Re: please strip MIME-Version and Content-T{ype,ransfer-Encoding} in git am --scissors

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Hello Junio,

On Thu, Oct 08, 2015 at 12:28:46PM -0700, Junio C Hamano wrote:
> Uwe Kleine-König  <u.kleine-koenig@xxxxxxxxxxxxxx> writes:
> 
> > Hello,
> >
> > when applying the mail below (without the '> ' prefix) using git am
> > --scissors the result looks like:
> >
> > 	$ git show
> > 	commit 26ef0606927cc1979faa4166d7f9f3584b5cdc61
> > 	Author: Tony Lindgren <tony@xxxxxxxxxxx>
> > 	Date:   Tue Oct 6 05:36:17 2015 -0700
> >
> > 	    memory: omap-gpmc: Fix unselectable debug option for GPMC
> > 	    
> > 	    MIME-Version: 1.0
> > 	    Content-Type: text/plain; charset=UTF-8
> > 	    Content-Transfer-Encoding: 8bit
> > 	    
> > 	    Commit 63aa945b1013 ("memory: omap-gpmc: Add Kconfig option for debug")
> > 	    added a debug option for GPMC, but somehow managed to keep it unselectable.
> > 	    
> > 	[...]
> >
> > 	$ git version
> > 	git version 2.6.0
> >
> > The obvious improvement is to strip all headers like git am does without
> > --scissors.
> 
> Does this have anything to do with scissors, though?  If you remove
> everything before "8< ---" in the body of Tony's message (i.e. keep
> the in-body headers starting with "From:" and ending with CTE) and
> try again, I would suspect that you will get the same result.
No, you're wrong here:

ukl@xxxxxxxx:~/gsrc/linux$ head ~/tmp/1444332661.3982_89.ptx\:2\,RS 
From: Tony Lindgren <tony@xxxxxxxxxxx>
Date: Tue, 6 Oct 2015 05:36:17 -0700
Subject: [PATCH] memory: omap-gpmc: Fix unselectable debug option for GPMC
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Commit 63aa945b1013 ("memory: omap-gpmc: Add Kconfig option for debug")
added a debug option for GPMC, but somehow managed to keep it unselectable.

ukl@xxxxxxxx:~/gsrc/linux$ git am ~/tmp/1444332661.3982_89.ptx\:2\,RS
Applying: memory: omap-gpmc: Fix unselectable debug option for GPMC
ukl@xxxxxxxx:~/gsrc/linux$ git cat-file commit HEAD
tree bab01e3e0d0bdd715b86cf7d5c9e8bb9768a30dc
parent c6fa8e6de3dc420cba092bf155b2ed25bcd537f7
author Tony Lindgren <tony@xxxxxxxxxxx> 1444134977 -0700
committer Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> 1444332782 +0200

memory: omap-gpmc: Fix unselectable debug option for GPMC

Commit 63aa945b1013 ("memory: omap-gpmc: Add Kconfig option for debug")
added a debug option for GPMC, but somehow managed to keep it unselectable.

This probably happened because I had some uncommitted changes and the
GPMC option is selected in the platform specific Kconfig.

Let's also update the description a bit, it does not mention that
enabling the debug option also disables the reset of GPMC controller
during the init as pointed out by Uwe Kleine-König
<u.kleine-koenig@xxxxxxxxxxxxxx> and Roger Quadros <rogerq@xxxxxx>.

Fixes: 63aa945b1013 ("memory: omap-gpmc: Add Kconfig option for debug")
Reported-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>

> I also think that the "MIME-Version" thing is what gives this;
> mailinfo and am do not really use it, and consider that the in-body
> header ends there.

I failed to follow you here.

> The right approach to tweak mailinfo to cope with this better would
> be to keep a bit more state inside mailinfo.c::handle_commit_msg()
> so that if we are (1) using in-body headers, (2) have already seen
> _some_ valid in-body header like "Subject:" and "From: ", and (3)
> have not seen a blank line, discard lines that we do not care about
> (e.g. "MIME-VERSION: 1.0").

That sound's right.
 
> > If someone wants a bounce of the original mail, just ask per PM.
> 
> I have no idea what you are talking about here...

The result would be that a copy of the original mail would hit your mailbox if
you asked per private mail (PM).

Best regards
Uwe

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