Comment # 29 on bug 1213222 from Josef Reidinger

well, as dracut exit with exit code 3, we should show error popup with saying
that it failed and also it prints stderr text. I worry we cannot make there
much assumption, but of course if needed, we can improve that popup to be more
specific to dracut ( now it is generic command failed popup ).

Related code parts:

bootloader calling dracut -
https://github.com/yast/yast-bootloader/blob/13381cf1d65894af1fdd2b19cf4244059bb742f1/src/lib/bootloader/finish_client.rb#L86

and execute where popup is raised:
https://github.com/yast/yast-yast2/blob/c443e4d77fabffbf743259906eb5e3fae723d266/library/system/src/lib/yast2/execute.rb#L237