92 lines
2.8 KiB
Nix
92 lines
2.8 KiB
Nix
# buildEnv creates a tree of symlinks to the specified paths. This is
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# a fork of the hardcoded buildEnv in the Nix distribution.
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{ buildPackages, runCommand, lib, substituteAll, writeClosure }:
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let
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builder = substituteAll {
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src = ./builder.pl;
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inherit (builtins) storeDir;
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};
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in
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lib.makeOverridable
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({ name
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, # The manifest file (if any). A symlink $out/manifest will be
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# created to it.
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manifest ? ""
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, # The paths to symlink.
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paths
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, # Whether to ignore collisions or abort.
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ignoreCollisions ? false
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, # Whether to include closures of all input paths.
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includeClosures ? false
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, # If there is a collision, check whether the contents and permissions match
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# and only if not, throw a collision error.
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checkCollisionContents ? true
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, # The paths (relative to each element of `paths') that we want to
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# symlink (e.g., ["/bin"]). Any file not inside any of the
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# directories in the list is not symlinked.
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pathsToLink ? ["/"]
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, # The package outputs to include. By default, only the default
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# output is included.
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extraOutputsToInstall ? []
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, # Root the result in directory "$out${extraPrefix}", e.g. "/share".
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extraPrefix ? ""
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, # Shell commands to run after building the symlink tree.
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postBuild ? ""
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# Additional inputs
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, nativeBuildInputs ? [] # Handy e.g. if using makeWrapper in `postBuild`.
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, buildInputs ? []
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, passthru ? {}
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, meta ? {}
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}:
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let
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chosenOutputs = map (drv: {
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paths =
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# First add the usual output(s): respect if user has chosen explicitly,
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# and otherwise use `meta.outputsToInstall`. The attribute is guaranteed
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# to exist in mkDerivation-created cases. The other cases (e.g. runCommand)
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# aren't expected to have multiple outputs.
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(if (! drv ? outputSpecified || ! drv.outputSpecified)
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&& drv.meta.outputsToInstall or null != null
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then map (outName: drv.${outName}) drv.meta.outputsToInstall
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else [ drv ])
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# Add any extra outputs specified by the caller of `buildEnv`.
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++ lib.filter (p: p!=null)
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(builtins.map (outName: drv.${outName} or null) extraOutputsToInstall);
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priority = drv.meta.priority or lib.meta.defaultPriority;
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}) paths;
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pathsForClosure = lib.pipe chosenOutputs [
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(map (p: p.paths))
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lib.flatten
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(lib.remove null)
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];
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in runCommand name
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rec {
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inherit manifest ignoreCollisions checkCollisionContents passthru
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meta pathsToLink extraPrefix postBuild
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nativeBuildInputs buildInputs;
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pkgs = builtins.toJSON chosenOutputs;
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extraPathsFrom = lib.optional includeClosures (writeClosure pathsForClosure);
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preferLocalBuild = true;
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allowSubstitutes = false;
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# XXX: The size is somewhat arbitrary
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passAsFile = if builtins.stringLength pkgs >= 128*1024 then [ "pkgs" ] else [ ];
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}
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''
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${buildPackages.perl}/bin/perl -w ${builder}
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eval "$postBuild"
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'')
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