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bzrlib/tests/per_pack_repository.py
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        finally:
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            tree.unlock()
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    def test_concurrent_pack_during_autopack(self):
 
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        tree = self.make_branch_and_tree('tree')
 
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        tree.lock_write()
 
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        try:
 
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            for i in xrange(9):
 
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                tree.commit('rev %d' % (i,))
 
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            r2 = repository.Repository.open('tree')
 
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            r2.lock_write()
 
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            try:
 
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                # Monkey patch so that pack occurs while the other repo is
 
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                # autopacking. This is slightly bad, but all current pack
 
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                # repository implementations have a _pack_collection, and we
 
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                # test that it gets triggered. So if a future format changes
 
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                # things, the test will fail rather than succeed accidentally.
 
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                autopack_count = [0]
 
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                r1 = tree.branch.repository
 
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                orig = r1._pack_collection.pack_distribution
 
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                def trigger_during_auto(*args, **kwargs):
 
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                    ret = orig(*args, **kwargs)
 
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                    if not autopack_count[0]:
 
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                        r2.pack()
 
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                    autopack_count[0] += 1
 
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                    return ret
 
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                r1._pack_collection.pack_distribution = trigger_during_auto
 
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                tree.commit('autopack-rev')
 
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                # This triggers 2 autopacks. The first one causes r2.pack() to
 
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                # fire, but r2 doesn't see the new pack file yet. The
 
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                # autopack restarts and sees there are 2 files and there
 
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                # should be only 1 for 10 commits. So it goes ahead and
 
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                # finishes autopacking.
 
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                self.assertEqual([2], autopack_count)
 
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            finally:
 
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                r2.unlock()
 
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        finally:
 
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            tree.unlock()
 
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    def test_lock_write_does_not_physically_lock(self):
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        repo = self.make_repository('.', format=self.get_format())
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        repo.lock_write()