File debian.preinst of Package tinyproxy

#!/bin/sh
# preinst script for netpolicetiny
#
# see: dh_installdeb(1)

set -e

# Prepare to move a conffile without triggering a dpkg question
prep_mv_conffile() {
    local PKGNAME="$1"
    local CONFFILE="$2"

    [ -e "$CONFFILE" ] || return 0

    local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
    local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PKGNAME | \
            sed -n -e "\' $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
    if [ "$md5sum" = "$old_md5sum" ]; then
        rm -f "$CONFFILE"
    fi
}

case "$1" in
install|upgrade)
    if dpkg --compare-versions "$2" le "1.6.3-3.3"; then
        prep_mv_conffile netpolicetiny "/etc/netpolicetiny/netpolicetiny.conf"
    fi
esac


if ! grep -q "^netpolice:" /etc/passwd
then
    useradd --system -d "/nonexistent" -c "NetPolice User" --user-group netpolice -s /bin/sh
fi

#DEBHELPER#