#!/bin/bash

# vars
VAR_LIST="HOSTNAME_MODE HOSTNAME_STRING HOSTNAME_IFACE LLXCFG_IFACE"
LLX_GETVAR="$(which llxcfg-showvars)"
LLX_NETFUNCS="/usr/share/lliurex/lliurex-netfuncs/lliurex-netfuncs.sh"
HOSTNAME_PATH="/etc/hostname"
HOSTS_PATH="/etc/hosts"
DNS_TIMEOUT=2

# Usage: exit_message message [exit_code]
exit_message() {
	local message="$1"
	local exit_code=${2:-0}
	if [ $exit_code -eq 0 ]; then
		echo -e "$message"
	else
   		echo -e "$message" >&2
	fi
	exit $exit_code
}

# Usage: set_hostname hostname
set_hostname(){
	local newhostname="$1"
	local curhostname="$(hostname)"
	if [ -z "$newhostname" ]; then return 1; fi
	echo $newhostname|skel-install "$HOSTNAME_PATH"
	sed "/^127.0.1.1[[:blank:]]/d" "$HOSTS_PATH"|skel-install "$HOSTS_PATH"
	hostname $newhostname
}

[ -x ${LLX_GETVAR} ] && eval `${LLX_GETVAR} ${VAR_LIST}`
[ "$HOSTNAME_IFACE" ] || HOSTNAME_IFACE="$LLXCFG_IFACE"
# some tests 
[ -f "$LLX_NETFUNCS" ] || exit 0

. "$LLX_NETFUNCS"

NEW_HOSTNAME=""
case $HOSTNAME_MODE in 
   FIXED)
	NEW_HOSTNAME="$HOSTNAME_STRING"
	;;
   DNS)
	if [ "$HOSTNAME_IFACE" ] ; then
		cur_ip=$(get_current_ip "$HOSTNAME_IFACE")
		if [ "$cur_ip" ] ; then
			res=0
			NEW_HOSTNAME="$(dig -x $cur_ip +short +time=$DNS_TIMEOUT |sed -e "s%\.$%%")" || res=$?
#			if [ $res -eq 0 -a "$NEW_HOSTNAME" ]; then
#				# remove from dot
#				NEW_HOSTNAME="${NEW_HOSTNAME%%.*}"
#			fi
		fi
	fi
	;;
esac
if [ "$NEW_HOSTNAME" ] ; then
	[ ! -r "$HOSTNAME_PATH" ] || curhostname=$(<$HOSTNAME_PATH)
	if [ "$NEW_HOSTNAME" != "$curhostname" ] ; then
		set_hostname "$NEW_HOSTNAME"
	fi
fi
   
exit 0