#
# generate initramfs of directory
# usage:
#	generate_initramfs <source_dir> <files> <destination_dir/filename>
# example:
#	generate_initramfs "./server/boot/stage32_sqfs" "./mnt/openslx.sqfs" "./server/boot/initramfs2"
#	generate_initramfs "./server/build/stage31" "." "./server/boot/initramfs"
generate_initramfs() {
	[ $# -ne 3 ] && perror "Sanity check failed: generate_initramfs needs exactly two params, but $# were given."
	cd "$1" || perror "Cannot cd to '$1'"
	rm -f -- "$3"

	find $2 | cpio --format="newc" --create | xz --check=crc32 --lzma2=dict=1MiB > "$3"
	local PS=(${PIPESTATUS[*]})
	[ "x${PS[0]}" != "x0" ] && perror "'find $2' in '$(pwd)' failed."
	[ "x${PS[1]}" != "x0" ] && perror "cpio create failed."
	[ "x${PS[2]}" != "x0" ] && perror "gzip to '$3' failed."
	cd - > /dev/null
	pinfo "Created initramfs of $1 at $3"
	pinfo "Size: $(du -bsh "$3" | awk 'END {print $1}')"
}

# generates squashfs of directory
# usage:
#	generate_squashfs <source_dir> <destination_dir/filename>
generate_squashfs() {
	[ $# -ne 2 ] && perror "Sanity check failed: generate_squashfs needs exactly two params, but $# were given."
	[ -d "$1" ] || perror "$1 is not a directory."
	rm -f -- "$2"
	mksquashfs "$1" "$2" -comp xz -b 1M -no-recovery >&6 \
		|| perror "mksquashfs failed ($?)."
	pinfo "Created squashfs of $1 at $2"
	pinfo "Size: $(du -bsh "$2" | awk 'END {print $1}')"
}