Re: Question about get_cached_commit_buffer()

Jeff King [off-list ref] writes:

I think that repeating the oid is intentional; the point is to dump how
the traversal code is hitting the endpoints, even if we do so multiple
times.

The --oneline behavior just looks like a bug. I think --format is broken
with --show-all, too (it does not show anything!).

I do not know about the --format thing, but the part about --oneline
being a bug is correct.  I've known about the oneline that does not
show anything other than the oid (not even end-of-line) for unparsed
commits for a long time---I just didn't bother looking into fixing
it exactly because this is only a debugging aid ;-)

Though I think it would be equally correct to have set_commit_buffer()
just throw away the existing cache entry and replace it with this one. I
don't think there's a real reason to prefer the old to the new. And that
might be worth doing if it would let us drop get_cached_commit_buffer()
as a public function. But...
...
In my opinion it's not really worth trying to make it private. The
confusion you're fixing in the first two calls is not due to a bad API,
but due to some subtly confusing logic in that code's use of the API. ;)

Yup.

So I'd probably do this:
...

Makes sense to me.

On Wed, Feb 21, 2018 at 02:22:05PM -0800, Junio C Hamano wrote:

quoted

I think that repeating the oid is intentional; the point is to dump how
the traversal code is hitting the endpoints, even if we do so multiple
times.

The --oneline behavior just looks like a bug. I think --format is broken
with --show-all, too (it does not show anything!).

I do not know about the --format thing,[...]

Hmm, maybe it is fine. I thought before that I got funny output out of
"git log --show-all --format", but I can't seem to reproduce it now.

being a bug is correct.  I've known about the oneline that does not
show anything other than the oid (not even end-of-line) for unparsed
commits for a long time---I just didn't bother looking into fixing
it exactly because this is only a debugging aid ;-)

Out of curiosity, do you actually use --show-all for anything? I didn't
even know it existed until this thread, and AFAICT nobody but Linus has
ever recommended its use. And it does not even seem that useful as a
general debugging aid.

So what I'm wondering is whether we should consider just ripping it out
(but I'm OK with keeping it, as once the commit-buffer stuff is fixed,
it's probably not hurting anybody).

-Peff