Allow git cl also in repos with read-only git-svn.

git_cl.py

Index: git_cl.py
diff --git a/git_cl.py b/git_cl.py
index 72770a145e4194197b910b7c0eb7db5cb2469e08..3c51377f61d722d46091d2ea40030b479534eef3 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -327,9 +327,13 @@ class Settings(object):
   def GetIsGitSvn(self):
     """Return true if this repo looks like it's using git-svn."""
     if self.is_git_svn is None:
-      # If you have any "svn-remote.*" config keys, we think you're using svn.
-      self.is_git_svn = RunGitWithCode(
-          ['config', '--local', '--get-regexp', r'^svn-remote\.'])[0] == 0
+      # The presence of a svn-remote using the svn:// (or file://)
+      # protocol suggests that you're using svn. Remotes with the
+      # http* protocols suggest read-only svn access and are ignored.
+      code, result = RunGitWithCode(
+          ['config', '--local', '--get-regexp', r'^svn-remote\..*\.url'])
+      self.is_git_svn = (code == 0 and ("svn://" in result or
+                                        "file://" in result))
     return self.is_git_svn
 
   def GetSVNBranch(self):