backlog#1052 S7 — the final piece: full bucket-namespace isolation
between embedded servers in one process.
Server B's requests resolved B's own ECStore (per-server dispatch landed
earlier), but the store's bucket operations still went through ambient
process facades, so both servers effectively operated on the FIRST
server's disks and metadata:
- LocalPeerS3Client::local_disks_for_pools() called all_local_disk()
(the ambient disk registry = the first published store's context), so
list/make/delete/heal bucket scanned and wrote the wrong volumes.
- BucketMetadata::save() persisted through the ambient object handle, so
a second server's bucket metadata landed in the first server's
.rustfs.sys; set/remove/get/created_at all used the ambient metadata
system.
Now the whole chain is bound to the owning store's InstanceContext:
- S3PeerSys/LocalPeerS3Client gain *_with_instance_ctx constructors and
operate on that context's registered disks; ECStore::new (and the test
store builder) pass the store's context. The legacy constructors keep
the bootstrap default.
- BucketMetadata::save_with_store persists through an explicit store;
BucketMetadataSys::persist_and_set uses the system's own api handle.
- metadata_sys gains instance-scoped variants (get_in / created_at_in /
set_bucket_metadata_in / remove_bucket_metadata_in) that resolve the
context's metadata system and fall back to the ambient default before
the instance cell is initialized (early startup, unchanged behavior).
- The store's bucket handlers (make/get_info/list/delete + the
table-bucket delete guard and emptiness check) use the per-context
variants and this instance's disks.
Acceptance (e2e): two embedded servers with different credentials are now
isolated end to end — each authenticates only its own key, neither sees
the other's buckets or objects, and both data planes stay intact. The
embedded module doc drops the shared-IAM caveat.
579 ecstore bucket/metadata/peer regressions plus the embedded basic and
deferred-IAM e2e stay green.
