90 lines
3.3 KiB
Nix
90 lines
3.3 KiB
Nix
{ lib
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, buildPackages
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}:
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let
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# rudimentary support for cross-compiling
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# see: https://github.com/NixOS/nixpkgs/pull/279487#discussion_r1444449726
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inherit (buildPackages)
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mktemp
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rsync
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;
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in
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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 storing
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* 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 `prepareCheckpointBuild` on the desired derivation, e.g.
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* checkpointArtifacts = prepareCheckpointBuild virtualbox;
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* - change something you want in the sources of the package,
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* 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 `mkCheckpointBuild changedVBox checkpointArtifacts`
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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 of
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# build tools that build in the source directory, instead of
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# having a separate build directory such as 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 ./* $out/outputs/
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runHook postCheckpointInstall
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'';
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});
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/* Build a derivation based on the checkpoint output generated by
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* the `prepareCheckpointBuild` function.
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*
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* Usage:
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* let
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* checkpointArtifacts = prepareCheckpointBuild drv;
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* in mkCheckpointBuild drv checkpointArtifacts
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*/
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mkCheckpointBuild = drv: checkpointArtifacts: drv.overrideAttrs (old: {
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# The actual checkpoint build phase.
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# We compare the changed sources from a previous build with the current and create a patch.
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# Afterwards we clean the build directory and copy the previous output files (including the sources).
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# The source difference patch is then applied to get the latest changes again to allow short build times.
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preBuild = (old.preBuild or "") + ''
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set +e
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sourceDifferencePatchFile=$(${mktemp}/bin/mktemp)
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diff -ur ${checkpointArtifacts}/sources ./ > "$sourceDifferencePatchFile"
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set -e
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shopt -s dotglob
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rm -r *
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${rsync}/bin/rsync \
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--checksum --times --atimes --chown=$USER:$USER --chmod=+w \
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-r ${checkpointArtifacts}/outputs/ .
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patch -p 1 -i "$sourceDifferencePatchFile"
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rm "$sourceDifferencePatchFile"
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'';
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});
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mkCheckpointedBuild = lib.warn
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"`mkCheckpointedBuild` is deprecated, use `mkCheckpointBuild` instead!"
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mkCheckpointBuild;
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}
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