netdev - Re: [PATCH] tools: bpftool: fix reading from /proc/config.gz

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Date:   Mon, 5 Aug 2019 12:06:49 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Stanislav Fomichev <sdf@...ichev.me>
Cc:     Peter Wu <peter@...ensteyn.nl>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        Stanislav Fomichev <sdf@...gle.com>,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: Re: [PATCH] tools: bpftool: fix reading from /proc/config.gz

On Mon, 5 Aug 2019 08:29:36 -0700, Stanislav Fomichev wrote:
> On 08/05, Peter Wu wrote:
> > /proc/config has never existed as far as I can see, but /proc/config.gz
> > is present on Arch Linux. Execute an external gunzip program to avoid
> > linking to zlib and rework the option scanning code since a pipe is not
> > seekable. This also fixes a file handle leak on some error paths.  
> Thanks for doing that! One question: why not link against -lz instead?
> With fork/execing gunzip you're just hiding this dependency.
> 
> You can add something like this to the Makefile:
> ifeq ($(feature-zlib),1)
> CLFAGS += -DHAVE_ZLIB
> endif
> 
> And then conditionally add support for config.gz. Thoughts?

+1