bug#26202: Guix in foreign distributions: setting XDG_DATA_DIRS causes user session to not start

[Adonay Felipe Nogueira <adfeno@openmailbox.org>]

It turns out that the XDG_DATA_DIRS bug is due to foreign distributions
using some Xsession.d scripts that do tests to check if that variable is
empty, and if it does exist, then they do nothing. This causes the
system to simply not set XDG_DATA_DIRS to useful values for foreign
distributions, thus leaving the user with a never-ending log-in loop.

So what must the user do?

1. Test without setting XDG_DATA_DIRS, and take note of its value.

2. Set XDG_DATA_DIRS as Guix tells you to, however, replace the
following part:

${XDG_DATA_DIRS:+:}$XDG_DATA_DIRS

With the following:

:[Value that you took note of, without this surrounding braces.]

I hope this helps. :)


Respectfully, Adonay.
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