On Sun, Aug 7, 2016 at 7:12 AM, Michael S. Tsirkin <m...@redhat.com> wrote:
> On Fri, Aug 05, 2016 at 08:39:58AM -0700, Junio C Hamano wrote:
>> "Michael S. Tsirkin" <m...@redhat.com> writes:
>> > On Thu, Sep 10, 2015 at 11:39:49AM -0700, Junio C Hamano wrote:
>> >> The problem with "empty commit trick" is that it is a commit whose
>> >> sole purpose is to describe the series, and its presence makes it
>> >> clear where the series ends, but the topology does not tell where
>> >> the series begins, so it is an unsatisifactory half-measure.
>> >
>> > Actually, when using topic branches the series always ends at head, so
>> > it's better to keep the empty commit where series begins.
>> But that would mean that you would need to destroy and recreate more
>> commits than you would need to.  If you have a five-commit series
>> (with the bottom "description" one, you would have six commits) and
>> you are already happy with the bottom two but want to update the
>> third one, you wuld have to "rebase -i" all six of them, reword the
>> bottom "description" to adjust it to describe the new version of the
>> third one _before_ you even do the actual update of the third one.
>> That somehow feels backwards, and that backward-ness comes from the
>> fact that you abused a single-parent commit for the purpose it is
>> not meant to be used (i.e. they are to describe individual changes),
>> because you did not find a better existing mechanism (and I suspect
>> there isn't any, in which case the solution is to invent one, not
>> abusing an existing mechanism that is not suited for it).
> A flag that marks a commit "beginning of series" then?

git-notes was mentioned in this thread back in 2015, but I think it's
discarded because of the argument that's part of the cover letter was
not meant to be kept permanently. But I think we can still use it as a
local/temporary place for cover letter instead of the empty commit at
the topic's tip. It is a mark of the beginning of commit, it does not
require rewriting history when you update the cover letter, and
git-merge can be taught to pick it up when you're ready to set it in
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