post_install() {
    for x in apt apt-get zypper dnf eopkg apk; do
        ln -s /usr/bin/pkg-warner /usr/bin/$x
        echo "linked to $x"
    done
}

post_upgrade() {
    post_install
}

post_remove() {
   for x in apt apt-get zypper dnf eopkg apk; do
        rm -f /usr/bin/$x
        echo "removed the link to $x"
    done 
}