reconciler: fix correctImages panic when pod has no containers

[sebrandon1]

Summary

• correctImages accessed pod.Spec.Containers[0] without a length guard in the non-ExtractContent path, causing a panic for pods with an empty containers slice (e.g. evicted or malformed pods)
• The ExtractContent path already had an equivalent len(pod.Spec.Containers) != 1 guard; this brings the fallback path in line
• Adds TestCorrectImages covering both paths, including the empty-containers regression case and an ExtractContent serving-image mismatch case

Test plan

• go test ./pkg/controller/registry/reconciler/... -run TestCorrectImages — all 6 cases pass

Summary by CodeRabbit

• Bug Fixes

  • Prevented reconciliation errors when evaluating workloads with no regular containers.
  • Improved image validation across standard and content-extraction configurations.

• Tests

  • Added coverage for empty-container scenarios, matching and mismatched images, container layouts, and invalid configurations.

[openshift-ci]

Hi @sebrandon1. Thanks for your PR.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 0167e697-d578-4a19-a699-eb54859334a7

📥 Commits

Reviewing files that changed from the base of the PR and between f8f3f72 and e47833c.

📒 Files selected for processing (2)

• pkg/controller/registry/reconciler/grpc.go
• pkg/controller/registry/reconciler/grpc_test.go

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The correctImages helper now avoids indexing an empty container list. New table-driven tests cover non-ExtractContent and ExtractContent catalog sources, image mismatches, empty containers, and invalid container layouts.

Changes

Image validation

Layer / File(s)	Summary
Correct image guard and validation tests pkg/controller/registry/reconciler/grpc.go, pkg/controller/registry/reconciler/grpc_test.go	correctImages returns false when a pod has no containers. Tests cover matching and mismatched images, ExtractContent container layouts, and incorrect init-container counts.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to e4783

This change prevents a panic when a pod has no containers while preserving the existing behavior for normal pods. No actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: pdudley

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 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 main change: fixing the correctImages panic when a pod has no containers.
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.

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

Warning

Some tools did not complete. Review the errors below.

🔧 golangci-lint (2.12.2)

Error: can't load config: unsupported version of the configuration: "" See https://golangci-lint.run/docs/product/migration-guide for migration instructions
The command is terminated due to an error: can't load config: unsupported version of the configuration: "" See https://golangci-lint.run/docs/product/migration-guide for migration instructions

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[tmshort]

/ok-to-test

[tmshort]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tmshort

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