#!/bin/bash
############################################################################
#                                                                          #
# This file is part of the IPFire Firewall.                                #
#                                                                          #
# IPFire 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 2 of the License, or        #
# (at your option) any later version.                                      #
#                                                                          #
# IPFire 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 IPFire; if not, write to the Free Software                    #
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA #
#                                                                          #
# Copyright (C) 2020 IPFire Team <info@ipfire.org>.                        #
#                                                                          #
############################################################################

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
			# 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 $?