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systemd-stable/units/systemd-udevd-control.socket
Michal Sekletar 51bce29f8e units: remove udev control socket when systemd stops the socket unit (#4039)
Mere presence of the socket in the filesystem makes
udev_queue_get_udev_is_active() return that udev is running. Note that,
udev on exit doesn't unlink control socket nor does systemd. Thus socket
stays around even when both daemon and socket are stopped. This causes
problems for cryptsetup because when it detects running udev it launches
synchronous operations that *really* require udev. This in turn may
cause blocking and subsequent timeout in systemd-cryptsetup on reboot
while machine is in a state that udev and its control socket units are
stopped, e.g. emergency mode.

Fixes #2477
2016-08-26 00:07:58 +02:00

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SYSTEMD

# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=udev Control Socket
Documentation=man:systemd-udevd.service(8) man:udev(7)
DefaultDependencies=no
Before=sockets.target
ConditionPathIsReadWrite=/sys
[Socket]
Service=systemd-udevd.service
ListenSequentialPacket=/run/udev/control
SocketMode=0600
PassCredentials=yes
RemoveOnStop=yes