fix: implement the defined but unconsumed spec.tls.ca.secretName field

[dkarpele]

It's a "cherry-pick" of the approved PR argoproj-labs/argocd-operator#2356 from argocd-operator

What type of PR is this?

/kind bug

What does this PR do / why we need it:
Currently, the ArgoCD CR field (spec.tls.ca.secretName) exists and is exposed in the documentation. However, the operator's controller reconciliation logic does not actually consume this field. Instead, it relies on a hardcoded suffix pattern ({cr.name}-ca and {cr.name}-tls) to identify or generate the secrets used for internal component trust.

While the operator currently allows a workaround—exiting reconciliation early if a secret matching the hardcoded name already exists—this prevents integration with external secret managers (like cert-manager) that may require dynamic or pre-existing custom naming conventions.
This request is to fully implement the logic for spec.tls.ca.secretName (and related TLS secret fields) so that the operator actively honors user-specified secret names instead of defaulting strictly to the hardcoded naming convention.
Have you updated the necessary documentation?

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?
GITOPS-10660

Test acceptance criteria:

• Unit Test
• E2E Test

How to test changes / Special notes to the reviewer:

[openshift-ci]

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[coderabbitai]

📝 Summary

Summary by CodeRabbit

• New Features

  • Allow configuring a custom name for the Argo CD CA secret through TLS settings.
  • Preserve existing custom CA secrets when reconciling.
  • Prevent CA secret names from conflicting with the operator-managed cluster TLS secret.

• Bug Fixes

  • Keep CA ConfigMap certificate data synchronized after certificate rotation or updates.
  • Preserve unrelated user-defined ConfigMap entries during reconciliation.
  • Avoid unnecessary ConfigMap updates when managed values are already current.

Walkthrough

The operator now supports configured CA secret names, validates collisions with the cluster TLS secret, and uses the selected CA secret for TLS reconciliation. CA ConfigMaps refresh stale managed keys while preserving unrelated data and skipping no-op updates.

Changes

CA Secret Reconciliation

Layer / File(s)	Summary
CA secret naming and reconciliation argocd-operator/controllers/argocd/configmap.go, argocd-operator/controllers/argocd/secret.go, argocd-operator/controllers/argocd/configmap_test.go, argocd-operator/controllers/argocd/secret_test.go	CA secret creation and lookup use spec.tls.ca.secretName when set, or the default <ArgoCD name>-ca name. The operator rejects collisions with the cluster TLS secret. Tests cover default names, custom names, existing secrets, and name selection.
CA ConfigMap synchronization argocd-operator/controllers/argocd/configmap.go, argocd-operator/controllers/argocd/configmap_test.go	Reconciliation updates changed tls.crt and ca.crt values, preserves unrelated keys, and skips updates when managed values already match. Tests cover stale values, rotation, custom secret names, and no-op reconciliation.

Priority: ➖ Normal

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

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant ArgoCD
  participant CASecret
  participant CAConfigMap
  participant ClusterTLSSecret
  ArgoCD->>CASecret: derive configured or default name
  ArgoCD->>CASecret: create or read CA certificate and key
  ArgoCD->>CAConfigMap: synchronize tls.crt and ca.crt
  ArgoCD->>ClusterTLSSecret: use the derived CA secret for TLS reconciliation

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Suggested reviewers: jgwest

Merge Risk: 🟡 Moderate · up to b0ad3

Externally managed CA rotations can leave Argo CD using stale certificate data until another reconciliation occurs. Add the missing watch mapping before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: implementing support for the previously unconsumed spec.tls.ca.secretName field.
Description check	✅ Passed	The description directly explains the missing secretName reconciliation, the external secret manager use case, the related changes, and the test coverage.
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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[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@argocd-operator/controllers/argocd/configmap.go`:
- Line 359: Update the Secret-to-ArgoCD mapping used by reconcileCAConfigMap so
the configured CA Secret identified by getCASecretName is watched even when it
is an unowned external Secret, and ensure updates enqueue the owning ArgoCD. Add
or extend coverage to verify that rotating this Secret triggers reconciliation.

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ℹ️ Review info

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Run ID: 1d80acf4-cc29-4f56-ac97-30e1bb2a95e8

📥 Commits

Reviewing files that changed from the base of the PR and between 9e03b0a and b0ad3e5.

📒 Files selected for processing (4)

• argocd-operator/controllers/argocd/configmap.go
• argocd-operator/controllers/argocd/configmap_test.go
• argocd-operator/controllers/argocd/secret.go
• argocd-operator/controllers/argocd/secret_test.go

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• argoproj-labs/argocd-operator (manual) → reviewed against open PR #2356 dk-gitops-10308 instead of the default branch

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[openshift-ci]

@dkarpele: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v4.14-kuttl-parallel	b0ad3e5	link	false	/test v4.14-kuttl-parallel
ci/prow/v4.14-e2e	b0ad3e5	link	false	/test v4.14-e2e

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