linux-kernel - Re: [RFC] Documentation: kbuild: Add description of git for reproducible builds

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Message-ID: <Y1FVphEyu23U0jho@debian.me>
Date:   Thu, 20 Oct 2022 21:05:26 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Dan Li <ashimida@...ux.alibaba.com>
Cc:     masahiroy@...nel.org, michal.lkml@...kovi.net,
        ndesaulniers@...gle.com, corbet@....net,
        linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Nicolas Schier <n.schier@....de>
Subject: Re: [RFC] Documentation: kbuild: Add description of git for
 reproducible builds

On Thu, Oct 20, 2022 at 03:38:23AM -0700, Dan Li wrote:
> diff --git a/Documentation/kbuild/reproducible-builds.rst b/Documentation/kbuild/reproducible-builds.rst
> index 071f0151a7a4..13397f38c358 100644
> --- a/Documentation/kbuild/reproducible-builds.rst
> +++ b/Documentation/kbuild/reproducible-builds.rst
> @@ -119,6 +119,16 @@ To avoid this, you can make the vDSO different for different
>  kernel versions by including an arbitrary string of "salt" in it.
>  This is specified by the Kconfig symbol ``CONFIG_BUILD_SALT``.
>  
> +Git
> +-----------------------
> +
> +Uncommitted changes or different commit ids in git can also lead
> +to different compilation results. For example, after executing
> +``git reset HEAD^``, even if the code is the same, the
> +``include/config/kernel.release`` generated during compilation
> +will be different, which will eventually lead to binary differences.
> +See ``scripts/setlocalversion`` for details.
> +

Briefly read the script, I don't see what the correlation between git
reset with LOCALVERSION thing is. Also, does the exact state of git
repository required for reproducible builds?

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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