*
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* To build a project with checkpoints follow these steps:
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* - run prepareIncrementalBuild on the desired derivation
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* e.G `incrementalBuildArtifacts = (pkgs.checkpointBuildTools.prepareCheckpointBuild pkgs.virtualbox);`
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* - change something you want in the sources of the package( e.G using source override)
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* changedVBox = pkgs.virtuabox.overrideAttrs (old: {
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* src = path/to/vbox/sources;
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* }
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* - use `mkCheckpointedBuild changedVBox buildOutput`
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* - enjoy shorter build times
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*/
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prepareCheckpointBuild = drv: drv.overrideAttrs (old: {
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outputs = [ "out" ];
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name = drv.name + "-checkpointArtifacts";
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# To determine differences between the state of the build directory
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# from an earlier build and a later one we store the state of the build
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# directory before build, but after patch phases.
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# This way, the same derivation can be used multiple times and only changes are detected.
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# Additionally Removed files are handled correctly in later builds.
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preBuild = (old.preBuild or "") + ''
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mkdir -p $out/sources
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cp -r ./* $out/sources/
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'';
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# After the build the build directory is copied again
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# to get the output files.
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# We copy the complete build folder, to take care for
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# Build tools, building in the source directory, instead of
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# having a build root directory, e.G the Linux kernel.
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installPhase = ''
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runHook preCheckpointInstall
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mkdir -p $out/outputs
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cp -r ./* $out/outputs/
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runHook postCheckpointInstall
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'';
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});
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/* Build a derivation based on the checkpoint output generated by
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* the `prepareCheckpointBuild function.
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*
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* Usage:
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* let
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* checkpointArtifacts = prepareCheckpointBuild drv
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* in mkCheckpointedBuild drv checkpointArtifacts
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*/
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mkCheckpointedBuild = drv: previousBuildArtifacts: drv.overrideAttrs (old: {
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# The actual checkpoint build phase.
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# We compare the changed sources from a previous build with the current and create a patch
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# Afterwards we clean the build directory to copy the previous output files (Including the sources)
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# The source difference patch is applied to get the latest changes again to allow short build times.
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preBuild = (old.preBuild or "") + ''
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set +e
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diff -ur ${previousBuildArtifacts}/sources ./ > sourceDifference.patch
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set -e
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shopt -s extglob dotglob
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rm -r !("sourceDifference.patch")
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${pkgs.rsync}/bin/rsync -cutU --chown=$USER:$USER --chmod=+w -r ${previousBuildArtifacts}/outputs/* .
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patch -p 1 -i sourceDifference.patch
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'';
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});
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}
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