Pillar
The DevKosher Git server speaks protocol v2 because it wrote it. There is no upstream binary in the critical path.
v2 negotiation — ls-refs and fetch — over smart HTTP and over SSH. Graph negotiation, delta pack generation and reachability bitmaps are the three places where a naive implementation becomes unusable past a few thousand repositories: the hot path is therefore written in C and called from Rust.
Loose and packed formats, deltas, .idx v2 index, multi-pack-index and commit-graph. The reference corpus the implementation is measured against is the real estate of the forge.
Git LFS with batch transfer and locks. Submodules are resolved by the platform, not by a side service.
A conformance suite runs upstream git, unmodified, against our server with the third-party process stopped. The verdict is the number of passing cases over the total — never a hand-written boolean.
