#!/bin/sh -e

img_url="http://maas.ubuntu.com/images/ephemeral-v2/daily/trusty/armhf/20140618.1/root-image.gz"
img_gz="/tmp/root-image.gz"
img="/tmp/root-image"
u_boot_files="
  /usr/bin/mkimage /usr/bin/fw_printenv
  /usr/share/doc/u-boot-tools/changelog.Debian.gz 
  /usr/share/man/man1/mkimage.1.gz /usr/bin/fw_setenv
"

if [ ! -f "$img" ]; then
   if [ ! -f "$img_gz" ]; then
       wget "$img_url" -O "$img_gz.tmp" && mv "$img_gz.tmp" "$img_gz"
   fi
   zcat "$img_gz" > "$img.tmp" && mv "$img.tmp" "$img"
fi

sudo mount-image-callback "$img" -- sh -c \
   'cd $MOUNTPOINT && for f in "$@"; do ls -l ./${f#/}; done' -- \
   $u_boot_files