linux-kernel - Re: [PATCH bpf-next v2 4/5] bpftool: Update bash completion for "bpftool feature" command

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Date:   Fri, 21 Feb 2020 11:29:30 +0000
From:   Quentin Monnet <quentin@...valent.com>
To:     Michal Rostecki <mrostecki@...nsuse.org>, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 4/5] bpftool: Update bash completion for
 "bpftool feature" command

2020-02-21 04:16 UTC+0100 ~ Michal Rostecki <mrostecki@...nsuse.org>
> Update bash completion for "bpftool feature" command with the new
> argument: "full".
> 
> Signed-off-by: Michal Rostecki <mrostecki@...nsuse.org>
> ---
>   tools/bpf/bpftool/bash-completion/bpftool | 27 ++++++++++++++++-------
>   1 file changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool
> index 754d8395e451..f2bcc4bacee2 100644
> --- a/tools/bpf/bpftool/bash-completion/bpftool
> +++ b/tools/bpf/bpftool/bash-completion/bpftool
> @@ -981,14 +981,25 @@ _bpftool()
>           feature)
>               case $command in
>                   probe)
> -                    [[ $prev == "prefix" ]] && return 0
> -                    if _bpftool_search_list 'macros'; then
> -                        COMPREPLY+=( $( compgen -W 'prefix' -- "$cur" ) )
> -                    else
> -                        COMPREPLY+=( $( compgen -W 'macros' -- "$cur" ) )
> -                    fi
> -                    _bpftool_one_of_list 'kernel dev'
> -                    return 0
> +                    case $prev in
> +                        $command)
> +                            COMPREPLY+=( $( compgen -W 'kernel dev full macros' -- \
> +                                "$cur" ) )
> +                            return 0
> +                            ;;
> +                        prefix)
> +                            return 0
> +                            ;;
> +                        macros)
> +                            COMPREPLY+=( $( compgen -W 'prefix' -- "$cur" ) )
> +                            return 0

I have not tested, but I think because of the "return 0" this will 
propose only "prefix" after "macros". But "kernel" or "dev" should also 
be in the list.

Maybe just add "_bpftool_once_attr 'full'" under the 
"_bpftool_one_of_list 'kernel dev'" instead of changing to the "case 
$prev in" structure?

> +                            ;;
> +                        *)
> +                            _bpftool_one_of_list 'kernel dev'
> +                            _bpftool_once_attr 'full macros'
> +                            return 0
> +                            ;;
> +                    esac
>                       ;;
>                   *)
>                       [[ $prev == $object ]] && \
>