#!/bin/bash

if [[ -z $1 ]]; then
  echo "$(basename "$0") <package file>"
  exit 1
fi

tmpdir=$(mktemp -d /tmp/find-sodeps.XXXXXXX)
trap "rm -rf '$tmpdir'" EXIT INT TERM

tar -C $tmpdir -xf "$1"

cd $tmpdir

in_array() {
	local needle=$1; shift
	[[ -z $1 ]] && return 1 # Not Found
	local item
	for item in "$@"; do
	[[ $item = $needle ]] && return 0 # Found
	done
	return 1 # Not Found
}

find . -type f -perm -u+x | while read filename; do
	# get architecture of the file; if soarch is empty it's not an ELF binary
	soarch=$(LC_ALL=C readelf -h "$filename" 2>/dev/null | sed -n 's/.*Class.*ELF\(32\|64\)/\1/p')
	[ -n "$soarch" ] || continue
	# process all libraries needed by the binary
	for sofile in $(LC_ALL=C readelf -d "$filename" 2>/dev/null | sed -nr 's/.*Shared library: \[(.*)\].*/\1/p')
	do
		# extract the library name: libfoo.so
		soname="${sofile%%\.so\.*}.so"
		# extract the major version: 1
		soversion="${sofile##*\.so\.}"
		if ! in_array "${soname}=${soversion}-${soarch}" ${sodepends[@]}; then
			# libfoo.so=1-64
			echo "${soname}=${soversion}-${soarch}"
			sodepends=(${sodepends[@]} "${soname}=${soversion}-${soarch}")
		fi
	done
done