为什么从SVN安装python couchdb实验分支的pip失败?

我正在为一个项目设置fabric/virtualenv/pip自动部署,我需要安装最新的python couchdb实验分支。当然,我把它放在我的PIP需求文件中,比如:

-e svn+http://couchdb-python.googlecode.com/svn/branches/experimental/httplib@195#egg=CouchDB-dev_r195

但是,当我运行部署时,会收到以下错误和跟踪:

[192.168.1.200] out: Obtaining CouchDB from svn+http://couchdb-python.googlecode.com/svn/branches/experimental/httplib/#egg=CouchDB (from -r requirements.txt (line 1))
[192.168.1.200] out:   Checking out http://couchdb-python.googlecode.com/svn/branches/experimental/httplib/ to ./src/couchdb
[192.168.1.200] out:   Error [Errno 2] No such file or directory while executing command svn checkout -q http://couchdb-python.googlecode.com/svn/branches/experimental/httplib/ /home/sk/votersdaily/src/couchdb
[192.168.1.200] out: Exception:
[192.168.1.200] out: Traceback (most recent call last):
[192.168.1.200] out:   File "/usr/local/lib/python2.6/dist-packages/pip-0.6.1-py2.6.egg/pip.py", line 482, in main
[192.168.1.200] out:     self.run(options, args)
[192.168.1.200] out:   File "/usr/local/lib/python2.6/dist-packages/pip-0.6.1-py2.6.egg/pip.py", line 675, in run
[192.168.1.200] out:     requirement_set.install_files(finder, force_root_egg_info=self.bundle)
[192.168.1.200] out:   File "/usr/local/lib/python2.6/dist-packages/pip-0.6.1-py2.6.egg/pip.py", line 2409, in install_files
[192.168.1.200] out:     req_to_install.update_editable(not self.is_download)
[192.168.1.200] out:   File "/usr/local/lib/python2.6/dist-packages/pip-0.6.1-py2.6.egg/pip.py", line 1970, in update_editable
[192.168.1.200] out:     vcs_backend.obtain(self.source_dir)
[192.168.1.200] out:   File "/usr/local/lib/python2.6/dist-packages/pip-0.6.1-py2.6.egg/pip.py", line 3420, in obtain
[192.168.1.200] out:     ['svn', 'checkout', '-q'] + rev_options + [url, dest])
[192.168.1.200] out:   File "/usr/local/lib/python2.6/dist-packages/pip-0.6.1-py2.6.egg/pip.py", line 4320, in call_subprocess
[192.168.1.200] out:     cwd=cwd, env=env)
[192.168.1.200] out:   File "/usr/lib/python2.6/subprocess.py", line 621, in __init__
[192.168.1.200] out:     errread, errwrite)
[192.168.1.200] out:   File "/usr/lib/python2.6/subprocess.py", line 1126, in _execute_child
[192.168.1.200] out:     raise child_exception
[192.168.1.200] out: OSError: [Errno 2] No such file or directory

我知道的是:

• 该错误与找不到setup.py有关,因为文件从未下载。它似乎拒绝创建路径/home/sk/votersdayly/src/couchdb,但对于其他包,它总是根据需要创建此路径。
• 我既可以作为根用户运行,也可以作为本地用户运行,但失败的是相同的。
• 如果我手动创建目录,那么它会给出一个提示,告诉我该目录当前不是SVN repo,并询问我是否要覆盖它。如果我把它擦掉了,它仍然不签回购协议。
• 我重新安装了pip并重新创建了virtualenv,错误也被复制了。
• 我可以成功地在本地工作站(在virtualenv中)上执行这个pip安装。

建议?我知道这一定是某种库或权限冲突,但我似乎无法确定,

谢谢。