qemu-agent-guest-exec

#!/usr/bin/python3
'''
Execute a command inside the guest.
'''

import base64
import json
import libvirt
import libvirt_qemu
import logging
import sys
import time

domain_name = sys.argv[1]
command_path = sys.argv[2]
command_args = sys.argv[3:]

try:
    connection = libvirt.open(None)
except libvirt.libvirtError:
    logging.exception('Failed to open connection to the hypervisor')
    exit(1)

try:
    domain = connection.lookupByName(domain_name)
except libvirt.libvirtError:
    logging.exception(f'Domain {domain_name} is not running')
    exit(1)

# execute a command inside the guest.
# see https://libvirt.org/html/libvirt-libvirt-qemu.html#virDomainQemuAgentCommand
command = json.dumps({
    'execute': 'guest-exec',
    'arguments': {
        'path': command_path,
        'arg': command_args,
        'capture-output': True,
    }
})
result = json.loads(libvirt_qemu.qemuAgentCommand(domain, command, -2, 0))
command = json.dumps({
    'execute': 'guest-exec-status',
    'arguments': {
        'pid': result['return']['pid'],
    }
})
while True:
    result = json.loads(libvirt_qemu.qemuAgentCommand(domain, command, -2, 0))
    if result['return']['exited']:
        print(base64.b64decode(result['return']['out-data']).decode('utf-8'))
        break
    time.sleep(0.1)