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Merge destroy_tree from bzr.ab

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bzrlib/bzrdir.py
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        """
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        raise NotImplementedError(self.create_workingtree)
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    def destroy_workingtree(self, keep_files=False):
 
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        """Destroy the working tree at this BzrDir.
 
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        Formats that do not support this may raise UnsupportedOperation.
 
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        if keep_files is False, locally-modified files are unversioned,
 
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        and unmodified files are deleted, as per revert.
 
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        :param keep_files: If true, delete only the checkout metadata, not
 
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            the tree contents.
 
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        """
 
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        raise NotImplementedError(self.destroy_workingtree)
 
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    def find_repository(self):
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        """Find the repository that should be used for a_bzrdir.
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                result.set_parent_ids([revision_id])
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        return result
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    def destroy_workingtree(self, keep_files=False):
 
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        """See BzrDir.destroy_workingtree."""
 
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        raise errors.UnsupportedOperation(self.destroy_workingtree, self)
 
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    def get_branch_transport(self, branch_format):
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        """See BzrDir.get_branch_transport()."""
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        if branch_format is None:
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        from bzrlib.workingtree import WorkingTreeFormat
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        return WorkingTreeFormat.get_default_format().initialize(self, revision_id)
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    def destroy_workingtree(self, keep_files=False):
 
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        """See BzrDir.destroy_workingtree."""
 
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        wt = self.open_workingtree()
 
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        if keep_files is False:
 
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            repository = wt.branch.repository
 
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            empty = repository.revision_tree(bzrlib.revision.NULL_REVISION)
 
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            wt.revert([], old_tree=empty)
 
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        wt._control_files._transport.delete_tree('.')
 
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    def _get_mkdir_mode(self):
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        """Figure out the mode to use when creating a bzrdir subdir."""
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        temp_control = LockableFiles(self.transport, '', TransportLock)