key

git splice key [--upstream <name>] <path> [<new-key>]

Prints the key of a splice's upstream in this repository: its fetched branches are refs/splices/<key>/<branch>. With <new-key>, renames the key and moves its refs along.

$ git splice key vendor/pkg-a
pkg-a

$ git splice key vendor/pkg-a a && git log --oneline -1 splices/a/main
ok   vendor/pkg-a: renamed key 'pkg-a' to 'a'
703b936 pkg-a: a second commit, after the clone

The first fetch records the key in the repository's config. How the commands change these refs, and what they cost: splice-refs. A splice with several upstreams has a key for each, and splices that name the same URL share one.