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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Sat, 10 Nov 2018 01:39:48 +0900
Message-ID: <CAK7LNARwckFFe4kK2evU=y6xd+gd+PJwj0GNiRscnReGnpVbcA@mail.gmail.com>
Subject: Re: [PATCH] Revert "scripts/setlocalversion: git: Make -dirty check
 more robust"
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Genki Sky <sky@genki.is>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Wed, Nov 7, 2018 at 3:39 AM Guenter Roeck <linux@roeck-us.net> wrote:
>
> This reverts commit 6147b1cf19651c7de297e69108b141fb30aa2349.
>
> The reverted patch results in attempted write access to the source
> repository, even if that repository is mounted read-only.
>
> Output from "strace git status -uno --porcelain":
>
> getcwd("/tmp/linux-test", 129)          = 16
> open("/tmp/linux-test/.git/index.lock", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0666) =
>         -1 EROFS (Read-only file system)
>
> While git appears to be able to handle this situation, a monitored build
> environment (such as the one used for Chrome OS kernel builds) may detect
> it and bail out with an access violation error. On top of that, the attempted
> write access suggests that git _will_ write to the file even if a build output
> directory is specified. Users may have the reasonable expectation that the
> source repository remains untouched in that situation.
>
> Fixes: 6147b1cf19651 ("scripts/setlocalversion: git: Make -dirty check more robust"
> Cc: Genki Sky <sky@genki.is>
> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---

Applied to linux-kbuild/fixes.


Thanks!


>  scripts/setlocalversion | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/setlocalversion b/scripts/setlocalversion
> index 79f7dd57d571..71f39410691b 100755
> --- a/scripts/setlocalversion
> +++ b/scripts/setlocalversion
> @@ -74,7 +74,7 @@ scm_version()
>                 fi
>
>                 # Check for uncommitted changes
> -               if git status -uno --porcelain | grep -qv '^.. scripts/package'; then
> +               if git diff-index --name-only HEAD | grep -qv "^scripts/package"; then
>                         printf '%s' -dirty
>                 fi
>
> --
> 2.7.4
>


-- 
Best Regards
Masahiro Yamada