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53 lines
1.9 KiB
53 lines
1.9 KiB
9 months ago
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import os
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from leapp.libraries.stdlib import api, CalledProcessError, run
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def is_mdraid_dev(dev):
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"""
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Check if a given device is an md (Multiple Device) device
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It is expected that the "mdadm" command is available,
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if it's not it is assumed the device is not an md device.
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:return: True if the device is an md device, False otherwise
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:raises CalledProcessError: If an error occurred
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"""
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fail_msg = 'Could not check if device "{}" is an md device: {}'
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if not os.path.exists('/usr/sbin/mdadm'):
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api.current_logger().warning(fail_msg.format(
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dev, '/usr/sbin/mdadm is not installed.'
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))
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return False
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try:
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result = run(['mdadm', '--query', dev])
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except CalledProcessError as err:
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err.message = fail_msg.format(dev, err)
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raise # let the calling actor handle the exception
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return '--detail' in result['stdout']
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def get_component_devices(raid_dev):
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"""
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Get list of component devices in an md (Multiple Device) array
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:return: The list of component devices or None in case of error
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:raises ValueError: If the device is not an mdraid device
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"""
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try:
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# using both --verbose and --brief for medium verbosity
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result = run(['mdadm', '--detail', '--verbose', '--brief', raid_dev])
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except (OSError, CalledProcessError) as err:
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api.current_logger().warning(
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'Could not get md array component devices: {}'.format(err)
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)
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return None
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# example output:
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# 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
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# devices=/dev/vda1,/dev/vdb1
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if 'does not appear to be an md device' in result['stdout']:
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raise ValueError("Expected md device, but got: {}".format(raid_dev))
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return sorted(result['stdout'].rsplit('=', 2)[-1].strip().split(','))
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