Fixed Alpine Linux installed package detection

[hmrodrigues]

apk search lists all packages that have ${package} on the name and that aren't installed

Example for rsh (not installed)

$ apk search rsh 2> /dev/null | grep rsh
abseil-cpp-flags-marshalling-20230802.1-r0
harsh-0.8.30-r0
powershell-7.3.9-r0
starship-1.16.0-r0
starship-bash-completion-1.16.0-r0
starship-fish-completion-1.16.0-r0
starship-zsh-completion-1.16.0-r0
starship-zsh-plugin-1.16.0-r0
$

$ apk list --installed rsh 2> /dev/null | grep rsh
$

Example for busybox (installed)

$ apk search busybox 2> /dev/null | grep busybox
busybox-1.36.1-r15
busybox-binsh-1.36.1-r15
busybox-doc-1.36.1-r15
busybox-extras-1.36.1-r15
busybox-extras-openrc-1.36.1-r15
busybox-ifupdown-1.36.1-r15
busybox-mdev-openrc-1.36.1-r15
busybox-openrc-1.36.1-r15
busybox-static-1.36.1-r15
busybox-suid-1.36.1-r15
$

$ apk list --installed busybox 2> /dev/null | grep busybox
busybox-1.36.1-r15 x86_64 {busybox} (GPL-2.0-only) [installed]
$

grep is still needed since apk list always returns 0

[mboelen]

Thanks, merged!

Output looks indeed better with your change. Sorry it took so long to merge.