cygwin, #533: Allow '/cygdrive/c/' paths on repo init

- Cygwin TCs failing:
  - PY2: err: 13, fail: 2
  - PY3: err: 12, fail: 2

1 files changed, 13 insertions, 1 deletions

diff --git a/git/util.py b/git/util.py
index b7d18023..9668f7b3 100644
--- a/git/util.py
+++ b/git/util.py
@@ -222,7 +222,7 @@ def _cygexpath(drive, path):
         #  It's an error, leave it alone just slashes)
         p = path
     else:
-        p = osp.normpath(osp.expandvars(os.path.expanduser(path)))
+        p = path and osp.normpath(osp.expandvars(os.path.expanduser(path)))
         if osp.isabs(p):
             if drive:
                 # Confusing, maybe a remote system should expand vars.
@@ -278,6 +278,18 @@ def cygpath(path):
     return path
 
 
+_decygpath_regex = re.compile(r"/cygdrive/(\w)(/.*)?")
+
+
+def decygpath(path):
+    m = _decygpath_regex.match(path)
+    if m:
+        drive, rest_path = m.groups()
+        path = '%s:%s' % (drive.upper(), rest_path or '')
+
+    return path.replace('/', '\\')
+
+
 #: Store boolean flags denoting if a specific Git executable
 #: is from a Cygwin installation (since `cache_lru()` unsupported on PY2).
 _is_cygwin_cache = {}