linux-kernel - Re: [PATCH 7/7] nsdeps: make generated patches independent of locale

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Date:   Fri, 27 Sep 2019 14:27:26 +0100
From:   Matthias Maennich <maennich@...gle.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Jessica Yu <jeyu@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Martijn Coenen <maco@...roid.com>,
        Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] nsdeps: make generated patches independent of locale

On Fri, Sep 27, 2019 at 06:36:03PM +0900, Masahiro Yamada wrote:
>scripts/nsdeps automatically generates a patch to add MODULE_IMPORT_NS
>tags, and what is nicer, it sorts the lines alphabetically with the
>"sort" command. However, the output from the "sort" command depends
>on locale.
>
>Especially when namespaces contain underscores, the result is
>different depending on the locale.
>
>For example, I got this:
>
>$ { echo usbcommon; echo usb_common; } | LANG=en_US.UTF-8 sort
>usbcommon
>usb_common
>$ { echo usbcommon; echo usb_common; } | LANG=C sort
>usb_common
>usbcommon
>
>So, this means people might potentially send different patches.
>
>This kind of issue was reported in the past, for example,
>commit f55f2328bb28 ("kbuild: make sorting initramfs contents
>independent of locale").
>
>Adding "LANG=C" is a conventional way of fixing when a deterministic
>result is desirable.
>
>Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>---
>
> scripts/nsdeps | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/scripts/nsdeps b/scripts/nsdeps
>index 964b7fb8c546..3754dac13b31 100644
>--- a/scripts/nsdeps
>+++ b/scripts/nsdeps
>@@ -41,7 +41,7 @@ generate_deps() {
> 		for source_file in $mod_source_files; do
> 			sed '/MODULE_IMPORT_NS/Q' $source_file > ${source_file}.tmp
> 			offset=$(wc -l ${source_file}.tmp | awk '{print $1;}')
>-			cat $source_file | grep MODULE_IMPORT_NS | sort -u >> ${source_file}.tmp
>+			cat $source_file | grep MODULE_IMPORT_NS | LANG=C sort -u >> ${source_file}.tmp

I would prefer to have this set throughout the whole runtime of the
script. Otherwise we likely see a followup patch. So, either as an
export at the beginning of this file or as part of the command that
calls this script.

With this

Reviewed-by: Matthias Maennich <maennich@...gle.com>

Cheers,
Matthias

> 			tail -n +$((offset +1)) ${source_file} | grep -v MODULE_IMPORT_NS >> ${source_file}.tmp
> 			if ! diff -q ${source_file} ${source_file}.tmp; then
> 				mv ${source_file}.tmp ${source_file}
>-- 
>2.17.1
>