Can you please explain which none bash bourne shell does source bash_completion.sh and how this happens ? Bash completion is not very usefull for other bourne shells due missing builtin functions like compgen

Mon Nov 17 12:46:11 UTC 2014 - werner@suse.de - Add patch PS1-completion-boo903362.patch to avoid trouble if restricted characters of the shell are used in PS1 like exclamation mark (boo#903362).

and I can reproduce this with bash 5.0.11 as well as with 5.1.12

boole:(/dev/pts/11) 497 : find ibash: fc: no command found

noether:(/dev/pts/13) 498 : find inbash: fc: no command found

Dirk Mueller (dirkmueller) - about 2 years ago

author source maintainer

iirc this was sourced via /etc/profile which for example dash or busybox-sh are sourcing on interactive shells. and the if condition is exactly checking whether it is a bash environment or not, but your patch was changing the if condition to use bash constructs, so it failed on anything other than bash, breaking the whole purpose of the if condition to begin with

Ah ... with latest bash 5.1.16

 noether:(/dev/pts/16) 27 : tail -n 2 ~/.bashrc 
 PS1="\h:($GPG_TTY) \! : "
 alias !='fc -e -'
 noether:(/dev/pts/16) 28 : echo $BASH_VERSION 
 5.1.16(1)-release
 noether:(/dev/pts/16) 29 : find installed-pkg/

then maybe change the line

Requires: bash

to

Requires: bash >= 5.1.16

@WernerFink, @pbleser, @poeml: review reminder