[bug#59825] [PATCH] gnu: Add flatpak-xdg-utils.

[John Kehayias]

Hi Guix,

Here is a little package from the Flatpak folks which is also useful in a guix 
shell container. This lets you run, for example, xdg-open in the container and 
it will open on the host side. So let's say you come across a URL, you can just 
use xdg-open from this package so it will open in the host's web browser, 
rather than trying in the container. This relies on having portals on the host 
side, like xdg-desktop-portal-gtk.

Here is a simple test example:

--8<---------------cut here---------------start------------->8---
guix shell -NC flatpak-xdg-utils --preserve='^DBUS_SESSION_BUS_ADDRESS$' -- 
xdg-open "<https://guix.gnu.org>"
--8<---------------cut here---------------end--------------->8---

which will open Guix's website on the host side.

I've checked it works, the license (some files LGPL2+ other LGPL2.1+), linted, 
and styled. I adjusted the description from upstream slightly to indicate it is 
not just for Flatpak sandboxes.

Thanks!
John

0001-gnu-Add-flatpak-xdg-utils.patch
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