This file is indexed.

postinst is in dpkg 1.19.0.5ubuntu2.

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
# See deb-postinst(5).

set -e

# Create the database files if they don't already exist
create_database() {
    admindir=${DPKG_ADMINDIR:-/var/lib/dpkg}

    for file in diversions statoverride status; do
	if [ ! -f "$admindir/$file" ]; then
	    touch "$admindir/$file"
	fi
    done
}


# Create log file and set default permissions if possible
create_logfile() {
    logfile=$DPKG_ROOT/var/log/dpkg.log
    touch $logfile
    chmod 644 $logfile
    chown root:root $logfile 2>/dev/null || chown 0:0 $logfile
}


case "$1" in
    configure)
	create_database
	create_logfile
	;;

    abort-upgrade|abort-deconfigure|abort-remove)
	;;

    *)
	echo "$0 called with unknown argument '$1'" 1>&2
	exit 1
	;;
esac


exit 0