def mount_devpts(newroot, target, **mnt_opts):
"""Mounts directory on devpts.
"""
while target.startswith('/'):
target = target[1:]
mount.mount(source='devpts',
target=os.path.join(newroot, target),
fs_type='devpts',
mnt_flags=(mount.MS_NOSUID, mount.MS_NOEXEC),
**mnt_opts)
os.chmod(os.path.join(newroot, target, 'ptmx'), 0o666)
def mount_bind(newroot, target, source=None, recursive=True, read_only=True):
"""Bind mounts `source` to `newroot/target` so that `source` is accessed
when reaching `newroot/target`.
If a directory, the source will be mounted using --rbind.
"""
# Ensure root directory exists
if not os.path.exists(newroot):
raise exc.ContainerSetupError('Path %r does not exist' % newroot)
if source is None:
source = target
target = fs.norm_safe(target)
source = fs.norm_safe(source)
# Make sure target directory exists.
if not os.path.exists(source):
raise exc.ContainerSetupError('Source path %r does not exist' % source)
mnt_flags = [mount.MS_BIND]
# Use --rbind for directories and --bind for files.
if recursive and os.path.isdir(source):
mnt_flags.append(mount.MS_REC)
# Strip leading /, ensure that mount is relative path.
while target.startswith('/'):
target = target[1:]
# Create mount directory, make sure it does not exists.
target_fp = os.path.join(newroot, target)
if os.path.isdir(source):
fs.mkdir_safe(target_fp)
else:
fs.mkfile_safe(target_fp)
res = mount.mount(source=source,
target=target_fp,
fs_type=None,
mnt_flags=mnt_flags)
if res == 0 and read_only:
res = mount.mount(source=None,
target=target_fp,
fs_type=None,
mnt_flags=(mount.MS_BIND, mount.MS_RDONLY,
mount.MS_REMOUNT))
return res
def mount_move(target, source):
"""Move a mount from one to a point to another.
"""
return mount.mount(source=source,
target=target,
fs_type=None,
mnt_flags=[mount.MS_MOVE])
def mount_tmpfs(newroot,
target,
nodev=True,
noexec=True,
nosuid=True,
relatime=True,
**mnt_opts):
"""Mounts directory on tmpfs.
"""
while target.startswith('/'):
target = target[1:]
mnt_flags = [
(nodev, mount.MS_NODEV),
(noexec, mount.MS_NOEXEC),
(nosuid, mount.MS_NOSUID),
(relatime, mount.MS_RELATIME),
]
return mount.mount(
source='tmpfs',
target=os.path.join(newroot, target),
fs_type='tmpfs',
mnt_flags=[mnt_flag for flag, mnt_flag in mnt_flags if flag],
**mnt_opts)
def mount_proc(newroot, target='proc'):
"""Mounts /proc directory on newroot.
"""
while target.startswith('/'):
target = target[1:]
return mount.mount(source='proc',
target=os.path.join(newroot, target),
fs_type='proc')
def mount_mqueue(newroot, target, **mnt_opts):
"""Mounts directory on mqueue.
"""
while target.startswith('/'):
target = target[1:]
return mount.mount(source='mqueue',
target=os.path.join(newroot, target),
fs_type='mqueue',
mnt_flags=(mount.MS_NOSUID, mount.MS_NODEV,
mount.MS_NOEXEC),
**mnt_opts)
def mount_filesystem(block_dev, target_dir, fs_type='ext4'):
"""Mount filesystem on target directory.
:param block_dev:
Block device to mount
"""
return mount.mount(source=block_dev,
target=target_dir,
fs_type=fs_type,
mnt_flags=(
mount.MS_NOATIME,
mount.MS_NODIRATIME,
))
def mount_sysfs(newroot, target='sys', read_only=True):
"""Mounts /sysfs directory on newroot.
"""
while target.startswith('/'):
target = target[1:]
mnt_flags = []
if read_only:
mnt_flags.append(mount.MS_RDONLY)
return mount.mount(source='sysfs',
target=os.path.join(newroot, target),
fs_type='sysfs',
mnt_flags=mnt_flags)
def mount_tmpfs(newroot, target, **mnt_opts):
"""Mounts directory on tmpfs.
"""
while target.startswith('/'):
target = target[1:]
mnt_flags = [
mount.MS_NODEV,
mount.MS_NOEXEC,
mount.MS_NOSUID,
mount.MS_RELATIME,
]
return mount.mount(source='tmpfs',
target=os.path.join(newroot, target),
fs_type='tmpfs',
mnt_flags=mnt_flags,
**mnt_opts)
def mount_tmpfs(newroot, target, size=None):
"""Mounts directory on tmpfs.
"""
while target.startswith('/'):
target = target[1:]
mnt_opts = {}
if size is not None:
mnt_opts['size'] = size
return mount.mount(source='tmpfs',
target=os.path.join(newroot, target),
fs_type='tmpfs',
mnt_flags=(
mount.MS_NOATIME,
mount.MS_NODIRATIME,
),
mnt_opts=mnt_opts)
def mount_procfs(newroot, target='/proc'):
"""Mounts procfs on directory.
"""
while target.startswith('/'):
target = target[1:]
mnt_flags = [
mount.MS_NODEV,
mount.MS_NOEXEC,
mount.MS_NOSUID,
mount.MS_RELATIME,
]
return mount.mount(
source='proc',
target=os.path.join(newroot, target),
fs_type='proc',
mnt_flags=mnt_flags,
)
