def _remove_thin_device(name):
"""
Destroys a thin device via subprocess call.
"""
r = util.subp(['dmsetup', 'remove', '--retry', name])
if r.return_code != 0:
raise MountError('Could not remove thin device:\n' + r.stderr)
def _remove_thin_device(name):
"""
Destroys a thin device via subprocess call.
"""
r = util.subp(['dmsetup', 'remove', '--retry', name])
if r.return_code != 0:
raise MountError('Could not remove thin device:\n' + r.stderr)
def _mount_overlay(self, identifier, options):
"""
OverlayFS mount backend.
"""
if os.geteuid() != 0:
raise MountError('Insufficient privileges to mount device.')
if self.live:
raise MountError('The OverlayFS backend does not support live '
'mounts.')
elif 'rw' in options:
raise MountError('The OverlayFS backend does not support '
'writeable mounts.')
cid = self._identifier_as_cid(identifier)
cinfo = self.client.inspect_container(cid)
ld, ud, wd = '', '', ''
try:
ld = cinfo['GraphDriver']['Data']['lowerDir']
ud = cinfo['GraphDriver']['Data']['upperDir']
wd = cinfo['GraphDriver']['Data']['workDir']
except:
ld, ud, wd = DockerMount._no_gd_api_overlay(cid)
options += ['ro', 'lowerdir=' + ld, 'upperdir=' + ud, 'workdir=' + wd]
optstring = ','.join(options)
cmd = ['mount', '-t', 'overlay', '-o', optstring, 'overlay',
self.mountpoint]
status = util.subp(cmd)
if status.return_code != 0:
self._cleanup_container(cinfo)
raise MountError('Failed to mount OverlayFS device.\n' +
status.stderr.decode(sys.getdefaultencoding()))
def unmount_path(path):
"""
Unmounts the directory specified by path.
"""
r = util.subp(['umount', path])
if r.return_code != 0:
raise ValueError(r.stderr)
def unmount_path(path):
"""
Unmounts the directory specified by path.
"""
r = util.subp(['umount', path])
if r.return_code != 0:
raise ValueError(r.stderr)
def _get_fs(thin_pathname):
"""
Returns the file system type (xfs, ext4) of a given device
"""
cmd = ['lsblk', '-o', 'FSTYPE', '-n', thin_pathname]
fs_return = util.subp(cmd)
return fs_return.stdout.strip()
def _get_fs(thin_pathname):
"""
Returns the file system type (xfs, ext4) of a given device
"""
cmd = ['lsblk', '-o', 'FSTYPE', '-n', thin_pathname]
fs_return = util.subp(cmd)
return fs_return.stdout.strip()
def get_dev_at_mountpoint(mntpoint):
"""
Retrieves the device mounted at mntpoint, or raises
MountError if none.
"""
results = util.subp(['findmnt', '-o', 'SOURCE', mntpoint])
if results.return_code != 0:
raise MountError('No device mounted at ' + mntpoint)
return results.stdout.replace('SOURCE\n', '').strip().split('\n')[-1]
def get_dev_at_mountpoint(mntpoint):
"""
Retrieves the device mounted at mntpoint, or raises
MountError if none.
"""
results = util.subp(['findmnt', '-o', 'SOURCE', mntpoint])
if results.return_code != 0:
raise MountError('No device mounted at ' + mntpoint)
return results.stdout.replace('SOURCE\n', '').strip().split('\n')[-1]
def _activate_thin_device(name, dm_id, size, pool):
"""
Provisions an LVM device-mapper thin device reflecting,
DM device id 'dm_id' in the docker pool.
"""
table = '0 {0} thin /dev/mapper/{1} {2}'.format(int(size) / 512,
pool, dm_id)
cmd = ['dmsetup', 'create', name, '--table', table]
r = util.subp(cmd)
if r.return_code != 0:
raise MountError('Failed to create thin device: ' + r.stderr)
def _is_device_active(device):
"""
Checks dmsetup to see if a device is already active
"""
cmd = ['dmsetup', 'info', device]
dmsetup_info = util.subp(cmd)
for dm_line in dmsetup_info.stdout.split("\n"):
line = dm_line.split(':')
if ('State' in line[0].strip()) and ('ACTIVE' in line[1].strip()):
return True
return False
def _is_device_active(device):
"""
Checks dmsetup to see if a device is already active
"""
cmd = ['dmsetup', 'info', device]
dmsetup_info = util.subp(cmd)
for dm_line in dmsetup_info.stdout.split("\n"):
line = dm_line.split(':')
if ('State' in line[0].strip()) and ('ACTIVE' in line[1].strip()):
return True
return False
def _activate_thin_device(name, dm_id, size, pool):
"""
Provisions an LVM device-mapper thin device reflecting,
DM device id 'dm_id' in the docker pool.
"""
table = '0 {0} thin /dev/mapper/{1} {2}'.format(
int(size) / 512, pool, dm_id)
cmd = ['dmsetup', 'create', name, '--table', table]
r = util.subp(cmd)
if r.return_code != 0:
raise MountError('Failed to create thin device: ' + r.stderr)
def mount_path(source, target, optstring='', bind=False):
"""
Subprocess call to mount dev at path.
"""
cmd = ['mount']
if bind:
cmd.append('--bind')
if optstring:
cmd.append('-o')
cmd.append(optstring)
cmd.append(source)
cmd.append(target)
r = util.subp(cmd)
if r.return_code != 0:
raise MountError('Could not mount docker container:\n' +
' '.join(cmd) + '\n' + r.stderr)
def mount_path(source, target, optstring='', bind=False):
"""
Subprocess call to mount dev at path.
"""
cmd = ['mount']
if bind:
cmd.append('--bind')
if optstring:
cmd.append('-o')
cmd.append(optstring)
cmd.append(source)
cmd.append(target)
r = util.subp(cmd)
if r.return_code != 0:
raise MountError('Could not mount docker container:\n' +
' '.join(cmd) + '\n' + r.stderr)
def _get_overlay_mount_cid(self):
"""
Returns the cid of the container mounted at mountpoint.
"""
cmd = ['findmnt', '-o', 'OPTIONS', '-n', self.mountpoint]
r = util.subp(cmd)
if r.return_code != 0:
raise MountError('No devices mounted at that location.')
optstring = r.stdout.strip().split('\n')[-1]
upperdir = [o.replace('upperdir=', '') for o in optstring.split(',')
if o.startswith('upperdir=')][0]
cdir = upperdir.rsplit('/', 1)[0]
if not cdir.startswith('/var/lib/docker/overlay/'):
raise MountError('The device mounted at that location is not a '
'docker container.')
return cdir.replace('/var/lib/docker/overlay/', '')
def _get_overlay_mount_cid(self):
"""
Returns the cid of the container mounted at mountpoint.
"""
cmd = ['findmnt', '-o', 'OPTIONS', '-n', self.mountpoint]
r = util.subp(cmd)
if r.return_code != 0:
raise MountError('No devices mounted at that location.')
optstring = r.stdout.strip().split('\n')[-1]
upperdir = [
o.replace('upperdir=', '') for o in optstring.split(',')
if o.startswith('upperdir=')
][0]
cdir = upperdir.rsplit('/', 1)[0]
if not cdir.startswith('/var/lib/docker/overlay/'):
raise MountError('The device mounted at that location is not a '
'docker container.')
return cdir.replace('/var/lib/docker/overlay/', '')
def _mount_overlay(self, identifier, options):
"""
OverlayFS mount backend.
"""
if os.geteuid() != 0:
raise MountError('Insufficient privileges to mount device.')
if self.live:
raise MountError('The OverlayFS backend does not support live '
'mounts.')
elif 'rw' in options:
raise MountError('The OverlayFS backend does not support '
'writeable mounts.')
cid = self._identifier_as_cid(identifier)
cinfo = self.client.inspect_container(cid)
ld, ud, wd = '', '', ''
try:
ld = cinfo['GraphDriver']['Data']['lowerDir']
ud = cinfo['GraphDriver']['Data']['upperDir']
wd = cinfo['GraphDriver']['Data']['workDir']
except:
ld, ud, wd = DockerMount._no_gd_api_overlay(cid)
options += ['ro', 'lowerdir=' + ld, 'upperdir=' + ud, 'workdir=' + wd]
optstring = ','.join(options)
cmd = [
'mount', '-t', 'overlay', '-o', optstring, 'overlay',
self.mountpoint
]
status = util.subp(cmd)
if status.return_code != 0:
self._cleanup_container(cinfo)
raise MountError('Failed to mount OverlayFS device.\n' +
status.stderr.decode(sys.getdefaultencoding()))
