postinst is in heat-common 2014.1-0ubuntu1.
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.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #!/bin/sh
set -e
if [ "$1" = "configure" ] ; then
    if ! getenv group heat > /dev/null 2>&1; then
        addgroup --system heat >/dev/null
    fi
    if ! getenv passwd heat > /dev/null 2>&1; then
        adduser --system --home /var/lib/heat --ingroup heat --no-create-home \
            --shell /bin/false heat
    fi
	chown -R heat:adm /var/log/heat
	mkdir -p /etc/heat
	chmod 0750 /var/log/heat /etc/heat
	mkdir -p /var/lib/heat
	chown heat:heat -R /var/lib/heat /etc/heat
fi
exit 0
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