#!/bin/sh
set -e



# This code was taken from nss-mdns:

log() {
    echo "$*"
}

# try to insert gw_name entries to the "hosts" line in /etc/nsswitch.conf to
# automatically enable libnss-gw-name support; do not change the configuration if the
# "hosts" line already references some gw_name lookups
insert_nss_entry() {
    log "Checking NSS setup..."
    # abort if /etc/nsswitch.conf does not exist
    if ! [ -e /etc/nsswitch.conf ]; then
        log "Could not find /etc/nsswitch.conf."
        return
    fi
    perl -i -pe '
        sub insert {
            # this also splits on tab
            my @bits=split(" ", shift);
            # do not break configuration if the "hosts" line already references
            # gw_name
            if (grep { $_ eq "gw_name"} @bits) {
                return join " ", @bits;
            }
            # change "files" into "files gw_name"
            return join " ", map {
                $_ eq "files" ? ("$_","gw_name") : $_
            } @bits;
        }
        s/^(hosts:\s+)(.*)/$1.insert($2)/e;
    ' /etc/nsswitch.conf
}

action="$1"

if [ configure = "$action" ]; then
    if [ -z "$2" ]; then
        log "First installation detected..."
        # first install: setup the recommended configuration (unless
        # nsswitch.conf already contains gw_name entries)
        insert_nss_entry
    else
        # upgrade
        version="$2"
	
	# Nothing to do here yet
    fi
fi