#!/bin/sh

set -e

# Starting from version 2.0+dfsg1-1, BOOTSTRAP_DIR has been replaced with a
# symlink. Because dpkg will not replace a directory with a symlink, we need to
# do that by hand.
# If we are dowgrading to a version that did not have the symlink we need to
# remove the symlink, otherwise dpkg will follow it when unpacking the package
# with the old version.

BOOTSTRAP_DIR=/usr/share/ntopng/httpdocs/bootstrap
BOOTSTRAP_OLD_DIR=${BOOTSTRAP_DIR}.dpkg-old

if [ "$1" = "upgrade" -a -L $BOOTSTRAP_DIR ] \
        && dpkg --compare-versions "$2" lt "2.0+dfsg1-1~"; then
    rm $BOOTSTRAP_DIR
    # If we have a backup, let's restore it.
    if [ -d $BOOTSTRAP_OLD_DIR ]; then
        echo rename dir
        mv $BOOTSTRAP_OLD_DIR $BOOTSTRAP_DIR
    fi
fi