CNF-23046: Migrate away from deprecated ioutil

[sebrandon1]

ioutil has been deprecated since Go 1.16: https://go.dev/doc/go1.16#ioutil

Tracking issue: redhat-best-practices-for-k8s/telco-bot#52

Summary by CodeRabbit

• Chores
  • Replaced deprecated file I/O usage with modern standard library calls to remove legacy dependencies and improve maintainability; no user-facing behavior changes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: openshift/coderabbit/.coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 8a240b6c-04e4-43ea-9ff2-9b4eead8b63b

📥 Commits

Reviewing files that changed from the base of the PR and between fd07510 and 7230d43.

📒 Files selected for processing (2)

• pkg/cmd/render/render.go
• pkg/operator/kube_cloud_config/bootstrap.go

🚧 Files skipped from review as they are similar to previous changes (1)

• pkg/operator/kube_cloud_config/bootstrap.go

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Walkthrough

Replaced uses of the deprecated io/ioutil package with the os equivalents: ioutil.ReadFile → os.ReadFile and ioutil.WriteFile → os.WriteFile. Imports updated to remove io/ioutil. No changes to control flow, error handling, or exported declarations.

Changes

I/O API modernization

Layer / File(s)	Summary
Imports pkg/cmd/render/render.go, pkg/operator/kube_cloud_config/bootstrap.go	Removed io/ioutil import and added os where needed.
Read calls pkg/cmd/render/render.go, pkg/operator/kube_cloud_config/bootstrap.go	Replaced ioutil.ReadFile(...) with os.ReadFile(...) for cluster, infrastructure, and cloud provider reads; error handling unchanged.
Write calls pkg/cmd/render/render.go	Replaced ioutil.WriteFile(...) with os.WriteFile(...) for writing generated cloud provider config; error handling unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 12

✅ Passed checks (12 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'CNF-23046: Migrate away from deprecated ioutil' clearly and specifically summarizes the main change across both modified files.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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.
Stable And Deterministic Test Names	✅ Passed	The custom check for stable and deterministic Ginkgo test names is not applicable to this PR. The repository uses standard Go testing, not Ginkgo, and this PR makes no test file changes.
Test Structure And Quality	✅ Passed	Custom check is not applicable. PR only modifies production code files (render.go, bootstrap.go) to migrate from deprecated ioutil package. No Ginkgo test code is present or modified.
Microshift Test Compatibility	✅ Passed	This PR does not add any new Ginkgo e2e tests. It only updates two production files to replace deprecated ioutil functions with os equivalents. The MicroShift compatibility check is not applicable.
Single Node Openshift (Sno) Test Compatibility	✅ Passed	The PR does not add any Ginkgo e2e tests. Changes are only to non-test source files for ioutil deprecation migration. The SNO test compatibility check is not applicable.
Topology-Aware Scheduling Compatibility	✅ Passed	PR replaces deprecated ioutil calls with os package. No scheduling constraints or topology-related changes. Check not applicable.
Ote Binary Stdout Contract	✅ Passed	Changes replace deprecated ioutil with os equivalents in non-entry-point functions. No new process-level stdout writes introduced. Error handling and control flow unchanged.
Ipv6 And Disconnected Network Test Compatibility	✅ Passed	This PR refactors existing production code to replace deprecated ioutil calls with os equivalents. No new Ginkgo e2e tests are added, making this check not applicable.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sebrandon1
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[sebrandon1]

/retest

[openshift-ci-robot]

@sebrandon1: This pull request references CNF-23046 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "5.0.0" version, but no target version was set.

Details

In response to this:

ioutil has been deprecated since Go 1.16: https://go.dev/doc/go1.16#ioutil

Tracking issue: redhat-best-practices-for-k8s/telco-bot#52

Summary by CodeRabbit

• Chores
• Modernized internal code by updating file I/O operations to use current standard library APIs, removing usage of deprecated functions and improving codebase maintainability.

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[sebrandon1]

/retest

[sebrandon1]

/retest

[openshift-ci]

@sebrandon1: The following test 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/e2e-aws-ovn-techpreview	7230d43	link	true	/test e2e-aws-ovn-techpreview

Full PR test history. Your PR dashboard.

Details

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