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Start WorkingTree -> .bzr/checkout transition

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bzrlib/bzrdir.py
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        """
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        raise NotImplementedError(self.get_branch_transport)
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    def get_workingtree_transport(self, branch_format):
 
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        """Get the transport for use by workingtree format in this BzrDir.
 
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        Note that bzr dirs that do not support format strings will raise
 
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        IncompatibleFormat if the workingtree format they are given has
 
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        a format string, and vice verca.
 
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        If workingtree_format is None, the transport is returned with no 
 
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        checking. if it is not None, then the returned transport is
 
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        guaranteed to point to an existing directory ready for use.
 
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        """
 
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        raise NotImplementedError(self.get_workingtree_transport)
 
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    def __init__(self, _transport, _format):
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        """Initialize a Bzr control dir object.
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            return self.transport
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        raise errors.IncompatibleFormat(branch_format, self._format)
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    def get_workingtree_transport(self, workingtree_format):
 
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        """See BzrDir.get_workingtree_transport()."""
 
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        if workingtree_format is None:
 
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            return self.transport
 
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        try:
 
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            workingtree_format.get_format_string()
 
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        except NotImplementedError:
 
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            return self.transport
 
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        raise errors.IncompatibleFormat(workingtree_format, self._format)
 
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    def open_branch(self, unsupported=False):
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        """See BzrDir.open_branch."""
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        from bzrlib.branch import BzrBranchFormat4
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            pass
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        return self.transport.clone('branch')
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    def get_workingtree_transport(self, workingtree_format):
 
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        """See BzrDir.get_workingtree_transport()."""
 
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        if workingtree_format is None:
 
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            return self.transport.clone('checkout')
 
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        try:
 
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            workingtree_format.get_format_string()
 
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        except NotImplementedError:
 
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            raise errors.IncompatibleFormat(workingtree_format, self._format)
 
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        try:
 
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            self.transport.mkdir('checkout')
 
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        except errors.FileExists:
 
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            pass
 
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        return self.transport.clone('checkout')
 
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    def open_branch(self, unsupported=False):
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        """See BzrDir.open_branch."""
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        from bzrlib.branch import BranchFormat