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, 1 insertions, 1 deletions

diff --git a/src/libutil/archive.cc b/src/libutil/archive.cc
index ea1deb924e67..f71229d8fdd6 100644
--- a/src/libutil/archive.cc
+++ b/src/libutil/archive.cc
@@ -29,7 +29,7 @@ const std::string narVersionMagic1 = "nix-archive-1";
 
 static string caseHackSuffix = "~nix~case~hack~";
 
-PathFilter defaultPathFilter;
+PathFilter defaultPathFilter = [](const Path &) { return true; };
 
 
 static void dumpContents(const Path & path, size_t size,