From b58e991272dca9dd906f71870da10ded1a61f6cb Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Mon, 11 Feb 2013 16:50:39 +0100
Subject: [PATCH] all-packages.nix: provide a variant of Darcs that includes
 the executable, but not the library

The reduced 'darcs' derivation is supposed to be run-time independent of the
Haskell compiler. Unfortunately, this isn't quite true yet because the HTTP
package bakes its own store path into the library. This causes Darcs -- which
links the HTTP library statically -- to depend on 'HTTP', which in turn depends
on lot of other Haskell stuff. Patching HTTP to get rid of that reference looks
feasible, though.
---
 pkgs/top-level/all-packages.nix | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 7a5639fe2dd..1a3b1043e25 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6813,7 +6813,14 @@ let
 
   d4x = callPackage ../applications/misc/d4x { };
 
-  darcs = lib.setName "darcs-${haskellPackages.darcs.version}" haskellPackages.darcs;
+  darcs = haskellPackages.darcs.override {
+    # A variant of the Darcs derivation that containts only the executable and
+    # thus has no dependencies on other Haskell packages.
+    cabal = { mkDerivation = x: rec { final = haskellPackages.cabal.mkDerivation (self: (x final) // {
+	      isLibrary = false;
+	      configureFlags = "-f-library"; }); }.final;
+	    };
+  };
 
   darktable = callPackage ../applications/graphics/darktable {
     inherit (gnome) GConf libglade;