feat: support acknowledged source namespace deletion

[tmshort]

Summary

Adds an explicit, opt-in path to delete the source namespace after a successful cross-namespace migration.

• Adds --acknowledge-namespace-delete and rejects unsafe flag combinations.
• Records the acknowledgment on the ClusterExtension.
• Deletes the source namespace only after target installation and OLMv0 cleanup.
• Extends dry-run and unit-test coverage for the destructive action.

Validation

• go test ./migration/... -count=1

Summary by CodeRabbit

• New Features
  • Cross-namespace migrations can now delete the source namespace after cleanup when deletion is explicitly acknowledged. Without acknowledgment, the namespace is retained.
  • Dry-run plans indicate whether the source namespace will be deleted or retained.
  • The migration records the deletion acknowledgment in the resulting extension.
• Bug Fixes
  • Namespace deletion errors are reported, while a source namespace that is already absent does not cause the migration to fail.

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Review configuration:

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: b6b9afb2-67e1-4c1d-a3d3-98400e69cfe4

📥 Commits

Reviewing files that changed from the base of the PR and between 428c855 and 99fa9c6.

📒 Files selected for processing (5)

• migration/examples/cmd/migrate-operators-v0-to-v1/convert.go
• migration/examples/cmd/migrate-operators-v0-to-v1/convert_test.go
• migration/pkg/migration/migration.go
• migration/pkg/migration/scan.go
• migration/pkg/migration/unit_test.go

📝 Walkthrough

Walkthrough

The migration command and package now support an explicit acknowledgment to delete the source namespace after OLMv0 cleanup. The migration records the acknowledgment on the ClusterExtension, and the dry-run plan reports whether the source namespace will be deleted or retained.

Changes

Source namespace deletion

Layer / File(s)	Summary
Acknowledgment option and command handling migration/pkg/migration/types.go, migration/examples/cmd/migrate-operators-v0-to-v1/convert.go, migration/examples/cmd/migrate-operators-v0-to-v1/convert_test.go	The options and command handle the acknowledgment flag, reject it for --all and when install and subscription namespaces match, and update the dry-run cleanup plan and its test.
Namespace deletion after cleanup migration/pkg/migration/namespace.go, migration/pkg/migration/migration.go, migration/examples/cmd/migrate-operators-v0-to-v1/convert.go, migration/pkg/migration/unit_test.go	The migration records the acknowledgment on the ClusterExtension and requests source namespace deletion after cleanup when applicable. Tests cover acknowledged and unacknowledged deletion, and a persisted ClusterExtension when creation returns an error.

Priority: ⬇️ Low

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

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant ConvertCommand
  participant Migrator
  participant KubernetesClient
  ConvertCommand->>Migrator: pass namespace deletion acknowledgment
  ConvertCommand->>Migrator: call DeleteSourceNamespace after OLMv0 cleanup
  Migrator->>KubernetesClient: delete source namespace when acknowledged and namespaces differ

Loading

Merge Risk: 🟡 Moderate · up to 428c8

An acknowledged migration could remove Secrets needed by installed operators. Prevent deletion of the system namespace before merging, and correct the dry-run preview so it describes the resources that will be removed.

Security Architecture Review

Security architecture risk: 🟠 High · up to 428c8

An explicitly authorized migration can now delete an entire namespace, not just the operator resources being moved. The deletion could affect unrelated workloads or the namespace used by the operator controller. The opt-in flag and installation checks reduce accidental exposure, but they do not establish that the namespace is safe to remove.

Retained concerns

• High · security · inferred: Acknowledgment authorizes deletion of the whole source namespace even though migration collects and moves only selected operator resources. Unrelated namespace contents can therefore be lost without a namespace-ownership or contents check.
• High · security · inferred: The deletion gate does not exclude a source namespace equal to SystemNamespace. In that configuration it can request deletion of the operator-controller namespace and the reference Secrets used by the migrated ClusterObjectSet.

Security review details

Security Blast Radius

• inferred — Each acknowledged invocation targets one named source namespace, but the resulting delete is broader than the migrated operator's resources. If that name is the operator-controller namespace, the potential effect extends to controller workloads and ClusterObjectSet reference Secrets.

Security Findings and Attack Paths

• inferred — A caller able to choose the source namespace, opt in, complete an eligible migration, and use a Kubernetes client authorized to delete Namespaces can cause loss of unrelated source-namespace contents. No path for a caller lacking those privileges was established.

Trust Boundaries and Controls

• observed — The CLI defaults the flag off, disallows bulk use, and requires different namespace names. The library's delete gate checks acknowledgment and name inequality, then relies on the supplied Kubernetes client's authorization; it does not validate namespace ownership or exclude SystemNamespace.

Resilience and Maintainability Implications

• inferred — The new delete returns after its API request without verifying namespace removal. Combined with the existing refusal to rerun against an existing ClusterExtension, finalization delays or post-install errors require an operational recovery path not demonstrated here.

Hardening Proposals

• proposed — Before requesting deletion, require an explicit namespace-ownership or emptiness policy, reject the discovered system namespace, and bind the request to the source Namespace UID observed during preparation. Define how operators verify completion and recover when deletion fails or remains pending.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 18.18% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly and concisely describes the main change: opt-in support for acknowledged source namespace deletion.
Description check	✅ Passed	The description explains the feature, key implementation changes, and validation command. It does not include the template's reviewer checklist or a related issue link, but it provides the main requir…

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Commit to this branch
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Actionable comments posted: 2

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at
@migration/examples/cmd/migrate-operators-v0-to-v1/convert.go:
- Around line 427-428: Update the acknowledged-deletion step in the dry-run plan
built by the conversion flow to state that deleting the source namespace also
removes remaining InstallPlans and OperatorGroups. Keep the existing namespace
and acknowledgment flag in the message.

Review comments at @migration/pkg/migration/namespace.go:
- Around line 429-430: Update the namespace deletion guards so migration rejects
a SubscriptionNamespace that equals the resolved SystemNamespace before changing
any resources, even when InstallNamespace differs. Locate the migration flow
around the AcknowledgeNamespaceDelete and InstallNamespace checks, and preserve
the existing behavior for other namespace combinations.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: a21484f8-2293-4cb1-9e2a-cecb0a115bd6

📥 Commits

Reviewing files that changed from the base of the PR and between a586565 and 428c855.

📒 Files selected for processing (6)

• migration/examples/cmd/migrate-operators-v0-to-v1/convert.go
• migration/examples/cmd/migrate-operators-v0-to-v1/convert_test.go
• migration/pkg/migration/migration.go
• migration/pkg/migration/namespace.go
• migration/pkg/migration/types.go
• migration/pkg/migration/unit_test.go

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[Leo6Leo]

For example:

1. Migrate widgets from operators to widget-system with --acknowledge-namespace-delete.
2. After operators is deleted, run rollback widgets --acknowledge-installed.
3. Rollback requests deletion of the CE and COS, then fails to restore the Subscription with namespaces "operators" not found.

This leaves OLMv0 unrestored while the OLMv1 management objects, including the CE’s backup annotations, are being deleted.

[tmshort]

Addressed in 99fa9c6. Rollback now verifies the original Subscription namespace exists before deleting the ClusterExtension or ClusterObjectSet. If it was intentionally deleted during migration, rollback returns a clear preflight error and preserves the OLMv1 objects and their authoritative backup annotations.

[Leo6Leo]

/lgtm

[tmshort]

/approve

[openshift-ci]

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