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 calls with modern standard library equivalents to remove a legacy dependency and improve maintainability; internal-only change with no user-facing behavior differences.

[coderabbitai]

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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 & render updates pkg/cmd/render/render.go	Removed io/ioutil import; replaced ioutil.ReadFile(...) with os.ReadFile(...) and ioutil.WriteFile(...) with os.WriteFile(...) in the render command; behavior and error handling unchanged.
Bootstrap transform updates pkg/operator/kube_cloud_config/bootstrap.go	Removed io/ioutil import; replaced ioutil.ReadFile(...) with os.ReadFile(...) for infrastructure and optional cloud provider file reads; behavior and error handling unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 15

✅ Passed checks (15 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically identifies the main change: migrating away from the deprecated ioutil package, which is the primary focus across all 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	PR modifies only production code files (render.go and bootstrap.go). These are not test files and don't contain Ginkgo tests, so the test naming check is not applicable.
Test Structure And Quality	✅ Passed	PR only modifies production code (render.go, bootstrap.go) replacing deprecated ioutil with os APIs; no Ginkgo test files modified, so test quality check is not applicable.
Microshift Test Compatibility	✅ Passed	PR does not add new Ginkgo e2e tests; changes are only code refactoring in non-test files, replacing deprecated ioutil calls with os equivalents.
Single Node Openshift (Sno) Test Compatibility	✅ Passed	PR adds no new Ginkgo e2e tests. Changes are code refactoring to remove deprecated ioutil imports (production code only), making the SNO compatibility check not applicable.
Topology-Aware Scheduling Compatibility	✅ Passed	PR only removes deprecated io/ioutil imports and updates file I/O to os.ReadFile/WriteFile. No deployment manifests, controllers, or scheduling constraints are added or modified.
Ote Binary Stdout Contract	✅ Passed	PR only replaces deprecated ioutil with os equivalents for file I/O; makes no changes to process-level code or stdout writes, so cannot violate OTE Binary Stdout Contract.
Ipv6 And Disconnected Network Test Compatibility	✅ Passed	No new Ginkgo e2e tests added. PR only refactors file I/O in two utility modules to replace deprecated ioutil with os equivalents.
No-Weak-Crypto	✅ Passed	The PR only modifies file I/O operations (replacing deprecated ioutil with os package), containing no weak cryptographic algorithms, custom crypto, or insecure secret comparisons.
Container-Privileges	✅ Passed	PR only modifies Go source files (ioutil deprecation migration), not container/K8s manifests. Container privilege check is not applicable to Go code changes.
No-Sensitive-Data-In-Logs	✅ Passed	The PR replaces deprecated ioutil with os functions without changing error handling. Error messages only log file paths and OS errors, not sensitive content or credentials.

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✨ Finishing Touches

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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: all tests passed!

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