worktrees: make non-packed refs also work correctly.

Turns out aec58a9 did the right thing for /packed/ refs, but didn't work
correctly on /unpacked/ refs.  So this patch gives unpacked refs the
same treatment.

Without the fix here, the test added will cause this traceback:

======================================================================
ERROR: Check that we find .git as a worktree file and find the worktree
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/pjones/devel/github.com/GitPython/git/test/lib/helper.py", line 92, in wrapper
    return func(self, path)
  File "/home/pjones/devel/github.com/GitPython/git/test/test_repo.py", line 938, in test_git_work_tree_dotgit
    self.assertIsInstance(repo.heads['aaaaaaaa'], Head)
  File "/home/pjones/devel/github.com/GitPython/git/util.py", line 893, in __getitem__
    raise IndexError("No item found with id %r" % (self._prefix + index))
IndexError: No item found with id 'aaaaaaaa'

Woops.

Things I've learned:
- test_remote doesn't work currently if you start on a branch.  I think
  it never did?
- Because of 346424da, all *sorts* of stuff in the test suite doesn't
  work if you name your development branch "packed-refs"
  (This seems like a bug...)

Signed-off-by: Peter Jones <pjones@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/git/remote.py b/git/remote.py
index fd76e592..29c7ed92 100644
--- a/git/remote.py
+++ b/git/remote.py
@@ -652,7 +652,7 @@ class Remote(LazyMixin, Iterable):
                     continue
 
         # read head information
-        with open(osp.join(self.repo.git_dir, 'FETCH_HEAD'), 'rb') as fp:
+        with open(osp.join(self.repo.common_dir, 'FETCH_HEAD'), 'rb') as fp:
             fetch_head_info = [l.decode(defenc) for l in fp.readlines()]
 
         l_fil = len(fetch_info_lines)