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Refs

If the object database answers "what is stored," refs answer "what names point to which objects right now."

What Refs Do

Refs provide names for repository state:

  • branches,
  • tags,
  • remote-tracking refs,
  • HEAD.

Without refs, commits would still exist, but most everyday repository workflows would become much harder to navigate.

Why HEAD Is Special

HEAD is the current checkout target.

In common branch-attached workflows, it is a symbolic ref such as:

ref: refs/heads/main

In detached workflows, it can point directly to a commit ID.

That is why HEAD is both part of the ref system and more special than ordinary branch refs.

Why Ref Updates Need Care

Ref writes are high-value metadata writes. If they are not protected properly, the repository can end up with:

  • lost branch movement,
  • incorrect old-value assumptions,
  • half-written metadata,
  • inconsistent branch state.

That is why this project centralizes lock-file and atomic-write behavior for ref updates rather than leaving each command to invent its own approach.