post_install() {
  cat << EOF

NOTE
----
Happy blending!

EOF
  echo "update desktop mime database..."
  update-desktop-database
}

post_upgrade() {
  post_install $1
}

pre_remove() {
  /bin/true
}

post_remove() {
  echo "update desktop mime database..."
  update-desktop-database
}

op=$1
shift

$op $*