Expand description
On-disk layout for fetched and composed bundles.
Everything under the cache is content-addressed, so a re-fetch of an
unchanged bundle is a no-op and a rollback is a re-point rather than a
download. current is a symlink swapped by rename, which is atomic on
the same filesystem: a reader either sees the whole previous composition
or the whole new one, never a half-copied tree. State is written the same
way — temp file, then rename.
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