image-compare

#!/bin/bash

trap '{ stty sane; echo ""; errexit "Aborted"; }' SIGINT SIGTERM

MNTPATH="/tmp/img-compare-mnt"

mkloop()
{
  LOOP="$(losetup -f --show -P "${IMGFILE}")"
  if [ $? -ne 0 ]; then
    errexit "Unable to create loop device"
  fi
}

rmloop()
{
  if [ "${LOOP}" != "" ]; then
    losetup -d "${LOOP}"
    LOOP="" 
 fi
}

mntimg()
{
  MNTED=TRUE
  mkloop
  if [ ! -d "${MNTPATH}/" ]; then
    mkdir "${MNTPATH}/"
    if [ $? -ne 0 ]; then
      errexit "Unable to make ROOT partition mount point"
    fi
  fi
  mount "${LOOP}p2" "${MNTPATH}/"
  if [ $? -ne 0 ]; then
    errexit "Unable to mount image ROOT partition"
  fi
  if [ ! -d "${MNTPATH}/boot/" ]; then
    mkdir -p "${MNTPATH}/boot/"
    if [ $? -ne 0 ]; then
      errexit "Unable to make BOOT partition mount point"
    fi
  fi
  mount "${LOOP}p1" "${MNTPATH}/boot/"
  if [ $? -ne 0 ]; then
    errexit "Unable to mount image BOOT partition"
  fi
}

umntimg()
{
  umount "${MNTPATH}/boot/"
  if [ $? -ne 0 ]; then
    errexit "Unable to unmount image BOOT partition"
  fi
  umount "${MNTPATH}/"
  if [ $? -ne 0 ]; then
    errexit "Unable to unmount image ROOT partition"
  fi
  rmloop
  rm -r "${MNTPATH}/"
  MNTED=FALSE
}

errexit()
{
  echo ""
  echo "$1"
  echo ""
  if [ "${MNTED}" = "TRUE" ]; then
    umount "${MNTPATH}/boot/" &> /dev/null
    umount "${MNTPATH}/" &> /dev/null
    rm -rf "${MNTPATH}/" &> /dev/null
  fi
  rmloop
  exit 1
}

LOOP=""
MNTED=FALSE
if [ $(id -u) -ne 0 ]; then
  errexit "$0 must be run as root user"
fi
PGMNAME="$(basename $0)"
for PID in $(pidof -x -o %PPID "${PGMNAME}"); do
  if [ ${PID} -ne $$ ]; then
    errexit "${PGMNAME} is already running"
  fi
done
rsync --version &> /dev/null
if [ $? -ne 0 ]; then
  errexit "rsync not installed (run: apt-get install rsync)"
fi
IMGFILE="$1"
FLAG=0
while :
do
  if [[ ${FLAG} -eq 1 || "${IMGFILE}" = "" ]]; then
    while :
    do
      echo ""
      read -r -e -i "${IMGFILE}" -p "Image file to compare? " IMGFILE
      if [ "${IMGFILE}" = "" ]; then
        continue
      elif [ -d "${IMGFILE}" ]; then
        echo ""
        echo "${IMGFILE} is a directory"
        continue
      else
        break
      fi
    done
  fi
  if [ -f "${IMGFILE}" ]; then
    break
  else
    echo ""
    echo "${IMGFILE} not found"
    FLAG=1
  fi
done
mntimg
sync
echo ""
rsync -aDH --dry-run --itemize-changes --partial --numeric-ids --delete --force --exclude "${MNTPATH}" --exclude '/dev' --exclude '/lost+found' --exclude '/media' --exclude '/mnt' \
--exclude '/proc' --exclude '/run' --exclude '/sys' --exclude '/tmp' --exclude '/var/swap' --exclude '/etc/udev/rules.d/70-persistent-net.rules' \
--exclude '/var/lib/asterisk/astdb.sqlite3-journal' / "${MNTPATH}/"
if [ $? -ne 0 ]; then
  errexit "Unable to compare backup"
fi
echo ""
sync
umntimg