postinst is in activemq 5.15.3-2.
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  | #!/bin/sh
set -e
AMQ_HOME=/var/lib/activemq
AMQ_GROUP=activemq
AMQ_USER=activemq
create_group() {
    if ! getent group $AMQ_GROUP > /dev/null 2>&1; then
        addgroup --system $AMQ_GROUP
    fi
}
create_user() {
    if ! getent passwd $AMQ_USER > /dev/null 2>&1; then
        adduser --system --no-create-home --ingroup $AMQ_GROUP \
                --home $AMQ_HOME --shell /bin/bash $AMQ_USER
    else
        AMQ_HOME=`getent passwd $AMQ_USER | cut -f6 -d:`
        # Renable user (give him a shell)
        usermod --shell /bin/bash $AMQ_USER
    fi
}
if [ "$1" = "configure" ]; then
    create_group
    create_user
    # Use dpkg-statoverride instead of direct chmod/chown
    if ! dpkg-statoverride --list $AMQ_HOME >/dev/null 2>&1; then
        dpkg-statoverride --update --add $AMQ_USER root 755 $AMQ_HOME
    fi
fi
# Automatically added by dh_installinit/11.1.6ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if [ -x "/etc/init.d/activemq" ]; then
		update-rc.d activemq defaults >/dev/null
		if [ -n "$2" ]; then
			_dh_action=restart
		else
			_dh_action=start
		fi
		invoke-rc.d activemq $_dh_action || exit 1
	fi
fi
# End automatically added section
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