Hello Ludo,

Does the :100 server show up when you do 'xpra list' after the command?

If so, can you try the following commands to see if it works:
$ guix environment --ad-hoc xpra --pure -- xpra attach :100
And then on a different terminal:
$ DISPLAY=:100 gui-program

On Fri, 09 Nov 2018 15:12:25 +0100
ludovic.courtes@inria.fr (Ludovic Courtès) wrote:

> Hello Rutger and all,
> 
> Our Xpra package seems to not be usable directly without installing
> additional items:
> 
> --8<---------------cut here---------------start------------->8---
> $ guix environment --ad-hoc xpra --pure -- xpra start :100
> Warning: Xorg binary not found, assuming the wrapper is needed!
> Entering daemon mode; any further errors will be reported to:
>   /run/user/1000/xpra/:100.log
> $ cat /run/user/1000/xpra/:100.log
> 2018-11-09 14:37:42,986 Error: cannot enable SSH socket upgrades:
> 2018-11-09 14:37:42,986  No module named paramiko
> 2018-11-09 14:37:42,987 cannot access python uinput module:
> 2018-11-09 14:37:42,987  No module named uinput
> 2018-11-09 14:37:42,995 Error adding xauth entry for :100
> 2018-11-09 14:37:42,995  using command "xauth
> -f /home/ludo/.Xauthority add :100 MIT-MAGIC-COOKIE-1
> 7c2c66d9295545cfb1c27b1109b4b54e": [mi] Extension "Composite" is not
> recognized 2018-11-09 14:37:42,995  [Errno 2] No such file or
> directory [mi] Only the following extensions can be run-time enabled:
> [mi]    Generic Event Extension [mi]    MIT-SHM
> [mi]    XTEST
> [mi]    XINERAMA
> [mi]    XFIXES
> [mi]    RENDER
> [mi]    RANDR
> [mi]    COMPOSITE
> [mi]    DAMAGE
> [mi]    MIT-SCREEN-SAVER
> [mi]    DOUBLE-BUFFER
> [mi]    RECORD
> [mi]    DPMS
> [mi]    X-Resource
> [mi]    XVideo
> [mi]    XVideo-MotionCompensation
> [mi]    GLX
> No protocol specified
> No protocol specified
> No protocol specified
> No protocol specified
> No protocol specified
> No protocol specified
> No protocol specified
> No protocol specified
> No protocol specified
> No protocol specified
> --8<---------------cut here---------------end--------------->8---
> 
> On a foreign distro I see we’re also lacking a reference to
> ‘dbus-launch’:
> 
> --8<---------------cut here---------------start------------->8---
> [courtes@devel13 ~]$ guix environment --ad-hoc xpra --pure -- xpra
> start :100 Warning: Xorg binary not found, assuming the wrapper is
> needed! Entering daemon mode; any further errors will be reported to:
>   /run/user/10218/xpra/:100.log
> [courtes@devel13 ~]$ cat /run/user/10218/xpra/:100.log
> 2018-11-09 15:10:06,064 Error: cannot enable SSH socket upgrades:
> 2018-11-09 15:10:06,064  No module named paramiko
> 2018-11-09 15:10:06,066 cannot access python uinput module:
> 2018-11-09 15:10:06,066  No module named uinput
> 2018-11-09 15:10:06,079 Error adding xauth entry for :100
> 2018-11-09 15:10:06,080  using command "xauth
> -f /home/courtes/.Xauthority add :100 MIT-MAGIC-COOKIE-1
> 9519cb23f6a348eda7f068d9317a664c": 2018-11-09 15:10:06,080  [Errno 2]
> No such file or directory [mi] Extension "Composite" is not
> recognized [mi] Only the following extensions can be run-time
> enabled: [mi]    Generic Event Extension [mi]    MIT-SHM
> [mi]    XTEST
> [mi]    XINERAMA
> [mi]    XFIXES
> [mi]    RENDER
> [mi]    RANDR
> [mi]    COMPOSITE
> [mi]    DAMAGE
> [mi]    MIT-SCREEN-SAVER
> [mi]    DOUBLE-BUFFER
> [mi]    RECORD
> [mi]    DPMS
> [mi]    X-Resource
> [mi]    XVideo
> [mi]    XVideo-MotionCompensation
> [mi]    GLX
> 2018-11-09 15:10:06,472 Warning: some of the sockets are in an
> unknown state: 2018-11-09
> 15:10:06,473  /home/courtes/.xpra/devel13-100 2018-11-09
> 15:10:06,473  please wait as we allow the socket probing to timeout
> 2018-11-09 15:10:12,502 created unix domain
> socket: /home/courtes/.xpra/devel13-100 /gnu/store/rbrandv7anzjxqkr40d7fkanzssslk4b-bash-minimal-4.4.19/bin/sh:
> dbus-launch: command not found dbus-launch failed to start using
> command 'dbus-launch --close-stderr':
> 
>  exit code is 127
> 
> --8<---------------cut here---------------end--------------->8---
> 
> Thoughts?
> 
> Thanks in advance,
> Ludo’.