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Subject: Re: [PATCH v2] bpftool: exclude bash-completion/bpftool from
 .gitignore pattern
To:     Masahiro Yamada <yamada.masahiro@socionext.com>,
        Daniel Borkmann <daniel@iogearbox.net>
Cc:     Sirio Balmelli <sirio@b-ad.ch>, Song Liu <songliubraving@fb.com>,
        Alexei Starovoitov <ast@kernel.org>, netdev@vger.kernel.org,
        Yonghong Song <yhs@fb.com>,
        Taeung Song <treeze.taeung@gmail.com>,
        linux-kernel@vger.kernel.org,
        Jakub Kicinski <jakub.kicinski@netronome.com>,
        Martin KaFai Lau <kafai@fb.com>, bpf@vger.kernel.org
References: <1556718359-1598-1-git-send-email-yamada.masahiro@socionext.com>
From:   Quentin Monnet <quentin.monnet@netronome.com>
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Date:   Wed, 1 May 2019 15:02:26 +0100
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2019-05-01 22:45 UTC+0900 ~ Masahiro Yamada <yamada.masahiro@socionext.com>
> tools/bpf/bpftool/.gitignore has the "bpftool" pattern, which is
> intended to ignore the following build artifact:
> 
>   tools/bpf/bpftool/bpftool
> 
> However, the .gitignore entry is effective not only for the current
> directory, but also for any sub-directories.
> 
> So, from the point of .gitignore grammar, the following check-in file
> is also considered to be ignored:
> 
>   tools/bpf/bpftool/bash-completion/bpftool
> 
> As the manual gitignore(5) says "Files already tracked by Git are not
> affected", this is not a problem as far as Git is concerned.
> 
> However, Git is not the only program that parses .gitignore because
> .gitignore is useful to distinguish build artifacts from source files.
> 
> For example, tar(1) supports the --exclude-vcs-ignore option. As of
> writing, this option does not work perfectly, but it intends to create
> a tarball excluding files specified by .gitignore.
> 
> So, I believe it is better to fix this issue.
> 
> You can fix it by prefixing the pattern with a slash; the leading slash
> means the specified pattern is relative to the current directory.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
> 
> Changes in v2:
>   - Add more information to the commit log to clarify my main motivation
>   - Touch "bpftool" pattern only
> 
>  tools/bpf/bpftool/.gitignore | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/bpf/bpftool/.gitignore b/tools/bpf/bpftool/.gitignore
> index 67167e4..8248b8d 100644
> --- a/tools/bpf/bpftool/.gitignore
> +++ b/tools/bpf/bpftool/.gitignore
> @@ -1,5 +1,5 @@
>  *.d
> -bpftool
> +/bpftool
>  bpftool*.8
>  bpf-helpers.*
>  FEATURE-DUMP.bpftool
> 

Thanks a lot for the changes!

Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>