[shreyas-blacksmith]

Summary

• A non-empty BAZEL_REMOTE_BACKEND_DISCONNECT_TOOLS set now skips MinIO for every build-tool read and every tool's LRU artifacts, not only the names in the set. Named tools keep their existing reason labels (go_disconnect, and so on). Any other tool counts as tool_disconnect. A request with no build-tool identity still reads the backend, which is the quarantine prefix.
• Gzip members and zstd frames uploaded as identity blobs are stored as identity casblobs. Plain blobs are still zstd-compressed at rest. A read returns the original bytes, so the digest does not change.
• Production inventories already set the disconnect list, so this takes effect on the next L1 binary roll. No inventory edit. Rolling back the binary restores the named-tool cut.

Test plan

• go test ./cache/s3proxy/ ./cache/disk/casblob/ ./config/
• After a roll, bazel_remote_s3_backend_lookups_skipped_total{reason="tool_disconnect"} climbs for any tool that is not one of the named labels, and bazel_remote_s3_cache_hits stays at zero for build-tool traffic.

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[blacksmith-staging]

Unlisted tool skips MinIO

With only go named, nx and bazel reads now miss without touching MinIO and count as tool_disconnect; before they were served from MinIO.

_Merge-base

_{This PR c653b7a9}

Also checked · 4 match

Named tool keeps its label
No-identity request still reads MinIO
Gzip blob stored as identity
LRU artifacts cut for every tool

_{Proof on c653b7a9}

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[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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[cursor]

Identity writes skip durability sync

Low Severity

The new Identity store path rewrites the casblob offset table after the body, then closes without an f.Sync. The zstd branch in this function and WriteZstdFrameAndClose both sync after that same seek-back. A crash can persist the body with the placeholder offsets, so readHeader rejects the blob and the guest-cache object is lost.

 

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