#!/bin/bash
#remaster lib
[ -d "<LIBDIR>" ] || { echo "LIBDIR not exist"; exit 1; }

#filesystem_extract [filesystem_img_source] [chroot_path]
function filesystem_extract() {
	echo "extract filesystem ..."

	#$1 = filesystem_img_source
	#$2 = chroot_path
	filesystem_img_source="$1"
	chroot_path="$2"
	filesystem_log="`mktemp`"

	#Überfrüfen der Parameter
	[ -f "$filesystem_img_source" ] || {
		echo "### ERROR ### filesystem_extract: squashfs \"$filesystem_img_source\" not exist!"
		return 11
	}

	[ "`mkdir -p "$chroot_path"`" != "" ] && {
		echo "### ERROR ### filesystem_extract: chroot_path \"$chroot_path\" can't create!"
		return 13
	}

	[ "`filesystem_get_type $chroot_path`" != "ext4" ] && [ "`filesystem_get_type $chroot_path`" != "btrfs" ] && {
		echo "### ERROR ### filesystem_extract: wrong filesystem (`filesystem_get_type $chroot_path`)!"
		return 22
	}

	rm -r "$chroot_path"

	#eigendliches entpacken
	unsquashfs -d "$chroot_path" "$filesystem_img_source" > "$filesystem_log" || {
		echo "### ERROR ### filesystem_extract: unsquashfs failed!"
		return 14
	}

	grep -v "\[" "$filesystem_log"
	rm "$filesystem_log"

	echo "done"
}

#this func is standalone executable
[ -n "$1" ] && {
  filesystem_extract $@
}