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import os
from leapp.libraries.stdlib import api, CalledProcessError, run
def is_mdraid_dev(dev):
"""
Check if a given device is an md (Multiple Device) device
It is expected that the "mdadm" command is available,
if it's not it is assumed the device is not an md device.
:return: True if the device is an md device, False otherwise
:raises CalledProcessError: If an error occurred
"""
fail_msg = 'Could not check if device "{}" is an md device: {}'
if not os.path.exists('/usr/sbin/mdadm'):
api.current_logger().warning(fail_msg.format(
dev, '/usr/sbin/mdadm is not installed.'
))
return False
try:
result = run(['mdadm', '--query', dev])
except CalledProcessError as err:
err.message = fail_msg.format(dev, err)
raise # let the calling actor handle the exception
return '--detail' in result['stdout']
def get_component_devices(raid_dev):
"""
Get list of component devices in an md (Multiple Device) array
:return: The list of component devices or None in case of error
:raises ValueError: If the device is not an mdraid device
"""
try:
# using both --verbose and --brief for medium verbosity
result = run(['mdadm', '--detail', '--verbose', '--brief', raid_dev])
except (OSError, CalledProcessError) as err:
api.current_logger().warning(
'Could not get md array component devices: {}'.format(err)
)
return None
# example output:
# ARRAY /dev/md0 level=raid1 num-devices=2 metadata=1.2 name=localhost.localdomain:0 UUID=c4acea6e:d56e1598:91822e3f:fb26832c # noqa: E501; pylint: disable=line-too-long
# devices=/dev/vda1,/dev/vdb1
if 'does not appear to be an md device' in result['stdout']:
raise ValueError("Expected md device, but got: {}".format(raid_dev))
return sorted(result['stdout'].rsplit('=', 2)[-1].strip().split(','))