This file is indexed.

preinst is in qmail-run 2.0.2+nmu1.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e

errcho () {
  echo "$*" >&2
}

if test "$1" = upgrade && dpkg --compare-versions "$2" lt 2.0.0; then
  errcho "Upgrading qmail-run from version $2 is not yet supported."
  errcho
  exit 1
fi