postinst is in resiprocate-turn-server 1:1.10.1-2ubuntu1.
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 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | #!/bin/sh
set -e
# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
dpkg-maintscript-helper mv_conffile \
  /etc/reTurnServer.config /etc/reTurn/reTurnServer.config 1.9.0~beta10-1 -- "$@"
dpkg-maintscript-helper mv_conffile \
  /etc/reTurnServer-users.txt /etc/reTurn/users.txt 1.9.0~beta10-1 -- "$@"
sed -i -e 's!^UserDatabaseFile = /etc/reTurnServer-users.txt!UserDatabaseFile = /etc/reTurn/users.txt!' /etc/reTurn/reTurnServer.config
sed -i -e 's!^TlsTempDhFilename = /etc/reTurnServer-dh2048.pem!TlsTempDhFilename = /etc/reTurn/dh2048.pem!' /etc/reTurn/reTurnServer.config
# $1 = version of the package being upgraded.
install() {
    RETURN_GROUP=return
    if ! getent group "$RETURN_GROUP" >/dev/null; then
        addgroup --system "$RETURN_GROUP" || exit 1
    fi
    RETURN_USER=return
    if ! getent passwd "$RETURN_USER" >/dev/null; then
        adduser --system \
           --home / \
           --shell /bin/false \
           --no-create-home \
           --ingroup "$RETURN_GROUP" \
           --disabled-password \
           --disabled-login \
           --gecos "reTurnServer daemon" \
               "$RETURN_USER" || exit 1
    fi
    DH_PARAM_FILE=/etc/reTurn/dh2048.pem
    if [ ! -e ${DH_PARAM_FILE} ];
    then
        /usr/bin/openssl dhparam -outform PEM -out ${DH_PARAM_FILE} 2048
        chown root:${RETURN_GROUP} ${DH_PARAM_FILE}
        chmod 0640 ${DH_PARAM_FILE}
    fi
    chown ${RETURN_USER}:${RETURN_GROUP} /var/log/reTurnServer
    chmod 0750 /var/log/reTurnServer
}
case "$1" in
    configure)
        install "$2"
        ;;
    abort-upgrade|abort-remove|abort-deconfigure)
        ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
        ;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
# Automatically added by dh_installinit
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/resiprocate-turn-server" ]; then
		update-rc.d resiprocate-turn-server defaults >/dev/null
	fi
	if [ -x "/etc/init.d/resiprocate-turn-server" ] || [ -e "/etc/init/resiprocate-turn-server.conf" ]; then
		invoke-rc.d resiprocate-turn-server start || exit $?
	fi
fi
# End automatically added section
exit 0
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