[gilesknap]

What changed

A comment only. No value changes; tiled.image.tag stays 0.2.7 and the rendered chart is byte-identical.

Why

services/p46-tiled/templates/configmap.yaml embeds a copy of the DLS access-policy plugin, and it uses PrincipalType.external in _check_principal and build_input. Upstream removed that enum member in tiled v0.2.10 (bluesky/tiled#1377, commit a44a8f8, released 2026-05-22); externally-authenticated principals became ordinary PrincipalType.user principals so that roles, identities and API keys work for them.

So raising image.tag past 0.2.9 on its own makes the plugin fail on import and the Tiled server will not start. The failure is at runtime inside a ConfigMap, so helm template/ci_verify.sh cannot see it, and there was no upstream CHANGELOG entry for the removal.

The guard goes next to tag: because that is where the next person will make the change, and this is the value that decides which Python actually imports the plugin. (The chart-version bumps Renovate raises against Chart.yaml do not move the image, because this explicit tag overrides the chart's appVersion default — that behaviour is unchanged between chart 0.2.2 and 0.2.18.)

What the real fix looks like

Not this PR. It is a three-line port that must land in the same commit as the tag bump, because under 0.2.7 proxied-OIDC principals still are external and porting alone would 401 every user:

-        if principal.type != PrincipalType.external:
+        if principal.type != PrincipalType.user:
             raise HTTPException(
                 status_code=HTTP_401_UNAUTHORIZED,
-                detail=f"Principal of type {PrincipalType.external}"
+                detail=f"Principal of type {PrincipalType.user}"
...
-                and principal.type is PrincipalType.external
+                and principal.type is PrincipalType.user

That is exactly the patch DLS already merged in its canonical copy (DiamondLightSource/blueapi#1488) and exactly what epics-containers/t11-services already runs alongside image.tag: 0.2.18.

Testing

services/p46-tiled/values.yaml was re-parsed with PyYAML after the edit and tiled.image.tag still reads '0.2.7'. I did not deploy or run helm template against the OCI charts from here.

Refs #219

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Summary by CodeRabbit

• Documentation
  • Added guidance on maintaining compatibility when updating the Tiled image version. Updates beyond the supported version require a corresponding access-policy compatibility change to prevent service startup failures.

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• services/p46-tiled/values.yaml

📝 Walkthrough

Walkthrough

A comment above the tiled image tag documents a compatibility constraint involving the access-policy plugin and tiled v0.2.10. It states that a tag bump past v0.2.9 must include a plugin update in the same commit.

Changes

Tiled tag compatibility

Layer / File(s)	Summary
Image tag upgrade warning services/p46-tiled/values.yaml	A comment warns against raising the image tag past v0.2.9 without also changing the plugin’s PrincipalType.external usage to PrincipalType.user.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: 🔵 Low · up to 820bf

The warning should be corrected so maintainers do not mistake a future access-policy failure for a server startup failure. This change only adds the warning and does not change deployment behavior.

🚥 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 and concisely describes the added warning about upgrading Tiled past 0.2.9 without porting the access policy.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@services/p46-tiled/values.yaml`:
- Around line 18-25: Update the warning in the Tiled version guidance in
values.yaml: replace the claim that the server fails to import and start with
the accurate behavior that the plugin can load but access-policy calls fail when
evaluating the missing PrincipalType.external member. Preserve the version
threshold and migration guidance to PrincipalType.user.

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[gilesknap]

Independent review

Checked

• Diff is comment-only: PyYAML parses services/p46-tiled/values.yaml on this branch and on main to an identical document, and tiled.image.tag is still the string '0.2.7'. Since Helm reads values through the same YAML parse, the rendered chart cannot differ.
• Comment placement: the block is at indent 4 under image: and immediately above tag:, which is the line a human edits. No indentation or anchor damage.
• Neither the PR body nor the commit message uses a closing keyword; only Refs, so merging will not close Tiled >= 0.2.10 breaks the copied access-policy plugin (PrincipalType.external removed) in p46/p47/p48/p49-services #219.
• Claims verified against upstream: PrincipalType has external at tiled v0.2.9 and not at v0.2.10; Reconcile device code flow and API keys with ProxiedOIDCAuthenticator bluesky/tiled#1377 merged 2026-05-11 and is an ancestor of the v0.2.10 tag (released 2026-05-22). t11-services/services/t11-tiled/templates/configmap-access-policy.yaml uses PrincipalType.user in the same three places with image.tag: 0.2.18. The chart's deployment template uses .Values.image.tag | default .Chart.AppVersion, so the open Renovate chart bump does not move the image.

Found (1 minor, fixed in 30cb6a8)
The comment said the server "fails to import the plugin and will not start". That is not what happens: all three PrincipalType.external uses are inside function bodies (_check_principal, build_input), so the module imports cleanly and the server starts. ExternalPolicyDecisionPoint in v0.2.10 calls build_input from filters, allowed_scopes, init_node and modify_node, so every authenticated request then raises AttributeError and returns HTTP 500 instead. The guidance (do not bump past 0.2.9 without porting to PrincipalType.user in the same commit) is correct; only the described failure mode was wrong. I reworded those lines; the file still parses identically to main.

Blocker 0, major 0, minor 1 (fixed), nit 0. Ready to merge.

Independent review by Claude Code.