Reach the object store with the deployment's AWS_* contract

[AdaWorldAPI]

body_bake_v4 demanded BODY_BAKE_V4_ copies of the endpoint, bucket, key id and secret. Every deploy already sets AWS_ENDPOINT_URL, AWS_S3_BUCKET_NAME, AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY — the sandbox and Railway identically — so that asked an operator to duplicate four secrets to serve one artifact, and /helix2 could not work anywhere without them.

Isolation from the map is about paths, not credentials. The cache directory stays v4's own (body-v4) and RAILWAY_VOL is still deliberately not consulted, because that variable steers the map's 1.29 GiB slab cache. Read-only credentials shared with every other consumer of this bucket cannot move anything.

Setting a bake is now two variables — BODY_BAKE_V4_TAG and BODY_BAKE_V4_ASSET — neither with a default.

Why .with_bucket_name stays

AmazonS3Builder::from_env() walks every AWS_* variable and silently drops any whose lowercased name is not one of its config keys. Its bucket key accepts only aws_bucket | aws_bucket_name | bucket_name | bucket (object_store-0.13.2, src/aws/builder.rs:497), so AWS_S3_BUCKET_NAME is discarded with no warning and the build then fails as though the bucket were never configured. The endpoint, credentials and default region are read (:492-497; aws_endpoint_url is an accepted endpoint spelling), so the bucket is the only one to re-apply.

This is the same call shape osm_slab_hydrate already uses, deliberately — that path is proven against this bucket, and a second spelling of the same handshake is a second thing to get wrong.

Also in this change

• Env reads strip surrounding quotes. Some variables in these containers arrive wrapped in literal " (documented for the token vars in medcare-rs's CLAUDE.md); unstripped, they fail as a bad credential rather than a quoting artifact. AWS_* are not currently quoted here — this is defensive.
• A vacuous test replaced. The old guard asserted that a list of string literals started with the prefix they were written with — true by construction, no input could fail it. It now checks the required set carries no BODY_BAKE_V4_ credential name and does carry AWS_S3_BUCKET_NAME.

Verification

End to end against the real bucket with only ambient AWS_* set and no BODY_BAKE_V4_ credentials:

body bake v4: hydrated and verified path=/tmp/v4dir/probe.soa.gz tag=_wire-probe-v4
GET /api/bake/v4 → HTTP 200, content-type: application/gzip, accept-ranges: bytes
body → BSO2-wiring-probe-not-a-bake

The throwaway probe object was deleted afterwards; q2/bakes/ is back to its original seven entries. Also: cargo clippy -p cockpit-server --all-targets clean, cargo fmt --check clean, 7/7 body_bake_v4 tests pass.

No file outside body_bake_v4.rs is touched. /helix, the map path and the manifest remain byte-identical to main.

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Generated by Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved object-storage configuration handling by consistently applying endpoint, bucket, credentials, and region settings.
  • Added support for AWS_REGION, including automatic region selection when no explicit region is provided.
  • Improved validation for incomplete configurations and handling of quoted environment values.

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📝 Walkthrough

Walkthrough

v4 body baking now reads shared AWS object-store settings, normalizes environment values, supports region aliases and defaults, and reapplies the values during S3 client construction. Documentation and tests cover the revised configuration contract.

Changes

Shared AWS configuration

Layer / File(s)	Summary
Configuration contract and environment parsing crates/cockpit-server/src/body_bake_v4.rs	The documentation defines shared AWS_* credentials and object-store variables. Environment values are trimmed, unquoted, and validated. AWS_REGION is supported with an "auto" fallback.
Storage wiring and configuration validation crates/cockpit-server/src/body_bake_v4.rs	build_store applies normalized bucket, endpoint, credentials, and region values to AmazonS3Builder. Tests cover required inputs, normalization, incomplete configuration, and region fallback.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to a9cad

Body bake v4 now uses normalized shared AWS configuration for object-store access. No concrete current-head merge-blocking risk remains.

Poem

A rabbit tunes the AWS nest
With quoted keys laid down to rest
The region hops to “auto” bright
The S3 path is clean and right
Tests thump approval through the night

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: object-store access now uses the deployment's existing AWS_* environment-variable contract.
Docstring Coverage	✅ Passed	Docstring coverage is 91.67% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In `@crates/cockpit-server/src/body_bake_v4.rs`:
- Line 156: Normalize the AWS endpoint URL, access key ID, secret access key,
and optional region locally before the AmazonS3Builder construction in the
surrounding body-bake flow. Pass the normalized values through the builder
configuration without mutating process-wide environment variables, while
preserving existing bucket handling and store construction behavior.

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