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https://gitlab.com/libvirt/libvirt-python.git
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f496dc55ee
Break import into multiple lines as recommended by PEP-8 Move imports to top Remove unused imports Signed-off-by: Philipp Hahn <hahn@univention.de>
95 lines
3.2 KiB
Python
95 lines
3.2 KiB
Python
#!/usr/bin/env python3
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# consolecallback - provide a persistent console that survives guest reboots
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import os
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import logging
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import libvirt
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import tty
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import termios
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import atexit
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from argparse import ArgumentParser
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from typing import Optional # noqa F401
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def reset_term() -> None:
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termios.tcsetattr(0, termios.TCSADRAIN, attrs)
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def error_handler(unused, error) -> None:
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# The console stream errors on VM shutdown; we don't care
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if (error[0] == libvirt.VIR_ERR_RPC and
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error[1] == libvirt.VIR_FROM_STREAMS):
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return
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logging.warn(error)
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class Console(object):
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def __init__(self, uri: str, uuid: str) -> None:
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self.uri = uri
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self.uuid = uuid
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self.connection = libvirt.open(uri)
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self.domain = self.connection.lookupByUUIDString(uuid)
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self.state = self.domain.state(0)
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self.connection.domainEventRegister(lifecycle_callback, self)
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self.stream = None # type: Optional[libvirt.virStream]
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self.run_console = True
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self.stdin_watch = -1
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logging.info("%s initial state %d, reason %d",
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self.uuid, self.state[0], self.state[1])
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def check_console(console: Console) -> bool:
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if (console.state[0] == libvirt.VIR_DOMAIN_RUNNING or
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console.state[0] == libvirt.VIR_DOMAIN_PAUSED):
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if console.stream is None:
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console.stream = console.connection.newStream(libvirt.VIR_STREAM_NONBLOCK)
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console.domain.openConsole(None, console.stream, 0)
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console.stream.eventAddCallback(libvirt.VIR_STREAM_EVENT_READABLE, stream_callback, console)
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else:
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if console.stream:
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console.stream.eventRemoveCallback()
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console.stream = None
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return console.run_console
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def stdin_callback(watch: int, fd: int, events: int, console: Console) -> None:
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readbuf = os.read(fd, 1024)
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if readbuf.startswith(b" "):
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console.run_console = False
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return
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if console.stream:
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console.stream.send(readbuf)
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def stream_callback(stream: libvirt.virStream, events: int, console: Console) -> None:
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try:
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assert console.stream
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received_data = console.stream.recv(1024)
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except Exception:
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return
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os.write(0, received_data)
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def lifecycle_callback(connection: libvirt.virConnect, domain: libvirt.virDomain, event: int, detail: int, console: Console) -> None:
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console.state = console.domain.state(0)
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logging.info("%s transitioned to state %d, reason %d",
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console.uuid, console.state[0], console.state[1])
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# main
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parser = ArgumentParser(epilog="Example: %(prog)s 'qemu:///system' '32ad945f-7e78-c33a-e96d-39f25e025d81'")
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parser.add_argument("uri")
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parser.add_argument("uuid")
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args = parser.parse_args()
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print("Escape character is ^]")
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logging.basicConfig(filename='msg.log', level=logging.DEBUG)
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logging.info("URI: %s", args.uri)
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logging.info("UUID: %s", args.uuid)
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libvirt.virEventRegisterDefaultImpl()
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libvirt.registerErrorHandler(error_handler, None)
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atexit.register(reset_term)
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attrs = termios.tcgetattr(0)
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tty.setraw(0)
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console = Console(args.uri, args.uuid)
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console.stdin_watch = libvirt.virEventAddHandle(0, libvirt.VIR_EVENT_HANDLE_READABLE, stdin_callback, console)
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while check_console(console):
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libvirt.virEventRunDefaultImpl()
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