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# Copyright (C) 2006-2012, 2016 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Tests for LockDir"""
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from ..errors import (
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from ..lockdir import (
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from ..sixish import (
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TestCaseWithTransport,
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# These tests are run on the default transport provided by the test framework
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# (typically a local disk transport). That can be changed by the --transport
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# option to bzr selftest. The required properties of the transport
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# implementation are tested separately. (The main requirement is just that
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# they don't allow overwriting nonempty directories.)
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class TestLockDir(TestCaseWithTransport):
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"""Test LockDir operations"""
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def logging_report_function(self, fmt, *args):
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self._logged_reports.append((fmt, args))
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def setup_log_reporter(self, lock_dir):
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self._logged_reports = []
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lock_dir._report_function = self.logging_report_function
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def test_00_lock_creation(self):
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"""Creation of lock file on a transport"""
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t = self.get_transport()
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lf = LockDir(t, 'test_lock')
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self.assertFalse(lf.is_held)
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def test_01_lock_repr(self):
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"""Lock string representation"""
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lf = LockDir(self.get_transport(), 'test_lock')
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self.assertContainsRe(r, r'^LockDir\(.*/test_lock\)$')
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def test_02_unlocked_peek(self):
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lf = LockDir(self.get_transport(), 'test_lock')
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self.assertEqual(lf.peek(), None)
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return LockDir(self.get_transport(), 'test_lock')
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def test_unlock_after_break_raises(self):
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ld2.force_break(ld2.peek())
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self.assertRaises(LockBroken, ld.unlock)
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def test_03_readonly_peek(self):
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lf = LockDir(self.get_readonly_transport(), 'test_lock')
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self.assertEqual(lf.peek(), None)
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def test_10_lock_uncontested(self):
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"""Acquire and release a lock"""
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t = self.get_transport()
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lf = LockDir(t, 'test_lock')
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self.assertTrue(lf.is_held)
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self.assertFalse(lf.is_held)
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def test_11_create_readonly_transport(self):
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"""Fail to create lock on readonly transport"""
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t = self.get_readonly_transport()
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lf = LockDir(t, 'test_lock')
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self.assertRaises(LockFailed, lf.create)
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def test_12_lock_readonly_transport(self):
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"""Fail to lock on readonly transport"""
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lf = LockDir(self.get_transport(), 'test_lock')
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lf = LockDir(self.get_readonly_transport(), 'test_lock')
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self.assertRaises(LockFailed, lf.attempt_lock)
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def test_20_lock_contested(self):
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"""Contention to get a lock"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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lf2 = LockDir(t, 'test_lock')
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# locking is between LockDir instances; aliases within
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# a single process are not detected
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self.fail('Failed to detect lock collision')
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except LockContention as e:
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self.assertEqual(e.lock, lf2)
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self.assertContainsRe(str(e),
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r'^Could not acquire.*test_lock.*$')
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def test_20_lock_peek(self):
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"""Peek at the state of a lock"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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self.addCleanup(lf1.unlock)
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# lock is held, should get some info on it
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self.assertEqual(set(info1.info_dict.keys()),
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{'user', 'nonce', 'hostname', 'pid', 'start_time'})
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# should get the same info if we look at it through a different
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info2 = LockDir(t, 'test_lock').peek()
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self.assertEqual(info1, info2)
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# locks which are never used should be not-held
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self.assertEqual(LockDir(t, 'other_lock').peek(), None)
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def test_21_peek_readonly(self):
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"""Peek over a readonly transport"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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lf2 = LockDir(self.get_readonly_transport(), 'test_lock')
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self.assertEqual(lf2.peek(), None)
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self.addCleanup(lf1.unlock)
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self.assertTrue(info2)
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self.assertEqual(info2.get('nonce'), lf1.nonce)
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def test_30_lock_wait_fail(self):
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"""Wait on a lock, then fail
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We ask to wait up to 400ms; this should fail within at most one
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second. (Longer times are more realistic but we don't want the test
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suite to take too long, and this should do for now.)
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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lf2 = LockDir(t, 'test_lock')
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self.setup_log_reporter(lf2)
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self.assertRaises(LockContention, lf2.wait_lock,
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timeout=0.4, poll=0.1)
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# it should only take about 0.4 seconds, but we allow more time in
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# case the machine is heavily loaded
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self.assertTrue(after - before <= 8.0,
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"took %f seconds to detect lock contention" % (after - before))
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self.assertEqual(1, len(self._logged_reports))
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self.assertContainsRe(self._logged_reports[0][0],
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r'Unable to obtain lock .* held by jrandom@example\.com on .*'
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r' \(process #\d+\), acquired .* ago\.\n'
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r'Will continue to try until \d{2}:\d{2}:\d{2}, unless '
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r'you press Ctrl-C.\n'
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r'See "brz help break-lock" for more.')
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def test_31_lock_wait_easy(self):
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"""Succeed when waiting on a lock with no contention.
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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self.setup_log_reporter(lf1)
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lf1.wait_lock(timeout=0.4, poll=0.1)
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self.assertTrue(after - before <= 1.0)
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self.assertEqual([], self._logged_reports)
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def test_40_confirm_easy(self):
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"""Confirm a lock that's already held"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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self.addCleanup(lf1.unlock)
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def test_41_confirm_not_held(self):
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"""Confirm a lock that's already held"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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self.assertRaises(LockNotHeld, lf1.confirm)
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def test_42_confirm_broken_manually(self):
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"""Confirm a lock broken by hand"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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t.move('test_lock', 'lock_gone_now')
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self.assertRaises(LockBroken, lf1.confirm)
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t.move('lock_gone_now', 'test_lock')
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def test_43_break(self):
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"""Break a lock whose caller has forgotten it"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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# we incorrectly discard the lock object without unlocking it
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# someone else sees it's still locked
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lf2 = LockDir(t, 'test_lock')
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holder_info = lf2.peek()
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self.assertTrue(holder_info)
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lf2.force_break(holder_info)
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# now we should be able to take it
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self.addCleanup(lf2.unlock)
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def test_44_break_already_released(self):
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"""Lock break races with regular release"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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# someone else sees it's still locked
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lf2 = LockDir(t, 'test_lock')
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holder_info = lf2.peek()
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# in the interim the lock is released
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# break should succeed
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lf2.force_break(holder_info)
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# now we should be able to take it
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self.addCleanup(lf2.unlock)
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def test_45_break_mismatch(self):
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"""Lock break races with someone else acquiring it"""
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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# someone else sees it's still locked
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lf2 = LockDir(t, 'test_lock')
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holder_info = lf2.peek()
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# in the interim the lock is released
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lf3 = LockDir(t, 'test_lock')
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# break should now *fail*
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self.assertRaises(LockBreakMismatch, lf2.force_break,
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def test_46_fake_read_lock(self):
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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def test_50_lockdir_representation(self):
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"""Check the on-disk representation of LockDirs is as expected.
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There should always be a top-level directory named by the lock.
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When the lock is held, there should be a lockname/held directory
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containing an info file.
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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self.assertTrue(t.has('test_lock'))
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self.assertTrue(t.has('test_lock/held/info'))
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self.assertFalse(t.has('test_lock/held/info'))
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def test_break_lock(self):
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# the ui based break_lock routine should Just Work (tm)
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ld1 = self.get_lock()
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ld2 = self.get_lock()
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# do this without IO redirection to ensure it doesn't prompt.
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self.assertRaises(AssertionError, ld1.break_lock)
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orig_factory = breezy.ui.ui_factory
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breezy.ui.ui_factory = breezy.ui.CannedInputUIFactory([True])
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self.assertRaises(LockBroken, ld1.unlock)
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breezy.ui.ui_factory = orig_factory
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def test_break_lock_corrupt_info(self):
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"""break_lock works even if the info file is corrupt (and tells the UI
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ld2 = self.get_lock()
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ld.transport.put_bytes_non_atomic('test_lock/held/info', b'\0')
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class LoggingUIFactory(breezy.ui.SilentUIFactory):
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def get_boolean(self, prompt):
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self.prompts.append(('boolean', prompt))
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ui = LoggingUIFactory()
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self.overrideAttr(breezy.ui, 'ui_factory', ui)
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self.assertLength(1, ui.prompts)
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self.assertEqual('boolean', ui.prompts[0][0])
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self.assertStartsWith(ui.prompts[0][1], 'Break (corrupt LockDir')
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self.assertRaises(LockBroken, ld.unlock)
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def test_break_lock_missing_info(self):
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"""break_lock works even if the info file is missing (and tells the UI
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ld2 = self.get_lock()
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ld.transport.delete('test_lock/held/info')
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class LoggingUIFactory(breezy.ui.SilentUIFactory):
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def get_boolean(self, prompt):
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self.prompts.append(('boolean', prompt))
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ui = LoggingUIFactory()
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orig_factory = breezy.ui.ui_factory
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breezy.ui.ui_factory = ui
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self.assertRaises(LockBroken, ld.unlock)
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self.assertLength(0, ui.prompts)
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breezy.ui.ui_factory = orig_factory
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# Suppress warnings due to ld not being unlocked
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# XXX: if lock_broken hook was invoked in this case, this hack would
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# not be necessary. - Andrew Bennetts, 2010-09-06.
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del self._lock_actions[:]
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def test_create_missing_base_directory(self):
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"""If LockDir.path doesn't exist, it can be created
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Some people manually remove the entire lock/ directory trying
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to unlock a stuck repository/branch/etc. Rather than failing
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after that, just create the lock directory when needed.
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t = self.get_transport()
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lf1 = LockDir(t, 'test_lock')
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self.assertTrue(t.has('test_lock'))
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self.assertFalse(t.has('test_lock'))
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# This will create 'test_lock' if it needs to
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self.assertTrue(t.has('test_lock'))
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self.assertTrue(t.has('test_lock/held/info'))
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self.assertFalse(t.has('test_lock/held/info'))
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def test_display_form(self):
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ld1 = self.get_lock()
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info_list = ld1.peek().to_readable_dict()
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self.assertEqual(info_list['user'], u'jrandom@example.com')
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self.assertContainsRe(info_list['pid'], '^\\d+$')
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self.assertContainsRe(info_list['time_ago'], '^\\d+ seconds? ago$')
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def test_lock_without_email(self):
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global_config = config.GlobalStack()
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# Intentionally has no email address
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global_config.set('email', 'User Identity')
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ld1 = self.get_lock()
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def test_lock_permission(self):
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self.requireFeature(features.not_running_as_root)
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if not osutils.supports_posix_readonly():
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raise tests.TestSkipped('Cannot induce a permission failure')
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ld1 = self.get_lock()
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lock_path = ld1.transport.local_abspath('test_lock')
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osutils.make_readonly(lock_path)
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self.assertRaises(errors.LockFailed, ld1.attempt_lock)
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def test_lock_by_token(self):
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ld1 = self.get_lock()
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token = ld1.lock_write()
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self.addCleanup(ld1.unlock)
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self.assertNotEqual(None, token)
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ld2 = self.get_lock()
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t2 = ld2.lock_write(token)
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self.addCleanup(ld2.unlock)
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self.assertEqual(token, t2)
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def test_lock_with_buggy_rename(self):
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# test that lock acquisition handles servers which pretend they
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# renamed correctly but that actually fail
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t = transport.get_transport_from_url(
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'brokenrename+' + self.get_url())
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ld1 = LockDir(t, 'test_lock')
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ld2 = LockDir(t, 'test_lock')
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# we should fail to lock
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e = self.assertRaises(errors.LockContention, ld2.attempt_lock)
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# now the original caller should succeed in unlocking
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# and there should be nothing left over
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self.assertEqual([], t.list_dir('test_lock'))
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def test_failed_lock_leaves_no_trash(self):
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# if we fail to acquire the lock, we don't leave pending directories
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# behind -- https://bugs.launchpad.net/bzr/+bug/109169
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ld1 = self.get_lock()
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ld2 = self.get_lock()
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# should be nothing before we start
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t = self.get_transport().clone('test_lock')
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self.assertEqual(a, t.list_dir('.'))
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# when held, that's all we see
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self.addCleanup(ld1.unlock)
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# second guy should fail
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self.assertRaises(errors.LockContention, ld2.attempt_lock)
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def test_no_lockdir_info(self):
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"""We can cope with empty info files."""
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# This seems like a fairly common failure case - see
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# <https://bugs.launchpad.net/bzr/+bug/185103> and all its dupes.
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# Processes are often interrupted after opening the file
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# before the actual contents are committed.
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t = self.get_transport()
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t.mkdir('test_lock/held')
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t.put_bytes('test_lock/held/info', b'')
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lf = LockDir(t, 'test_lock')
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formatted_info = info.to_readable_dict()
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dict(user='<unknown>', hostname='<unknown>', pid='<unknown>',
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time_ago='(unknown)'),
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def test_corrupt_lockdir_info(self):
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"""We can cope with corrupt (and thus unparseable) info files."""
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# This seems like a fairly common failure case too - see
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# <https://bugs.launchpad.net/bzr/+bug/619872> for instance.
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# In particular some systems tend to fill recently created files with
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# nul bytes after recovering from a system crash.
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t = self.get_transport()
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t.mkdir('test_lock/held')
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t.put_bytes('test_lock/held/info', b'\0')
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lf = LockDir(t, 'test_lock')
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self.assertRaises(errors.LockCorrupt, lf.peek)
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# Currently attempt_lock gives LockContention, but LockCorrupt would be
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# a reasonable result too.
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(errors.LockCorrupt, errors.LockContention), lf.attempt_lock)
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self.assertRaises(errors.LockCorrupt, lf.validate_token, 'fake token')
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def test_missing_lockdir_info(self):
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"""We can cope with absent info files."""
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t = self.get_transport()
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t.mkdir('test_lock/held')
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lf = LockDir(t, 'test_lock')
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# In this case we expect the 'not held' result from peek, because peek
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# cannot be expected to notice that there is a 'held' directory with no
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self.assertEqual(None, lf.peek())
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# And lock/unlock may work or give LockContention (but not any other
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except LockContention:
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# LockContention is ok, and expected on Windows
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# no error is ok, and expected on POSIX (because POSIX allows
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# os.rename over an empty directory).
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# Currently raises TokenMismatch, but LockCorrupt would be reasonable
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(errors.TokenMismatch, errors.LockCorrupt),
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lf.validate_token, 'fake token')
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class TestLockDirHooks(TestCaseWithTransport):
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super(TestLockDirHooks, self).setUp()
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return LockDir(self.get_transport(), 'test_lock')
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def record_hook(self, result):
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self._calls.append(result)
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def test_LockDir_acquired_success(self):
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# the LockDir.lock_acquired hook fires when a lock is acquired.
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LockDir.hooks.install_named_hook('lock_acquired',
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self.record_hook, 'record_hook')
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self.assertEqual([], self._calls)
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result = ld.attempt_lock()
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lock_path = ld.transport.abspath(ld.path)
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self.assertEqual([lock.LockResult(lock_path, result)], self._calls)
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self.assertEqual([lock.LockResult(lock_path, result)], self._calls)
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def test_LockDir_acquired_fail(self):
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# the LockDir.lock_acquired hook does not fire on failure.
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ld2 = self.get_lock()
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# install a lock hook now, when the disk lock is locked
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LockDir.hooks.install_named_hook('lock_acquired',
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self.record_hook, 'record_hook')
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self.assertRaises(errors.LockContention, ld.attempt_lock)
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self.assertEqual([], self._calls)
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self.assertEqual([], self._calls)
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def test_LockDir_released_success(self):
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# the LockDir.lock_released hook fires when a lock is acquired.
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LockDir.hooks.install_named_hook('lock_released',
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self.record_hook, 'record_hook')
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self.assertEqual([], self._calls)
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result = ld.attempt_lock()
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self.assertEqual([], self._calls)
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lock_path = ld.transport.abspath(ld.path)
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self.assertEqual([lock.LockResult(lock_path, result)], self._calls)
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def test_LockDir_released_fail(self):
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# the LockDir.lock_released hook does not fire on failure.
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ld2 = self.get_lock()
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ld2.force_break(ld2.peek())
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LockDir.hooks.install_named_hook('lock_released',
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self.record_hook, 'record_hook')
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self.assertRaises(LockBroken, ld.unlock)
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self.assertEqual([], self._calls)
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def test_LockDir_broken_success(self):
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# the LockDir.lock_broken hook fires when a lock is broken.
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ld2 = self.get_lock()
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result = ld.attempt_lock()
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LockDir.hooks.install_named_hook('lock_broken',
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self.record_hook, 'record_hook')
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ld2.force_break(ld2.peek())
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lock_path = ld.transport.abspath(ld.path)
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self.assertEqual([lock.LockResult(lock_path, result)], self._calls)
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def test_LockDir_broken_failure(self):
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# the LockDir.lock_broken hook does not fires when a lock is already
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ld2 = self.get_lock()
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result = ld.attempt_lock()
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holder_info = ld2.peek()
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LockDir.hooks.install_named_hook('lock_broken',
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self.record_hook, 'record_hook')
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ld2.force_break(holder_info)
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lock_path = ld.transport.abspath(ld.path)
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self.assertEqual([], self._calls)
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class TestLockHeldInfo(TestCaseInTempDir):
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"""Can get information about the lock holder, and detect whether they're
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info = LockHeldInfo.for_this_process(None)
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self.assertContainsRe(repr(info), r"LockHeldInfo\(.*\)")
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def test_unicode(self):
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info = LockHeldInfo.for_this_process(None)
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self.assertContainsRe(text_type(info),
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r'held by .* on .* \(process #\d+\), acquired .* ago')
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def test_is_locked_by_this_process(self):
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info = LockHeldInfo.for_this_process(None)
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self.assertTrue(info.is_locked_by_this_process())
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def test_is_not_locked_by_this_process(self):
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info = LockHeldInfo.for_this_process(None)
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info.info_dict['pid'] = '123123123123123'
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self.assertFalse(info.is_locked_by_this_process())
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def test_lock_holder_live_process(self):
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"""Detect that the holder (this process) is still running."""
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info = LockHeldInfo.for_this_process(None)
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self.assertFalse(info.is_lock_holder_known_dead())
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def test_lock_holder_dead_process(self):
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"""Detect that the holder (this process) is still running."""
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self.overrideAttr(lockdir, 'get_host_name',
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lambda: 'aproperhostname')
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info = LockHeldInfo.for_this_process(None)
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info.info_dict['pid'] = '123123123'
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self.assertTrue(info.is_lock_holder_known_dead())
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def test_lock_holder_other_machine(self):
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"""The lock holder isn't here so we don't know if they're alive."""
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info = LockHeldInfo.for_this_process(None)
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info.info_dict['hostname'] = 'egg.example.com'
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info.info_dict['pid'] = '123123123'
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self.assertFalse(info.is_lock_holder_known_dead())
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def test_lock_holder_other_user(self):
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"""Only auto-break locks held by this user."""
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info = LockHeldInfo.for_this_process(None)
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info.info_dict['user'] = 'notme@example.com'
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info.info_dict['pid'] = '123123123'
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self.assertFalse(info.is_lock_holder_known_dead())
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def test_no_good_hostname(self):
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"""Correctly handle ambiguous hostnames.
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If the lock's recorded with just 'localhost' we can't really trust
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it's the same 'localhost'. (There are quite a few of them. :-)
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So even if the process is known not to be alive, we can't say that's
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self.overrideAttr(lockdir, 'get_host_name',
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info = LockHeldInfo.for_this_process(None)
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info.info_dict['pid'] = '123123123'
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self.assertFalse(info.is_lock_holder_known_dead())
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class TestStaleLockDir(TestCaseWithTransport):
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"""Can automatically break stale locks.
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:see: https://bugs.launchpad.net/bzr/+bug/220464
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def test_auto_break_stale_lock(self):
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"""Locks safely known to be stale are just cleaned up.
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This generates a warning but no other user interaction.
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self.overrideAttr(lockdir, 'get_host_name',
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lambda: 'aproperhostname')
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# Stealing dead locks is enabled by default.
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# Create a lock pretending to come from a different nonexistent
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# process on the same machine.
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l1 = LockDir(self.get_transport(), 'a',
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extra_holder_info={'pid': '12312313'})
743
token_1 = l1.attempt_lock()
744
l2 = LockDir(self.get_transport(), 'a')
745
token_2 = l2.attempt_lock()
746
# l1 will notice its lock was stolen.
747
self.assertRaises(errors.LockBroken,
751
def test_auto_break_stale_lock_configured_off(self):
752
"""Automatic breaking can be turned off"""
753
l1 = LockDir(self.get_transport(), 'a',
754
extra_holder_info={'pid': '12312313'})
755
# Stealing dead locks is enabled by default, so disable it.
756
config.GlobalStack().set('locks.steal_dead', False)
757
token_1 = l1.attempt_lock()
758
self.addCleanup(l1.unlock)
759
l2 = LockDir(self.get_transport(), 'a')
760
# This fails now, because dead lock breaking is disabled.
761
self.assertRaises(LockContention,
763
# and it's in fact not broken
added
removed
breezy/tests/test_lockdir.py
