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# Copyright (C) 2018 Facebook
#
# This file is part of libbtrfsutil.
#
# libbtrfsutil is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# libbtrfsutil is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with libbtrfsutil. If not, see <http://www.gnu.org/licenses/>.
import contextlib
import os
from pathlib import PurePath
import pwd
import subprocess
import tempfile
import unittest
HAVE_PATH_LIKE = hasattr(PurePath, '__fspath__')
try:
NOBODY_UID = pwd.getpwnam('nobody').pw_uid
skipUnlessHaveNobody = lambda func: func
except KeyError:
NOBODY_UID = None
skipUnlessHaveNobody = unittest.skip('must have nobody user')
@contextlib.contextmanager
def drop_privs():
try:
os.seteuid(NOBODY_UID)
yield
finally:
os.seteuid(0)
@contextlib.contextmanager
def regain_privs():
uid = os.geteuid()
if uid:
try:
os.seteuid(0)
yield
finally:
os.seteuid(uid)
else:
yield
@unittest.skipIf(os.geteuid() != 0, 'must be run as root')
class BtrfsTestCase(unittest.TestCase):
def __init__(self, *args, **kwds):
super().__init__(*args, **kwds)
self._mountpoints = []
def mount_btrfs(self):
mountpoint = tempfile.mkdtemp()
try:
with tempfile.NamedTemporaryFile(delete=False) as f:
os.truncate(f.fileno(), 1024 * 1024 * 1024)
image = f.name
except Exception as e:
os.rmdir(mountpoint)
raise e
if os.path.exists('../../mkfs.btrfs'):
mkfs = '../../mkfs.btrfs'
else:
mkfs = 'mkfs.btrfs'
try:
subprocess.check_call([mkfs, '-q', image])
subprocess.check_call(['mount', '-o', 'loop', '--', image, mountpoint])
except Exception as e:
os.rmdir(mountpoint)
os.remove(image)
raise e
self._mountpoints.append((mountpoint, image))
return mountpoint, image
def setUp(self):
self.mountpoint, self.image = self.mount_btrfs()
def tearDown(self):
for mountpoint, image in self._mountpoints:
subprocess.call(['umount', '-R', mountpoint])
os.rmdir(mountpoint)
os.remove(image)
@staticmethod
def path_or_fd(path, open_flags=os.O_RDONLY):
yield path
yield path.encode()
if HAVE_PATH_LIKE:
yield PurePath(path)
fd = os.open(path, open_flags)
try:
yield fd
finally:
os.close(fd)
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