radish-pack-image

#!/bin/bash

if [ "`id -u`" != "0" ]
  then
    echo "This script can only run as root"
    exit 1
fi

if [ "${1}" = "" ]
 then
   echo "No argument, Usage: $0 <file>"
   exit 1
fi

check="true"
for ex in \
 echo pwd mktemp mount umount sed grep head partclone.ext4 resize2fs \
 fsck.ext4 bzip2
  do
    loc=`which "${ex}"`
    if [ "${loc}" = "" ]
      then
      echo "${ex} is missing"
      check="false"
    fi
  done

if [ "${check}" = "false" ]
  then
  echo "Some utilities are missing"
  exit 1
fi

set -e

unset LC_CTYPE LC_MESSAGES LC_ALL
export LANG=C

currdir=`pwd`
imagefile=`mount |grep -F "${currdir}" | grep -F "${1}" | \
  sed 's/ on .*$//' | head -n 1`
mountdir=`mount |grep -F "${currdir}" | grep -F "${1}" | \
  sed -e 's/^.* on //' -e 's/ type .*$//' | head -n 1`

echo "${imagefile}"
echo "${mountdir}"

if [ "${imagefile}" = "" -o "${mountdir}" = "" ]
  then
  echo "${1} is not mounted"
  exit 1
fi

umount "${imagefile}" || {
echo "${1} can not be unmounted"
exit 1
}

if mount | grep -F "${imagefile}"
  then
    echo "${imagefile} is still mounted"
    exit 1
fi

if mount | grep -F "${mountdir}"
  then
    echo "${mountdir} is still mounted"
    exit 1
fi

rmdir "${mountdir}"

echo "Shrinking filesystem image..."

fsck.ext4 -f "${imagefile}"
resize2fs -M "${imagefile}"

echo "Converting filesystem image into compressed partclone format..."

partclone.ext4 -c -s "${imagefile}" -o - | bzip2 -9 -c > root-image.bin
rm "${imagefile}"

echo "Image is ready."