#!/bin/sh

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 = $needle ]] && return 0 # Found
	done
	return 1 # Not Found
}
find . -type f -name \*.so\* | while read filename
do
	# check if we really have a shared object
	if LC_ALL=C readelf -h "$filename" 2>/dev/null | grep -q '.*Type:.*DYN (Shared object file).*'; then
		# 64
		soarch=$(LC_ALL=C readelf -h "$filename" | sed -n 's/.*Class.*ELF\(32\|64\)/\1/p')
		# get the string binaries link to: libfoo.so.1.2 -> libfoo.so.1
		sofile=$(LC_ALL=C readelf -d "$filename" 2>/dev/null | sed -n 's/.*Library soname: \[\(.*\)\].*/\1/p')
		[ -z "$sofile" ] && sofile="${filename##*/}"

		# extract the library name: libfoo.so
		soname="${sofile%%\.so\.*}.so"
		# extract the major version: 1
		soversion="${sofile##*\.so\.}"
		if ! in_array "${soname}=${soversion}-${soarch}" ${soprovides[@]}; then
			# libfoo.so=1-64
			echo "${soname}=${soversion}-${soarch}"
			soprovides=(${soprovides[@]} "${soname}=${soversion}-${soarch}")
		fi
	fi
done