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top-level: Expose splicePackages for newScope users

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Otherwise extra packages in scope can't be made to work for cross. As
much as I think splicing is an evil trick, I think it's best to do this
and at least have it work consistently for now.

It would seems simpler to expose a `newScopeWithSplicing`, but there's a
few attrs (like `buildPackages` or `buildHaskellPackages`) that
shouldn't be spliced. Users should instead splice, override the splicing
on those packages, and apply `newScope` to that.
This commit is contained in:
John Ericson 2018-07-05 20:19:07 -04:00
parent 48ccdf322d
commit 0eb142cd46
1 changed files with 40 additions and 26 deletions
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66
pkgs/top-level/splice.nix
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@ -34,9 +34,10 @@ let
defaultHostTargetScope = pkgs // pkgs.xorg;
defaultTargetTargetScope = pkgs.targetPackages // pkgs.targetPackages.xorg or {};
splicer = pkgsBuildBuild: pkgsBuildHost: pkgsBuildTarget:
pkgsHostHost: pkgsHostTarget:
pkgsTargetTarget: let
spliceReal = { pkgsBuildBuild, pkgsBuildHost, pkgsBuildTarget
, pkgsHostHost, pkgsHostTarget
, pkgsTargetTarget
}: let
mash =
# Other pkgs sets
pkgsBuildBuild // pkgsBuildTarget // pkgsHostHost // pkgsTargetTarget
@ -50,7 +51,7 @@ let
valueBuildBuild = pkgsBuildBuild.${name} or {};
valueBuildHost = pkgsBuildHost.${name} or {};
valueBuildTarget = pkgsBuildTarget.${name} or {};
valueHostHost = throw "`valueHostHost` unimplemented: pass manually rather than relying on splicer.";
valueHostHost = throw "`valueHostHost` unimplemented: pass manually rather than relying on splice.";
valueHostTarget = pkgsHostTarget.${name} or {};
valueTargetTarget = pkgsTargetTarget.${name} or {};
augmentedValue = defaultValue
@ -77,38 +78,51 @@ let
in
# The derivation along with its outputs, which we recur
# on to splice them together.
if lib.isDerivation defaultValue then augmentedValue // splicer
(tryGetOutputs valueBuildBuild) (tryGetOutputs valueBuildHost) (tryGetOutputs valueBuildTarget)
(tryGetOutputs valueHostHost) (getOutputs valueHostTarget)
(tryGetOutputs valueTargetTarget)
if lib.isDerivation defaultValue then augmentedValue // spliceReal {
pkgsBuildBuild = tryGetOutputs valueBuildBuild;
pkgsBuildHost = tryGetOutputs valueBuildHost;
pkgsBuildTarget = tryGetOutputs valueBuildTarget;
pkgsHostHost = tryGetOutputs valueHostHost;
pkgsHostTarget = getOutputs valueHostTarget;
pkgsTargetTarget = tryGetOutputs valueTargetTarget;
# Just recur on plain attrsets
else if lib.isAttrs defaultValue then splicer
valueBuildBuild valueBuildHost valueBuildTarget
{} valueHostTarget
valueTargetTarget
} else if lib.isAttrs defaultValue then spliceReal {
pkgsBuildBuild = valueBuildBuild;
pkgsBuildHost = valueBuildHost;
pkgsBuildTarget = valueBuildTarget;
pkgsHostHost = {};
pkgsHostTarget = valueHostTarget;
pkgsTargetTarget = valueTargetTarget;
# Don't be fancy about non-derivations. But we could have used used
# `__functor__` for functions instead.
else defaultValue;
} else defaultValue;
};
in lib.listToAttrs (map merge (lib.attrNames mash));
splicedPackages =
if actuallySplice
then
splicer
defaultBuildBuildScope defaultBuildHostScope defaultBuildTargetScope
defaultHostHostScope defaultHostTargetScope
defaultTargetTargetScope
// {
# These should never be spliced under any circumstances
inherit (pkgs) pkgs buildPackages targetPackages
buildPlatform targetPlatform hostPlatform;
}
else pkgs // pkgs.xorg;
splicePackages = { pkgsBuildBuild, pkgsBuildHost, pkgsBuildTarget
, pkgsHostHost, pkgsHostTarget
, pkgsTargetTarget
} @ args:
if actuallySplice then spliceReal args else pkgsHostTarget;
splicedPackages = splicePackages {
pkgsBuildBuild = defaultBuildBuildScope;
pkgsBuildHost = defaultBuildHostScope;
pkgsBuildTarget = defaultBuildTargetScope;
pkgsHostHost = defaultHostHostScope;
pkgsHostTarget = defaultHostTargetScope;
pkgsTargetTarget = defaultTargetTargetScope;
} // {
# These should never be spliced under any circumstances
inherit (pkgs) pkgs buildPackages targetPackages
buildPlatform targetPlatform hostPlatform;
};
in
{
inherit splicedPackages;
# We use `callPackage' to be able to omit function arguments that can be
# obtained `pkgs` or `buildPackages` and their `xorg` package sets. Use
# `newScope' for sets of packages in `pkgs' (see e.g. `gnome' below).