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new module: AIX Volume Group creating, resizing, removing (#30381)

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* new module: AIX Volume Group creating, resizing, removing

It is a module to manage Volume Groups to AIX Logical Volume
Manager. With this module is able to create, reisize and
remove a Volume Group.

* fixed suggestion for standards and PEP8

fixed suggestion on PR according with standards and PEP8

* Removed blank space in the end of line.

Removed blank space in the end of line.

* Improved validations, functions, pep8

- fixed pep8 and non-written conventions;
- fixed RETURN doc indentation for msg;
- fixed and improved the physical volume verification;
- pp_size, when not specified, is followed from AIX side;
- included volume group verification in the top;
- included state varyon and varyoff to be easy in playbooks;
- removed check_mode

* Implemented back module.check_module, pep8, return

Implemented back the module.check_module to permit be used.
Some corrections regarding module.exit_json() and
module.fail_json().
Some pep8 and non-written conventions

* removed exit_json() from functions and pep8

- ordered option parameters and pep8 compliance
- removed exit_json() from functions and moved to main()

* pep8, two spaces before function

pep8, two spaces before function

* changed single/double quotes

changed single/double quotes to non-written convention.

* removed command options parameters as global vars.

Commands options parameters was moved as global variables
to inside create_vg().

* include state to return.

included the state to return.

* no-underscore-variable applied to the code

no-underscore-variable was applied to the code

* Fixed version and doc

Fixed version and documentation sanity

* Fixed documentation for E325, E326

Fixed documentation for E325, E326 to force option

* Fixed E319 for return doc.

* Various improvements and cosmetic changes

* Fix whitespace issue
This commit is contained in:
Kairo Araujo 2019-02-04 03:30:10 +01:00 committed by Dag Wieers
parent ebc9e4caf7
commit de67b8e5ee
1 changed files with 369 additions and 0 deletions
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369
lib/ansible/modules/system/aix_lvg.py Normal file
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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright: (c) 2017, Kairo Araujo <kairo@kairo.eti.br>
# 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
ANSIBLE_METADATA = {
'metadata_version': '1.1',
'status': ['preview'],
'supported_by': 'community'
}
DOCUMENTATION = r'''
---
author:
- Kairo Araujo (@kairoaraujo)
module: aix_lvg
short_description: Manage LVM volume groups on AIX
description:
- This module creates, removes or resize volume groups on AIX LVM.
version_added: '2.8'
options:
force:
description:
- Force volume group creation.
type: bool
default: no
pp_size:
description:
- The size of the physical partition in megabytes.
type: int
pvs:
description:
- List of comma-separated devices to use as physical devices in this volume group.
- Required when creating or extending (C(present) state) the volume group.
- If not informed reducing (C(absent) state) the volume group will be removed.
type: list
state:
description:
- Control if the volume group exists and volume group AIX state varyonvg C(varyon) or varyoffvg C(varyoff).
type: str
choices: [ absent, present, varyoff, varyon ]
default: present
vg:
description:
- The name of the volume group.
type: str
required: true
vg_type:
description:
- The type of the volume group.
type: str
choices: [ big, normal, scalable ]
default: normal
notes:
- AIX will permit remove VG only if all LV/Filesystems are not busy.
- Module does not modify PP size for already present volume group.
'''
EXAMPLES = r'''
- name: Create a volume group datavg
aix_lvg:
vg: datavg
pp_size: 128
vg_type: scalable
state: present
- name: Removing a volume group datavg
aix_lvg:
vg: datavg
state: absent
- name: Extending rootvg
aix_lvg:
vg: rootvg
pvs: hdisk1
state: present
- name: Reducing rootvg
aix_lvg:
vg: rootvg
pvs: hdisk1
state: absent
'''
RETURN = r''' # '''
from ansible.module_utils.basic import AnsibleModule
def _validate_pv(module, vg, pvs):
"""
Function to validate if the physical volume (PV) is not already in use by
another volume group or Oracle ASM.
:param module: Ansible module argument spec.
:param vg: Volume group name.
:param pvs: Physical volume list.
:return: [bool, message] or module.fail_json for errors.
"""
lspv_cmd = module.get_bin_path('lspv', True)
rc, current_lspv, stderr = module.run_command("%s" % lspv_cmd)
if rc != 0:
module.fail_json(msg="Failed executing 'lspv' command.", rc=rc, stdout=current_lspv, stderr=stderr)
for pv in pvs:
# Get pv list.
lspv_list = {}
for line in current_lspv.splitlines():
pv_data = line.split()
lspv_list[pv_data[0]] = pv_data[2]
# Check if pv exists and is free.
if pv not in lspv_list.keys():
module.fail_json(msg="Physical volume '%s' doesn't exist." % pv)
if lspv_list[pv] == 'None':
# Disk None, looks free.
# Check if PV is not already in use by Oracle ASM.
lquerypv_cmd = module.get_bin_path('lquerypv', True)
rc, current_lquerypv, stderr = module.run_command("%s -h /dev/%s 20 10" % (lquerypv_cmd, pv))
if rc != 0:
module.fail_json(msg="Failed executing lquerypv command.", rc=rc, stdout=current_lquerypv, stderr=stderr)
if 'ORCLDISK' in current_lquerypv:
module.fail_json("Physical volume '%s' is already used by Oracle ASM." % pv)
msg = "Physical volume '%s' is ok to be used." % pv
return True, msg
# Check if PV is already in use for the same vg.
elif vg != lspv_list[pv]:
module.fail_json(msg="Physical volume '%s' is in use by another volume group '%s'." % (pv, lspv_list[pv]))
msg = "Physical volume '%s' is already used by volume group '%s'." % (pv, lspv_list[pv])
return False, msg
def _validate_vg(module, vg):
"""
Check the current state of volume group.
:param module: Ansible module argument spec.
:param vg: Volume Group name.
:return: True (VG in varyon state) or False (VG in varyoff state) or
None (VG does not exist), message.
"""
lsvg_cmd = module.get_bin_path('lsvg', True)
rc, current_active_vgs, err = module.run_command("%s -o" % lsvg_cmd)
if rc != 0:
module.fail_json(msg="Failed executing '%s' command." % lsvg_cmd)
rc, current_all_vgs, err = module.run_command("%s" % lsvg_cmd)
if rc != 0:
module.fail_json(msg="Failed executing '%s' command." % lsvg_cmd)
if vg in current_all_vgs and vg not in current_active_vgs:
msg = "Volume group '%s' is in varyoff state." % vg
return False, msg
if vg in current_active_vgs:
msg = "Volume group '%s' is in varyon state." % vg
return True, msg
msg = "Volume group '%s' does not exist." % vg
return None, msg
def create_extend_vg(module, vg, pvs, pp_size, vg_type, force, vg_validation):
""" Creates or extend a volume group. """
# Command option parameters.
force_opt = {
True: '-f',
False: ''
}
vg_opt = {
'normal': '',
'big': '-B',
'scalable': '-S',
}
# Validate if PV are not already in use.
pv_state, msg = _validate_pv(module, vg, pvs)
if not pv_state:
changed = False
return changed, msg
vg_state, msg = vg_validation
if vg_state is False:
changed = False
return changed, msg
elif vg_state is True:
# Volume group extension.
changed = True
msg = ""
if not module.check_mode:
extendvg_cmd = module.get_bin_path('extendvg', True)
rc, output, err = module.run_command("%s %s %s" % (extendvg_cmd, vg, ' '.join(pvs)))
if rc != 0:
changed = False
msg = "Extending volume group '%s' has failed." % vg
return changed, msg
msg = "Volume group '%s' extended." % vg
return changed, msg
elif vg_state is None:
# Volume group creation.
changed = True
msg = ''
if not module.check_mode:
mkvg_cmd = module.get_bin_path('mkvg', True)
rc, output, err = module.run_command("%s %s %s %s -y %s %s" % (mkvg_cmd, vg_opt[vg_type], pp_size, force_opt[force], vg, ' '.join(pvs)))
if rc != 0:
changed = False
msg = "Creating volume group '%s' failed." % vg
return changed, msg
msg = "Volume group '%s' created." % vg
return changed, msg
def reduce_vg(module, vg, pvs, vg_validation):
vg_state, msg = vg_validation
if vg_state is False:
changed = False
return changed, msg
elif vg_state is None:
changed = False
return changed, msg
# Define pvs_to_remove (list of physical volumes to be removed).
if pvs is None:
# Remove VG if pvs are note informed.
# Remark: AIX will permit remove only if the VG has not LVs.
lsvg_cmd = module.get_bin_path('lsvg', True)
rc, current_pvs, err = module.run_command("%s -p %s" % (lsvg_cmd, vg))
if rc != 0:
module.fail_json(msg="Failing to execute '%s' command." % lsvg_cmd)
pvs_to_remove = []
for line in current_pvs.splitlines()[2:]:
pvs_to_remove.append(line.split()[0])
reduce_msg = "Volume group '%s' removed." % vg
else:
pvs_to_remove = pvs
reduce_msg = ("Physical volume(s) '%s' removed from Volume group '%s'." % (' '.join(pvs_to_remove), vg))
# Reduce volume group.
if len(pvs_to_remove) <= 0:
changed = False
msg = "No physical volumes to remove."
return changed, msg
changed = True
msg = ''
if not module.check_mode:
reducevg_cmd = module.get_bin_path('reducevg', True)
rc, stdout, stderr = module.run_command("%s -df %s %s" % (reducevg_cmd, vg, ' '.join(pvs_to_remove)))
if rc != 0:
module.fail_json(msg="Unable to remove '%s'." % vg, rc=rc, stdout=stdout, stderr=stderr)
msg = reduce_msg
return changed, msg
def state_vg(module, vg, state, vg_validation):
vg_state, msg = vg_validation
if vg_state is None:
module.fail_json(msg=msg)
if state == 'varyon':
if vg_state is True:
changed = False
return changed, msg
changed = True
msg = ''
if not module.check_mode:
varyonvg_cmd = module.get_bin_path('varyonvg', True)
rc, varyonvg_out, err = module.run_command("%s %s" % (varyonvg_cmd, vg))
if rc != 0:
module.fail_json(msg="Command 'varyonvg' failed.", rc=rc, err=err)
msg = "Varyon volume group %s completed." % vg
return changed, msg
elif state == 'varyoff':
if vg_state is False:
changed = False
return changed, msg
changed = True
msg = ''
if not module.check_mode:
varyonvg_cmd = module.get_bin_path('varyoffvg', True)
rc, varyonvg_out, stderr = module.run_command("%s %s" % (varyonvg_cmd, vg))
if rc != 0:
module.fail_json(msg="Command 'varyoffvg' failed.", rc=rc, stdout=varyonvg_out, stderr=stderr)
msg = "Varyoff volume group %s completed." % vg
return changed, msg
def main():
module = AnsibleModule(
argument_spec=dict(
force=dict(type='bool', default=False),
pp_size=dict(type='int'),
pvs=dict(type='list'),
state=dict(type='str', default='present', choices=['absent', 'present', 'varyoff', 'varyon']),
vg=dict(type='str', required=True),
vg_type=dict(type='str', default='normal', choices=['big', 'normal', 'scalable'])
),
supports_check_mode=True,
)
force = module.params['force']
pp_size = module.params['pp_size']
pvs = module.params['pvs']
state = module.params['state']
vg = module.params['vg']
vg_type = module.params['vg_type']
if pp_size is None:
pp_size = ''
else:
pp_size = "-s %s" % pp_size
vg_validation = _validate_vg(module, vg)
if state == 'present':
if not pvs:
changed = False
msg = "pvs is required to state 'present'."
module.fail_json(msg=msg)
else:
changed, msg = create_extend_vg(module, vg, pvs, pp_size, vg_type, force, vg_validation)
elif state == 'absent':
changed, msg = reduce_vg(module, vg, pvs, vg_validation)
elif state == 'varyon' or state == 'varyoff':
changed, msg = state_vg(module, vg, state, vg_validation)
else:
changed = False
msg = "Unexpected state"
module.exit_json(changed=changed, msg=msg, state=state)
if __name__ == '__main__':
main()