This file is indexed.

postinst is in nova-compute-kvm 2:14.0.0-4+deb9u1.

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

if [ "$1" = "configure" ]; then
	if dpkg-vendor --derives-from ubuntu ; then
		adduser --quiet nova libvirtd
	else
		adduser --quiet nova libvirt
	fi
fi