Re: Getting rid of infradead.org - corrupted subjects

[Uwe Kleine-König]

On Wed, May 25, 2022 at 10:55:18AM +0100, David Woodhouse wrote:
> 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@xxxxxxxxxx> wrote:
> > 
> > > 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 §2.2.3.
> 
> 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 properties
> 
> ... 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_=True,
> -                 maxheaderlen=78, children_maxheaderlen=0):
> +                 maxheaderlen=0, children_maxheaderlen=0):
>          email.Generator.Generator.__init__(self, outfp,
>                  mangle_from_=mangle_from_, maxheaderlen=maxheaderlen)
>          self.__children_maxheaderlen = children_maxheaderlen

For the record: Some time ago I debugged that myself, too and found an
equivalent change. So this looks good to me.

Best regards and thanks for caring,
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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