Add -- to git commands to avoid ambiguities (fixes #303)

Author: chubin

lib/adapter/git_adapter.py

@@ -124,7 +124,7 @@ def current_state_command(cls):
             raise RuntimeError(
                 "Do not known how to handle this repository: %s" % cls._repository_url)
 
-        return ['git', 'rev-parse', '--short', 'HEAD']
+        return ['git', 'rev-parse', '--short', 'HEAD', "--"]
 
     @classmethod
     def save_state(cls, state):
@@ -157,6 +157,6 @@ def get_updates_list_command(cls):
         The list is used to invalidate the cache.
         """
         current_state = cls.get_state()
-        if current_state is None:
-            return ['git', 'ls-tree', '--full-tree', '-r', '--name-only', 'HEAD']
-        return ['git', 'diff', '--name-only', current_state, 'HEAD']
+        if not current_state:
+            return ['git', 'ls-tree', '--full-tree', '-r', '--name-only', 'HEAD', "--"]
+        return ['git', 'diff', '--name-only', current_state, 'HEAD', "--"]

lib/fetch.py

@@ -118,7 +118,7 @@ def _update_adapter(adptr):
 
     errorcode, output = _run_cmd(cmd)
     if errorcode:
-        _log("\nERROR:\n---\n" + output + "\n---\nCould not update %s" % adptr)
+        _log("\nERROR:\n---%s\n" % output.decode("utf-8") + "\n---\nCould not update %s" % adptr)
         return False
 
     # Getting current repository state