#!/bin/bash
set -e

if ! docker inspect busybox &> /dev/null; then
	hardCodedDir='/docker-busybox'
	if [ -d "$hardCodedDir" ]; then
		( set -x; tar -cC "$hardCodedDir" . | docker load )
	elif [ -e Dockerfile ] && command -v curl > /dev/null; then
		# testing for "curl" because "download-frozen-image.sh" is built around curl
		dir="$DEST/busybox"
		# extract the exact "download-frozen-image.sh" line from the Dockerfile itself for consistency
		awk '$1 == "RUN" && $2 == "./contrib/download-frozen-image.sh" && /busybox@/ {
			for (i = 2; i < NF; i++)
				printf ( $i == "'"$hardCodedDir"'" ? "'"$dir"'" : $i ) " ";
			print $NF;
		}' Dockerfile | sh -x
		( set -x; tar -cC "$dir" . | docker load )
	else
		( set -x; docker pull busybox )
	fi
fi