Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <eb5ab9553c419b8259f5494664865597b6c5d4db.camel@infradead.org>
Subject: Re: Getting rid of infradead.org - corrupted subjects
From:   David Woodhouse <dwmw2@infradead.org>
To:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        mark@msapiro.net
Cc:     workflows@vger.kernel.org,
        Konstantin Ryabitsev <konstantin@linuxfoundation.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        MTD Maling List <linux-mtd@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Uwe =?ISO-8859-1?Q?Kleine-K=F6nig?= 
        <u.kleine-koenig@pengutronix.de>
Date:   Wed, 25 May 2022 10:55:18 +0100
In-Reply-To: <CAMuHMdWL93+r0cofwHKj1k-gUo9nk3OzUf6gtY68sK4JNibyNg@mail.gmail.com>
References: <b36280be-9993-9a78-0960-4094efeed1aa@linaro.org>
         <CAMuHMdWL93+r0cofwHKj1k-gUo9nk3OzUf6gtY68sK4JNibyNg@mail.gmail.com>
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On Wed, 2022-05-25 at 10:34 +0200, Geert Uytterhoeven wrote:
> CC dwmw2

Thanks, Geert.

> On Wed, May 25, 2022 at 10:07 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org> wrote:
>=20
> > The address list is semi-random as I don't know whom to approach.
> > Problem: infradead.org corrupts email subjects by changing:
> > s/,/, /

I found an old thread on mailman-users which appears to be claiming
that it's just standard folding as described in RFC2822 =C2=A72.2.3.

https://mail.python.org/pipermail/mailman-users/2007-May/057119.html

2.2.3. Long Header Fields

   Each header field is logically a single line of characters comprising
   the field name, the colon, and the field body.  For convenience
   however, and to deal with the 998/78 character limitations per line,
   the field body portion of a header field can be split into a multiple
   line representation; this is called "folding".  The general rule is
   that wherever this standard allows for folding white space (not
   simply WSP characters), a CRLF may be inserted before any WSP.  For
   example, the header field:

           Subject: This is a test

   can be represented as:

           Subject: This
            is a test

But this is folding at a *comma*, not at whitespace. The original
subject line was (in a single line):

Subject: [PATCH v2] dt-bindings: mtd: jedec,spi-nor: remove unneeded proper=
ties

... and Mailman 'folded' it in the wrong place to:

Subject: [PATCH v2] dt-bindings: mtd: jedec,
 spi-nor: remove unneeded properties

That *isn't* proper folding because it didn't happen at a whitespace.

I do need to upgrade to Mailman 3 at some point; I've been
procrastinating on the basis that it "ain't broke". For the time being
I've just disabled folding in MM2 with a trivial hack:

--- Message.py.orig	2022-05-25 02:51:05.917145192 -0700
+++ Message.py	2022-05-25 02:50:44.137142069 -0700
@@ -49,7 +49,7 @@ class Generator(email.Generator.Generato
        Headers will by default _not_ be folded in attachments.
     """
     def __init__(self, outfp, mangle_from_=3DTrue,
-                 maxheaderlen=3D78, children_maxheaderlen=3D0):
+                 maxheaderlen=3D0, children_maxheaderlen=3D0):
         email.Generator.Generator.__init__(self, outfp,
                 mangle_from_=3Dmangle_from_, maxheaderlen=3Dmaxheaderlen)
         self.__children_maxheaderlen =3D children_maxheaderlen

Looking at http://lists.infradead.org/pipermail/testlist/2022-May/subject.h=
tml
it seems to have had the desired effect. Please let me know if not (or
if there are other side-effects).

Thanks for the report.

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