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Re: [PATCH v1] am: fix signoff when other trailers are present

Phillip Wood <phillip.wood@xxxxxxxxxxxx> writes:

> From: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>
> If there was no 'Signed-off-by:' trailer but another trailer such as
> 'Reported-by:' then 'git am --signoff' would add a blank line between
> the existing trailers and the added 'Signed-off-by:' line. e.g.
>     Rebase accepts '--rerere-autoupdate' as an option but only honors
>     it if '-m' is also given. Fix it for a non-interactive rebase by
>     passing on the option to 'git am' and 'git cherry-pick'.
>     Reported-by: Junio C Hamano <gitster@xxxxxxxxx>
>     Signed-off-by: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>
> Fix by using the code provided for this purpose in sequencer.c.
> Change the tests so that they check the formatting of the
> 'Signed-off-by:' lines rather than just grepping for them.
> Signed-off-by: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>
> ---
> I'm not sure if this should be calling ignore_non_trailer() or not -
> git commit does but git cherry-pick does not. This follows commit and
> cherry-pick in ignoring the value of trailer.ifExists for the signoff.
> I'm a bit surprised they do that - is it correct?

These built-in "sign-off" machinery long predates the "trailer"
thing, so I am not surprised if they do not behave the same.  I
vaguely recall having discussions on this earlier this year, but
details escape me.  

Asking Jonathan, who did a series that ends at 44dc738a ("sequencer:
add newline before adding footers", 2017-04-26), and Christian, who
is the original contirbutor to the "trailer" machinery, for input.