#!/bin/sh

usage() {
    cat >&2 <<EOF && :
usage: `basename "$0"` [-n <retries>] [cmd...]
EOF
    exit 1
}

n=3
while [ $# -gt 0 ]; do
    case $1 in
        --)
            shift
            break;;
        -n)
            shift
            n=${1-}
            if [ $# -eq 0 ]; then
                usage
            fi
            shift;;
        -*)
            usage;;
        *)
            break;;
    esac
done

i=1
while :; do
    if "$@"; then
        exit
    else
        e=$?
        cmd=$@
        i=`expr $i + 1` || exit
        if [ $i -le "$n" ]; then
            cat >&2 <<EOF && :

command exited with $e: $cmd
retrying ($i/$n) ...

EOF
        else
            exit $e
        fi
    fi
done