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(jameinel) Allow 'bzr serve' to interpret SIGHUP as a graceful shutdown.
 (bug #795025) (John A Meinel)

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bzrlib/branch.py
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        The delta is relative to its mainline predecessor, or the
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        empty tree for revision 1.
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        """
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        try:
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            revid = self.get_rev_id(revno)
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        except errors.NoSuchRevision:
 
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        rh = self.revision_history()
 
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        if not (1 <= revno <= len(rh)):
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            raise errors.InvalidRevisionNumber(revno)
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        return self.repository.get_revision_delta(revid)
 
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        return self.repository.get_revision_delta(rh[revno-1])
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    def get_stacked_on_url(self):
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        """Get the URL this branch is stacked against.