games: Add a new gogUnpackHook

This should make all the extra unpackCmd attributes for the GOG games
superfluous and make the expression way less convoluted, especially the
games based on Unity3D.

Right now however, the gogUnpackHook is added to buildGame, which is
used for all games, not only for the GOG ones. While it doesn't really
hurt or affect non-GOG games, it's still part of the build closure so we
might want to apply this to GOG only at some day.

For that, we need to restructure our whole packaging layout, because we
want to have a way to override buildGame only for a certain namespace
but without introducing too much churn or duplicating things.

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @layus

1 files changed, 1 insertions, 0 deletions

diff --git a/pkgs/games/default.nix b/pkgs/games/default.nix
index bead9271..71ccdf5e 100644
--- a/pkgs/games/default.nix
+++ b/pkgs/games/default.nix
@@ -23,6 +23,7 @@ let
     self = import ./build-support {
       inherit (super) config;
       callPackage = pkgs.lib.callPackageWith (super // self);
+      callPackages = pkgs.lib.callPackagesWith (super // self);
     };
   in self;