Script to clean old /usr/lib/modules directories in Fedora Work Station.

kernel-cleaner.sh

#! /bin/bash

## ONLY DEDICATED TO FEDORA WORK STATION.
## For an unknown reason as far as I know, Fedora kernels update doesn't
## remove the very old /lib/modules dir from system and then, cumulate
## numbers of modules kernel folders.
## This very small script install it self as a boot service and check
## if the the kernels in /boot directory are the only present in /lib/modules,
## then, clean if needed.
##
## The command had to be run only once :
## sudo kernel-cleaner.sh
##
## Remove is done manually from /lib/systemd/system/.

# set -e

if [ ! -f /lib/systemd/system/obsolete-kernels-cleaner.service ]; then
	cat <<-SYS > /lib/systemd/system/obsolete-kernels-cleaner.service
		[Unit]
		Description=Obsolete KERNEL modules directory removal
		Wants=syslog.target

		[Service]
		Type=forking
		ExecStart=/usr/local/sbin/kernel-cleaner.sh

		[Install]
		WantedBy=multi-user.target
	SYS
	systemctl daemon-reload
	systemctl enable obsolete-kernels-cleaner.service
else
	echo "Checking not auto removed modules kernel directories."
	available_kernels=$(rpm -q --queryformat "%{VERSION}-%{RELEASE}\n" kernel-core)
	removable_kernels=$(ls -1 /usr/lib/modules/| grep -v "${available_kernels[*]}")

	if [ ${#removable_kernels[*]} -gt 0 ]; then
		for modules_dir in ${removable_kernels[@]}; do
			[ -d /usr/lib/modules/$modules_dir ] && { rm -rf /usr/lib/modules/$modules_dir
			echo "Removed $modules_dir from /usr/lib/modules."
			}
		done
	else
		echo "/usr/lib/modules report clean status."
	fi
	unset available_kernels removable_kernels
fi