This file is indexed.

postinst is in quagga-core 1.1.1-3+deb9u2.

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/bash
set -eu

if [ "$1" = "configure" ]; then
  # Set permissions to allow quagga daemons and vtysh to write config files.
  dpkg-statoverride --list /etc/quagga || \
  dpkg-statoverride --add --update quagga quaggavty 775 /etc/quagga
fi

# remove symlinks to /etc/init.d/quagga from runlevels
update-rc.d -f quagga remove

# Automatically added by dh_systemd_enable
# This will only remove masks created by d-s-h on package removal.
deb-systemd-helper unmask zebra.service >/dev/null || true

# was-enabled defaults to true, so new installations run enable.
if deb-systemd-helper --quiet was-enabled zebra.service; then
	# Enables the unit on first installation, creates new
	# symlinks on upgrades if the unit file has changed.
	deb-systemd-helper enable zebra.service >/dev/null || true
else
	# Update the statefile to add new symlinks (if any), which need to be
	# cleaned up on purge. Also remove old symlinks.
	deb-systemd-helper update-state zebra.service >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_start
if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
	if [ -n "$2" ]; then
		_dh_action=try-restart
	else
		_dh_action=start
	fi
	deb-systemd-invoke $_dh_action zebra.service >/dev/null || true
fi
# End automatically added section