aef633e765
Pylint 2.16 adds a few new checks that cause the optional check-tox CI job to fail. 1. The superfluous-parens check seems to be a bit more aggressive, 2. broad-exception-raised is new; it discourages "raise Exception". Fix these minor issues and turn the lights green. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Beraldo Leal <bleal@redhat.com> Message-id: 20230210003147.1309376-2-jsnow@redhat.com Signed-off-by: John Snow <jsnow@redhat.com>
324 lines
9.3 KiB
Python
324 lines
9.3 KiB
Python
"""
|
|
QEMU Guest Agent Client
|
|
|
|
Usage:
|
|
|
|
Start QEMU with:
|
|
|
|
# qemu [...] -chardev socket,path=/tmp/qga.sock,server=on,wait=off,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
|
|
"""
|
|
|
|
# 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.
|
|
|
|
import argparse
|
|
import asyncio
|
|
import base64
|
|
import os
|
|
import random
|
|
import sys
|
|
from typing import (
|
|
Any,
|
|
Callable,
|
|
Dict,
|
|
Optional,
|
|
Sequence,
|
|
)
|
|
|
|
from qemu.qmp import ConnectError, SocketAddrT
|
|
from qemu.qmp.legacy import QEMUMonitorProtocol
|
|
|
|
|
|
# This script has not seen many patches or careful attention in quite
|
|
# some time. If you would like to improve it, please review the design
|
|
# carefully and add docstrings at that point in time. Until then:
|
|
|
|
# pylint: disable=missing-docstring
|
|
|
|
|
|
class QemuGuestAgent(QEMUMonitorProtocol):
|
|
def __getattr__(self, name: str) -> Callable[..., Any]:
|
|
def wrapper(**kwds: object) -> object:
|
|
return self.command('guest-' + name.replace('_', '-'), **kwds)
|
|
return wrapper
|
|
|
|
|
|
class QemuGuestAgentClient:
|
|
def __init__(self, address: SocketAddrT):
|
|
self.qga = QemuGuestAgent(address)
|
|
self.qga.connect(negotiate=False)
|
|
|
|
def sync(self, timeout: Optional[float] = 3) -> None:
|
|
# 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: int) -> bytes:
|
|
eof = False
|
|
data = b''
|
|
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: str) -> bytes:
|
|
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) -> str:
|
|
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)
|
|
|
|
@classmethod
|
|
def __gen_ipv4_netmask(cls, prefixlen: int) -> str:
|
|
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) -> str:
|
|
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(f"\tinet {addr} netmask {mask}")
|
|
elif ipaddr['ip-address-type'] == 'ipv6':
|
|
addr = ipaddr['ip-address']
|
|
prefix = ipaddr['prefix']
|
|
msgs.append(f"\tinet6 {addr} prefixlen {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: Optional[float]) -> bool:
|
|
self.qga.settimeout(timeout)
|
|
try:
|
|
self.qga.ping()
|
|
except asyncio.TimeoutError:
|
|
return False
|
|
return True
|
|
|
|
def fsfreeze(self, cmd: str) -> object:
|
|
if cmd not in ['status', 'freeze', 'thaw']:
|
|
raise ValueError('Invalid command: ' + cmd)
|
|
# Can be int (freeze, thaw) or GuestFsfreezeStatus (status)
|
|
return getattr(self.qga, 'fsfreeze' + '_' + cmd)()
|
|
|
|
def fstrim(self, minimum: int) -> Dict[str, object]:
|
|
# returns GuestFilesystemTrimResponse
|
|
ret = getattr(self.qga, 'fstrim')(minimum=minimum)
|
|
assert isinstance(ret, dict)
|
|
return ret
|
|
|
|
def suspend(self, mode: str) -> None:
|
|
if mode not in ['disk', 'ram', 'hybrid']:
|
|
raise ValueError('Invalid mode: ' + mode)
|
|
|
|
try:
|
|
getattr(self.qga, 'suspend' + '_' + mode)()
|
|
# On error exception will raise
|
|
except asyncio.TimeoutError:
|
|
# On success command will timed out
|
|
return
|
|
|
|
def shutdown(self, mode: str = 'powerdown') -> None:
|
|
if mode not in ['powerdown', 'halt', 'reboot']:
|
|
raise ValueError('Invalid mode: ' + mode)
|
|
|
|
try:
|
|
self.qga.shutdown(mode=mode)
|
|
except asyncio.TimeoutError:
|
|
pass
|
|
|
|
|
|
def _cmd_cat(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
if len(args) != 1:
|
|
print('Invalid argument')
|
|
print('Usage: cat <file>')
|
|
sys.exit(1)
|
|
print(client.read(args[0]))
|
|
|
|
|
|
def _cmd_fsfreeze(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
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)
|
|
return
|
|
|
|
assert isinstance(ret, int)
|
|
verb = 'frozen' if cmd == 'freeze' else 'thawed'
|
|
print(f"{ret:d} filesystems {verb}")
|
|
|
|
|
|
def _cmd_fstrim(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
if len(args) == 0:
|
|
minimum = 0
|
|
else:
|
|
minimum = int(args[0])
|
|
print(client.fstrim(minimum))
|
|
|
|
|
|
def _cmd_ifconfig(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
assert not args
|
|
print(client.ifconfig())
|
|
|
|
|
|
def _cmd_info(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
assert not args
|
|
print(client.info())
|
|
|
|
|
|
def _cmd_ping(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
timeout = 3.0 if len(args) == 0 else 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: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
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: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
assert not args
|
|
client.shutdown()
|
|
|
|
|
|
_cmd_powerdown = _cmd_shutdown
|
|
|
|
|
|
def _cmd_halt(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
assert not args
|
|
client.shutdown('halt')
|
|
|
|
|
|
def _cmd_reboot(client: QemuGuestAgentClient, args: Sequence[str]) -> None:
|
|
assert not args
|
|
client.shutdown('reboot')
|
|
|
|
|
|
commands = [m.replace('_cmd_', '') for m in dir() if '_cmd_' in m]
|
|
|
|
|
|
def send_command(address: str, cmd: str, args: Sequence[str]) -> None:
|
|
if not os.path.exists(address):
|
|
print(f"'{address}' not found. (Is QEMU running?)")
|
|
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 ConnectError as err:
|
|
print(err)
|
|
if isinstance(err.exc, ConnectionError):
|
|
print('(Is QEMU running?)')
|
|
sys.exit(1)
|
|
|
|
if cmd == 'fsfreeze' and args[0] == 'freeze':
|
|
client.sync(60)
|
|
elif cmd != 'ping':
|
|
client.sync()
|
|
|
|
globals()['_cmd_' + cmd](client, args)
|
|
|
|
|
|
def main() -> None:
|
|
address = os.environ.get('QGA_CLIENT_ADDRESS')
|
|
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument('--address', action='store',
|
|
default=address,
|
|
help='Specify a ip:port pair or a unix socket path')
|
|
parser.add_argument('command', choices=commands)
|
|
parser.add_argument('args', nargs='*')
|
|
|
|
args = parser.parse_args()
|
|
if args.address is None:
|
|
parser.error('address is not specified')
|
|
sys.exit(1)
|
|
|
|
send_command(args.address, args.command, args.args)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|