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#!/usr/bin/python3
# dbus-monitor --system "path=/org/freedesktop/NetworkManager,interface=org.freedesktop.DBus.Properties,type=signal,member=PropertiesChanged"
from gi.repository import GLib
import pydbus
loop = GLib.MainLoop()
systemd = pydbus.SessionBus().get(".systemd1")
nm = pydbus.SystemBus().get("org.freedesktop.NetworkManager", "/org/freedesktop/NetworkManager")
# https://developer.gnome.org/NetworkManager/stable/nm-dbus-types.html#NMMetered
# 0 = The metered status is unknown
# 1 = Metered, the value was statically set
# 2 = Not metered, the value was statically set
# 3 = Metered, the value was guessed
# 4 = Not metered, the value was guessed
def check_metered(changed):
value=nm.Metered
if (value == 2 or value == 4):
# start unit (replace any conflicting requests that might have been
# enqueued to systemctl but not yet run)
systemd.StartUnit("unmetered-internet.target", "replace")
else:
systemd.StopUnit("unmetered-internet.target", "replace")
nm.PropertiesChanged.connect(check_metered)
loop.run()
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