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https://launchpad.net/bugs/323972
mention the requirement to install Dulwich.

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remote.py
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import urlparse
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import dulwich as git
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from dulwich.pack import PackData, Pack, PackIndex
 
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from dulwich.pack import PackData, Pack
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# Don't run any tests on GitSmartTransport as it is not intended to be 
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# a full implementation of Transport
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        raise NotLocalUrl(self.transport.base)
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class TemporaryPackIterator(Pack):
 
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class TemporaryPackIterator(object):
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    @property
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    def idx(self):
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        if self._idx is None:
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            self._data.create_index_v2(self._idx_path)
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            self._idx = PackIndex(self._idx_path)
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        return self._idx
 
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    def __init__(self, path):
 
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        self.path_data = path
 
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        basename = path[:-len(".pack")]
 
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        p = PackData(path)
 
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        self.path_idx = basename+".idx"
 
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        p.create_index_v2(self.path_idx)
 
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        self.pack = Pack(basename)
 
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        self._iter = self.pack.iterobjects()
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    def __del__(self):
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        os.remove(self._data_path)
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        os.remove(self._idx_path)
 
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        os.remove(self.path_data)
 
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        os.remove(self.path_idx)
 
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    def next(self):
 
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        return (self._iter.next(), None)
 
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    def __len__(self):
 
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        return len(self.pack)
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class RemoteGitRepository(GitRepository):
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        fd, path = tempfile.mkstemp(suffix=".pack")
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        self.fetch_pack(determine_wants, graph_walker, lambda x: os.write(fd, x), progress)
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        os.close(fd)
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        return TemporaryPackIterator(path[:-len(".pack")])
 
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        ret = TemporaryPackIterator(path)
 
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        return (len(ret), iter(ret.next, None))
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class RemoteGitBranch(GitBranch):