_machine()
{
    local cur prev opts base
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"

    if [[ ${prev} == 'machine-json' ]]; then
        machines=$(zoneadm list -cp | grep -v ':global:' | cut -d':' -f2,5 | tr ':' '\n' | sort | uniq)
        COMPREPLY=( $(compgen -W "${machines}" -- ${cur}) )
    else
        # Just expand files by default
        COMPREPLY=( $(compgen -f -- ${cur}) )
    fi

    return 0
}

complete -F _machine machine-json