Three refinements that make the plan smaller rather than bigger, plus
an honest accounting of what stays awkward.
The .libreportal-storage marker now does three jobs instead of one:
admission, mount detection and migrate provenance. Marker-lives-on-the-
drive replaces the findmnt/REQUIRE_MOUNT/fs_uuid guard family with a
single file read, and it covers cases those miss — a LUKS volume that
was never unlocked, a dropped network mount. It also unblocks adopting
a drive that already holds app data, which strict emptiness forbade;
that relaxation is free, because planting a marker requires write
access you'd have to already have.
appDir becomes the one place availability is checked, so an absent
drive fails centrally instead of needing a guard at 200 callers. And
the sweep verifies itself: retire containers_dir to a sentinel path so
survivors fail loudly on something that cannot exist.
Pinning infra apps becomes CFG_<APP>_STORAGE_PINNED, mirroring
MULTI_INSTANCE, rather than a hardcoded list in the engine.
New §9 records the four things that don't get a clean answer: the
TOCTOU window and the parent-writability restriction that closes it,
two registries that will look like one, a 90-file diff that only
process makes safe, and large moves simply being slow.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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