forked from Mirrors/btrfs-progs
493 lines
20 KiB
Python
493 lines
20 KiB
Python
# Copyright (C) 2018 Facebook
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#
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# This file is part of libbtrfsutil.
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#
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# libbtrfsutil is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# libbtrfsutil 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 Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with libbtrfsutil. If not, see <http://www.gnu.org/licenses/>.
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import fcntl
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import errno
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import os
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import os.path
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from pathlib import PurePath
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import subprocess
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import traceback
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import btrfsutil
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from tests import (
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BtrfsTestCase,
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drop_privs,
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HAVE_PATH_LIKE,
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NOBODY_UID,
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regain_privs,
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skipUnlessHaveNobody,
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)
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class TestSubvolume(BtrfsTestCase):
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def test_is_subvolume(self):
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dir = os.path.join(self.mountpoint, 'foo')
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os.mkdir(dir)
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for arg in self.path_or_fd(self.mountpoint):
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with self.subTest(type=type(arg)):
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self.assertTrue(btrfsutil.is_subvolume(arg))
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for arg in self.path_or_fd(dir):
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with self.subTest(type=type(arg)):
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self.assertFalse(btrfsutil.is_subvolume(arg))
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with self.assertRaises(btrfsutil.BtrfsUtilError) as e:
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btrfsutil.is_subvolume(os.path.join(self.mountpoint, 'bar'))
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# This is a bit of an implementation detail, but really this is testing
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# that the exception is initialized correctly.
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self.assertEqual(e.exception.btrfsutilerror, btrfsutil.ERROR_STATFS_FAILED)
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self.assertEqual(e.exception.errno, errno.ENOENT)
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def test_subvolume_id(self):
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dir = os.path.join(self.mountpoint, 'foo')
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os.mkdir(dir)
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for arg in self.path_or_fd(self.mountpoint):
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with self.subTest(type=type(arg)):
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self.assertEqual(btrfsutil.subvolume_id(arg), 5)
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for arg in self.path_or_fd(dir):
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with self.subTest(type=type(arg)):
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self.assertEqual(btrfsutil.subvolume_id(arg), 5)
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def test_subvolume_path(self):
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btrfsutil.create_subvolume(os.path.join(self.mountpoint, 'subvol1'))
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os.mkdir(os.path.join(self.mountpoint, 'dir1'))
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os.mkdir(os.path.join(self.mountpoint, 'dir1/dir2'))
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btrfsutil.create_subvolume(os.path.join(self.mountpoint, 'dir1/dir2/subvol2'))
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btrfsutil.create_subvolume(os.path.join(self.mountpoint, 'dir1/dir2/subvol2/subvol3'))
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os.mkdir(os.path.join(self.mountpoint, 'subvol1/dir3'))
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btrfsutil.create_subvolume(os.path.join(self.mountpoint, 'subvol1/dir3/subvol4'))
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for arg in self.path_or_fd(self.mountpoint):
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with self.subTest(type=type(arg)):
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self.assertEqual(btrfsutil.subvolume_path(arg), '')
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self.assertEqual(btrfsutil.subvolume_path(arg, 5), '')
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self.assertEqual(btrfsutil.subvolume_path(arg, 256), 'subvol1')
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self.assertEqual(btrfsutil.subvolume_path(arg, 257), 'dir1/dir2/subvol2')
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self.assertEqual(btrfsutil.subvolume_path(arg, 258), 'dir1/dir2/subvol2/subvol3')
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self.assertEqual(btrfsutil.subvolume_path(arg, 259), 'subvol1/dir3/subvol4')
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pwd = os.getcwd()
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try:
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os.chdir(self.mountpoint)
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path = ''
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for i in range(26):
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name = chr(ord('a') + i) * 255
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path = os.path.join(path, name)
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btrfsutil.create_subvolume(name)
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os.chdir(name)
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self.assertEqual(btrfsutil.subvolume_path('.'), path)
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finally:
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os.chdir(pwd)
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def _test_subvolume_info(self, subvol, snapshot):
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for arg in self.path_or_fd(self.mountpoint):
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with self.subTest(type=type(arg)):
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info = btrfsutil.subvolume_info(arg)
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self.assertEqual(info.id, 5)
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self.assertEqual(info.parent_id, 0)
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self.assertEqual(info.dir_id, 0)
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self.assertEqual(info.flags, 0)
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self.assertIsInstance(info.uuid, bytes)
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self.assertEqual(len(info.uuid), 16)
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self.assertEqual(info.parent_uuid, bytes(16))
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self.assertEqual(info.received_uuid, bytes(16))
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self.assertNotEqual(info.generation, 0)
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self.assertGreaterEqual(info.ctransid, 0)
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self.assertEqual(info.otransid, 0)
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self.assertEqual(info.stransid, 0)
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self.assertEqual(info.rtransid, 0)
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self.assertIsInstance(info.ctime, float)
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self.assertIsInstance(info.otime, float)
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self.assertEqual(info.stime, 0)
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self.assertEqual(info.rtime, 0)
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info = btrfsutil.subvolume_info(subvol)
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self.assertEqual(info.id, 256)
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self.assertEqual(info.parent_id, 5)
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self.assertEqual(info.dir_id, 256)
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self.assertEqual(info.flags, 0)
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self.assertIsInstance(info.uuid, bytes)
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self.assertEqual(len(info.uuid), 16)
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self.assertEqual(info.parent_uuid, bytes(16))
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self.assertEqual(info.received_uuid, bytes(16))
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self.assertNotEqual(info.generation, 0)
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self.assertNotEqual(info.ctransid, 0)
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self.assertNotEqual(info.otransid, 0)
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self.assertEqual(info.stransid, 0)
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self.assertEqual(info.rtransid, 0)
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self.assertNotEqual(info.ctime, 0)
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self.assertNotEqual(info.otime, 0)
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self.assertEqual(info.stime, 0)
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self.assertEqual(info.rtime, 0)
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subvol_uuid = info.uuid
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info = btrfsutil.subvolume_info(snapshot)
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self.assertEqual(info.parent_uuid, subvol_uuid)
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# TODO: test received_uuid, stransid, rtransid, stime, and rtime
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def test_subvolume_info(self):
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subvol = os.path.join(self.mountpoint, 'subvol')
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btrfsutil.create_subvolume(subvol)
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snapshot = os.path.join(self.mountpoint, 'snapshot')
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btrfsutil.create_snapshot(subvol, snapshot)
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self._test_subvolume_info(subvol, snapshot)
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for arg in self.path_or_fd(self.mountpoint):
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with self.subTest(type=type(arg)):
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with self.assertRaises(btrfsutil.BtrfsUtilError) as e:
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# BTRFS_EXTENT_TREE_OBJECTID
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btrfsutil.subvolume_info(arg, 2)
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self.assertEqual(e.exception.btrfsutilerror,
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btrfsutil.ERROR_SUBVOLUME_NOT_FOUND)
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@skipUnlessHaveNobody
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def test_subvolume_info_unprivileged(self):
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subvol = os.path.join(self.mountpoint, 'subvol')
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btrfsutil.create_subvolume(subvol)
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snapshot = os.path.join(self.mountpoint, 'snapshot')
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btrfsutil.create_snapshot(subvol, snapshot)
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with drop_privs():
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try:
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self._test_subvolume_info(subvol, snapshot)
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except OSError as e:
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if e.errno == errno.ENOTTY:
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self.skipTest('BTRFS_IOC_GET_SUBVOL_INFO is not available')
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else:
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raise
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def test_read_only(self):
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for arg in self.path_or_fd(self.mountpoint):
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with self.subTest(type=type(arg)):
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btrfsutil.set_subvolume_read_only(arg)
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self.assertTrue(btrfsutil.get_subvolume_read_only(arg))
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self.assertTrue(btrfsutil.subvolume_info(arg).flags & 1)
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btrfsutil.set_subvolume_read_only(arg, False)
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self.assertFalse(btrfsutil.get_subvolume_read_only(arg))
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self.assertFalse(btrfsutil.subvolume_info(arg).flags & 1)
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btrfsutil.set_subvolume_read_only(arg, True)
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self.assertTrue(btrfsutil.get_subvolume_read_only(arg))
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self.assertTrue(btrfsutil.subvolume_info(arg).flags & 1)
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btrfsutil.set_subvolume_read_only(arg, False)
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def test_default_subvolume(self):
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for arg in self.path_or_fd(self.mountpoint):
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with self.subTest(type=type(arg)):
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self.assertEqual(btrfsutil.get_default_subvolume(arg), 5)
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subvol = os.path.join(self.mountpoint, 'subvol')
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btrfsutil.create_subvolume(subvol)
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for arg in self.path_or_fd(subvol):
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with self.subTest(type=type(arg)):
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btrfsutil.set_default_subvolume(arg)
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self.assertEqual(btrfsutil.get_default_subvolume(arg), 256)
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btrfsutil.set_default_subvolume(arg, 5)
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self.assertEqual(btrfsutil.get_default_subvolume(arg), 5)
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def test_create_subvolume(self):
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subvol = os.path.join(self.mountpoint, 'subvol')
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btrfsutil.create_subvolume(subvol + '1')
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self.assertTrue(btrfsutil.is_subvolume(subvol + '1'))
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btrfsutil.create_subvolume((subvol + '2').encode())
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self.assertTrue(btrfsutil.is_subvolume(subvol + '2'))
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if HAVE_PATH_LIKE:
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btrfsutil.create_subvolume(PurePath(subvol + '3'))
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self.assertTrue(btrfsutil.is_subvolume(subvol + '3'))
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pwd = os.getcwd()
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try:
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os.chdir(self.mountpoint)
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btrfsutil.create_subvolume('subvol4')
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self.assertTrue(btrfsutil.is_subvolume('subvol4'))
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finally:
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os.chdir(pwd)
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btrfsutil.create_subvolume(subvol + '5/')
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self.assertTrue(btrfsutil.is_subvolume(subvol + '5'))
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btrfsutil.create_subvolume(subvol + '6//')
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self.assertTrue(btrfsutil.is_subvolume(subvol + '6'))
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transid = btrfsutil.create_subvolume(subvol + '7', async_=True)
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self.assertTrue(btrfsutil.is_subvolume(subvol + '7'))
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self.assertGreater(transid, 0)
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# Test creating subvolumes under '/' in a chroot.
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pid = os.fork()
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if pid == 0:
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try:
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os.chroot(self.mountpoint)
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os.chdir('/')
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btrfsutil.create_subvolume('/subvol8')
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self.assertTrue(btrfsutil.is_subvolume('/subvol8'))
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with self.assertRaises(btrfsutil.BtrfsUtilError):
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btrfsutil.create_subvolume('/')
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os._exit(0)
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except Exception:
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traceback.print_exc()
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os._exit(1)
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wstatus = os.waitpid(pid, 0)[1]
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self.assertTrue(os.WIFEXITED(wstatus))
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self.assertEqual(os.WEXITSTATUS(wstatus), 0)
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def test_create_snapshot(self):
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subvol = os.path.join(self.mountpoint, 'subvol')
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btrfsutil.create_subvolume(subvol)
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os.mkdir(os.path.join(subvol, 'dir'))
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for i, arg in enumerate(self.path_or_fd(subvol)):
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with self.subTest(type=type(arg)):
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snapshots_dir = os.path.join(self.mountpoint, 'snapshots{}'.format(i))
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os.mkdir(snapshots_dir)
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snapshot = os.path.join(snapshots_dir, 'snapshot')
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btrfsutil.create_snapshot(subvol, snapshot + '1')
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self.assertTrue(btrfsutil.is_subvolume(snapshot + '1'))
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self.assertTrue(os.path.exists(os.path.join(snapshot + '1', 'dir')))
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btrfsutil.create_snapshot(subvol, (snapshot + '2').encode())
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self.assertTrue(btrfsutil.is_subvolume(snapshot + '2'))
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self.assertTrue(os.path.exists(os.path.join(snapshot + '2', 'dir')))
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if HAVE_PATH_LIKE:
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btrfsutil.create_snapshot(subvol, PurePath(snapshot + '3'))
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self.assertTrue(btrfsutil.is_subvolume(snapshot + '3'))
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self.assertTrue(os.path.exists(os.path.join(snapshot + '3', 'dir')))
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nested_subvol = os.path.join(subvol, 'nested')
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more_nested_subvol = os.path.join(nested_subvol, 'more_nested')
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btrfsutil.create_subvolume(nested_subvol)
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btrfsutil.create_subvolume(more_nested_subvol)
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os.mkdir(os.path.join(more_nested_subvol, 'nested_dir'))
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snapshot = os.path.join(self.mountpoint, 'snapshot')
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btrfsutil.create_snapshot(subvol, snapshot + '1')
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# Dummy subvolume.
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self.assertEqual(os.stat(os.path.join(snapshot + '1', 'nested')).st_ino, 2)
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self.assertFalse(os.path.exists(os.path.join(snapshot + '1', 'nested', 'more_nested')))
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btrfsutil.create_snapshot(subvol, snapshot + '2', recursive=True)
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self.assertTrue(os.path.exists(os.path.join(snapshot + '2', 'nested/more_nested/nested_dir')))
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transid = btrfsutil.create_snapshot(subvol, snapshot + '3', recursive=True, async_=True)
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self.assertTrue(os.path.exists(os.path.join(snapshot + '3', 'nested/more_nested/nested_dir')))
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self.assertGreater(transid, 0)
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btrfsutil.create_snapshot(subvol, snapshot + '4', read_only=True)
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self.assertTrue(btrfsutil.get_subvolume_read_only(snapshot + '4'))
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def test_delete_subvolume(self):
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subvol = os.path.join(self.mountpoint, 'subvol')
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btrfsutil.create_subvolume(subvol + '1')
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self.assertTrue(os.path.exists(subvol + '1'))
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btrfsutil.create_subvolume(subvol + '2')
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self.assertTrue(os.path.exists(subvol + '2'))
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btrfsutil.create_subvolume(subvol + '3')
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self.assertTrue(os.path.exists(subvol + '3'))
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btrfsutil.delete_subvolume(subvol + '1')
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self.assertFalse(os.path.exists(subvol + '1'))
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btrfsutil.delete_subvolume((subvol + '2').encode())
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self.assertFalse(os.path.exists(subvol + '2'))
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if HAVE_PATH_LIKE:
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btrfsutil.delete_subvolume(PurePath(subvol + '3'))
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self.assertFalse(os.path.exists(subvol + '3'))
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# Test deleting subvolumes under '/' in a chroot.
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pid = os.fork()
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if pid == 0:
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try:
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os.chroot(self.mountpoint)
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os.chdir('/')
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btrfsutil.create_subvolume('/subvol4')
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self.assertTrue(os.path.exists('/subvol4'))
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btrfsutil.delete_subvolume('/subvol4')
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self.assertFalse(os.path.exists('/subvol4'))
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with self.assertRaises(btrfsutil.BtrfsUtilError):
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btrfsutil.delete_subvolume('/')
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os._exit(0)
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except Exception:
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traceback.print_exc()
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os._exit(1)
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wstatus = os.waitpid(pid, 0)[1]
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self.assertTrue(os.WIFEXITED(wstatus))
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self.assertEqual(os.WEXITSTATUS(wstatus), 0)
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btrfsutil.create_subvolume(subvol + '5')
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btrfsutil.create_subvolume(subvol + '5/foo')
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btrfsutil.create_subvolume(subvol + '5/bar')
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btrfsutil.create_subvolume(subvol + '5/bar/baz')
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btrfsutil.create_subvolume(subvol + '5/bar/qux')
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btrfsutil.create_subvolume(subvol + '5/quux')
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with self.assertRaises(btrfsutil.BtrfsUtilError):
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btrfsutil.delete_subvolume(subvol + '5')
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btrfsutil.delete_subvolume(subvol + '5', recursive=True)
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self.assertFalse(os.path.exists(subvol + '5'))
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def test_deleted_subvolumes(self):
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subvol = os.path.join(self.mountpoint, 'subvol')
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btrfsutil.create_subvolume(subvol + '1')
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btrfsutil.delete_subvolume(subvol + '1')
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for arg in self.path_or_fd(self.mountpoint):
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with self.subTest(type=type(arg)):
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self.assertEqual(btrfsutil.deleted_subvolumes(arg), [256])
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def _test_subvolume_iterator(self):
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btrfsutil.create_subvolume('foo')
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with btrfsutil.SubvolumeIterator('.', info=True) as it:
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path, subvol = next(it)
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self.assertEqual(path, 'foo')
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self.assertIsInstance(subvol, btrfsutil.SubvolumeInfo)
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self.assertEqual(subvol.id, 256)
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self.assertEqual(subvol.parent_id, 5)
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self.assertRaises(StopIteration, next, it)
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btrfsutil.create_subvolume('foo/bar')
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btrfsutil.create_subvolume('foo/bar/baz')
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subvols = [
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('foo', 256),
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('foo/bar', 257),
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('foo/bar/baz', 258),
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]
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for arg in self.path_or_fd('.'):
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with self.subTest(type=type(arg)), btrfsutil.SubvolumeIterator(arg) as it:
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self.assertEqual(list(it), subvols)
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with btrfsutil.SubvolumeIterator('.', top=0) as it:
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self.assertEqual(list(it), subvols)
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if os.geteuid() == 0:
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with btrfsutil.SubvolumeIterator('foo', top=5) as it:
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self.assertEqual(list(it), subvols)
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with btrfsutil.SubvolumeIterator('.', post_order=True) as it:
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self.assertEqual(list(it),
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[('foo/bar/baz', 258),
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('foo/bar', 257),
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('foo', 256)])
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subvols = [
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('bar', 257),
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('bar/baz', 258),
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]
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if os.geteuid() == 0:
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with btrfsutil.SubvolumeIterator('.', top=256) as it:
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self.assertEqual(list(it), subvols)
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with btrfsutil.SubvolumeIterator('foo') as it:
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self.assertEqual(list(it), subvols)
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with btrfsutil.SubvolumeIterator('foo', top=0) as it:
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self.assertEqual(list(it), subvols)
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os.rename('foo/bar/baz', 'baz')
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os.mkdir('dir')
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btrfsutil.create_subvolume('dir/qux')
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os.mkdir('dir/qux/dir2')
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btrfsutil.create_subvolume('dir/qux/dir2/quux')
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subvols = [
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('baz', 258),
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('dir/qux', 259),
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('dir/qux/dir2/quux', 260),
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('foo', 256),
|
|
('foo/bar', 257),
|
|
]
|
|
|
|
# Test various corner cases of the unprivileged implementation
|
|
# where we can't access the subvolume.
|
|
if os.geteuid() != 0:
|
|
with regain_privs():
|
|
# We don't have permission to traverse the path.
|
|
os.mkdir('directory_perms', 0o700)
|
|
btrfsutil.create_subvolume('directory_perms/subvol')
|
|
|
|
# We don't have permission to resolve the subvolume path.
|
|
os.mkdir('subvol_perms', 0o755)
|
|
btrfsutil.create_subvolume('subvol_perms/subvol')
|
|
os.chmod('subvol_perms/subvol', 0o700)
|
|
|
|
# The path doesn't exist.
|
|
os.mkdir('enoent', 0o755)
|
|
btrfsutil.create_subvolume('enoent/subvol')
|
|
subprocess.check_call(['mount', '-t', 'tmpfs', 'tmpfs', 'enoent'])
|
|
|
|
# The path exists but it's not a subvolume.
|
|
os.mkdir('notsubvol', 0o755)
|
|
btrfsutil.create_subvolume('notsubvol/subvol')
|
|
subprocess.check_call(['mount', '-t', 'tmpfs', 'tmpfs', 'notsubvol'])
|
|
os.mkdir('notsubvol/subvol')
|
|
|
|
# The path exists and is a subvolume, but on a different
|
|
# filesystem.
|
|
os.mkdir('wrongfs', 0o755)
|
|
btrfsutil.create_subvolume('wrongfs/subvol')
|
|
other_mountpoint, _ = self.mount_btrfs()
|
|
subprocess.check_call(['mount', '--bind', '--',
|
|
other_mountpoint, 'wrongfs/subvol'])
|
|
|
|
# The path exists and is a subvolume on the same
|
|
# filesystem, but not the right one.
|
|
os.mkdir('wrongsubvol', 0o755)
|
|
btrfsutil.create_subvolume('wrongsubvol/subvol')
|
|
subprocess.check_call(['mount', '--bind', 'baz', 'wrongsubvol/subvol'])
|
|
|
|
|
|
with btrfsutil.SubvolumeIterator('.') as it:
|
|
self.assertEqual(sorted(it), subvols)
|
|
with btrfsutil.SubvolumeIterator('.', post_order=True) as it:
|
|
self.assertEqual(sorted(it), subvols)
|
|
|
|
with btrfsutil.SubvolumeIterator('.') as it:
|
|
self.assertGreaterEqual(it.fileno(), 0)
|
|
it.close()
|
|
with self.assertRaises(ValueError):
|
|
next(iter(it))
|
|
with self.assertRaises(ValueError):
|
|
it.fileno()
|
|
it.close()
|
|
|
|
def test_subvolume_iterator(self):
|
|
pwd = os.getcwd()
|
|
try:
|
|
os.chdir(self.mountpoint)
|
|
self._test_subvolume_iterator()
|
|
finally:
|
|
os.chdir(pwd)
|
|
|
|
@skipUnlessHaveNobody
|
|
def test_subvolume_iterator_unprivileged(self):
|
|
os.chown(self.mountpoint, NOBODY_UID, -1)
|
|
pwd = os.getcwd()
|
|
try:
|
|
os.chdir(self.mountpoint)
|
|
with drop_privs():
|
|
self._test_subvolume_iterator()
|
|
finally:
|
|
os.chdir(pwd)
|