问从systemd服务文件中设置“`xhost`”

EN

username@hostname:`$ DISPLAY=:0 xhost +
access control disabled, clients can connect from any host

username@hostname:/etc/systemd/system$ cat set-xhost.service 
[Unit]
Description=Set access control for X server

[Service]
Type=oneshot
Environment=DISPLAY=:0
ExecStart=/usr/bin/xhost +

[Install]
WantedBy=multi-user.target

username@hostname:~$ sudo systemctl start set-xhost.service
Job for set-xhost.service failed because the control process exited with error code. See "systemctl status set-xhost.service" and "journalctl -xe" for details.

username@hostname:~$ sudo journalctl -u set-xhost.service
Jun 09 12:09:28 hostname systemd[1]: Starting Set access control for X server...
Jun 09 12:09:28 hostname xhost[7067]: No protocol specified
Jun 09 12:09:28 hostname xhost[7067]: /usr/bin/xhost:  unable to open display ":0"
Jun 09 12:09:28 hostname systemd[1]: set-xhost.service: Main process exited, code=exited, status=1/FAILURE
Jun 09 12:09:28 hostname systemd[1]: Failed to start Set access control for X server.
Jun 09 12:09:28 hostname systemd[1]: set-xhost.service: Unit entered failed state.
Jun 09 12:09:28 hostname systemd[1]: set-xhost.service: Failed with result 'exit-code'.