mkrootfs

#!/bin/sh

# Copyright (C) 2014 NEO-Technologies
# Author: Julien Chauveau <julien.chauveau@neo-technologies.fr>

PROG=$(basename $0)

if [ $# != 2 ] || [ ! -d $1 ]; then
  cat << EOF
Usage: $PROG directory size

    directory   Directory used for the creation of the ext4 rootfs image
    size        Image size in 'dd' format (eg. 256M, 512M, 1G, etc.)
EOF
  exit 1
fi

ROOT=$(cd $1; pwd)
TEMP=$(tempfile)

echo "\n***** Creating $ROOT.img (size: $2) *****\n"

rm $TEMP && mkdir $TEMP
dd if=/dev/zero of=$ROOT.img bs=1 count=0 seek=$2
mkfs.ext4 -F -m 0 -L linuxroot $ROOT.img
sudo mount -o loop $ROOT.img $TEMP
sudo cp -a $ROOT/* $TEMP
sudo umount $TEMP
rmdir $TEMP