On Mon, May 30, 2016 at 06:43:07PM +0200, Johannes Sixt wrote:

> I think there is logic somewhere in git gc or its minions that gives expired
> objects that have been packed a two weeks extra life time as loose objects.
> 
> That is, reachable loose objects are moved to a pack, but those objects that
> were packed, but become unreachable due to expired reflogs, are evicted from
> the pack and live for another two weeks or so as loose objects.

Sort of. The loose objects should get the mtime of the pack, which is
likely newer than 2 weeks. So it's not a 2-week extension, but it may
take up to 2 weeks for them to go away (and if the pack is already more
than 2 weeks old, the objects are dropped without even loosening).

> As a consequence of this, I always have a few thousand loose objects in my
> busy repositories, no matter how often I collect garbage. Is there a knob
> that removes the extra lease of life of objects without reducing the usual
> expiration times of reflogs etc?

gc.pruneExpire should do this.

I have run into this, too, and it interacts annoyingly with the
background-gc (which complains "you have too many objects; run
git-prune", leaves that in a .lock file, and then every subsequent
auto-gc spews it at me).

I think we should consider dropping the default time to something more
like 1 day. The 2-week period predates reflogs, I believe (OTOH, it does
save objects which you might have used with "git add" but never actually
committed).

-Peff
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