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qemu/scripts/qmp/qemu-ga-client
Cleber Rosa 8f8fd9edba Introduce a Python module structure 
This is a simple move of Python code that wraps common QEMU
functionality, and are used by a number of different tests
and scripts.

By treating that code as a real Python module, we can more easily:
 * reuse code
 * have a proper place for the module's own unittests
 * apply a more consistent style
 * generate documentation

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Caio Carrara <ccarrara@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20190206162901.19082-2-crosa@redhat.com>
Signed-off-by: Cleber Rosa <crosa@redhat.com>
2019-02-22 14:07:01 -05:00

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#!/usr/bin/python
# QEMU Guest Agent Client
#
# Copyright (C) 2012 Ryota Ozaki <ozaki.ryota@gmail.com>
#
# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
#
# Usage:
#
# Start QEMU with:
#
# # qemu [...] -chardev socket,path=/tmp/qga.sock,server,nowait,id=qga0 \
# -device virtio-serial -device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0
#
# Run the script:
#
# $ qemu-ga-client --address=/tmp/qga.sock <command> [args...]
#
# or
#
# $ export QGA_CLIENT_ADDRESS=/tmp/qga.sock
# $ qemu-ga-client <command> [args...]
#
# For example:
#
# $ qemu-ga-client cat /etc/resolv.conf
# # Generated by NetworkManager
# nameserver 10.0.2.3
# $ qemu-ga-client fsfreeze status
# thawed
# $ qemu-ga-client fsfreeze freeze
# 2 filesystems frozen
#
# See also: https://wiki.qemu.org/Features/QAPI/GuestAgent
#
from __future__ import print_function
import os
import sys
import base64
import random
sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
from qemu import qmp
class QemuGuestAgent(qmp.QEMUMonitorProtocol):
def __getattr__(self, name):
def wrapper(**kwds):
return self.command('guest-' + name.replace('_', '-'), **kwds)
return wrapper
class QemuGuestAgentClient:
error = QemuGuestAgent.error
def __init__(self, address):
self.qga = QemuGuestAgent(address)
self.qga.connect(negotiate=False)
def sync(self, timeout=3):
# Avoid being blocked forever
if not self.ping(timeout):
raise EnvironmentError('Agent seems not alive')
uid = random.randint(0, (1 << 32) - 1)
while True:
ret = self.qga.sync(id=uid)
if isinstance(ret, int) and int(ret) == uid:
break
def __file_read_all(self, handle):
eof = False
data = ''
while not eof:
ret = self.qga.file_read(handle=handle, count=1024)
_data = base64.b64decode(ret['buf-b64'])
data += _data
eof = ret['eof']
return data
def read(self, path):
handle = self.qga.file_open(path=path)
try:
data = self.__file_read_all(handle)
finally:
self.qga.file_close(handle=handle)
return data
def info(self):
info = self.qga.info()
msgs = []
msgs.append('version: ' + info['version'])
msgs.append('supported_commands:')
enabled = [c['name'] for c in info['supported_commands'] if c['enabled']]
msgs.append('\tenabled: ' + ', '.join(enabled))
disabled = [c['name'] for c in info['supported_commands'] if not c['enabled']]
msgs.append('\tdisabled: ' + ', '.join(disabled))
return '\n'.join(msgs)
def __gen_ipv4_netmask(self, prefixlen):
mask = int('1' * prefixlen + '0' * (32 - prefixlen), 2)
return '.'.join([str(mask >> 24),
str((mask >> 16) & 0xff),
str((mask >> 8) & 0xff),
str(mask & 0xff)])
def ifconfig(self):
nifs = self.qga.network_get_interfaces()
msgs = []
for nif in nifs:
msgs.append(nif['name'] + ':')
if 'ip-addresses' in nif:
for ipaddr in nif['ip-addresses']:
if ipaddr['ip-address-type'] == 'ipv4':
addr = ipaddr['ip-address']
mask = self.__gen_ipv4_netmask(int(ipaddr['prefix']))
msgs.append("\tinet %s netmask %s" % (addr, mask))
elif ipaddr['ip-address-type'] == 'ipv6':
addr = ipaddr['ip-address']
prefix = ipaddr['prefix']
msgs.append("\tinet6 %s prefixlen %s" % (addr, prefix))
if nif['hardware-address'] != '00:00:00:00:00:00':
msgs.append("\tether " + nif['hardware-address'])
return '\n'.join(msgs)
def ping(self, timeout):
self.qga.settimeout(timeout)
try:
self.qga.ping()
except self.qga.timeout:
return False
return True
def fsfreeze(self, cmd):
if cmd not in ['status', 'freeze', 'thaw']:
raise Exception('Invalid command: ' + cmd)
return getattr(self.qga, 'fsfreeze' + '_' + cmd)()
def fstrim(self, minimum=0):
return getattr(self.qga, 'fstrim')(minimum=minimum)
def suspend(self, mode):
if mode not in ['disk', 'ram', 'hybrid']:
raise Exception('Invalid mode: ' + mode)
try:
getattr(self.qga, 'suspend' + '_' + mode)()
# On error exception will raise
except self.qga.timeout:
# On success command will timed out
return
def shutdown(self, mode='powerdown'):
if mode not in ['powerdown', 'halt', 'reboot']:
raise Exception('Invalid mode: ' + mode)
try:
self.qga.shutdown(mode=mode)
except self.qga.timeout:
return
def _cmd_cat(client, args):
if len(args) != 1:
print('Invalid argument')
print('Usage: cat <file>')
sys.exit(1)
print(client.read(args[0]))
def _cmd_fsfreeze(client, args):
usage = 'Usage: fsfreeze status|freeze|thaw'
if len(args) != 1:
print('Invalid argument')
print(usage)
sys.exit(1)
if args[0] not in ['status', 'freeze', 'thaw']:
print('Invalid command: ' + args[0])
print(usage)
sys.exit(1)
cmd = args[0]
ret = client.fsfreeze(cmd)
if cmd == 'status':
print(ret)
elif cmd == 'freeze':
print("%d filesystems frozen" % ret)
else:
print("%d filesystems thawed" % ret)
def _cmd_fstrim(client, args):
if len(args) == 0:
minimum = 0
else:
minimum = int(args[0])
print(client.fstrim(minimum))
def _cmd_ifconfig(client, args):
print(client.ifconfig())
def _cmd_info(client, args):
print(client.info())
def _cmd_ping(client, args):
if len(args) == 0:
timeout = 3
else:
timeout = float(args[0])
alive = client.ping(timeout)
if not alive:
print("Not responded in %s sec" % args[0])
sys.exit(1)
def _cmd_suspend(client, args):
usage = 'Usage: suspend disk|ram|hybrid'
if len(args) != 1:
print('Less argument')
print(usage)
sys.exit(1)
if args[0] not in ['disk', 'ram', 'hybrid']:
print('Invalid command: ' + args[0])
print(usage)
sys.exit(1)
client.suspend(args[0])
def _cmd_shutdown(client, args):
client.shutdown()
_cmd_powerdown = _cmd_shutdown
def _cmd_halt(client, args):
client.shutdown('halt')
def _cmd_reboot(client, args):
client.shutdown('reboot')
commands = [m.replace('_cmd_', '') for m in dir() if '_cmd_' in m]
def main(address, cmd, args):
if not os.path.exists(address):
print('%s not found' % address)
sys.exit(1)
if cmd not in commands:
print('Invalid command: ' + cmd)
print('Available commands: ' + ', '.join(commands))
sys.exit(1)
try:
client = QemuGuestAgentClient(address)
except QemuGuestAgent.error as e:
import errno
print(e)
if e.errno == errno.ECONNREFUSED:
print('Hint: qemu is not running?')
sys.exit(1)
if cmd == 'fsfreeze' and args[0] == 'freeze':
client.sync(60)
elif cmd != 'ping':
client.sync()
globals()['_cmd_' + cmd](client, args)
if __name__ == '__main__':
import sys
import os
import optparse
address = os.environ['QGA_CLIENT_ADDRESS'] if 'QGA_CLIENT_ADDRESS' in os.environ else None
usage = "%prog [--address=<unix_path>|<ipv4_address>] <command> [args...]\n"
usage += '<command>: ' + ', '.join(commands)
parser = optparse.OptionParser(usage=usage)
parser.add_option('--address', action='store', type='string',
default=address, help='Specify a ip:port pair or a unix socket path')
options, args = parser.parse_args()
address = options.address
if address is None:
parser.error('address is not specified')
sys.exit(1)
if len(args) == 0:
parser.error('Less argument')
sys.exit(1)
main(address, args[0], args[1:])
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