Add lvol module to manage logical volumes.
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Jeroen Hoekx
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library/lvol
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library/lvol
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# (c) 2013, Jeroen Hoekx <jeroen.hoekx@dsquare.be>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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DOCUMENTATION = '''
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---
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author: Jeroen Hoekx
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module: lvol
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short_description: Configure LVM logical volumes
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description:
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- This module creates, removes or resizes logical volumes.
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version_added: "1.1"
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options:
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vg:
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description:
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- The volume group this logical volume is part of.
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required: true
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lv:
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description:
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- The name of the logical volume.
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required: true
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size:
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description:
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- The size of the logical volume in megabytes.
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state:
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choices: [ "present", "absent" ]
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default: present
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description:
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- Control if the logical volume exists.
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required: false
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examples:
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- description: Create a logical volume of 512m.
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code: lvol vg=firefly lv=test size=512
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- description: Extend the logical volume to 1024m.
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code: lvol vg=firefly lv=test size=1024
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- description: Reduce the logical volume to 512m
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code: lvol vg=firefly lv=test size=512
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- description: Remove the logical volume.
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code: lvol vg=firefly lv=test state=absent
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notes:
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- Filesystems on top of the volume are not resized.
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'''
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def parse_lvs(data):
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lvs = []
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for line in data.splitlines():
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parts = line.strip().split(';')
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lvs.append({
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'name': parts[0],
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'size': int(parts[1].split('.')[0]),
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'path': parts[2],
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})
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return lvs
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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vg=dict(required=True),
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lv=dict(required=True),
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size=dict(),
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state=dict(choices=["absent", "present"], default='present'),
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),
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supports_check_mode=True,
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)
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vg = module.params['vg']
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lv = module.params['lv']
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size = module.params['size']
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state = module.params['state']
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if state=='present' and not size:
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module.fail_json(msg="No size given.")
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if size:
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size = int(size)
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rc,current_lvs,err = module.run_command("lvs --noheadings -o lv_name,size,lv_path --units m --separator ';' %s"%(vg))
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if rc != 0:
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module.fail_json(msg="Volume group %s does not exist."%vg, rc=rc, err=err)
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changed = False
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lvs = parse_lvs(current_lvs)
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for test_lv in lvs:
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if test_lv['name'] == lv:
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this_lv = test_lv
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break
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else:
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this_lv = None
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if this_lv is None:
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if state == 'present':
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### create LV
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if module.check_mode:
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changed = True
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else:
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rc,_,err = module.run_command("lvcreate -n %s -L %sm %s"%(lv, size, vg))
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if rc == 0:
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changed = True
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else:
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module.fail_json(msg="Creating logical volume '%s' failed"%(lv), rc=rc, err=err)
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else:
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if state == 'absent':
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### remove LV
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if module.check_mode:
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module.exit_json(changed=True)
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rc,_,err = module.run_command("lvremove --force %s"%(this_lv['path']))
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if rc == 0:
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module.exit_json(changed=True)
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else:
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module.fail_json(msg="Failed to remove logical volume %s"%(lv),rc=rc, err=err)
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### resize LV
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tool = None
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if size > this_lv['size']:
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tool = 'lvextend'
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elif size < this_lv['size']:
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tool = 'lvreduce --force'
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if tool:
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if module.check_mode:
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changed = True
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else:
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rc,_,err = module.run_command("%s -L %sm %s"%(tool, size, this_lv['path']))
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if rc == 0:
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changed = True
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else:
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module.fail_json(msg="Unable to resize %s to %sm."%(lv,size),rc=rc,err=err)
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module.exit_json(changed=changed)
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# this is magic, see lib/ansible/module_common.py
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#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
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main()
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