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ansible/system/lvol.py
Yannig bbd53572af New lvol option: shrink. (#2135) 
If shrink is set to false and size is lower than current lv size, dont try to shrink logical volume.
2016-05-13 11:28:41 +02:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2013, Jeroen Hoekx <jeroen.hoekx@dsquare.be>, Alexander Bulimov <lazywolf0@gmail.com>
#
# 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 (@jhoekx)"
- "Alexander Bulimov (@abulimov)"
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, according to lvcreate(8) --size, by
default in megabytes or optionally with one of [bBsSkKmMgGtTpPeE] units; or
according to lvcreate(8) --extents as a percentage of [VG|PVS|FREE];
Float values must begin with a digit.
Resizing using percentage values was not supported prior to 2.1.
state:
choices: [ "present", "absent" ]
default: present
description:
- Control if the logical volume exists. If C(present) the C(size) option
is required.
required: false
force:
version_added: "1.5"
choices: [ "yes", "no" ]
default: "no"
description:
- Shrink or remove operations of volumes requires this switch. Ensures that
that filesystems get never corrupted/destroyed by mistake.
required: false
opts:
version_added: "2.0"
description:
- Free-form options to be passed to the lvcreate command
snapshot:
version_added: "2.1"
description:
- The name of the snapshot volume
required: false
pvs:
version_added: "2.2"
description:
- Comma separated list of physical volumes e.g. /dev/sda,/dev/sdb
required: false
shrink:
version_added: "2.2"
description:
- shrink if current size is higher than size requested
required: false
default: yes
notes:
- Filesystems on top of the volume are not resized.
'''
EXAMPLES = '''
# Create a logical volume of 512m.
- lvol: vg=firefly lv=test size=512
# Create a logical volume of 512m with disks /dev/sda and /dev/sdb
- lvol: vg=firefly lv=test size=512 pvs=/dev/sda,/dev/sdb
# Create cache pool logical volume
- lvol: vg=firefly lv=lvcache size=512m opts='--type cache-pool'
# Create a logical volume of 512g.
- lvol: vg=firefly lv=test size=512g
# Create a logical volume the size of all remaining space in the volume group
- lvol: vg=firefly lv=test size=100%FREE
# Create a logical volume with special options
- lvol: vg=firefly lv=test size=512g opts="-r 16"
# Extend the logical volume to 1024m.
- lvol: vg=firefly lv=test size=1024
# Extend the logical volume to consume all remaining space in the volume group
- lvol: vg=firefly lv=test size=+100%FREE
# Extend the logical volume to take all remaining space of the PVs
- lvol: vg=firefly lv=test size=100%PVS
# Resize the logical volume to % of VG
- lvol: vg-firefly lv=test size=80%VG force=yes
# Reduce the logical volume to 512m
- lvol: vg=firefly lv=test size=512 force=yes
# Set the logical volume to 512m and do not try to shrink if size is lower than current one
- lvol: vg=firefly lv=test size=512 shrink=no
# Remove the logical volume.
- lvol: vg=firefly lv=test state=absent force=yes
# Create a snapshot volume of the test logical volume.
- lvol: vg=firefly lv=test snapshot=snap1 size=100m
'''
import re
decimal_point = re.compile(r"(\d+)")
def mkversion(major, minor, patch):
return (1000 * 1000 * int(major)) + (1000 * int(minor)) + int(patch)
def parse_lvs(data):
lvs = []
for line in data.splitlines():
parts = line.strip().split(';')
lvs.append({
'name': parts[0].replace('[','').replace(']',''),
'size': int(decimal_point.match(parts[1]).group(1))
})
return lvs
def parse_vgs(data):
vgs = []
for line in data.splitlines():
parts = line.strip().split(';')
vgs.append({
'name': parts[0],
'size': int(decimal_point.match(parts[1]).group(1)),
'free': int(decimal_point.match(parts[2]).group(1)),
'ext_size': int(decimal_point.match(parts[3]).group(1))
})
return vgs
def get_lvm_version(module):
ver_cmd = module.get_bin_path("lvm", required=True)
rc, out, err = module.run_command("%s version" % (ver_cmd))
if rc != 0:
return None
m = re.search("LVM version:\s+(\d+)\.(\d+)\.(\d+).*(\d{4}-\d{2}-\d{2})", out)
if not m:
return None
return mkversion(m.group(1), m.group(2), m.group(3))
def main():
module = AnsibleModule(
argument_spec=dict(
vg=dict(required=True),
lv=dict(required=True),
size=dict(type='str'),
opts=dict(type='str'),
state=dict(choices=["absent", "present"], default='present'),
force=dict(type='bool', default='no'),
shrink=dict(type='bool', default='yes'),
snapshot=dict(type='str', default=None),
pvs=dict(type='str')
),
supports_check_mode=True,
)
# Determine if the "--yes" option should be used
version_found = get_lvm_version(module)
if version_found == None:
module.fail_json(msg="Failed to get LVM version number")
version_yesopt = mkversion(2, 2, 99) # First LVM with the "--yes" option
if version_found >= version_yesopt:
yesopt = "--yes"
else:
yesopt = ""
vg = module.params['vg']
lv = module.params['lv']
size = module.params['size']
opts = module.params['opts']
state = module.params['state']
force = module.boolean(module.params['force'])
shrink = module.boolean(module.params['shrink'])
size_opt = 'L'
size_unit = 'm'
snapshot = module.params['snapshot']
pvs = module.params['pvs']
if pvs is None:
pvs = ""
else:
pvs = pvs.replace(",", " ")
if opts is None:
opts = ""
if size:
# LVCREATE(8) -l --extents option with percentage
if '%' in size:
size_parts = size.split('%', 1)
size_percent = int(size_parts[0])
if size_percent > 100:
module.fail_json(msg="Size percentage cannot be larger than 100%")
size_whole = size_parts[1]
if size_whole == 'ORIGIN':
module.fail_json(msg="Snapshot Volumes are not supported")
elif size_whole not in ['VG', 'PVS', 'FREE']:
module.fail_json(msg="Specify extents as a percentage of VG|PVS|FREE")
size_opt = 'l'
size_unit = ''
if not '%' in size:
# LVCREATE(8) -L --size option unit
if size[-1].lower() in 'bskmgtpe':
size_unit = size[-1].lower()
size = size[0:-1]
try:
float(size)
if not size[0].isdigit(): raise ValueError()
except ValueError:
module.fail_json(msg="Bad size specification of '%s'" % size)
# when no unit, megabytes by default
if size_opt == 'l':
unit = 'm'
else:
unit = size_unit
# Get information on volume group requested
vgs_cmd = module.get_bin_path("vgs", required=True)
rc, current_vgs, err = module.run_command(
"%s --noheadings -o vg_name,size,free,vg_extent_size --units %s --separator ';' %s" % (vgs_cmd, unit, vg))
if rc != 0:
if state == 'absent':
module.exit_json(changed=False, stdout="Volume group %s does not exist." % vg, stderr=False)
else:
module.fail_json(msg="Volume group %s does not exist." % vg, rc=rc, err=err)
vgs = parse_vgs(current_vgs)
this_vg = vgs[0]
# Get information on logical volume requested
lvs_cmd = module.get_bin_path("lvs", required=True)
rc, current_lvs, err = module.run_command(
"%s -a --noheadings --nosuffix -o lv_name,size --units %s --separator ';' %s" % (lvs_cmd, unit, vg))
if rc != 0:
if state == 'absent':
module.exit_json(changed=False, stdout="Volume group %s does not exist." % vg, stderr=False)
else:
module.fail_json(msg="Volume group %s does not exist." % vg, rc=rc, err=err)
changed = False
lvs = parse_lvs(current_lvs)
if snapshot is None:
check_lv = lv
else:
check_lv = snapshot
for test_lv in lvs:
if test_lv['name'] == check_lv:
this_lv = test_lv
break
else:
this_lv = None
if state == 'present' and not size:
if this_lv is None:
module.fail_json(msg="No size given.")
else:
module.exit_json(changed=False, vg=vg, lv=this_lv['name'], size=this_lv['size'])
msg = ''
if this_lv is None:
if state == 'present':
### create LV
if module.check_mode:
changed = True
else:
lvcreate_cmd = module.get_bin_path("lvcreate", required=True)
if snapshot is not None:
cmd = "%s %s -%s %s%s -s -n %s %s %s/%s" % (lvcreate_cmd, yesopt, size_opt, size, size_unit, snapshot, opts, vg, lv)
else:
cmd = "%s %s -n %s -%s %s%s %s %s %s" % (lvcreate_cmd, yesopt, lv, size_opt, size, size_unit, opts, vg, pvs)
rc, _, err = module.run_command(cmd)
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)
if not force:
module.fail_json(msg="Sorry, no removal of logical volume %s without force=yes." % (this_lv['name']))
lvremove_cmd = module.get_bin_path("lvremove", required=True)
rc, _, err = module.run_command("%s --force %s/%s" % (lvremove_cmd, vg, this_lv['name']))
if rc == 0:
module.exit_json(changed=True)
else:
module.fail_json(msg="Failed to remove logical volume %s" % (lv), rc=rc, err=err)
elif size_opt == 'l':
### Resize LV based on % value
tool = None
size_free = this_vg['free']
if size_whole == 'VG' or size_whole == 'PVS':
size_requested = size_percent * this_vg['size'] / 100
else: # size_whole == 'FREE':
size_requested = size_percent * this_vg['free'] / 100
if '+' in size:
size_requested += this_lv['size']
if this_lv['size'] < size_requested:
if (size_free > 0) and (('+' not in size) or (size_free >= (size_requested - this_lv['size']))):
tool = module.get_bin_path("lvextend", required=True)
else:
module.fail_json(msg="Logical Volume %s could not be extended. Not enough free space left (%s%s required / %s%s available)" % (this_lv['name'], (size_requested - this_lv['size']), unit, size_free, unit))
elif shrink and this_lv['size'] > size_requested + this_vg['ext_size']: # more than an extent too large
if size_requested == 0:
module.fail_json(msg="Sorry, no shrinking of %s to 0 permitted." % (this_lv['name']))
elif not force:
module.fail_json(msg="Sorry, no shrinking of %s without force=yes" % (this_lv['name']))
else:
tool = module.get_bin_path("lvreduce", required=True)
tool = '%s %s' % (tool, '--force')
if tool:
if module.check_mode:
changed = True
else:
cmd = "%s -%s %s%s %s/%s %s" % (tool, size_opt, size, size_unit, vg, this_lv['name'], pvs)
rc, out, err = module.run_command(cmd)
if "Reached maximum COW size" in out:
module.fail_json(msg="Unable to resize %s to %s%s" % (lv, size, size_unit), rc=rc, err=err, out=out)
elif rc == 0:
changed = True
msg="Volume %s resized to %s%s" % (this_lv['name'], size_requested, unit)
elif "matches existing size" in err:
module.exit_json(changed=False, vg=vg, lv=this_lv['name'], size=this_lv['size'])
else:
module.fail_json(msg="Unable to resize %s to %s%s" % (lv, size, size_unit), rc=rc, err=err)
else:
### resize LV based on absolute values
tool = None
if int(size) > this_lv['size']:
tool = module.get_bin_path("lvextend", required=True)
elif shrink and int(size) < this_lv['size']:
if int(size) == 0:
module.fail_json(msg="Sorry, no shrinking of %s to 0 permitted." % (this_lv['name']))
if not force:
module.fail_json(msg="Sorry, no shrinking of %s without force=yes." % (this_lv['name']))
else:
tool = module.get_bin_path("lvreduce", required=True)
tool = '%s %s' % (tool, '--force')
if tool:
if module.check_mode:
changed = True
else:
cmd = "%s -%s %s%s %s/%s %s" % (tool, size_opt, size, size_unit, vg, this_lv['name'], pvs)
rc, out, err = module.run_command(cmd)
if "Reached maximum COW size" in out:
module.fail_json(msg="Unable to resize %s to %s%s" % (lv, size, size_unit), rc=rc, err=err, out=out)
elif rc == 0:
changed = True
elif "matches existing size" in err:
module.exit_json(changed=False, vg=vg, lv=this_lv['name'], size=this_lv['size'])
else:
module.fail_json(msg="Unable to resize %s to %s%s" % (lv, size, size_unit), rc=rc, err=err)
module.exit_json(changed=changed, msg=msg)
# import module snippets
from ansible.module_utils.basic import *
if __name__ == '__main__':
main()
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