Wez Furlong :terminal:@b0rk the EdenFS portion of Sapling (https://github.com/facebook/sapling/) has the guts of this inside. Even though that project was built primarily for Sapling (an evolution of Mercurial), it can also mount Git repos. We talked about exposing literally the interface your described for some internal infrastructure in the early days. I'm no longer part of that team so I'm not sure if that ever got implemented, but it wouldn't be difficult if someone was motivated!
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