#!/bin/sh

IMG=$1

set -e

if ! [ $# -eq 1 ]; then
	echo "usage $0 <img_file_name>"
	exit 1
fi


if ! [ -f $IMG ]; then
	echo $IMG does not exist 
	exit 1
fi	
ls -als $IMG
mount -o loop $IMG mnt || exit 1
INSTALLDIR=`pwd`/mnt/
rm -f $INSTALLDIR/var/lib/rpm/__db.00* $INSTALLDIR/var/lib/rpm/.rpm.lock
yum -c $PWD/yum.conf clean packages --installroot=$INSTALLDIR

# Make sure that rpm database has right format (for rpm version in template, not host)
echo "--> Rebuilding rpm database..."
chroot `pwd`/mnt /bin/rpm --rebuilddb 2> /dev/null

echo "--> Compacting image file..."
dd if=/dev/zero of=mnt/fillme bs=1M 2> /dev/null || true
sync
rm mnt/fillme
umount mnt
cp --sparse=always $IMG $IMG.new
mv  $IMG.new $IMG
ls -als $IMG