Issue 1808 - ensure_dependencies.py generates wrong repository path for local roots

ensure_dependencies.py

 #!/usr/bin/env python
 # coding: utf-8
 
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 import sys
 import os
 import posixpath
@@ skipping 169 matching lines @@
     return
 
   parenttype = get_repo_type(parentrepo)
   type = None
   for key in roots:
     if key == parenttype or (key in repo_types and type is None):
       type = key
   if type is None:
     raise Exception("No valid source found to create %s" % target)
 
-  url = urlparse.urljoin(roots[type], sourcename)
+  if os.path.exists(roots[type]):
+    url = os.path.join(roots[type], sourcename)
+  else:
+    url = urlparse.urljoin(roots[type], sourcename)
+
   logging.info("Cloning repository %s into %s" % (url, target))
   repo_types[type].clone(url, target)
 
   for repo in repo_types.itervalues():
     if repo.istype(parentrepo):
       repo.ignore(target, parentrepo)
 
 def update_repo(target, revisions):
   type = get_repo_type(target)
   if type is None:
@@ skipping 85 matching lines @@
   args = parser.parse_args()
 
   if args.quiet:
     logging.disable(logging.INFO)
 
   repos = args.repos
   if not len(repos):
     repos = [os.path.dirname(__file__)]
   for repo in repos:
     resolve_deps(repo)