通过Python和DBus创建systemd临时计时器和服务的方法如下:
import dbus
from dbus import systemd1
bus = dbus.SystemBus()
manager_obj = bus.get_object('org.freedesktop.systemd1', '/org/freedesktop/systemd1')
manager = dbus.Interface(manager_obj, 'org.freedesktop.systemd1.Manager')
def create_timer(timer_name, time_delay):
timer_path = manager.CreateTimer({'OnUnitActiveSec': time_delay})
timer_obj = bus.get_object('org.freedesktop.systemd1', timer_path)
timer = dbus.Interface(timer_obj, 'org.freedesktop.systemd1.Timer')
timer_properties = dbus.Interface(timer_obj, 'org.freedesktop.DBus.Properties')
timer_properties.Set('org.freedesktop.systemd1.Timer', 'Persistent', False)
timer_properties.Set('org.freedesktop.systemd1.Timer', 'Unit', timer_name)
return timer_path
def create_service(service_name, service_exec):
service_path = manager.CreateService()
service_obj = bus.get_object('org.freedesktop.systemd1', service_path)
service = dbus.Interface(service_obj, 'org.freedesktop.systemd1.Service')
service_properties = dbus.Interface(service_obj, 'org.freedesktop.DBus.Properties')
service_properties.Set('org.freedesktop.systemd1.Service', 'ExecStart', service_exec)
service_properties.Set('org.freedesktop.systemd1.Service', 'Unit', service_name)
return service_path
# 创建一个5秒后执行的计时器和服务
timer_path = create_timer('example.timer', '5s')
service_path = create_service('example.service', '/bin/echo "Hello, World!"')
# 启动计时器和服务
manager.StartUnit(timer_path, 'replace')
manager.StartUnit(service_path, 'replace')
注意:这只是一个简单的示例代码,可以根据实际需求进行扩展和修改。在实际使用中,需要确保对DBus的操作具有足够的权限,并且正确处理异常情况。
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