random host choice

install.sh

hostlist=("http://chef.rckspc.com" "http://s3.amazonaws.com")

# Get command line arguments
while getopts sarv: opt
do
  case "$opt" in
    v)  version="$OPTARG";;
    s)  use_shell=1;;
    a)  test -n "$host" && echo "Host already set to ${host}" || host="${hostlist[1]}";;
    r)  test -n "$host" && echo "Host already set to ${host}" || host="${hostlist[0]}";;
    \?)   # unknown flag
      echo >&2 \
      "usage: $0 [-s] [-v version] [-r|-a]"
      exit 1;;
  esac
done
shift `expr $OPTIND - 1`

index=$RANDOM
let "index %= ${#hostlist[@]}"
test -n "$host" || host=${hostlist[$index]}