#!/bin/sh

set -e

argv0="$0"
argv1="$1"
argv2="$2"

FILE_NAME="image.img.gz"
COMPACT="gzip -c"
EXTRACT="gzip -cd"

usage() {
	printf "Usage: $argv0 {save,deploy} [device]

Examples:
	$argv0 save /dev/sda1  # images installation at /dev/sda1
	$argv0 deploy /dev/sda # deploys saved image to /dev/sda

In-program constants (edit this script to change them):
	\$FILE_NAME - where to save/read the image
	\$COMPACT - command to compact the image (such as \"gzip -c\" to
	            compress with gzip)
	\$EXTRACT - command to extract the image (such as \"gzip -cd\" to
	            extract gzip)\n"
	exit 1
}

[ -n "$argv2" ] || usage

set -x

case "$argv1" in
(save)   $COMPACT <"$argv2" >"$FILE_NAME" ;;
(deploy) $EXTRACT <"$FILE_NAME" >"$argv2" ;;
esac

exit 0