On Fri, Dec 4, 2020 at 5:39 PM Elijah Newren [off-list ref] wrote:

On Thu, Dec 3, 2020 at 10:16 PM Felipe Contreras
[off-list ref] wrote:

quoted

We want --ff-only to make sense only when no --merge or --rebase option
is specified.

A lot of git commands have opposite options, and git allows them both
to be specified with the last one winning.  Thus, much like
  git log --patch --no-patch
mean show logs without patches and
  git log --no-patch --patch
means show logs with patches, I would similarly expect the following
two commands to have opposite behavior:
  git pull --merge --no-ff
  git pull --no-ff --merge

Good point.

Although I presume you meant --ff-only.

Taking that into consideration it may be possible to make --ff-only
work straightforwardly.

Further changes to the code are needed though. In the meantime I'm
sending a quick patch on top of this series.

Cheers.

-- 
Felipe Contreras