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Merge lp:bzr.

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bzrlib/workingtree.py
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    @needs_write_lock # because merge pulls data into the branch.
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    def merge_from_branch(self, branch, to_revision=None, from_revision=None,
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        merge_type=None):
 
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                          merge_type=None, force=False):
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        """Merge from a branch into this working tree.
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        :param branch: The branch to merge from.
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            merger = Merger(self.branch, this_tree=self, pb=pb)
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            merger.pp = ProgressPhase("Merge phase", 5, pb)
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            merger.pp.next_phase()
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            # check that there are no
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            # local alterations
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            merger.check_basis(check_clean=True, require_commits=False)
 
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            # check that there are no local alterations
 
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            if not force and self.has_changes():
 
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                raise errors.UncommittedChanges(self)
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            if to_revision is None:
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                to_revision = _mod_revision.ensure_null(branch.last_revision())
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            merger.other_rev_id = to_revision