_overmask() {
    local i cur prev opts cmd
    COMPREPLY=()
    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
        cur="$2"
    else
        cur="${COMP_WORDS[COMP_CWORD]}"
    fi
    prev="$3"
    cmd=""
    opts=""

    for i in "${COMP_WORDS[@]:0:COMP_CWORD}"
    do
        case "${cmd},${i}" in
            ",$1")
                cmd="overmask"
                ;;
            overmask,a)
                cmd="overmask__subcmd__apply"
                ;;
            overmask,apply)
                cmd="overmask__subcmd__apply"
                ;;
            overmask,c)
                cmd="overmask__subcmd__clean"
                ;;
            overmask,clean)
                cmd="overmask__subcmd__clean"
                ;;
            overmask,d)
                cmd="overmask__subcmd__device"
                ;;
            overmask,dev)
                cmd="overmask__subcmd__device"
                ;;
            overmask,device)
                cmd="overmask__subcmd__device"
                ;;
            overmask,help)
                cmd="overmask__subcmd__help"
                ;;
            overmask__subcmd__help,apply)
                cmd="overmask__subcmd__help__subcmd__apply"
                ;;
            overmask__subcmd__help,clean)
                cmd="overmask__subcmd__help__subcmd__clean"
                ;;
            overmask__subcmd__help,device)
                cmd="overmask__subcmd__help__subcmd__device"
                ;;
            overmask__subcmd__help,help)
                cmd="overmask__subcmd__help__subcmd__help"
                ;;
            *)
                ;;
        esac
    done

    case "${cmd}" in
        overmask)
            opts="-s -o -m -b -i -h -V --seed-file --overlay-file --mask-file --block-size --ignore-errors --help --version apply a clean c device d dev help"
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                --seed-file)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -s)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                --overlay-file)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -o)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                --mask-file)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -m)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                --block-size)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -b)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
        overmask__subcmd__apply)
            opts="-h --force --help"
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
        overmask__subcmd__clean)
            opts="-t -h --truncate --help"
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
        overmask__subcmd__device)
            opts="-n -t -p -T -h --nbd-device --nbd-timeout --print-operations --trim-no-punch-holes --help"
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                --nbd-device)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -n)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                --nbd-timeout)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -t)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
        overmask__subcmd__help)
            opts="apply clean device help"
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
        overmask__subcmd__help__subcmd__apply)
            opts=""
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
        overmask__subcmd__help__subcmd__clean)
            opts=""
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
        overmask__subcmd__help__subcmd__device)
            opts=""
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
        overmask__subcmd__help__subcmd__help)
            opts=""
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
    esac
}

if [[ "${BASH_VERSINFO[0]}" -eq 4 && "${BASH_VERSINFO[1]}" -ge 4 || "${BASH_VERSINFO[0]}" -gt 4 ]]; then
    complete -F _overmask -o nosort -o bashdefault -o default overmask
else
    complete -F _overmask -o bashdefault -o default overmask
fi
