Module fingerprint 

The proof that a move lost nothing.

A migration takes one of these before a worktree moves and one after, and refuses to call the move a success unless they are equal. It is strong enough to notice a lost untracked file, a dropped staged change, a modified tracked file that reverted, a branch that switched or a HEAD that moved; it is deliberately not taken on any hot path, because it hashes the content of every modified and untracked file. Migration is exceptional and data safety is worth more there than a few milliseconds.

Ignored content (build output, the checkout’s own .ai/local/ state) is attested by presence and size rather than by content: it moves with the directory as everything else does, and hashing a target/ tree to prove a rename would cost minutes for nothing.

Structs

WorktreeFingerprint

What a work tree held at one moment, reduced to digests.

Functions

capture

Take a fingerprint of worktree. whole_tree also walks the directory for the tree manifest, which a copy-based move needs and a rename does not.

differences

Everything that differs between two fingerprints, one line each. Empty means equal.

tree_manifest

Every entry below root, relative, sorted, with kind, size and link target. The .git file of a linked worktree is excluded: it is rewritten by the move on purpose.