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Merge bzr.dev

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bzrlib/branch.py
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            mainline_parent_id = revision_id
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        return BranchCheckResult(self)
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    def _get_checkout_format(self):
 
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        """Return the most suitable metadir for a checkout of this branch.
 
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        Weaves are used if this branch's repostory uses weaves.
 
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        """
 
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        if isinstance(self.bzrdir, bzrdir.BzrDirPreSplitOut):
 
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            from bzrlib import repository
 
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            format = bzrdir.BzrDirMetaFormat1()
 
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            format.repository_format = repository.RepositoryFormat7()
 
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        else:
 
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            format = self.repository.bzrdir.cloning_metadir()
 
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        return format
 
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    def create_checkout(self, to_location, revision_id=None, 
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                        lightweight=False):
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        """Create a checkout of a branch.
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        produce a bound branch (heavyweight checkout)
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        :return: The tree of the created checkout
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        """
 
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        t = transport.get_transport(to_location)
 
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        try:
 
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            t.mkdir('.')
 
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        except errors.FileExists:
 
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            pass
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        if lightweight:
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            t = transport.get_transport(to_location)
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            try:
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                t.mkdir('.')
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            except errors.FileExists:
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                pass
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            checkout = bzrdir.BzrDirMetaFormat1().initialize_on_transport(t)
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            BranchReferenceFormat().initialize(checkout, self)
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        else:
 
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            format = self._get_checkout_format()
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            checkout_branch = bzrdir.BzrDir.create_branch_convenience(
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                to_location, force_new_tree=False)
 
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                to_location, force_new_tree=False, format=format)
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            checkout = checkout_branch.bzrdir
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            checkout_branch.bind(self)
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            if revision_id is not None: