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Chris Lu
2cc8a56f86
Adds the .versions/<key>/ expansion to the daily-run's filer-backed
ListFunc. Each call emits one bootstrap.Entry per sibling (real
version files + the bare null version, when found) with the same
sibling state the streaming bootstrap injects via reader.Event:
- Path = logical key (not the .versions/<file> physical path), so
bootstrap.Walk's MatchPath uses the user's intended path.
- VersionID per sibling (version_id or "null").
- IsLatest resolved via parent's ExtLatestVersionIdKey, falling back
to explicit-null-bare, falling back to newest-by-mtime.
- NoncurrentIndex rank computed against the latest's position.
- SuccessorModTime: SuccessorFromEntryStamp if stamped, else the
previous-newer sibling's mtime (legacy derivation).
- IsDeleteMarker from ExtDeleteMarkerKey.
- NumVersions = len(siblings).
Two-pass walk so .versions/ dirs run before regular files; the bare
null-version path is recorded in skipBare so pass 2 doesn't emit it
twice.
expandVersionsDir and lookupNullVersion are ported from
scheduler/bootstrap.go. Sort order, latest resolution, and successor
derivation must agree with that path verbatim so streaming and walker
reach the same verdict on the same objects. Phase 5 deletes the
scheduler copy.
MPU init (.uploads/<id>) remains skipped — the dedicated commit emits
it with IsMPUInit and DestKey.
Tests pin: pointer-wins latest resolution, no-pointer newest-sibling
fallback, explicit-null-is-latest with skipBare suppression of the
bare emission, coincidentally-named .versions folder recursing as a
regular subdir, delete-marker propagation.