#!/bin/bash
# This code should not be run as `sh find_all_modules.sh`, as some distros
# link sh to dash, which is POSIX-compliant and doesn't do arrays.
# Adapted from Linux Kernel in a Nutshell: http://www.kroah.com/lkn/
# By Rob Sears, Sept 22, 2013.

# Get a newline-separated list of modules in use:
MODLIST=`for i in $(find /sys/ -name modalias -exec cat {} \; 2>/dev/null); do	/sbin/modprobe --config /dev/null --show-depends $i 2> /dev/null;done | rev | cut -f 1 -d '/' | rev | sort -u`

# Convert the newline-separated list to an array:
IFS=$'\n' read -d '' -r -a MODULES <<< "${MODLIST}"

# Iterate over the array and print out details:
for i in "${MODULES[@]}"
do
	# Get the module name (turn "module.ko" to "module"):
	MOD=`echo "${i}" | sed -e "s/\([0-9a-zA-Z]\)\.ko/\1/"`

	# Get the module description:
	DESC=`modinfo $MOD | grep description | sed -r "s/[\ ]+{2,}/\ /g; " | sed -e "s/^description\: \([0-9a-zA-Z]\)/\1/"`

	# Get the module's dependancies:
	DEPS=`modinfo $MOD | grep depends | sed -r "s/[\ ]+{2,}/\ /g; " | sed -e "s/^depends\: \([0-9a-zA-Z]\)/\1/"`

	# Determine whether to print a description:
	if [ -z "${DESC}" ]; then
		DESCRIPTION=""
	else
		DESCRIPTION="${DESC} "
	fi

	# Determine whether to print a dependancy list:
	if [[ "${DEPS}" =~ "depends:" ]]; then
		DEPENDANCIES=""
	else
		DEPENDANCIES="Depends on ${DEPS}"
	fi

	# Generate the notes to display:
	NOTES="${DESCRIPTION}${DEPENDANCIES}"
	if [ -z "${NOTES}" ]; then
		MESSAGE="$i: No information"
	else
		MESSAGE="$i (${NOTES})"
	fi

	# Print the module name, description and dependancies:
	echo "${MESSAGE}"
done