#!/bin/sh
# preinst — shared by the twiy and twiy-raweb packages.
#
# Older releases shipped /nginx as dpkg-tracked files. When upgrading from one
# of those, dpkg deletes the old /nginx/* files during unpack (they are no
# longer part of the package) BEFORE postinst runs. Stash a copy of the live
# config tree first so postinst can restore any admin-edited config and it
# survives the migration. Never touched on a fresh install.

set -e

if [ "$1" = upgrade ] && [ -d /nginx ]; then
    rm -rf /var/backups/twiy-nginx
    mkdir -p /var/backups
    cp -a /nginx /var/backups/twiy-nginx
fi

exit 0