# HG changeset patch
# User Siddharth Agarwal <sid0@fb.com>
# Date 1425668313 28800
# Node ID 6547d63aee4e9ab974d20775edde9b84a1da9e2a
# Parent  875112f4bf0db6de6b804109eceb40396cf22b2e
git_handler: reintroduce compatibility with dulwich 0.9.4 (issue124)

It's the version that ships with the latest Ubuntu LTS as of this writing.

diff --git a/hggit/git_handler.py b/hggit/git_handler.py
--- a/hggit/git_handler.py
+++ b/hggit/git_handler.py
@@ -1519,7 +1519,16 @@
             opener = urllib2.build_opener(auth_handler)
             useragent = 'git/20x6 (hg-git ; uses dulwich and hg ; like git-core)'
             opener.addheaders = [('User-Agent', useragent)]
-            return client.HttpGitClient(uri, opener=opener), uri
+            try:
+                return client.HttpGitClient(uri, opener=opener), uri
+            except TypeError as e:
+                if e.message.find("unexpected keyword argument 'opener'") >= 0:
+                    # Dulwich 0.9.4, which is the latest version that ships with
+                    # Ubuntu 14.04, doesn't support the 'opener' keyword. Try
+                    # without authentication.
+                    return client.HttpGitClient(uri), uri
+                else:
+                    raise
 
         # if its not git or git+ssh, try a local url..
         return client.SubprocessGitClient(), uri