This file is indexed.

postinst is in libnginx-mod-http-cache-purge 1.14.0-0ubuntu1.

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
# Automatically added by dh_nginx/UNDECLARED
for confpair in mod-http-cache-purge.conf:50-mod-http-cache-purge.conf  ; do
	from=$(echo $confpair | cut -d: -f1)
	to=$(echo $confpair | cut -d: -f2)

	if [ -L /etc/nginx/modules-enabled/$to.removed ]; then
		rm /etc/nginx/modules-enabled/$to.removed
		removed_link=true
	else
		removed_link=false
	fi

	# Symlink on
	# 1) Fresh installations
	# 2) Reinstalls after automatic removes (preserve admin actions)
	if [ -z "$2" -o "$removed_link" = "true" ]; then
		ln -sf /usr/share/nginx/modules-available/$from \
			/etc/nginx/modules-enabled/$to
	fi
done

if [ "$1" = "configure" ] ; then
	if which dpkg-trigger >/dev/null 2>&1 ; then
		dpkg-trigger --no-await nginx-reload
	fi

fi
# End automatically added section