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top-level: Fix splicing, again

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This commit is contained in:
John Ericson 2017-12-10 16:38:48 -05:00
parent 965cc5da57
commit 6c36d3c9e0
1 changed files with 9 additions and 10 deletions
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19
pkgs/top-level/splice.nix
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@ -37,26 +37,25 @@ let
inherit name;
value = let
defaultValue = mash.${name};
buildValue = buildPkgs.${name};
runValue = runPkgs.${name};
# `or {}` is for the non-derivation attsert splicing case, where `{}` is the identity.
buildValue = buildPkgs.${name} or {};
runValue = runPkgs.${name} or {};
augmentedValue = defaultValue
// (lib.optionalAttrs (buildPkgs ? ${name}) { nativeDrv = buildValue; })
// (lib.optionalAttrs (runPkgs ? ${name}) { crossDrv = runValue; });
# Get the set of outputs of a derivation
# Get the set of outputs of a derivation. If one derivation fails to
# evaluate we don't want to diverge the entire splice, so we fall back
# on {}
tryGetOutputs = value0: let
eval = builtins.tryEval value0;
in getOutputs (if eval.success then eval.value else {});
inherit (builtins.tryEval value0) success value;
in getOutputs (lib.optionalAttrs success value);
getOutputs = value: lib.genAttrs
(value.outputs or (lib.optional (value ? out) "out"))
(output: value.${output});
in
# Certain *Cross derivations will fail assertions, but we need their
# nativeDrv. We are assuming anything that fails to evaluate is an
# attrset (including derivation) and thus can be unioned.
if !(builtins.tryEval defaultValue).success then augmentedValue
# The derivation along with its outputs, which we recur
# on to splice them together.
else if lib.isDerivation defaultValue then augmentedValue
if lib.isDerivation defaultValue then augmentedValue
// splicer (tryGetOutputs buildValue) (getOutputs runValue)
# Just recur on plain attrsets
else if lib.isAttrs defaultValue then splicer buildValue runValue