如何监控USB设备插入？

Question

我正在尝试在 USB 设备插入时对其进行监控。几个测试脚本失败了，我很确定应该可以。

import pyudev

context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem='usb')

for device in iter(monitor.poll, None):
    if device.action == 'add':
        print('{} connected'.format(device))

^^什么都不做。没有错误，没有输出。

我试试

import dbus
bus = dbus.SystemBus()
obj = bus.get_object('org.freedesktop.NetworkManager', '/org/freedesktop/NetworkManager')
obj.GetDevices()

输出如下错误：

Traceback (most recent call last):
  File "crap.py", line 4, in <module>
    obj.GetDevices()
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: No such interface '(null)' on object at path /org/freedesktop/NetworkManager

dbus 在 Linux Mint 和 Pi3

上都阻止了我

如何在 python3 中监控 USB 设备？

Answer 1

pyudev 访问 linux udevadm 工具。使用此设备连接/分离事件由 udevadm monitor

监控

如果您使用 python 子进程调用调用 udevadm monitor 会发生什么情况？

  from subprocess import call
  call(["udevadm","monitor"])

如果你使用来自 pyudev 的 MonitorObserver 会发生什么？

您是否尝试过以 root 身份调用 python（脚本）？

以下两个变体在没有 root 的情况下为我工作，并作为带有 -i 选项的脚本调用：

from pyudev import Context, Monitor

context = Context()
monitor = Monitor.from_netlink(context)
device = monitor.poll(timeout=None)
if device:
    print('{0.action}: {0}'.format(device))

-

from pyudev import Context, Monitor, MonitorObserver

context = Context()
monitor = Monitor.from_netlink(context)
monitor.filter_by(subsystem='usb')
def print_device_event(device):
    print('background event {0.action}: {0.device_path}'.format(device))
observer = MonitorObserver(monitor, callback=print_device_event, name='monitor-observer')
observer.daemon
observer.start()

如何监控USB设备插入？

How to monitor usb devices insertion?

python

linux

usb

dbus

pyudev