git-lfs-transfer

Concurrent transfer queue and "basic" adapter for Git LFS object uploads and downloads.

Sits between git-lfs-api and git-lfs-store: given a list of (oid, size) pairs, it negotiates a batch with the LFS server, spawns a bounded pool of tasks to drive the resulting actions, and streams progress events back to the caller.

What's implemented today:

• The basic transfer adapter (HTTPS upload via PUT, download via GET, optional verify callback).
• Concurrent dispatch with per-object error reporting; each transfer is independent so partial failures don't tear down the queue.
• Streaming uploads/downloads (no full buffering), and a hash check on the download path.
• Retry on transient failures (5xx, 429, network blips) at both the per-object and batch-request layers. Retry-After is honored when the server pins a delay; otherwise exponential backoff applies.
• Range-resume on interrupted downloads: partial files persist at .git/lfs/incomplete/<oid>.part so the next attempt sends Range: bytes=… rather than re-fetching from byte 0.

Not yet here: tus uploads, custom transfer agents. Tracked in the workspace NOTES.md.

Part of the git-lfs Rust workspace. Experimental — not yet ready for production. License: MIT.