forked from mirrors/nixpkgs
218d4dc154
Not only does the suffix unnecessarily reduce sharing, but it also breaks unpacker setup hooks (e.g. that of `unzip`) which identify interesting tarballs using the file extension. This also means we can get rid of the splicing hacks for fetchers.
121 lines
5.6 KiB
Nix
121 lines
5.6 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.targetPlatform == pkgs.hostPlatform
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then defaultBuildHostScope
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else assert pkgs.hostPlatform == pkgs.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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splicer = pkgsBuildBuild: pkgsBuildHost: pkgsBuildTarget:
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pkgsHostHost: pkgsHostTarget:
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pkgsTargetTarget: 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 splicer.";
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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 // splicer
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(tryGetOutputs valueBuildBuild) (tryGetOutputs valueBuildHost) (tryGetOutputs valueBuildTarget)
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(tryGetOutputs valueHostHost) (getOutputs valueHostTarget)
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(tryGetOutputs valueTargetTarget)
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# Just recur on plain attrsets
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else if lib.isAttrs defaultValue then splicer
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valueBuildBuild valueBuildHost valueBuildTarget
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{} valueHostTarget
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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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splicedPackages =
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if actuallySplice
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then
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splicer
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defaultBuildBuildScope defaultBuildHostScope defaultBuildTargetScope
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defaultHostHostScope defaultHostTargetScope
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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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buildPlatform targetPlatform hostPlatform;
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}
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else pkgs // pkgs.xorg;
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in
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{
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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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}
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