netdev - Re: [PATCH bpf-next] bpftool: auto-complete BTF IDs for btf dump

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Date:   Sat, 25 May 2019 17:00:19 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Quentin Monnet <quentin.monnet@...ronome.com>
Cc:     Andrii Nakryiko <andriin@...com>, Kernel Team <kernel-team@...com>,
        Networking <netdev@...r.kernel.org>, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf-next] bpftool: auto-complete BTF IDs for btf dump

On Sat, May 25, 2019 at 4:55 AM Quentin Monnet
<quentin.monnet@...ronome.com> wrote:
>
> 2019-05-24 22:38 UTC-0700 ~ Andrii Nakryiko <andriin@...com>
> > Auto-complete BTF IDs for `btf dump id` sub-command. List of possible BTF
> > IDs is scavenged from loaded BPF programs that have associated BTFs, as
> > there is currently no API in libbpf to fetch list of all BTFs in the
> > system.
> >
> > Suggested-by: Quentin Monnet <quentin.monnet@...ronome.com>
> > Signed-off-by: Andrii Nakryiko <andriin@...com>
> > ---
> >  tools/bpf/bpftool/bash-completion/bpftool | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool
> > index 75c01eafd3a1..9fbc33e93689 100644
> > --- a/tools/bpf/bpftool/bash-completion/bpftool
> > +++ b/tools/bpf/bpftool/bash-completion/bpftool
> > @@ -71,6 +71,13 @@ _bpftool_get_prog_tags()
> >          command sed -n 's/.*"tag": "\(.*\)",$/\1/p' )" -- "$cur" ) )
> >  }
> >
> > +_bpftool_get_btf_ids()
> > +{
> > +    COMPREPLY+=( $( compgen -W "$( bpftool -jp prog 2>&1 | \
> > +        command sed -n 's/.*"btf_id": \(.*\),\?$/\1/p' | \
> > +        command sort -nu )" -- "$cur" ) )
> > +}
>
> Thanks! It works well. It looks like the "sort -nu" is not required,
> however? Bash completion on my system seems to run the equivalent of
> "sort -u" on the results anyway, ignoring the ordering you made just
> before. As I understand this is what completion always does, unless we
> pass "-o nosort" to "complete".
>
> E.g. I get the same following output:
>
>         1     1234  191   222   25
>
> When completing with this function:
>
>         _bpftool()
>         {
>                 COMPREPLY+=( $( compgen -W "$( \
>                         command echo '1 1 1 191 1234 25 222')"))
>         }
>         complete -F _bpftool bpftool
>
> or with that one:
>
>         _bpftool()
>         {
>                 COMPREPLY+=( $( compgen -W "$( \
>                         command echo '1 1 1 191 1234 25 222' | \
>                         command sort -nu )" ) )
>         }
>         complete -F _bpftool bpftool
>
> Could you double check you have the same thing on your setup, please? If
> so we can just remove the "sort -nu".

Yeah, seems like it behaves the same without sort -nu, I dropped it in
v2. Thanks!

>
> Quentin