晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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import dbus
import tuned.logs
log = tuned.logs.get()
class polkit():
def __init__(self):
self._bus = dbus.SystemBus()
self._proxy = self._bus.get_object('org.freedesktop.PolicyKit1', '/org/freedesktop/PolicyKit1/Authority', follow_name_owner_changes = True)
self._authority = dbus.Interface(self._proxy, dbus_interface='org.freedesktop.PolicyKit1.Authority')
def check_authorization(self, sender, action_id):
"""Check authorization, return codes:
1 - authorized
2 - polkit error, but authorized with fallback method
0 - unauthorized
-1 - polkit error and unauthorized by the fallback method
-2 - polkit error and unable to use the fallback method
"""
if sender is None or action_id is None:
return False
details = {}
flags = 1 # AllowUserInteraction flag
cancellation_id = "" # No cancellation id
subject = ("system-bus-name", {"name" : sender})
try:
ret = self._authority.CheckAuthorization(subject, action_id, details, flags, cancellation_id)[0]
except (dbus.exceptions.DBusException, ValueError) as e:
log.error("error querying polkit: %s" % e)
# No polkit or polkit error, fallback to always allow root
try:
uid = self._bus.get_unix_user(sender)
except dbus.exceptions.DBusException as e:
log.error("error using fallback authorization method: %s" % e)
return -2
if uid == 0:
return 2
else:
return -1
return 1 if ret else 0