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

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Message-ID: <20190929101443.GB1907778@kroah.com>
Date:   Sun, 29 Sep 2019 12:14:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Matthias Maennich <maennich@...gle.com>,
        Jessica Yu <jeyu@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Martijn Coenen <maco@...roid.com>,
        Will Deacon <will.deacon@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/7] nsdeps: make generated patches independent of locale

On Sun, Sep 29, 2019 at 10:18:50AM +0900, Masahiro Yamada wrote:
> On Sat, Sep 28, 2019 at 3:14 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Sat, Sep 28, 2019 at 12:42:28AM +0900, Masahiro Yamada wrote:
> > > On Fri, Sep 27, 2019 at 10:27 PM Matthias Maennich <maennich@...gle.com> wrote:
> > > >
> > > > 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.
> > >
> > >
> > > I prefer to keep it close to the locale-dependent code.
> > >
> > >
> > >
> > > If I move it to somewhere else, I need to add a comment like
> > >
> > > # make "sort" command deterministic
> > > export LANG=C
> > >
> > > Otherwise, people would have no idea why it is needed.
> >
> > A comment is fine, it documents why it is here and it keeps anyone from
> > having to remember to add it to anything else that changes in here.
> >
> > thanks,
> >
> > greg k-h
> 
> 
> Huh, people who live in a country with English as mother tongue
> cannot understand the i18n because English is the
> only language in the world?

Heh, I live in a country where English is not the "mother tongue" and I
totally missed this, sorry about that :(

> For example, in my locale (ja_JP.UTF-8)
> 
> I can see messages in Japanese as follows:
> 
> $ sh  scripts/nsdeps
> cat: /modules.order: そのようなファイルやディレクトリはありません

Ugh, I forgot this would change the error messages from other programs.

You are right, your proposal isn't ok, I missed this given that I am
used to programming in English.

sorry,

greg k-h