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Re: [PATCH v3] rev-list: exclude promisor objects at walk time




On Tue, Apr 09, 2019 at 04:42:55PM -0700, Josh Steadmon wrote:

> >   warning: reflog of 'HEAD' references pruned commits
> >   warning: reflog of 'refs/heads/master' references pruned commits
> >   fatal: unable to read 71905dfcd543b7cbb0b4b66fbd20379e67220557
> >   error: last command exited with $?=128
> >   not ok 23 - repack -d does not irreversibly delete promisor objects
> > 
> 
> Thank you for catching this. I haven't yet figured out the cause. I will
> look into this more tomorrow and then send a V4 once I've fixed it.

I'm concerned that this is a sign that the approach I suggested does not
actually work everywhere. I.e., could this be a case where we have some
non-promisor object that points to a sub-object that is reachable from
the promisor pack, but not a direct tip? Before your patch we'd consider
that sub-object a promisor (because we enumerate all of the graph that
we do have and mark each such object), but afterwards we would not.

And I wonder if that confuses pack-objects. Though I think it would
confuse it in the _opposite_ direction. I.e., using
--exclude-promisor-objects would count such an object as not-a-promisor
and would be more inclined to include it in the new pack.

It is curious that this only turns up with GIT_TEST_COMMIT_GRAPH=1, too.
It seems like any such problem ought to be independent of that.

Puzzling...

-Peff