ansible/library/lvol

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2013, 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: Jeroen Hoekx
module: lvol
short_description: Configure LVM logical volumes
description:
- This module creates, removes or resizes logical volumes.
version_added: "1.1"
options:
vg:
description:
- The volume group this logical volume is part of.
required: true
lv:
description:
- The name of the logical volume.
required: true
size:
description:
- The size of the logical volume in megabytes.
state:
choices: [ "present", "absent" ]
default: present
description:
- Control if the logical volume exists.
required: false
examples:
- description: Create a logical volume of 512m.
code: lvol vg=firefly lv=test size=512
- description: Extend the logical volume to 1024m.
code: lvol vg=firefly lv=test size=1024
- description: Reduce the logical volume to 512m
code: lvol vg=firefly lv=test size=512
- description: Remove the logical volume.
code: lvol vg=firefly lv=test state=absent
notes:
- Filesystems on top of the volume are not resized.
'''
def parse_lvs(data):
lvs = []
for line in data.splitlines():
parts = line.strip().split(';')
lvs.append({
'name': parts[0],
'size': int(parts[1].split('.')[0]),
'path': parts[2],
})
return lvs
def main():
module = AnsibleModule(
argument_spec = dict(
vg=dict(required=True),
lv=dict(required=True),
size=dict(),
state=dict(choices=["absent", "present"], default='present'),
),
supports_check_mode=True,
)
vg = module.params['vg']
lv = module.params['lv']
size = module.params['size']
state = module.params['state']
if state=='present' and not size:
module.fail_json(msg="No size given.")
if size:
size = int(size)
rc,current_lvs,err = module.run_command("lvs --noheadings -o lv_name,size,lv_path --units m --separator ';' %s"%(vg))
if rc != 0:
module.fail_json(msg="Volume group %s does not exist."%vg, rc=rc, err=err)
changed = False
lvs = parse_lvs(current_lvs)
for test_lv in lvs:
if test_lv['name'] == lv:
this_lv = test_lv
break
else:
this_lv = None
if this_lv is None:
if state == 'present':
### create LV
if module.check_mode:
changed = True
else:
rc,_,err = module.run_command("lvcreate -n %s -L %sm %s"%(lv, size, vg))
if rc == 0:
changed = True
else:
module.fail_json(msg="Creating logical volume '%s' failed"%(lv), rc=rc, err=err)
else:
if state == 'absent':
### remove LV
if module.check_mode:
module.exit_json(changed=True)
rc,_,err = module.run_command("lvremove --force %s"%(this_lv['path']))
if rc == 0:
module.exit_json(changed=True)
else:
module.fail_json(msg="Failed to remove logical volume %s"%(lv),rc=rc, err=err)
### resize LV
tool = None
if size > this_lv['size']:
tool = 'lvextend'
elif size < this_lv['size']:
tool = 'lvreduce --force'
if tool:
if module.check_mode:
changed = True
else:
rc,_,err = module.run_command("%s -L %sm %s"%(tool, size, this_lv['path']))
if rc == 0:
changed = True
else:
module.fail_json(msg="Unable to resize %s to %sm."%(lv,size),rc=rc,err=err)
module.exit_json(changed=changed)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()