From 48865a4aa61fb2901a173463d64ee05533af119c Mon Sep 17 00:00:00 2001
From: Marc Weber <marco-oweber@gmx.de>
Date: Sat, 26 Sep 2009 23:33:11 +0000
Subject: [PATCH] symlink duplicate git executables to bring down $out to 13MB
 (was > 100MB)

svn path=/nixpkgs/trunk/; revision=17458
---
 .../git-and-tools/git/default.nix               | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/pkgs/applications/version-management/git-and-tools/git/default.nix b/pkgs/applications/version-management/git-and-tools/git/default.nix
index 6a2393f3949..b94868b1471 100644
--- a/pkgs/applications/version-management/git-and-tools/git/default.nix
+++ b/pkgs/applications/version-management/git-and-tools/git/default.nix
@@ -87,6 +87,23 @@ stdenv.mkDerivation rec {
    + ''# install bash completion script
       d="$out/etc/bash_completion.d"
       ensureDir $d; cp contrib/completion/git-completion.bash "$d"
+     ''
+   # Don't know why hardlinks aren't created. git installs the same executable multiple times into $out
+   # so replace duplicates by symlinks because I haven't tested whether the nix
+   # distribution system can handle hardlinks. This reduces the size of $out from 115MB down to 13MB on x86_64-linux!
+   + ''#
+      set -x
+      declare -A seen
+      find $out -type f | while read f; do
+        sum=$(md5sum "$f");
+        sum=''\${sum/ */}
+        if [ -z "''\${seen["$sum"]}" ]; then
+          seen["$sum"]="$f"
+        else
+          rm "$f"; ln -s "''\${seen["$sum"]}" "$f"
+        fi
+      done
+
      '';
 
   meta = {