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#1 2021-06-05 09:06:34

zw963
Member
Registered: 2018-06-18
Posts: 137

xhost +SI:localuser:root not works in systemd ExecStartPre

I have a service file like this:

[Unit]
Description=xkeysnail

[Service]
# DISPLAY 的值应该和 `echo $DISPLAY` 的值相同
Environment=DISPLAY=:0
ExecStartPre=xhost +SI:localuser:root
ExecStart=/usr/bin/xkeysnail -q --watch /home/zw963/utils/xkeysnail/config.py
Type=simple
Restart=always
RestartSec=2

[Install]
WantedBy=graphical.target

but it not work, because get error like this:


Xlib.error.DisplayConnectionError: Can't connect to display ":0": b'Authorization required, but no authorization protocol specified\n'


The workaround is, i have to add above xhost code into .bashrc.

# .bashrc
xhost +SI:localuser:root

no,the service file start to works now.

Thank you.

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#2 2021-06-05 09:47:42

tucuxi
Member
From: Switzerland
Registered: 2020-03-08
Posts: 194

Re: xhost +SI:localuser:root not works in systemd ExecStartPre

You omitted to say if the service is a system or user service. I will assume the latter. Tools to diagnose the problem include `systemctl` and `journalctl`.

You could write a script that does two things: call xhost and launch xkeysnail. Then invoke the script in your user service.

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#3 2021-06-05 09:56:09

zw963
Member
Registered: 2018-06-18
Posts: 137

Re: xhost +SI:localuser:root not works in systemd ExecStartPre

You omitted to say if the service is a system or user service. I will assume the latter. Tools to diagnose the problem include `systemctl` and `journalctl`.

this is a system service. as i said, the failing message in journal is:

Authorization required, but no authorization protocol specified

I guess root can't access X cause this.

You could write a script that does two things: call xhost and launch xkeysnail. Then invoke the script in your user service.

Yes, i guess it will works, but anyway, i want to know why this same services can work on others arch, but not works for me.

BTW: i use GNOME 40 + Wayland.

EDIT:

in fact, add xhost code into shell script not work. i guess those xhost command should be run on current user instead of root.

Last edited by zw963 (2021-06-05 11:31:52)

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