324 lines
9.3 KiB
Python
324 lines
9.3 KiB
Python
"""
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QEMU Guest Agent Client
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Usage:
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Start QEMU with:
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# qemu [...] -chardev socket,path=/tmp/qga.sock,server=on,wait=off,id=qga0 \
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-device virtio-serial \
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-device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0
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Run the script:
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$ qemu-ga-client --address=/tmp/qga.sock <command> [args...]
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or
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$ export QGA_CLIENT_ADDRESS=/tmp/qga.sock
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$ qemu-ga-client <command> [args...]
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For example:
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$ qemu-ga-client cat /etc/resolv.conf
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# Generated by NetworkManager
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nameserver 10.0.2.3
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$ qemu-ga-client fsfreeze status
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thawed
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$ qemu-ga-client fsfreeze freeze
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2 filesystems frozen
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See also: https://wiki.qemu.org/Features/QAPI/GuestAgent
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"""
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# Copyright (C) 2012 Ryota Ozaki <ozaki.ryota@gmail.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2. See
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# the COPYING file in the top-level directory.
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import argparse
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import asyncio
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import base64
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import os
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import random
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import sys
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from typing import (
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Any,
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Callable,
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Dict,
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Optional,
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Sequence,
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)
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from qemu.qmp import ConnectError, SocketAddrT
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from qemu.qmp.legacy import QEMUMonitorProtocol
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# This script has not seen many patches or careful attention in quite
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# some time. If you would like to improve it, please review the design
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# carefully and add docstrings at that point in time. Until then:
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# pylint: disable=missing-docstring
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class QemuGuestAgent(QEMUMonitorProtocol):
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def __getattr__(self, name: str) -> Callable[..., Any]:
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def wrapper(**kwds: object) -> object:
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return self.command('guest-' + name.replace('_', '-'), **kwds)
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return wrapper
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class QemuGuestAgentClient:
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def __init__(self, address: SocketAddrT):
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self.qga = QemuGuestAgent(address)
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self.qga.connect(negotiate=False)
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def sync(self, timeout: Optional[float] = 3) -> None:
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# Avoid being blocked forever
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if not self.ping(timeout):
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raise EnvironmentError('Agent seems not alive')
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uid = random.randint(0, (1 << 32) - 1)
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while True:
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ret = self.qga.sync(id=uid)
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if isinstance(ret, int) and int(ret) == uid:
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break
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def __file_read_all(self, handle: int) -> bytes:
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eof = False
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data = b''
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while not eof:
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ret = self.qga.file_read(handle=handle, count=1024)
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_data = base64.b64decode(ret['buf-b64'])
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data += _data
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eof = ret['eof']
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return data
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def read(self, path: str) -> bytes:
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handle = self.qga.file_open(path=path)
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try:
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data = self.__file_read_all(handle)
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finally:
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self.qga.file_close(handle=handle)
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return data
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def info(self) -> str:
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info = self.qga.info()
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msgs = []
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msgs.append('version: ' + info['version'])
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msgs.append('supported_commands:')
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enabled = [c['name'] for c in info['supported_commands']
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if c['enabled']]
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msgs.append('\tenabled: ' + ', '.join(enabled))
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disabled = [c['name'] for c in info['supported_commands']
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if not c['enabled']]
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msgs.append('\tdisabled: ' + ', '.join(disabled))
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return '\n'.join(msgs)
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@classmethod
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def __gen_ipv4_netmask(cls, prefixlen: int) -> str:
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mask = int('1' * prefixlen + '0' * (32 - prefixlen), 2)
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return '.'.join([str(mask >> 24),
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str((mask >> 16) & 0xff),
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str((mask >> 8) & 0xff),
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str(mask & 0xff)])
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def ifconfig(self) -> str:
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nifs = self.qga.network_get_interfaces()
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msgs = []
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for nif in nifs:
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msgs.append(nif['name'] + ':')
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if 'ip-addresses' in nif:
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for ipaddr in nif['ip-addresses']:
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if ipaddr['ip-address-type'] == 'ipv4':
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addr = ipaddr['ip-address']
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mask = self.__gen_ipv4_netmask(int(ipaddr['prefix']))
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msgs.append(f"\tinet {addr} netmask {mask}")
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elif ipaddr['ip-address-type'] == 'ipv6':
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addr = ipaddr['ip-address']
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prefix = ipaddr['prefix']
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msgs.append(f"\tinet6 {addr} prefixlen {prefix}")
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if nif['hardware-address'] != '00:00:00:00:00:00':
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msgs.append("\tether " + nif['hardware-address'])
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return '\n'.join(msgs)
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def ping(self, timeout: Optional[float]) -> bool:
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self.qga.settimeout(timeout)
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try:
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self.qga.ping()
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except asyncio.TimeoutError:
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return False
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return True
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def fsfreeze(self, cmd: str) -> object:
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if cmd not in ['status', 'freeze', 'thaw']:
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raise Exception('Invalid command: ' + cmd)
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# Can be int (freeze, thaw) or GuestFsfreezeStatus (status)
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return getattr(self.qga, 'fsfreeze' + '_' + cmd)()
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def fstrim(self, minimum: int) -> Dict[str, object]:
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# returns GuestFilesystemTrimResponse
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ret = getattr(self.qga, 'fstrim')(minimum=minimum)
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assert isinstance(ret, dict)
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return ret
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def suspend(self, mode: str) -> None:
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if mode not in ['disk', 'ram', 'hybrid']:
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raise Exception('Invalid mode: ' + mode)
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try:
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getattr(self.qga, 'suspend' + '_' + mode)()
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# On error exception will raise
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except asyncio.TimeoutError:
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# On success command will timed out
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return
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def shutdown(self, mode: str = 'powerdown') -> None:
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if mode not in ['powerdown', 'halt', 'reboot']:
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raise Exception('Invalid mode: ' + mode)
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try:
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self.qga.shutdown(mode=mode)
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except asyncio.TimeoutError:
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pass
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def _cmd_cat(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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if len(args) != 1:
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print('Invalid argument')
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print('Usage: cat <file>')
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sys.exit(1)
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print(client.read(args[0]))
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def _cmd_fsfreeze(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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usage = 'Usage: fsfreeze status|freeze|thaw'
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if len(args) != 1:
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print('Invalid argument')
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print(usage)
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sys.exit(1)
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if args[0] not in ['status', 'freeze', 'thaw']:
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print('Invalid command: ' + args[0])
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print(usage)
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sys.exit(1)
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cmd = args[0]
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ret = client.fsfreeze(cmd)
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if cmd == 'status':
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print(ret)
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return
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assert isinstance(ret, int)
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verb = 'frozen' if cmd == 'freeze' else 'thawed'
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print(f"{ret:d} filesystems {verb}")
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def _cmd_fstrim(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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if len(args) == 0:
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minimum = 0
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else:
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minimum = int(args[0])
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print(client.fstrim(minimum))
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def _cmd_ifconfig(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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assert not args
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print(client.ifconfig())
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def _cmd_info(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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assert not args
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print(client.info())
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def _cmd_ping(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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timeout = 3.0 if len(args) == 0 else float(args[0])
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alive = client.ping(timeout)
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if not alive:
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print("Not responded in %s sec" % args[0])
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sys.exit(1)
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def _cmd_suspend(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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usage = 'Usage: suspend disk|ram|hybrid'
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if len(args) != 1:
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print('Less argument')
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print(usage)
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sys.exit(1)
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if args[0] not in ['disk', 'ram', 'hybrid']:
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print('Invalid command: ' + args[0])
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print(usage)
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sys.exit(1)
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client.suspend(args[0])
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def _cmd_shutdown(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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assert not args
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client.shutdown()
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_cmd_powerdown = _cmd_shutdown
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def _cmd_halt(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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assert not args
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client.shutdown('halt')
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def _cmd_reboot(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
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assert not args
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client.shutdown('reboot')
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commands = [m.replace('_cmd_', '') for m in dir() if '_cmd_' in m]
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def send_command(address: str, cmd: str, args: Sequence[str]) -> None:
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if not os.path.exists(address):
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print(f"'{address}' not found. (Is QEMU running?)")
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sys.exit(1)
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if cmd not in commands:
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print('Invalid command: ' + cmd)
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print('Available commands: ' + ', '.join(commands))
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sys.exit(1)
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try:
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client = QemuGuestAgentClient(address)
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except ConnectError as err:
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print(err)
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if isinstance(err.exc, ConnectionError):
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print('(Is QEMU running?)')
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sys.exit(1)
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if cmd == 'fsfreeze' and args[0] == 'freeze':
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client.sync(60)
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elif cmd != 'ping':
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client.sync()
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globals()['_cmd_' + cmd](client, args)
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def main() -> None:
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address = os.environ.get('QGA_CLIENT_ADDRESS')
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parser = argparse.ArgumentParser()
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parser.add_argument('--address', action='store',
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default=address,
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help='Specify a ip:port pair or a unix socket path')
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parser.add_argument('command', choices=commands)
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parser.add_argument('args', nargs='*')
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args = parser.parse_args()
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if args.address is None:
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parser.error('address is not specified')
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sys.exit(1)
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send_command(args.address, args.command, args.args)
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if __name__ == '__main__':
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main()
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