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raid.py
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raid.py
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# Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library. If not, see <http://www.gnu.org/licenses/>.
from vyos.utils.disk import device_from_id
from vyos.utils.process import cmd
def raid_sets():
"""
Returns a list of RAID sets
"""
with open('/proc/mdstat') as f:
return [line.split()[0].rstrip(':') for line in f if line.startswith('md')]
def raid_set_members(raid_set_name: str):
"""
Returns a list of members of a RAID set
"""
with open('/proc/mdstat') as f:
for line in f:
if line.startswith(raid_set_name):
return [l.split('[')[0] for l in line.split()[4:]]
return []
def partitions():
"""
Returns a list of partitions
"""
with open('/proc/partitions') as f:
p = [l.strip().split()[-1] for l in list(f) if l.strip()]
p.remove('name')
return p
def add_raid_member(raid_set_name: str, member: str, by_id: bool = False):
"""
Add a member to an existing RAID set
"""
if by_id:
member = device_from_id(member)
if raid_set_name not in raid_sets():
raise ValueError(f"RAID set {raid_set_name} does not exist")
if member not in partitions():
raise ValueError(f"Partition {member} does not exist")
if member in raid_set_members(raid_set_name):
raise ValueError(f"Partition {member} is already a member of RAID set {raid_set_name}")
cmd(f'mdadm --add /dev/{raid_set_name} /dev/{member}')
disk = cmd(f'lsblk -ndo PKNAME /dev/{member}')
cmd(f'grub-install /dev/{disk}')
def delete_raid_member(raid_set_name: str, member: str, by_id: bool = False):
"""
Delete a member from an existing RAID set
"""
if by_id:
member = device_from_id(member)
if raid_set_name not in raid_sets():
raise ValueError(f"RAID set {raid_set_name} does not exist")
if member not in raid_set_members(raid_set_name):
raise ValueError(f"Partition {member} is not a member of RAID set {raid_set_name}")
cmd(f'mdadm --remove /dev/{raid_set_name} /dev/{member}')

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