Well, the thing is, sharing object directories actually makes things
*harder* to check, rather than easier.
It can be a nice space optimization, and yes, if there really is a lot of
shared state, it can make it much cheaper to do some of the checks, but
right now we have absolutely *no* way for fsck to then do the reachability
check, because there is no way to tell fsck where all the refs are (since
now the refs come in from multiple repositories!)
So the individual objects get cheaper to fsck (no need to fsck shared
objects over and over again), but the reachability gets much harder to
fsck.
It's not an insurmountable problem, or even necessarily a very large one,
but it boils down to one very basic issue:
- nobody seems to actually *use* the shared object directory model!
The thing is, with pack-files and alternates directories, a lot of the
original reasons for shared object directories simply don't exist..
Linus
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