postinst is in tarantool-lts-common 1.5.5-18-g2998d20-1ubuntu1.
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  | #!/bin/sh
set -e
SYSUSER=tarantool
case "$1" in
    configure)
        if ! getent passwd $SYSUSER > /dev/null; then
            adduser \
                --system \
                --group \
                --quiet \
                --home \
                /var/spool/$SYSUSER \
                --no-create-home \
                --disabled-login \
                    tarantool
        fi
        install -d -o$SYSUSER -gadm -m2750 /var/log/tarantool
        install -d -o$SYSUSER -g$SYSUSER -m750 /var/run/tarantool
        install -d -o$SYSUSER -g$SYSUSER -m750 /var/lib/tarantool/started
        install -d -o$SYSUSER -g$SYSUSER -m750 /var/lib/tarantool/snapshot
    ;;
esac
# Automatically added by dh_installinit
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/tarantool-lts" ]; then
		update-rc.d tarantool-lts defaults >/dev/null
	fi
	if [ -x "/etc/init.d/tarantool-lts" ] || [ -e "/etc/init/tarantool-lts.conf" ]; then
		invoke-rc.d tarantool-lts start || exit $?
	fi
fi
# End automatically added section
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