def unmount_lvm2(vg):
"""
Remove logical volume data from system.
Parameters
----------
vg: dict
Volume group with list of logical volumes.
Returns
-------
bool: True on Success, exception otherwise.
"""
_logger.debug('__ Remove %s from system.' % vg)
try:
#
# make unavailable
for vg_name in list(vg.keys()):
vgchange_args = ['--activate', 'n', vg_name]
vgchange_res = system_tools.exec_vgchange(vgchange_args)
_logger.debug('vgchange: %s' % vgchange_res)
#
# remove physical volume: clear cache, if necessary
if system_tools.exec_pvscan(['--cache']):
_logger.debug('pvscan clear succeeded')
else:
_logger.error(' pvscan failed')
except Exception as e:
_logger.error(' Failed to release lvms %s: %s' % (vg, str(e)))
error_msg('Failed to release lvms %s: %s' % (vg, str(e)))
def unmount_imgfn(devname):
"""
Unlink a device.
Parameters
----------
devname: str
The device name
Returns
-------
bool: True on succes, raise an exception otherwise.
"""
_logger.debug('__ Unmount %s' % devname)
try:
#
# release device
qemucmd = ['-d', devname]
pause_msg(qemucmd)
qemunbd_ret = system_tools.exec_qemunbd(qemucmd)
if qemunbd_ret == 0:
_logger.debug('qemu-nbd %s succeeded: %d' % (qemucmd, qemunbd_ret))
else:
raise Exception('%s returned %d' % (qemucmd, qemunbd_ret))
#
# clear lvm cache, if necessary.
if system_tools.exec_pvscan(['--cache']):
_logger.debug('lvm cache updated')
else:
_logger.error(' Failed to clear LVM cache.')
raise OciMigrateException('Failed to clear LVM cache.')
#
# remove nbd module
if not system_tools.rm_nbd():
raise OciMigrateException('Failed to remove nbd module.')
else:
_logger.debug('Successfully removed nbd module.')
except Exception as e:
_logger.critical(' Something wrong with removing nbd devices: %s' %
str(e))
raise OciMigrateException('\nSomething wrong with removing nbd '
'devices: %s' % str(e))
return True
def mount_lvm2(devname):
"""
Create the mountpoints /mnt/<last part of lvm partitions> and mount the
partitions on those mountpoints, if possible.
Parameters
----------
devname: str
The full path of the device
Returns
-------
list: The list of mounted partitions.
?? need to collect lvm2 list this way??
"""
_logger.debug('__ Running mount lvm2 %s' % devname)
try:
_, nbcols = terminal_dimension()
mountwait = ProgressBar(int(nbcols),
0.2,
progress_chars=['mounting lvm'])
mountwait.start()
#
# physical volumes
if system_tools.exec_pvscan(['--cache'], devname):
_logger.debug('pvscan %s succeeded' % devname)
else:
_logger.critical(' pvscan %s failed' % devname)
#
pause_msg('pvscan test')
#
# volume groups
if system_tools.exec_vgscan(['--verbose']):
_logger.debug('vgscan succeeded')
else:
_logger.critical(' vgscan failed')
#
pause_msg('vgscan test')
#
# logical volumes
vgs = new_volume_groups()
if bool(vgs):
_logger.debug('lvscan succeeded: %s' % vgs)
else:
_logger.critical(' lvscan failed')
#
pause_msg('lvscan test')
#
# make available
vgchange_args = ['--activate', 'y']
vgchange_res = system_tools.exec_vgchange(vgchange_args)
_logger.debug('vgchange:\n%s' % vgchange_res)
#
pause_msg('vgchange_res test')
vgfound = False
if vgchange_res is not None:
for resline in vgchange_res.splitlines():
_logger.debug('vgchange line: %s' % resline)
for vg in list(vgs.keys()):
if vg in resline:
_logger.debug('vgfound set to True')
vgfound = True
else:
_logger.debug('vg %s not in l' % vg)
_logger.debug('vgchange: %s found: %s' % (vgchange_res, vgfound))
#
# for the sake of testing
pause_msg('vgchange_res test')
else:
_logger.critical(' vgchange failed')
return vgs
except Exception as e:
_logger.critical(' Mount lvm %s failed: %s' % (devname, str(e)))
raise OciMigrateException('Mount lvm %s failed: %s' %
(devname, str(e)))
finally:
if system_tools.is_thread_running(mountwait):
mountwait.stop()
