mirror of
https://github.com/retspen/webvirtcloud
synced 2024-12-26 16:15:25 +00:00
100 lines
3.2 KiB
Python
Executable file
100 lines
3.2 KiB
Python
Executable file
#!/usr/bin/env python3
|
||
# consolecallback - provide a persistent console that survives guest reboots
|
||
|
||
import os
|
||
import logging
|
||
import libvirt
|
||
import tty
|
||
import termios
|
||
import atexit
|
||
from argparse import ArgumentParser
|
||
from typing import Optional # noqa F401
|
||
|
||
|
||
def reset_term() -> None:
|
||
termios.tcsetattr(0, termios.TCSADRAIN, attrs)
|
||
|
||
|
||
def error_handler(unused, error) -> None:
|
||
# The console stream errors on VM shutdown; we don't care
|
||
if error[0] == libvirt.VIR_ERR_RPC and error[1] == libvirt.VIR_FROM_STREAMS:
|
||
return
|
||
logging.warning(error)
|
||
|
||
|
||
class Console(object):
|
||
def __init__(self, uri: str, uuid: str) -> None:
|
||
self.uri = uri
|
||
self.uuid = uuid
|
||
self.connection = libvirt.open(uri)
|
||
self.domain = self.connection.lookupByUUIDString(uuid)
|
||
self.state = self.domain.state(0)
|
||
self.connection.domainEventRegister(lifecycle_callback, self)
|
||
self.stream = None # type: Optional[libvirt.virStream]
|
||
self.run_console = True
|
||
self.stdin_watch = -1
|
||
logging.info("%s initial state %d, reason %d",
|
||
self.uuid, self.state[0], self.state[1])
|
||
|
||
|
||
def check_console(console: Console) -> bool:
|
||
if (console.state[0] == libvirt.VIR_DOMAIN_RUNNING or console.state[0] == libvirt.VIR_DOMAIN_PAUSED):
|
||
if console.stream is None:
|
||
console.stream = console.connection.newStream(libvirt.VIR_STREAM_NONBLOCK)
|
||
console.domain.openConsole(None, console.stream, 0)
|
||
console.stream.eventAddCallback(libvirt.VIR_STREAM_EVENT_READABLE, stream_callback, console)
|
||
else:
|
||
if console.stream:
|
||
console.stream.eventRemoveCallback()
|
||
console.stream = None
|
||
|
||
return console.run_console
|
||
|
||
|
||
def stdin_callback(watch: int, fd: int, events: int, console: Console) -> None:
|
||
readbuf = os.read(fd, 1024)
|
||
if readbuf.startswith(b" "):
|
||
console.run_console = False
|
||
return
|
||
if console.stream:
|
||
console.stream.send(readbuf)
|
||
|
||
|
||
def stream_callback(stream: libvirt.virStream, events: int, console: Console) -> None:
|
||
try:
|
||
assert console.stream
|
||
received_data = console.stream.recv(1024)
|
||
except Exception:
|
||
return
|
||
os.write(0, received_data)
|
||
|
||
|
||
def lifecycle_callback(connection: libvirt.virConnect, domain: libvirt.virDomain, event: int, detail: int, console: Console) -> None:
|
||
console.state = console.domain.state(0)
|
||
logging.info("%s transitioned to state %d, reason %d",
|
||
console.uuid, console.state[0], console.state[1])
|
||
|
||
|
||
# main
|
||
parser = ArgumentParser(epilog="Example: %(prog)s 'qemu:///system' '32ad945f-7e78-c33a-e96d-39f25e025d81'")
|
||
parser.add_argument("uri")
|
||
parser.add_argument("uuid")
|
||
args = parser.parse_args()
|
||
|
||
print("Escape character is ^]")
|
||
logging.basicConfig(filename='msg.log', level=logging.DEBUG)
|
||
logging.info("URI: %s", args.uri)
|
||
logging.info("UUID: %s", args.uuid)
|
||
|
||
libvirt.virEventRegisterDefaultImpl()
|
||
libvirt.registerErrorHandler(error_handler, None)
|
||
|
||
atexit.register(reset_term)
|
||
attrs = termios.tcgetattr(0)
|
||
tty.setraw(0)
|
||
|
||
console = Console(args.uri, args.uuid)
|
||
console.stdin_watch = libvirt.virEventAddHandle(0, libvirt.VIR_EVENT_HANDLE_READABLE, stdin_callback, console)
|
||
|
||
while check_console(console):
|
||
libvirt.virEventRunDefaultImpl()
|