Regression introduced by 44c64fef16.
The services.xserver.layout option allows to specify more than one
layout separated by comma, which the commit above didn't take into
account.
This is very similar to @lheckemann's pull request (#26984) but differs
in the following ways:
* Print out the full list available layouts (as suggested by @0xABAB
in [1]).
* Loop over $layout using the default IFS (and thus no need for
escaping ${cfg.layout}), because the layouts won't contain white
spaces.
* Re-do the error message, which now uses multiple echos instead of a
heredoc, so the line is wrapped according to the viewers terminal
width.
I've tested this with several good and bad layouts and also against the
keymap NixOS VM subtests.
[1]: https://github.com/NixOS/nixpkgs/pull/26984#discussion_r125146700
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Fixes: #26961
Closes: #26984
69da1807f0