Fail noisily when git auto-svn can't authenticate.

git_auto_svn.py

Index: git_auto_svn.py
diff --git a/git_auto_svn.py b/git_auto_svn.py
index 4faa9a0d5c2bc3133e67260bddbe648384aa1b32..d4c5cddfebbd8975ee1916a211713df636f3a79c 100755
--- a/git_auto_svn.py
+++ b/git_auto_svn.py
@@ -78,7 +78,11 @@ def main(argv):
       svn_repo = maybe_repo
       svn_path = '/'.join(path_components[i+1:])
       break
-    except subprocess2.CalledProcessError:
+    except subprocess2.CalledProcessError, e:
+      if 'E170001' in str(e):
+        print e
+        print 'Hint: maybe follow https://chromium-access.appspot.com/ ?'

[agable, 2014/11/17 19:00:46]

This could be waaaay more descriptive. If you're going to have it fail noisily,
say something like
print 'Authentication failed:'
print e
print 'Try running "svn ls %s" with the password from
https://chromium-access.appspot.com' % maybe_repo

[tandrii_google, 2014/12/01 22:25:34]

Done.

+        print
       continue
   assert svn_repo is not None, 'Unable to find svn repo for %s' % match.group(1)
   print 'Found upstream svn repo %s and path %s' % (svn_repo, svn_path)