Felipe Contreras <felipe.contre...@gmail.com> writes:

> If the user set --ff, it's expected that if theres's nothing to do we
> fast-forward our current HEAD, which is a no-op.
> Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
> ---

This is about "git cherry-pick topic..master" which is a misspelt
form of "git cherry-pick master..topic", or alternatively, a script
calling "git cherry-pick ..$branch" that turns out to be giving an
empty set, isn't it?

I suspect that it is perfectly fine to turn this die() into a
warning or an informational feedback (or be silent when --quiet is
given) and make the command exit with success.  If the user asked
for a no-op, the result should be a no-op, but because a no-op is a
strange thing to ask for, and is deserved to be warned about.

But I do not see why we should behave differently between with and
without --ff option.

I also notice this funkiness with "--ff":

        git.git/master$ git checkout master^
        git.git/(ed73fe5...)$ git cherry-pick master^0
        [detached HEAD 32af3ed] Update draft release notes to 1.8.4
         1 file changed, 53 insertions(+)
        git.git/(32af3ed...)$ git checkout master^
        git.git/(ed73fe5...)$ git cherry-pick --ff master^0

The last cherry-pick shows nothing.  The user can notice that
something useful has happened only because git-prompt script is in
use (and he is experimenting on a detached HEAD), but otherwise
there is no feedback.  I think it should, unless given --quiet, say
something like "fast-forwarded to ..." to avoid user confusion.

>  sequencer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> diff --git a/sequencer.c b/sequencer.c
> index d8f9d30..b9d4b48 100644
> --- a/sequencer.c
> +++ b/sequencer.c
> @@ -749,7 +749,7 @@ static void prepare_revs(struct replay_opts *opts)
>       if (prepare_revision_walk(opts->revs))
>               die(_("revision walk setup failed"));
> -     if (!opts->revs->commits)
> +     if (!opts->revs->commits && !opts->allow_ff)
>               die(_("empty commit set passed"));
>  }
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