postinst is in exabgp 4.0.2-2.
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 49 50 51 52 53 | #!/bin/sh
set -e
CONFIGFILE="/etc/exabgp/exabgp.env"
TMPCONF="/etc/exabgp/exabgp.env.dpkg-tmp"
gen_env_config() {
    echo "Generating /etc/exabgp/exabgp.env."
    trap 'rm -f $TMPCONF' TERM INT EXIT QUIT
    exabgp --fi >> "$TMPCONF" 2>/dev/null
    sed -i "s#nobody#exabgp#" "$TMPCONF"
    ucf $TMPCONF $CONFIGFILE
    rm -f $TMPCONF
}
# Remove previous configuration files
if dpkg-maintscript-helper supports mv_conffile 2>/dev/null; then
    for f in processes/dynamic-1.sh processes/watchdog-1.sh processes/healthcheck.py; do
        if ! egrep -q "$f" /etc/exabgp/exabgp.conf 2> /dev/null ; then
            dpkg-maintscript-helper rm_conffile /etc/exabgp/"$f" -- "$@" ; fi
    done
    dpkg-maintscript-helper rm_conffile /etc/default/exabgp 3.4.9-0~ -- "$@"
    # exabgp.conf should stay here only if it was modified by the
    # user. If this is the case, we move it back at its previous
    # location.
    dpkg-maintscript-helper rm_conffile /etc/exabgp/exabgp.conf 3.4.9-0~ -- "$@"
    if [ -f "/etc/exabgp/exabgp.conf.dpkg-bak" -a ! -f "/etc/exabgp/exabgp.conf" ]; then
        echo "Move back exabgp.conf.dpkg-bak to exabgp.conf ..."
        mv /etc/exabgp/exabgp.conf.dpkg-bak /etc/exabgp/exabgp.conf
    fi
    if [ -d "/etc/exabgp/processes/" ] ; then rmdir /etc/exabgp/processes 2>/dev/null || true ; fi
fi
case "$1" in
configure)
    adduser --quiet --system --group --disabled-login --home /var/run/exabgp exabgp
    gen_env_config
    ;;
esac
# Automatically added by dh_installinit/11ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/exabgp" ]; then
		update-rc.d exabgp defaults >/dev/null
		invoke-rc.d exabgp start || exit $?
	fi
fi
# End automatically added section
exit 0
 |