#!/bin/sh

RESUME_DEVICE=$1

if [ -z "${RESUME_DEVICE}" ]; then
	echo "usage: $0 resume_device" >&2
	exit 1
fi

if [ -n "$2" ]; then
	TMP_FILE=$2;
else
	TMP_FILE="initrd"
fi
if [ -z "$RESUME" ]; then
	RESUME="resume"
fi
if [ -z "$INITRD_SIZE" ]; then
	INITRD_SIZE=2000k
fi
if [ -z "$CONFIG_FILE" ]; then
	CONFIG_FILE="conf/suspend.conf"
fi 
if [ -z "${MOUNT_POINT}" ]; then
	MOUNT_POINT="mnt"
	if [ ! -d "${MOUNT_POINT}" ]; then
		mkdir "${MOUNT_POINT}"
		if [ ! -d "${MOUNT_POINT}" ]; then
			echo "Could not create the mount point" >&2
			exit 1
		fi
		RMDIR_MOUNT_POINT="yes"
	else
		RMDIR_MOUNT_POINT=""
	fi
fi
if [ -z "$BOOT_DIR" ]; then
	BOOT_DIR="/boot"
fi
if [ -z "$INITRD_FILE" ]; then
	INITRD_FILE="$BOOT_DIR/resume-initrd"
fi

if [ -f "$RESUME" -a -d "${MOUNT_POINT}" -a -b "${RESUME_DEVICE}" ]; then
	dd if=/dev/zero of="$TMP_FILE" bs=$INITRD_SIZE count=1
	/sbin/mke2fs -F -m0 "$TMP_FILE"
	mount -t ext2 -o loop "$TMP_FILE" "${MOUNT_POINT}"
	if [ "$?" = "0" ]; then 
		mkdir "${MOUNT_POINT}"/dev
		cp -r /dev/console  "${MOUNT_POINT}"/dev/
		cp -r /dev/snapshot "${MOUNT_POINT}"/dev/
		cp -r /dev/random "${MOUNT_POINT}"/dev/
		cp -r /dev/urandom "${MOUNT_POINT}"/dev/
		cp -r "${RESUME_DEVICE}" "${MOUNT_POINT}"/dev/
		mkdir "${MOUNT_POINT}"/proc
		mkdir "${MOUNT_POINT}"/etc
		cp "$CONFIG_FILE" "${MOUNT_POINT}"/etc/
		cp "$RESUME" "${MOUNT_POINT}"/resume
		ln -s resume "${MOUNT_POINT}"/linuxrc
		umount "${MOUNT_POINT}"
		if [ -f "$INITRD_FILE" ]; then
			mv "$INITRD_FILE" "$INITRD_FILE".orig
		fi
		chmod 644 "$TMP_FILE"
		mv "$TMP_FILE" "$INITRD_FILE"
	else
		echo "Could not mount $TMP_FILE on ${MOUNT_POINT}" >&2
	fi
else
	echo "Could not install the resume initrd" >&2
fi

if [ -n "$RMDIR_MOUNT_POINT" ]; then
	rmdir "${MOUNT_POINT}"
fi