clone: no race possible, we can use changegroup() and have smaller urls
Related to issue2126
-- With aaaStatus:A somename other-fileDiff:diff --git a/other-file b/somenamecopy from other-filecopy to somename-- With zzzStatus:A somename other-fileDiff:diff --git a/other-file b/somenamecopy from other-filecopy to somename