builtins.fetchgit: Support importing a working tree

For example, you can write

  src = fetchgit ./.;

and if ./. refers to an unclean working tree, that tree will be copied
to the Nix store. This removes the need for "cleanSource".

1 files changed, 6 insertions, 0 deletions

diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index fccf5d8548..63a93f2ca6 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -481,4 +481,10 @@ struct MaintainCount
 std::pair<unsigned short, unsigned short> getWindowSize();
 
 
+/* Used in various places. */
+typedef std::function<bool(const Path & path)> PathFilter;
+
+extern PathFilter defaultPathFilter;
+
+
 }