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> On Mon, 07 Aug 2017 10:49:28 -0700
> Junio C Hamano <gitster@pobox.com> wrote:
>
>> Phillip Wood <phillip.wood@talktalk.net> writes:
>>
>>> From: Phillip Wood <phillip.wood@dunelm.org.uk>
>>>
>>> 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@pobox.com>
>>>
>>> Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
>>>
>>> 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@dunelm.org.uk>
>>> ---
>>> 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.
>
> Regarding ignore_non_trailer(), I believe that's because "git commit"
> wants to tolerate blank lines and comments after the "real" commit
> message, whereas "git cherry-pick" doesn't need to. As far as I can
> tell, this "git am" case is similar to "git cherry-pick".
>
> Regarding trailer.ifExists, the then existing behavior was to refrain
> from writing a new sign-off line only if it would be a duplicate of the
> last one, regardless of trailer.ifExists (as Junio says, back then, the
> sign-off mechanism and the trailer mechanism were independent). I
> preserved that behavior.
>