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Re: How de-duplicate similar repositories with alternates

On Thu, Nov 29, 2018 at 03:59:26PM +0100, Ævar Arnfjörð Bjarmason wrote:

> This is the thing I was wrong about, in retrospect probably because I'd
> been putting PATH_TO_REPO in objects/info/alternates, but we actually
> need PATH_TO_REPO/objects, and "git gc" won't warn about this (or "git
> fsck"). Probably a good idea to patch that at some point, i.e. whine
> about paths in alternates that don't have objects, or at the very least
> those that don't exist. #leftoverbits

We do complain about missing directories; see alt_odb_usable().
Pointing to a real directory that doesn't happen to contain any objects
is harder. If there are no loose objects, there might not be any hashed
object directories. For a "real" object database, there should always be
a "pack/" directory. But technically the object storage directory does
not even need to have that; it can just be a directory full of loose
objects that happens not to have any at this moment.

That said, I suspect if we issued a warning for "woah, it looks like
this doesn't have any objects in it, nor does it even have a pack
directory" that nobody would complain.