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homeserver/ansible_collections/community/general/plugins/modules/system/lvg.py
mg c648a48c4c systemd: sanoid (#346) 
Co-authored-by: Michael Grote <michael.grote@posteo.de>
Reviewed-on: mg/ansible#346
Co-authored-by: mg <michael.grote@posteo.de>
Co-committed-by: mg <michael.grote@posteo.de>
2022-04-03 11:04:27 +02:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright: (c) 2013, Alexander Bulimov <lazywolf0@gmail.com>
# Based on lvol module by Jeroen Hoekx <jeroen.hoekx@dsquare.be>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = r'''
---
author:
- Alexander Bulimov (@abulimov)
module: lvg
short_description: Configure LVM volume groups
description:
- This module creates, removes or resizes volume groups.
options:
vg:
description:
- The name of the volume group.
type: str
required: true
pvs:
description:
- List of comma-separated devices to use as physical devices in this volume group.
- Required when creating or resizing volume group.
- The module will take care of running pvcreate if needed.
type: list
elements: str
pesize:
description:
- "The size of the physical extent. I(pesize) must be a power of 2 of at least 1 sector
(where the sector size is the largest sector size of the PVs currently used in the VG),
or at least 128KiB."
- Since Ansible 2.6, pesize can be optionally suffixed by a UNIT (k/K/m/M/g/G), default unit is megabyte.
type: str
default: "4"
pv_options:
description:
- Additional options to pass to C(pvcreate) when creating the volume group.
type: str
pvresize:
description:
- If C(yes), resize the physical volume to the maximum available size.
type: bool
default: false
version_added: '0.2.0'
vg_options:
description:
- Additional options to pass to C(vgcreate) when creating the volume group.
type: str
state:
description:
- Control if the volume group exists.
type: str
choices: [ absent, present ]
default: present
force:
description:
- If C(yes), allows to remove volume group with logical volumes.
type: bool
default: no
seealso:
- module: community.general.filesystem
- module: community.general.lvol
- module: community.general.parted
notes:
- This module does not modify PE size for already present volume group.
'''
EXAMPLES = r'''
- name: Create a volume group on top of /dev/sda1 with physical extent size = 32MB
community.general.lvg:
vg: vg.services
pvs: /dev/sda1
pesize: 32
- name: Create a volume group on top of /dev/sdb with physical extent size = 128KiB
community.general.lvg:
vg: vg.services
pvs: /dev/sdb
pesize: 128K
# If, for example, we already have VG vg.services on top of /dev/sdb1,
# this VG will be extended by /dev/sdc5. Or if vg.services was created on
# top of /dev/sda5, we first extend it with /dev/sdb1 and /dev/sdc5,
# and then reduce by /dev/sda5.
- name: Create or resize a volume group on top of /dev/sdb1 and /dev/sdc5.
community.general.lvg:
vg: vg.services
pvs: /dev/sdb1,/dev/sdc5
- name: Remove a volume group with name vg.services
community.general.lvg:
vg: vg.services
state: absent
- name: Create a volume group on top of /dev/sda3 and resize the volume group /dev/sda3 to the maximum possible
community.general.lvg:
vg: resizableVG
pvs: /dev/sda3
pvresize: yes
'''
import itertools
import os
from ansible.module_utils.basic import AnsibleModule
def parse_vgs(data):
vgs = []
for line in data.splitlines():
parts = line.strip().split(';')
vgs.append({
'name': parts[0],
'pv_count': int(parts[1]),
'lv_count': int(parts[2]),
})
return vgs
def find_mapper_device_name(module, dm_device):
dmsetup_cmd = module.get_bin_path('dmsetup', True)
mapper_prefix = '/dev/mapper/'
rc, dm_name, err = module.run_command("%s info -C --noheadings -o name %s" % (dmsetup_cmd, dm_device))
if rc != 0:
module.fail_json(msg="Failed executing dmsetup command.", rc=rc, err=err)
mapper_device = mapper_prefix + dm_name.rstrip()
return mapper_device
def parse_pvs(module, data):
pvs = []
dm_prefix = '/dev/dm-'
for line in data.splitlines():
parts = line.strip().split(';')
if parts[0].startswith(dm_prefix):
parts[0] = find_mapper_device_name(module, parts[0])
pvs.append({
'name': parts[0],
'vg_name': parts[1],
})
return pvs
def main():
module = AnsibleModule(
argument_spec=dict(
vg=dict(type='str', required=True),
pvs=dict(type='list', elements='str'),
pesize=dict(type='str', default='4'),
pv_options=dict(type='str', default=''),
pvresize=dict(type='bool', default=False),
vg_options=dict(type='str', default=''),
state=dict(type='str', default='present', choices=['absent', 'present']),
force=dict(type='bool', default=False),
),
supports_check_mode=True,
)
vg = module.params['vg']
state = module.params['state']
force = module.boolean(module.params['force'])
pvresize = module.boolean(module.params['pvresize'])
pesize = module.params['pesize']
pvoptions = module.params['pv_options'].split()
vgoptions = module.params['vg_options'].split()
dev_list = []
if module.params['pvs']:
dev_list = list(module.params['pvs'])
elif state == 'present':
module.fail_json(msg="No physical volumes given.")
# LVM always uses real paths not symlinks so replace symlinks with actual path
for idx, dev in enumerate(dev_list):
dev_list[idx] = os.path.realpath(dev)
if state == 'present':
# check given devices
for test_dev in dev_list:
if not os.path.exists(test_dev):
module.fail_json(msg="Device %s not found." % test_dev)
# get pv list
pvs_cmd = module.get_bin_path('pvs', True)
if dev_list:
pvs_filter_pv_name = ' || '.join(
'pv_name = {0}'.format(x)
for x in itertools.chain(dev_list, module.params['pvs'])
)
pvs_filter_vg_name = 'vg_name = {0}'.format(vg)
pvs_filter = "--select '{0} || {1}' ".format(pvs_filter_pv_name, pvs_filter_vg_name)
else:
pvs_filter = ''
rc, current_pvs, err = module.run_command("%s --noheadings -o pv_name,vg_name --separator ';' %s" % (pvs_cmd, pvs_filter))
if rc != 0:
module.fail_json(msg="Failed executing pvs command.", rc=rc, err=err)
# check pv for devices
pvs = parse_pvs(module, current_pvs)
used_pvs = [pv for pv in pvs if pv['name'] in dev_list and pv['vg_name'] and pv['vg_name'] != vg]
if used_pvs:
module.fail_json(msg="Device %s is already in %s volume group." % (used_pvs[0]['name'], used_pvs[0]['vg_name']))
vgs_cmd = module.get_bin_path('vgs', True)
rc, current_vgs, err = module.run_command("%s --noheadings -o vg_name,pv_count,lv_count --separator ';'" % vgs_cmd)
if rc != 0:
module.fail_json(msg="Failed executing vgs command.", rc=rc, err=err)
changed = False
vgs = parse_vgs(current_vgs)
for test_vg in vgs:
if test_vg['name'] == vg:
this_vg = test_vg
break
else:
this_vg = None
if this_vg is None:
if state == 'present':
# create VG
if module.check_mode:
changed = True
else:
# create PV
pvcreate_cmd = module.get_bin_path('pvcreate', True)
for current_dev in dev_list:
rc, dummy, err = module.run_command([pvcreate_cmd] + pvoptions + ['-f', str(current_dev)])
if rc == 0:
changed = True
else:
module.fail_json(msg="Creating physical volume '%s' failed" % current_dev, rc=rc, err=err)
vgcreate_cmd = module.get_bin_path('vgcreate')
rc, dummy, err = module.run_command([vgcreate_cmd] + vgoptions + ['-s', pesize, vg] + dev_list)
if rc == 0:
changed = True
else:
module.fail_json(msg="Creating volume group '%s' failed" % vg, rc=rc, err=err)
else:
if state == 'absent':
if module.check_mode:
module.exit_json(changed=True)
else:
if this_vg['lv_count'] == 0 or force:
# remove VG
vgremove_cmd = module.get_bin_path('vgremove', True)
rc, dummy, err = module.run_command("%s --force %s" % (vgremove_cmd, vg))
if rc == 0:
module.exit_json(changed=True)
else:
module.fail_json(msg="Failed to remove volume group %s" % (vg), rc=rc, err=err)
else:
module.fail_json(msg="Refuse to remove non-empty volume group %s without force=yes" % (vg))
# resize VG
current_devs = [os.path.realpath(pv['name']) for pv in pvs if pv['vg_name'] == vg]
devs_to_remove = list(set(current_devs) - set(dev_list))
devs_to_add = list(set(dev_list) - set(current_devs))
if current_devs:
if state == 'present' and pvresize:
for device in current_devs:
pvresize_cmd = module.get_bin_path('pvresize', True)
pvdisplay_cmd = module.get_bin_path('pvdisplay', True)
pvdisplay_ops = ["--units", "b", "--columns", "--noheadings", "--nosuffix"]
pvdisplay_cmd_device_options = [pvdisplay_cmd, device] + pvdisplay_ops
rc, dev_size, err = module.run_command(pvdisplay_cmd_device_options + ["-o", "dev_size"])
dev_size = int(dev_size.replace(" ", ""))
rc, pv_size, err = module.run_command(pvdisplay_cmd_device_options + ["-o", "pv_size"])
pv_size = int(pv_size.replace(" ", ""))
rc, pe_start, err = module.run_command(pvdisplay_cmd_device_options + ["-o", "pe_start"])
pe_start = int(pe_start.replace(" ", ""))
rc, vg_extent_size, err = module.run_command(pvdisplay_cmd_device_options + ["-o", "vg_extent_size"])
vg_extent_size = int(vg_extent_size.replace(" ", ""))
if (dev_size - (pe_start + pv_size)) > vg_extent_size:
if module.check_mode:
changed = True
else:
rc, dummy, err = module.run_command([pvresize_cmd, device])
if rc != 0:
module.fail_json(msg="Failed executing pvresize command.", rc=rc, err=err)
else:
changed = True
if devs_to_add or devs_to_remove:
if module.check_mode:
changed = True
else:
if devs_to_add:
devs_to_add_string = ' '.join(devs_to_add)
# create PV
pvcreate_cmd = module.get_bin_path('pvcreate', True)
for current_dev in devs_to_add:
rc, dummy, err = module.run_command([pvcreate_cmd] + pvoptions + ['-f', str(current_dev)])
if rc == 0:
changed = True
else:
module.fail_json(msg="Creating physical volume '%s' failed" % current_dev, rc=rc, err=err)
# add PV to our VG
vgextend_cmd = module.get_bin_path('vgextend', True)
rc, dummy, err = module.run_command("%s %s %s" % (vgextend_cmd, vg, devs_to_add_string))
if rc == 0:
changed = True
else:
module.fail_json(msg="Unable to extend %s by %s." % (vg, devs_to_add_string), rc=rc, err=err)
# remove some PV from our VG
if devs_to_remove:
devs_to_remove_string = ' '.join(devs_to_remove)
vgreduce_cmd = module.get_bin_path('vgreduce', True)
rc, dummy, err = module.run_command("%s --force %s %s" % (vgreduce_cmd, vg, devs_to_remove_string))
if rc == 0:
changed = True
else:
module.fail_json(msg="Unable to reduce %s by %s." % (vg, devs_to_remove_string), rc=rc, err=err)
module.exit_json(changed=changed)
if __name__ == '__main__':
main()
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