#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2007-2022  IPFire Team  <info@ipfire.org>                     #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
# GNU General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

PATHS=(
	/usr/lib
	/lib
)

main() {
	local dry_run="false"

	while [ $# -gt 0 ]; do
		case "${1}" in
			--dry-run)
				dry_run="true"
				;;

			*)
				echo "${0}: Invalid argument: ${1}" >&2
				return 2
				;;
		esac
		shift
	done

	# Update the runtime linker cache (this may fix any broken symlinks)
	ldconfig

	local path
	for path in ${PATHS[@]}; do
		echo "Searching in ${path}..."

		# Find all files called libsomething.so.N
		local lib
		for lib in $(find "${path}" -maxdepth 1 -type l -name "lib*.so.*" | sort); do
			# Ignore some libraries
			case "${lib}" in
				*/libboost*)
					continue
					;;
			esac

			# Read the name of the linked library
			local link="$(readlink -m "${lib}")"

			# We have two versioning schemas that we need to distinguish...
			local files=()
			case "${link}" in
				# Libraries called libsomething-N.so
				*/lib*-*.so)
					files+=( ${link%-*}-* )
					;;

				# Libraries called libsomething.so.N.*
				*)
					files+=( ${lib}* )
					;;
			esac

			# Remove all files that have the same base name than
			# the library we are looking at, apart from the symlink
			# and the linked file itself.
			local file
			for file in ${files[@]}; do
				case "${file}" in
					# Ignore these files
					${lib}|${link})
						;;

					*)
						echo "Removing ${file}..."

						# Actually remove the file (maybe)
						if [ "${dry_run}" = "false" ]; then
							unlink "${file}"
						fi
						;;
				esac
			done
		done
	done
}

main "$@" || exit $?