Writing to clipboard in a command line flatpak.

[Emil Johansson]

Hey,

I am trying to make a flatpak version of my command line application
https://github.com/emiljoha/mpw. I have gotten most of the dependencies in
order but I have not been able to figure out how to write to the clipboard.

I have managed to bundle wl-clipboard but it says it cannot connect to a
wayland server. Looking in the source code of wl-clipboard it gets NULL
back from wl_display_connect. From the documentation I can find
https://manpages.debian.org/experimental/libwayland-doc/wl_display_connect.3.en.html

> *wl_display_connect* connects to a Wayland socket that was previously
opened by a Wayland server. The server socket must be placed in
*XDG_RUNTIME_DIR* when *WAYLAND_DISPLAY* (or *name*, see below) is a simple
name, for this function to find it. The server socket is also allowed to
exist at an arbitrary path

wl-copy.c call the function with NULL as the name.

I have in my manifest.
finish-args:
   --socket=fallback-x11
   --share=ipc

More details and the code of my attempt can be found in the PR
https://github.com/emiljoha/mpw/pull/21

Thanks
Emil
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