This file is indexed.

postinst is in qgis-providers-common 2.18.17+dfsg-1.

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" ] && [ -x /usr/lib/qgis/crssync ]; then
	cp /usr/share/qgis/resources/srs-template.db /usr/share/qgis/resources/srs.db
	dpkg-trigger qgis-crssync
fi