This file is indexed.

postinst is in nova-compute-libvirt 2:13.0.0-0ubuntu2.

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 -e

if [ "$1" = "configure" ]; then
    if ! getent group libvirtd | grep -qE '\<nova\>'
    then
        adduser nova libvirtd
    fi
fi