Fixes creating a Repo for a submodule

Fixes #155.

1 files changed, 13 insertions, 0 deletions

diff --git a/git/repo/fun.py b/git/repo/fun.py
index 7a8657ab..2c49d836 100644
--- a/git/repo/fun.py
+++ b/git/repo/fun.py
@@ -7,6 +7,7 @@ from gitdb.util import (
                             join,
                             isdir, 
                             isfile,
+                            dirname,
                             hex_to_bin, 
                             bin_to_hex
                         )
@@ -31,6 +32,18 @@ def is_git_dir(d):
     return False
 
 
+def find_git_dir(d):
+    if is_git_dir(d):
+        return d
+    elif isfile(d):
+        with open(d) as fp:
+            content = fp.read().rstrip()
+        if content.startswith('gitdir: '):
+            d = join(dirname(d), content[8:])
+            return find_git_dir(d)
+    return None
+
+
 def short_to_long(odb, hexsha):
     """:return: long hexadecimal sha1 from the given less-than-40 byte hexsha
         or None if no candidate could be found.