#!/bin/bash
# --- T2-COPYRIGHT-BEGIN ---
# t2/misc/target/initrd.in
# Copyright (C) 2004 - 2026 The T2 SDE Project
# SPDX-License-Identifier: GPL-2.0
# --- T2-COPYRIGHT-END ---

# extend_initrd initrd-filename from-dir
# adds additional content to an existing initrd (cpio image)
extend_initrd() {
	local initrd=$1
	local from=$2

	echo "Extending initrd archive ..."
	echo "Initrd: ${initrd/$build_root/\$root}"
	echo "  from: ${from/$build_root/\$root}"

	(
	  # extract archive
	  rm -rf $initrd.dir;  mkdir $initrd.dir
	  cd $initrd.dir

	  zstd -d -c $initrd | cpio -i

	  # copy extensions
	  cd $from
	  cp -a . $initrd.dir
	
	  # create archive
	  cd $initrd.dir
	  find . | cpio -o -H newc | zstd -19 -T0 > $initrd
	)

	# cleanup
	rm -rf $initrd.dir
}