Create a new volume in a storage pool using libvirt-python API

define_volume.py

#!/usr/bin/env python3

# Define a storage pool using the libvirt API.
# virsh vol-list <poolname> to verify.
# virsh vol-delete <volname> --pool <poolname> to remove.

import libvirt
import sys
import os

pool_name = "test"
vol_name = "test-vol"
vol_size = 2
vol_type = "qcow2"

# Use the type as the file extension.
vol_name = vol_name + "." + vol_type
vol_path = os.path.join("/var/lib/libvirt", pool_name, vol_name)

print("Connecting to API")
conn = None
try:
    conn = libvirt.open("qemu:///system")
except libvirt.libvirtError as e:
    print(repr(e), file=sys.stderr)
    exit(1)

print("Using storage pool", pool_name)
pool = conn.storagePoolLookupByName(pool_name)

print("Creating storage volume", vol_name)
volumeXML = """
<volume>
  <name>{0}</name>
  <allocation>0</allocation>
  <capacity unit="G">{1}</capacity>
  <target>
    <format type="{2}"/>
    <path>{3}</path>
  </target>
</volume>""".format(vol_name, vol_size, vol_type, vol_path)

pool.createXML(volumeXML, 0)