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Viewing changes to build/lib.linux-x86_64-2.6/bzrlib/tests/per_lock/test_lock.py

  • Committer: thitipong at ndrsolution
  • Date: 2011-11-14 06:31:02 UTC
  • Revision ID: thitipong@ndrsolution.com-20111114063102-9obte3yfi2azku7d
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build/lib.linux-x86_64-2.6/bzrlib/tests/per_lock/test_lock.py
 
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# Copyright (C) 2007 Canonical Ltd
 
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#
 
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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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#
 
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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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#
 
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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 OS level locks."""
 
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from bzrlib import (
 
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    errors,
 
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    osutils,
 
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    )
 
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from bzrlib.tests import (features, UnicodeFilenameFeature)
 
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from bzrlib.tests.per_lock import TestCaseWithLock
 
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class TestLock(TestCaseWithLock):
 
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    def setUp(self):
 
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        super(TestLock, self).setUp()
 
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        self.build_tree(['a-file'])
 
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    def test_read_lock(self):
 
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        """Smoke test for read locks."""
 
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        a_lock = self.read_lock('a-file')
 
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        self.addCleanup(a_lock.unlock)
 
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        # The lock file should be opened for reading
 
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        txt = a_lock.f.read()
 
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        self.assertEqual('contents of a-file\n', txt)
 
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    def test_create_if_needed_read(self):
 
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        """We will create the file if it doesn't exist yet."""
 
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        a_lock = self.read_lock('other-file')
 
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        self.addCleanup(a_lock.unlock)
 
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        txt = a_lock.f.read()
 
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        self.assertEqual('', txt)
 
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    def test_create_if_needed_write(self):
 
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        """We will create the file if it doesn't exist yet."""
 
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        a_lock = self.write_lock('other-file')
 
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        self.addCleanup(a_lock.unlock)
 
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        txt = a_lock.f.read()
 
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        self.assertEqual('', txt)
 
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        a_lock.f.seek(0)
 
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        a_lock.f.write('foo\n')
 
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        a_lock.f.seek(0)
 
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        txt = a_lock.f.read()
 
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        self.assertEqual('foo\n', txt)
 
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    def test_readonly_file(self):
 
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        """If the file is readonly, we can take a read lock.
 
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        But we shouldn't be able to take a write lock.
 
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        """
 
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        self.requireFeature(features.not_running_as_root)
 
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        osutils.make_readonly('a-file')
 
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        # Make sure the file is read-only (on all platforms)
 
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        self.assertRaises(IOError, open, 'a-file', 'rb+')
 
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        a_lock = self.read_lock('a-file')
 
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        a_lock.unlock()
 
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        self.assertRaises(errors.LockFailed, self.write_lock, 'a-file')
 
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    def test_write_lock(self):
 
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        """Smoke test for write locks."""
 
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        a_lock = self.write_lock('a-file')
 
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        self.addCleanup(a_lock.unlock)
 
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        # You should be able to read and write to the lock file.
 
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        txt = a_lock.f.read()
 
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        self.assertEqual('contents of a-file\n', txt)
 
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        # Win32 requires that you call seek() when switching between a read
 
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        # operation and a write operation.
 
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        a_lock.f.seek(0, 2)
 
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        a_lock.f.write('more content\n')
 
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        a_lock.f.seek(0)
 
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        txt = a_lock.f.read()
 
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        self.assertEqual('contents of a-file\nmore content\n', txt)
 
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    def test_multiple_read_locks(self):
 
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        """You can take out more than one read lock on the same file."""
 
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        a_lock = self.read_lock('a-file')
 
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        self.addCleanup(a_lock.unlock)
 
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        b_lock = self.read_lock('a-file')
 
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        self.addCleanup(b_lock.unlock)
 
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    def test_multiple_write_locks_exclude(self):
 
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        """Taking out more than one write lock should fail."""
 
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        a_lock = self.write_lock('a-file')
 
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        self.addCleanup(a_lock.unlock)
 
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        # Taking out a lock on a locked file should raise LockContention
 
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        self.assertRaises(errors.LockContention, self.write_lock, 'a-file')
 
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    def _disabled_test_read_then_write_excludes(self):
 
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        """If a file is read-locked, taking out a write lock should fail."""
 
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        a_lock = self.read_lock('a-file')
 
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        self.addCleanup(a_lock.unlock)
 
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        # Taking out a lock on a locked file should raise LockContention
 
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        self.assertRaises(errors.LockContention, self.write_lock, 'a-file')
 
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    def test_read_unlock_write(self):
 
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        """Make sure that unlocking allows us to lock write"""
 
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        a_lock = self.read_lock('a-file')
 
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        a_lock.unlock()
 
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        a_lock = self.write_lock('a-file')
 
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        a_lock.unlock()
 
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    # TODO: jam 20070319 fcntl read locks are not currently fully
 
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    #       mutually exclusive with write locks. This will be fixed
 
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    #       in the next release.
 
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    def _disabled_test_write_then_read_excludes(self):
 
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        """If a file is write-locked, taking out a read lock should fail.
 
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        The file is exclusively owned by the write lock, so we shouldn't be
 
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        able to take out a shared read lock.
 
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        """
 
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        a_lock = self.write_lock('a-file')
 
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        self.addCleanup(a_lock.unlock)
 
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        # Taking out a lock on a locked file should raise LockContention
 
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        self.assertRaises(errors.LockContention, self.read_lock, 'a-file')
 
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    # TODO: jam 20070319 fcntl write locks are not currently fully
 
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    #       mutually exclusive with read locks. This will be fixed
 
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    #       in the next release.
 
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    def _disabled_test_write_unlock_read(self):
 
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        """If we have removed the write lock, we can grab a read lock."""
 
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        a_lock = self.write_lock('a-file')
 
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        a_lock.unlock()
 
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        a_lock = self.read_lock('a-file')
 
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        a_lock.unlock()
 
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    def _disabled_test_multiple_read_unlock_write(self):
 
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        """We can only grab a write lock if all read locks are done."""
 
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        a_lock = b_lock = c_lock = None
 
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        try:
 
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            a_lock = self.read_lock('a-file')
 
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            b_lock = self.read_lock('a-file')
 
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            self.assertRaises(errors.LockContention, self.write_lock, 'a-file')
 
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            a_lock.unlock()
 
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            a_lock = None
 
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            self.assertRaises(errors.LockContention, self.write_lock, 'a-file')
 
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            b_lock.unlock()
 
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            b_lock = None
 
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            c_lock = self.write_lock('a-file')
 
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            c_lock.unlock()
 
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            c_lock = None
 
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        finally:
 
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            # Cleanup as needed
 
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            if a_lock is not None:
 
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                a_lock.unlock()
 
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            if b_lock is not None:
 
162
                b_lock.unlock()
 
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            if c_lock is not None:
 
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                c_lock.unlock()
 
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166
 
 
167
class TestLockUnicodePath(TestCaseWithLock):
 
168
 
 
169
    _test_needs_features = [UnicodeFilenameFeature]
 
170
 
 
171
    def test_read_lock(self):
 
172
        self.build_tree([u'\u1234'])
 
173
        u_lock = self.read_lock(u'\u1234')
 
174
        self.addCleanup(u_lock.unlock)
 
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176
    def test_write_lock(self):
 
177
        self.build_tree([u'\u1234'])
 
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        u_lock = self.write_lock(u'\u1234')
 
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        self.addCleanup(u_lock.unlock)