* fetchgit and nix-prefetch-git

svn path=/nixpkgs/trunk/; revision=16035

pkgs/build-support/fetchgit/builder.sh

@@ -0,0 +1,13 @@
+source $stdenv/setup
+
+header "exporting $url (rev $rev) into $out"
+
+git clone "$url" $out
+if test -n "$rev"; then
+  cd $out
+  git checkout $rev
+fi
+find $out -name .git\* | xargs rm -rf
+
+stopNest
+