post_install() {
  [ -x /usr/bin/update-desktop-database ] && /usr/bin/update-desktop-database > /dev/null 2>&1
}

post_upgrade() {
  post_install $1 
}

post_remove () {
  [ -x /usr/bin/update-desktop-database ] && /usr/bin/update-desktop-database > /dev/null 2>&1
}

op=$1
shift

$op $*