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community.general/library/lvg

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2013, Alexander Bulimov <lazywolf0@gmail.com>
# based on lvol module by Jeroen Hoekx <jeroen.hoekx@dsquare.be>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
DOCUMENTATION = '''
---
author: Alexander Bulimov
module: lvg
short_description: Configure LVM volume groups
description:
- This module creates, removes or resizes volume groups.
version_added: "1.1"
options:
vg:
description:
- The name of the volume group.
required: true
dev:
description:
- List of comma-separated devices to use in this volume group.
required: true
pesize:
description:
- The size of the physical extent in megabytes.
default: 4
required: false
state:
choices: [ "present", "absent" ]
default: present
description:
- Control if the volume group exists.
required: false
force:
choices: [ "yes", "no" ]
default: "no"
description:
- If yes, allows to remove volume group with logical volumes.
required: false
examples:
- description: Create a volume group on top of /dev/sda1 with physical extent size = 32MB.
code: lvg vg=vg.services dev=/dev/sda1 pesize=32
- description: Create a volume group on top of /dev/sdb1 and /dev/sdc5.
code: lvg vg=vg.services dev=/dev/sdb1,/dev/sdc5
- description: Remove a volume group with name vg.services.
code: lvg vg=vg.services state=absent
notes:
- module does not modify PE size for already present volume group
'''
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 parse_pvs(data):
pvs = []
for line in data.splitlines():
parts = line.strip().split(';')
pvs.append({
'name': parts[0],
'vg_name': parts[1],
})
return pvs
def main():
module = AnsibleModule(
argument_spec = dict(
vg=dict(required=True),
dev=dict(),
pesize=dict(),
state=dict(choices=["absent", "present"], default='present'),
force=dict(type='bool', default='no'),
),
supports_check_mode=True,
)
vg = module.params['vg']
state = module.params['state']
force = module.boolean(module.params['force'])
if module.params['pesize']:
pesize = int(module.params['pesize'])
else:
pesize = 4
if module.params['dev']:
dev = module.params['dev'].replace(',',' ')
dev_list = module.params['dev'].split(',')
elif state == 'present':
module.fail_json(msg="No dev given.")
if state=='present':
### check given devices
for test_dev in dev_list:
if not os.path.exists(test_dev):
module.fail_json(msg="No dev %s found."%test_dev)
### get pv list
rc,current_pvs,err = module.run_command("pvs --noheadings -o pv_name,vg_name --separator ';'")
if rc != 0:
module.fail_json(msg="Failed executing pvs command.",rc=rc, err=err)
### check pv for devices
pvs = parse_pvs(current_pvs)
used_pvs = filter(lambda pv: pv['name'] in dev_list and pv['vg_name'] and pv['vg_name'] != vg, pvs)
if used_pvs:
module.fail_json(msg="dev %s is already in %s volume group."%(used_pvs[0]['name'],used_pvs[0]['vg_name']))
rc,current_vgs,err = module.run_command("vgs --noheadings -o vg_name,pv_count,lv_count --separator ';'")
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
for current_dev in dev_list:
rc,_,err = module.run_command("pvcreate %s"%current_dev)
if rc == 0:
changed = True
else:
module.fail_json(msg="Creating physical volume '%s' failed"%current_dev, rc=rc, err=err)
rc,_,err = module.run_command("vgcreate -s %s %s %s"%(pesize, vg, dev))
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
rc,_,err = module.run_command("vgremove --force %s"%(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
action = None
current_devs = map(lambda x: x['name'], filter(lambda pv: pv['vg_name'] == vg, pvs))
devs_to_remove = list(set(current_devs) - set(dev_list))
devs_to_add = list(set(dev_list) - set(current_devs))
if devs_to_remove and devs_to_add:
devs_string = ' '.join([`dev` for dev in devs_to_add])
devs_to_remove_string = ' '.join([`dev` for dev in devs_to_remove])
action = 'modify'
elif devs_to_remove:
devs_string = ' '.join([`dev` for dev in devs_to_remove])
action = 'reduce'
elif devs_to_add:
devs_string = ' '.join([`dev` for dev in devs_to_add])
action = 'extend'
if action:
if module.check_mode:
changed = True
else:
if action == 'extend' or action == 'modify':
tool = 'vgextend'
### create PV
for current_dev in devs_to_add:
rc,_,err = module.run_command("pvcreate %s"%current_dev)
if rc == 0:
changed = True
else:
module.fail_json(msg="Creating physical volume '%s' failed"%current_dev, rc=rc, err=err)
else:
tool = 'vgreduce --force'
### first we add or remove PV
rc,_,err = module.run_command("%s %s %s"%(tool, vg, devs_string))
if rc == 0:
changed = True
else:
module.fail_json(msg="Unable to %s %s by %s."%(action, vg, devs_string),rc=rc,err=err)
### then if we need - remove some PV
if action == 'modify':
tool = 'vgreduce --force'
rc,_,err = module.run_command("%s %s %s"%(tool, 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)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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