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Filter null elements from dependency lists to keep hashes stable.

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svn path=/nixpkgs/trunk/; revision=28434
This commit is contained in:
Andres Löh 2011-08-09 14:55:53 +00:00
parent 369832838b
commit 31654fc153
1 changed files with 10 additions and 1 deletions
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11
pkgs/development/libraries/haskell/cabal/cabal.nix
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@ -11,6 +11,15 @@
"isLibrary" "isExecutable"
];
# Stuff happening after the user preferences have been processed. We remove
# internal attributes and strip null elements from the dependency lists, all
# in the interest of keeping hashes stable.
postprocess =
x : (removeAttrs x internalAttrs) // {
buildInputs = stdenv.lib.filter (y : ! (y == null)) x.buildInputs;
propagatedBuildInputs = stdenv.lib.filter (y : ! (y == null)) x.propagatedBuildInputs;
};
defaults =
self : { # self is the final version of the attribute set
@ -142,5 +151,5 @@
# in Cabal derivations.
inherit stdenv ghc;
};
in stdenv.mkDerivation (removeAttrs ((rec { f = defaults f // args f; }).f) internalAttrs) ;
in stdenv.mkDerivation (postprocess ((rec { f = defaults f // args f; }).f)) ;
}