forked from Mirrors/btrfs-progs
109 lines
3.0 KiB
Python
109 lines
3.0 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 contextlib
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import os
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from pathlib import PurePath
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import pwd
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import subprocess
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import tempfile
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import unittest
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HAVE_PATH_LIKE = hasattr(PurePath, '__fspath__')
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try:
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NOBODY_UID = pwd.getpwnam('nobody').pw_uid
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skipUnlessHaveNobody = lambda func: func
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except KeyError:
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NOBODY_UID = None
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skipUnlessHaveNobody = unittest.skip('must have nobody user')
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@contextlib.contextmanager
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def drop_privs():
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try:
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os.seteuid(NOBODY_UID)
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yield
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finally:
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os.seteuid(0)
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@contextlib.contextmanager
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def regain_privs():
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uid = os.geteuid()
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if uid:
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try:
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os.seteuid(0)
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yield
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finally:
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os.seteuid(uid)
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else:
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yield
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@unittest.skipIf(os.geteuid() != 0, 'must be run as root')
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class BtrfsTestCase(unittest.TestCase):
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def __init__(self, *args, **kwds):
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super().__init__(*args, **kwds)
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self._mountpoints = []
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def mount_btrfs(self):
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mountpoint = tempfile.mkdtemp()
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try:
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with tempfile.NamedTemporaryFile(delete=False) as f:
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os.truncate(f.fileno(), 1024 * 1024 * 1024)
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image = f.name
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except Exception as e:
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os.rmdir(mountpoint)
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raise e
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if os.path.exists('../../mkfs.btrfs'):
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mkfs = '../../mkfs.btrfs'
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else:
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mkfs = 'mkfs.btrfs'
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try:
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subprocess.check_call([mkfs, '-q', image])
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subprocess.check_call(['mount', '-o', 'loop', '--', image, mountpoint])
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except Exception as e:
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os.rmdir(mountpoint)
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os.remove(image)
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raise e
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self._mountpoints.append((mountpoint, image))
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return mountpoint, image
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def setUp(self):
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self.mountpoint, self.image = self.mount_btrfs()
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def tearDown(self):
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for mountpoint, image in self._mountpoints:
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subprocess.call(['umount', '-R', mountpoint])
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os.rmdir(mountpoint)
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os.remove(image)
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@staticmethod
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def path_or_fd(path, open_flags=os.O_RDONLY):
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yield path
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yield path.encode()
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if HAVE_PATH_LIKE:
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yield PurePath(path)
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fd = os.open(path, open_flags)
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try:
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yield fd
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finally:
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os.close(fd)
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