post_upgrade() {
  pkgver=$1
  _majorver=${pkgver%.*}
  # Prints the warning message if the database version on disk
  # does not match the PostgreSQL major version.
  if [ -d /var/lib/postgres/data$_majorver ]; then
	  /opt/postgresql$_majorver/bin/postgresql-check-db-dir /var/lib/postgres/data$_majorver || true
  fi
}
