postinst is in zabbix-java-gateway 1:3.0.12+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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56  | #!/bin/sh
set -e
# If /tmp/ZABBIX_PACKAGE_DEBUG file exists then enable debugging of this script.
#if [ -e /tmp/ZABBIX_PACKAGE_DEBUG ]; then
#    set -x
#fi
if [ "$1" = "configure" ]; then
    # Does the user 'zabbix' exist?
    if ! getent passwd zabbix > /dev/null 2>&1 ; then
        # Not yet. Create it.
        adduser --quiet --system --group --disabled-login --no-create-home --home /nonexistent zabbix
    fi
    chown zabbix:zabbix /var/log/zabbix-java-gateway -R
fi
# Automatically added by dh_systemd_enable/10.10.5ubuntu1
# This will only remove masks created by d-s-h on package removal.
deb-systemd-helper unmask 'zabbix-java-gateway.service' >/dev/null || true
# was-enabled defaults to true, so new installations run enable.
if deb-systemd-helper --quiet was-enabled 'zabbix-java-gateway.service'; then
	# Enables the unit on first installation, creates new
	# symlinks on upgrades if the unit file has changed.
	deb-systemd-helper enable 'zabbix-java-gateway.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 'zabbix-java-gateway.service' >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit/10.10.5ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	# In case this system is running systemd, we need to ensure that all
	# necessary tmpfiles (if any) are created before starting.
	if [ -d /run/systemd/system ] ; then
		systemd-tmpfiles --create /usr/lib/tmpfiles.d/zabbix-java-gateway.conf >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installinit/10.10.5ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/zabbix-java-gateway" ]; then
		update-rc.d zabbix-java-gateway defaults >/dev/null
		if [ -n "$2" ]; then
			_dh_action=restart
		else
			_dh_action=start
		fi
		invoke-rc.d zabbix-java-gateway $_dh_action || exit $?
	fi
fi
# End automatically added section
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