Invalid argument for -config when using --xpra or --xorg

[Faeranne]

Command run: x11docker --xpra --sudo --verbose -- ' ' firefox /usr/bin/firefox
Docker file: firefox.txt
x11docker log file: x11docker.txt

I've tried multiple config options, but if I use --xpra or --xorg, I get this error. Seems Xorg is not happy with -config being an absolute location.

[mviereck]

Thanks for your feedback!
Which distribution do you use? Which Xorg version (Xorg -version)?
Here, on debian 9, it works fine, although Xorg -help tells me only a relative config path would be allowed. (More about allowed pathes on x.org )

-config file           specify a configuration file, relative to the
                       xorg.conf search path, only root can use absolute
-configdir dir         specify a configuration directory, relative to the
                       xorg.conf.d search path, only root can use absolute

Does xpra work on its own?

xpra start :10
xpra attach :10 &
DISPLAY=:10 xterm

And xpra started this way?

xpra start :20 --xvfb='Xorg -noreset -nolisten tcp +extension GLX +extension RANDR +extension RENDER -config /etc/xpra/xorg.conf' --no-daemon &
xpra attach :20 &
DISPLAY=:20 xterm

I'm not sure how to solve this, as I want to avoid creating files in /etc/X11.

[mviereck]

Option --xorg can not be affected by this, it does not use switch -config. Only --xpra and --xdummy need to specify a config file for X to use Xdummy video driver.
Depending on your setup and system, --xorg may only run from console.
If you have an error with --xorg, please show me the logfile for this, too.

[Faeranne]

My current OS is Ubuntu 16.04, which seems to be the problem. 16.04 handles Xorg in a very strange and roundabout way, which forces all Xorg instances to be setuid. This in-turn precludes the use of either --config or --logfile.
I'm going to close this, as it seems that these issues affect xpra, not x11docker.

[Faeranne]

https://xpra.org/trac/ticket/1220 is the upstream issue.

[mviereck]

Thanks!
I made a little workaround: If you install xvfb, x11docker will use it instead of Xdummy. That should work on Ubuntu 16.04, too.

For use of option --xorg on Ubuntu 16.04, you need package xserver-xorg-legacy and edit file /etc/X11/Xwrapper.conf.
Replace line:
allowed_users=console
with lines
allowed_users=anybody
needs_root_rights=yes

[Faeranne]

Unfortunately xvfb still triggers the -config issue in 16.04. Seems xvfb still runs Xorg at some point with -config.

[mviereck]

Do you use the latest version of x11docker? Xvfb is independent from Xorg and is called without any -config option. Can you check your x11docker version (x11docker --version). The current one is 3.1.8.
The logfile should show "Xvfb" in "Created X server command".