Hi,

The keytable preference might specify the file extension (like
us.map.gz), while systemd-firstboot actually expects only the
keymap name [0].

Until recently [1], systemd-firstboot would not validate the
supplied keymap, so /etc/vconsole.conf was always updated even
if the keymap is wrong.

After the recent change, kiwi would fail with this error message
when using the full file name as a keytable:

[   91s] [ INFO    ]: 11:04:56 | Setting up keytable: us.map.gz
[   91s] [ DEBUG   ]: 11:04:56 | EXEC: [chroot /usr/src/packages/KIWI-vmx/build/image-root systemd-firstboot --help]
[   91s] [ DEBUG   ]: 11:04:56 | EXEC: [chroot /usr/src/packages/KIWI-vmx/build/image-root systemd-firstboot --keymap=us.map.gz]
[   91s] [ DEBUG   ]: 11:04:56 | EXEC: Failed with stderr: Keymap us.map.gz is not installed.
[   91s] , stdout: (no output on stdout)
[   91s] [ ERROR   ]: 11:04:56 | KiwiCommandError: chroot: stderr: Keymap us.map.gz is not installed.
[   91s] , stdout: (no output on stdout)

[0] https://man7.org/linux/man-pages/man1/systemd-firstboot.1.html
[1] https://github.com/systemd/systemd/commit/321a8c595e3470a0fe9002014656eee6a50b9553