139 lines
6.4 KiB
Nix
139 lines
6.4 KiB
Nix
# The `splicedPackages' package set, and its use by `callPackage`
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#
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# The `buildPackages` pkg set is a new concept, and the vast majority package
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# expression (the other *.nix files) are not designed with it in mind. This
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# presents us with a problem with how to get the right version (build-time vs
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# run-time) of a package to a consumer that isn't used to thinking so cleverly.
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#
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# The solution is to splice the package sets together as we do below, so every
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# `callPackage`d expression in fact gets both versions. Each# derivation (and
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# each derivation's outputs) consists of the run-time version, augmented with a
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# `nativeDrv` field for the build-time version, and `crossDrv` field for the
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# run-time version.
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#
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# We could have used any names we want for the disambiguated versions, but
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# `crossDrv` and `nativeDrv` were somewhat similarly used for the old
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# cross-compiling infrastructure. The names are mostly invisible as
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# `mkDerivation` knows how to pull out the right ones for `buildDepends` and
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# friends, but a few packages use them directly, so it seemed efficient (to
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# @Ericson2314) to reuse those names, at least initially, to minimize breakage.
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#
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# For performance reasons, rather than uniformally splice in all cases, we only
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# do so when `pkgs` and `buildPackages` are distinct. The `actuallySplice`
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# parameter there the boolean value of that equality check.
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lib: pkgs: actuallySplice:
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let
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defaultBuildBuildScope = pkgs.buildPackages.buildPackages // pkgs.buildPackages.buildPackages.xorg;
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defaultBuildHostScope = pkgs.buildPackages // pkgs.buildPackages.xorg;
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defaultBuildTargetScope =
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if pkgs.stdenv.targetPlatform == pkgs.stdenv.hostPlatform
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then defaultBuildHostScope
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else assert pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform; defaultHostTargetScope;
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defaultHostHostScope = {}; # unimplemented
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defaultHostTargetScope = pkgs // pkgs.xorg;
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defaultTargetTargetScope = pkgs.targetPackages // pkgs.targetPackages.xorg or {};
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spliceReal = { pkgsBuildBuild, pkgsBuildHost, pkgsBuildTarget
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, pkgsHostHost, pkgsHostTarget
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, pkgsTargetTarget
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}: let
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mash =
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# Other pkgs sets
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pkgsBuildBuild // pkgsBuildTarget // pkgsHostHost // pkgsTargetTarget
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# The same pkgs sets one probably intends
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// pkgsBuildHost // pkgsHostTarget;
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merge = name: {
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inherit name;
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value = let
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defaultValue = mash.${name};
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# `or {}` is for the non-derivation attsert splicing case, where `{}` is the identity.
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valueBuildBuild = pkgsBuildBuild.${name} or {};
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valueBuildHost = pkgsBuildHost.${name} or {};
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valueBuildTarget = pkgsBuildTarget.${name} or {};
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valueHostHost = throw "`valueHostHost` unimplemented: pass manually rather than relying on splice.";
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valueHostTarget = pkgsHostTarget.${name} or {};
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valueTargetTarget = pkgsTargetTarget.${name} or {};
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augmentedValue = defaultValue
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# TODO(@Ericson2314): Stop using old names after transition period
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// (lib.optionalAttrs (pkgsBuildHost ? ${name}) { nativeDrv = valueBuildHost; })
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// (lib.optionalAttrs (pkgsHostTarget ? ${name}) { crossDrv = valueHostTarget; })
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// {
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__spliced =
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(lib.optionalAttrs (pkgsBuildBuild ? ${name}) { buildBuild = valueBuildBuild; })
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// (lib.optionalAttrs (pkgsBuildTarget ? ${name}) { buildTarget = valueBuildTarget; })
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// { hostHost = valueHostHost; }
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// (lib.optionalAttrs (pkgsTargetTarget ? ${name}) { targetTarget = valueTargetTarget;
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});
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};
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# Get the set of outputs of a derivation. If one derivation fails to
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# evaluate we don't want to diverge the entire splice, so we fall back
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# on {}
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tryGetOutputs = value0: let
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inherit (builtins.tryEval value0) success value;
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in getOutputs (lib.optionalAttrs success value);
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getOutputs = value: lib.genAttrs
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(value.outputs or (lib.optional (value ? out) "out"))
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(output: value.${output});
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in
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# The derivation along with its outputs, which we recur
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# on to splice them together.
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if lib.isDerivation defaultValue then augmentedValue // spliceReal {
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pkgsBuildBuild = tryGetOutputs valueBuildBuild;
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pkgsBuildHost = tryGetOutputs valueBuildHost;
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pkgsBuildTarget = tryGetOutputs valueBuildTarget;
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pkgsHostHost = tryGetOutputs valueHostHost;
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pkgsHostTarget = getOutputs valueHostTarget;
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pkgsTargetTarget = tryGetOutputs valueTargetTarget;
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# Just recur on plain attrsets
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} else if lib.isAttrs defaultValue then spliceReal {
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pkgsBuildBuild = valueBuildBuild;
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pkgsBuildHost = valueBuildHost;
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pkgsBuildTarget = valueBuildTarget;
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pkgsHostHost = {};
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pkgsHostTarget = valueHostTarget;
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pkgsTargetTarget = valueTargetTarget;
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# Don't be fancy about non-derivations. But we could have used used
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# `__functor__` for functions instead.
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} else defaultValue;
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};
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in lib.listToAttrs (map merge (lib.attrNames mash));
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splicePackages = { pkgsBuildBuild, pkgsBuildHost, pkgsBuildTarget
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, pkgsHostHost, pkgsHostTarget
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, pkgsTargetTarget
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} @ args:
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if actuallySplice then spliceReal args else pkgsHostTarget;
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splicedPackages = splicePackages {
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pkgsBuildBuild = defaultBuildBuildScope;
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pkgsBuildHost = defaultBuildHostScope;
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pkgsBuildTarget = defaultBuildTargetScope;
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pkgsHostHost = defaultHostHostScope;
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pkgsHostTarget = defaultHostTargetScope;
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pkgsTargetTarget = defaultTargetTargetScope;
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} // {
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# These should never be spliced under any circumstances
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inherit (pkgs) pkgs buildPackages targetPackages;
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inherit (pkgs.stdenv) buildPlatform targetPlatform hostPlatform;
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};
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in
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{
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inherit splicePackages;
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# We use `callPackage' to be able to omit function arguments that can be
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# obtained `pkgs` or `buildPackages` and their `xorg` package sets. Use
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# `newScope' for sets of packages in `pkgs' (see e.g. `gnome' below).
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callPackage = pkgs.newScope {};
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callPackages = lib.callPackagesWith splicedPackages;
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newScope = extra: lib.callPackageWith (splicedPackages // extra);
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# Haskell package sets need this because they reimplement their own
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# `newScope`.
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__splicedPackages = splicedPackages // { recurseForDerivations = false; };
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}
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