#!/bin/bash
# a script to find which nodes, defined in a cluster definition file
# cluster.txt are responding to ping
setglobal COUNT = '0'
if [[ ! -z "$1" ]] {
    setglobal WANTED = $1
}
if [[ -f cluster.txt ]] {

    # select which hosts to scan
    while read HOSTNAME MACADDR IPADDR ILOIPADDR DOMAIN ROLE {
	if [[ "$HOSTNAME" = end ]] {
	    continue
	}
	if [[ -z "$WANTED" || "$WANTED" = all || "$WANTED" = "$ROLE" || "$WANTED" = "IPADDR" || "$WANTED" = "$HOSTNAME" ]] {
	    setglobal ALLHOSTS = ""$ALLHOSTS $IPADDR""
	}
    } < cluster.txt

    if [[ -z "$ALLHOSTS" ]] { exit; }

    # fping is fast but might not be available
    if [[ -z `which fping` ]] {
        # use standard ping instead 
	for IP in [$ALLHOSTS] {
            setglobal UP = $[ping -c 1 $IP | grep ttl |cut -f4 -d" " | cut -f1 -d":]
            if [[ ! -z "$UP" ]] {
		setglobal COUNT = $shExpr('COUNT + 1')
		echo $UP $ROLE
            }
	}
    } else {
        # we can use fping
        setglobal UP = $[fping -aq $ALLHOSTS !2 > /dev/null]
        for H in [$UP] {
            setglobal COUNT = $shExpr('COUNT + 1')
            echo $H
        }
    }
    echo "$COUNT hosts up"
} else {
    echo "Warning : no cluster definition (cluster.txt) found"
}