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#!/usr/bin/python3
# Check if all libvirt domains are prepared for TRIM/fstrim
# (for use on qcow2 images or thin provisioned volumes)
from __future__ import division, print_function
from distutils.version import LooseVersion
from lxml import objectify
import libvirt
import re
import sys
conn = libvirt.openReadOnly('qemu:///system')
if not conn:
print('Failed to open connection to the hypervisor!')
sys.exit(1)
if not hasattr(conn, "listAllDomains"):
print('connection does not have listAllDomains(), is python-libvirt too old?')
sys.exit(1)
for domain in conn.listAllDomains():
print('== {}'.format(domain.name()))
xml = domain.XMLDesc()
tree = objectify.fromstring(xml)
# machine type version should be >= 2.1 if i440fx
machine = tree.os.type.get('machine')
matches = re.match('^pc-(?:i440fx-)?([0-9.]+)', machine)
if matches:
i440_version = matches.group(1)
if LooseVersion(i440_version) < LooseVersion('2.1'):
print('machine type (version) should be at least pc-i440fx-2.1')
# Might want to check "qemu-system-x86_64 -M help" for supported
# machines.
# no disks, no need to check
if not hasattr(tree.devices, 'disk'):
print('(has no disks)')
continue
# every disk should be scsi + discard=unmap
for disk in tree.devices.disk:
if disk.get('device') != 'disk':
continue
disk_desc = disk.target.get('dev')
if disk.target.get('bus') != 'scsi':
print('{} target should be scsi'.format(disk_desc))
if disk.driver.get('discard') != 'unmap':
print('{} driver should have discard=unmap'.format(disk_desc))
# every scsi controller should be model='virtio-scsi'
for controller in tree.devices.controller:
if controller.get('type') != 'scsi':
continue
if controller.get('model') != 'virtio-scsi':
print('scsi controller should be a virtio model')