QMP/qemu-ga-client

   1 #!/usr/bin/python
   2
   3 # QEMU Guest Agent Client
   4 #
   5 # Copyright (C) 2012 Ryota Ozaki <ozaki.ryota@gmail.com>
   6 #
   7 # This work is licensed under the terms of the GNU GPL, version 2.  See
   8 # the COPYING file in the top-level directory.
   9 #
  10 # Usage:
  11 #
  12 # Start QEMU with:
  13 #
  14 # # qemu [...] -chardev socket,path=/tmp/qga.sock,server,nowait,id=qga0 \
  15 #   -device virtio-serial -device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0
  16 #
  17 # Run the script:
  18 #
  19 # $ qemu-ga-client --address=/tmp/qga.sock <command> [args...]
  20 #
  21 # or
  22 #
  23 # $ export QGA_CLIENT_ADDRESS=/tmp/qga.sock
  24 # $ qemu-ga-client <command> [args...]
  25 #
  26 # For example:
  27 #
  28 # $ qemu-ga-client cat /etc/resolv.conf
  29 # # Generated by NetworkManager
  30 # nameserver 10.0.2.3
  31 # $ qemu-ga-client fsfreeze status
  32 # thawed
  33 # $ qemu-ga-client fsfreeze freeze
  34 # 2 filesystems frozen
  35 #
  36 # See also: http://wiki.qemu.org/Features/QAPI/GuestAgent
  37 #
  38
  39 import base64
  40 import random
  41
  42 import qmp
  43
  44
  45 class QemuGuestAgent(qmp.QEMUMonitorProtocol):
  46     def __getattr__(self, name):
  47         def wrapper(**kwds):
  48             return self.command('guest-' + name.replace('_', '-'), **kwds)
  49         return wrapper
  50
  51
  52 class QemuGuestAgentClient:
  53     error = QemuGuestAgent.error
  54
  55     def __init__(self, address):
  56         self.qga = QemuGuestAgent(address)
  57         self.qga.connect(negotiate=False)
  58
  59     def sync(self, timeout=3):
  60         # Avoid being blocked forever
  61         if not self.ping(timeout):
  62             raise EnvironmentError('Agent seems not alive')
  63         uid = random.randint(0, (1 << 32) - 1)
  64         while True:
  65             ret = self.qga.sync(id=uid)
  66             if isinstance(ret, int) and int(ret) == uid:
  67                 break
  68
  69     def __file_read_all(self, handle):
  70         eof = False
  71         data = ''
  72         while not eof:
  73             ret = self.qga.file_read(handle=handle, count=1024)
  74             _data = base64.b64decode(ret['buf-b64'])
  75             data += _data
  76             eof = ret['eof']
  77         return data
  78
  79     def read(self, path):
  80         handle = self.qga.file_open(path=path)
  81         try:
  82             data = self.__file_read_all(handle)
  83         finally:
  84             self.qga.file_close(handle=handle)
  85         return data
  86
  87     def info(self):
  88         info = self.qga.info()
  89
  90         msgs = []
  91         msgs.append('version: ' + info['version'])
  92         msgs.append('supported_commands:')
  93         enabled = [c['name'] for c in info['supported_commands'] if c['enabled']]
  94         msgs.append('\tenabled: ' + ', '.join(enabled))
  95         disabled = [c['name'] for c in info['supported_commands'] if not c['enabled']]
  96         msgs.append('\tdisabled: ' + ', '.join(disabled))
  97
  98         return '\n'.join(msgs)
  99
 100     def __gen_ipv4_netmask(self, prefixlen):
 101         mask = int('1' * prefixlen + '0' * (32 - prefixlen), 2)
 102         return '.'.join([str(mask >> 24),
 103                          str((mask >> 16) & 0xff),
 104                          str((mask >> 8) & 0xff),
 105                          str(mask & 0xff)])
 106
 107     def ifconfig(self):
 108         nifs = self.qga.network_get_interfaces()
 109
 110         msgs = []
 111         for nif in nifs:
 112             msgs.append(nif['name'] + ':')
 113             if 'ip-addresses' in nif:
 114                 for ipaddr in nif['ip-addresses']:
 115                     if ipaddr['ip-address-type'] == 'ipv4':
 116                         addr = ipaddr['ip-address']
 117                         mask = self.__gen_ipv4_netmask(int(ipaddr['prefix']))
 118                         msgs.append("\tinet %s  netmask %s" % (addr, mask))
 119                     elif ipaddr['ip-address-type'] == 'ipv6':
 120                         addr = ipaddr['ip-address']
 121                         prefix = ipaddr['prefix']
 122                         msgs.append("\tinet6 %s  prefixlen %s" % (addr, prefix))
 123             if nif['hardware-address'] != '00:00:00:00:00:00':
 124                 msgs.append("\tether " + nif['hardware-address'])
 125
 126         return '\n'.join(msgs)
 127
 128     def ping(self, timeout):
 129         self.qga.settimeout(timeout)
 130         try:
 131             self.qga.ping()
 132         except self.qga.timeout:
 133             return False
 134         return True
 135
 136     def fsfreeze(self, cmd):
 137         if cmd not in ['status', 'freeze', 'thaw']:
 138             raise StandardError('Invalid command: ' + cmd)
 139
 140         return getattr(self.qga, 'fsfreeze' + '_' + cmd)()
 141
 142     def fstrim(self, minimum=0):
 143         return getattr(self.qga, 'fstrim')(minimum=minimum)
 144
 145     def suspend(self, mode):
 146         if mode not in ['disk', 'ram', 'hybrid']:
 147             raise StandardError('Invalid mode: ' + mode)
 148
 149         try:
 150             getattr(self.qga, 'suspend' + '_' + mode)()
 151             # On error exception will raise
 152         except self.qga.timeout:
 153             # On success command will timed out
 154             return
 155
 156     def shutdown(self, mode='powerdown'):
 157         if mode not in ['powerdown', 'halt', 'reboot']:
 158             raise StandardError('Invalid mode: ' + mode)
 159
 160         try:
 161             self.qga.shutdown(mode=mode)
 162         except self.qga.timeout:
 163             return
 164
 165
 166 def _cmd_cat(client, args):
 167     if len(args) != 1:
 168         print('Invalid argument')
 169         print('Usage: cat <file>')
 170         sys.exit(1)
 171     print(client.read(args[0]))
 172
 173
 174 def _cmd_fsfreeze(client, args):
 175     usage = 'Usage: fsfreeze status|freeze|thaw'
 176     if len(args) != 1:
 177         print('Invalid argument')
 178         print(usage)
 179         sys.exit(1)
 180     if args[0] not in ['status', 'freeze', 'thaw']:
 181         print('Invalid command: ' + args[0])
 182         print(usage)
 183         sys.exit(1)
 184     cmd = args[0]
 185     ret = client.fsfreeze(cmd)
 186     if cmd == 'status':
 187         print(ret)
 188     elif cmd == 'freeze':
 189         print("%d filesystems frozen" % ret)
 190     else:
 191         print("%d filesystems thawed" % ret)
 192
 193
 194 def _cmd_fstrim(client, args):
 195     if len(args) == 0:
 196         minimum = 0
 197     else:
 198         minimum = int(args[0])
 199     print(client.fstrim(minimum))
 200
 201
 202 def _cmd_ifconfig(client, args):
 203     print(client.ifconfig())
 204
 205
 206 def _cmd_info(client, args):
 207     print(client.info())
 208
 209
 210 def _cmd_ping(client, args):
 211     if len(args) == 0:
 212         timeout = 3
 213     else:
 214         timeout = float(args[0])
 215     alive = client.ping(timeout)
 216     if not alive:
 217         print("Not responded in %s sec" % args[0])
 218         sys.exit(1)
 219
 220
 221 def _cmd_suspend(client, args):
 222     usage = 'Usage: suspend disk|ram|hybrid'
 223     if len(args) != 1:
 224         print('Less argument')
 225         print(usage)
 226         sys.exit(1)
 227     if args[0] not in ['disk', 'ram', 'hybrid']:
 228         print('Invalid command: ' + args[0])
 229         print(usage)
 230         sys.exit(1)
 231     client.suspend(args[0])
 232
 233
 234 def _cmd_shutdown(client, args):
 235     client.shutdown()
 236 _cmd_powerdown = _cmd_shutdown
 237
 238
 239 def _cmd_halt(client, args):
 240     client.shutdown('halt')
 241
 242
 243 def _cmd_reboot(client, args):
 244     client.shutdown('reboot')
 245
 246
 247 commands = [m.replace('_cmd_', '') for m in dir() if '_cmd_' in m]
 248
 249
 250 def main(address, cmd, args):
 251     if not os.path.exists(address):
 252         print('%s not found' % address)
 253         sys.exit(1)
 254
 255     if cmd not in commands:
 256         print('Invalid command: ' + cmd)
 257         print('Available commands: ' + ', '.join(commands))
 258         sys.exit(1)
 259
 260     try:
 261         client = QemuGuestAgentClient(address)
 262     except QemuGuestAgent.error, e:
 263         import errno
 264
 265         print(e)
 266         if e.errno == errno.ECONNREFUSED:
 267             print('Hint: qemu is not running?')
 268         sys.exit(1)
 269
 270     if cmd == 'fsfreeze' and args[0] == 'freeze':
 271         client.sync(60)
 272     elif cmd != 'ping':
 273         client.sync()
 274
 275     globals()['_cmd_' + cmd](client, args)
 276
 277
 278 if __name__ == '__main__':
 279     import sys
 280     import os
 281     import optparse
 282
 283     address = os.environ['QGA_CLIENT_ADDRESS'] if 'QGA_CLIENT_ADDRESS' in os.environ else None
 284
 285     usage = "%prog [--address=<unix_path>|<ipv4_address>] <command> [args...]\n"
 286     usage += '<command>: ' + ', '.join(commands)
 287     parser = optparse.OptionParser(usage=usage)
 288     parser.add_option('--address', action='store', type='string',
 289                       default=address, help='Specify a ip:port pair or a unix socket path')
 290     options, args = parser.parse_args()
 291
 292     address = options.address
 293     if address is None:
 294         parser.error('address is not specified')
 295         sys.exit(1)
 296
 297     if len(args) == 0:
 298         parser.error('Less argument')
 299         sys.exit(1)
 300
 301     main(address, args[0], args[1:])