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
  • Modernized internal file I/O to remove deprecated APIs and align with current standard library usage, improving maintainability and long-term reliability without changing user-facing behavior.

[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: 90f06163-559d-428c-b4ac-d8a1cdbf351f

📥 Commits

Reviewing files that changed from the base of the PR and between 11b7f09 and fd07510.

📒 Files selected for processing (2)

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

✅ Files skipped from review due to trivial changes (2)

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

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Walkthrough

Replaced deprecated ioutil.ReadFile/ioutil.WriteFile calls with os.ReadFile/os.WriteFile and removed io/ioutil imports. No functional changes to control flow, error handling, or exported declarations.

Changes

Cohort / File(s)	Summary
I/O API modernization pkg/cmd/render/render.go, pkg/operator/kube_cloud_config/bootstrap.go	Replaced ioutil.ReadFile/ioutil.WriteFile with os.ReadFile/os.WriteFile and removed io/ioutil imports. Error handling and control flow unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 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 directly and clearly describes the main change: migrating away from deprecated ioutil package to use standard library equivalents.
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 pull request only modifies production code files to migrate from deprecated ioutil to os functions. No test files are modified.
Test Structure And Quality	✅ Passed	PR modifies only application source files with no Ginkgo test files added, modified, or removed, so test quality requirements are not applicable.
Microshift Test Compatibility	✅ Passed	This check is not applicable to this pull request. The custom check specifically applies to when new Ginkgo e2e tests are added, but this PR contains no new tests whatsoever. The changes are purely in non-test utility files that update deprecated file I/O function calls from the ioutil package to their modern os package equivalents.
Single Node Openshift (Sno) Test Compatibility	✅ Passed	PR only updates internal library code to migrate from deprecated io/ioutil functions to standard library equivalents; no new Ginkgo e2e tests are added.
Topology-Aware Scheduling Compatibility	✅ Passed	PR contains only refactoring changes migrating deprecated ioutil operations to os equivalents with no impact on scheduling constraints, affinity rules, node selectors, replica counts, or topology-aware logic.
Ote Binary Stdout Contract	✅ Passed	PR replaces deprecated ioutil functions with modern os equivalents in library utility functions without violating OTE Binary Stdout Contract.
Ipv6 And Disconnected Network Test Compatibility	✅ Passed	This pull request does not add any new Ginkgo e2e tests. The modified files contain no test declarations, Ginkgo imports, or test-related code, only utility/operational changes.

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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.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[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-serial-techpreview-2of2	fd07510	link	true	/test e2e-aws-serial-techpreview-2of2

Full PR test history. Your PR dashboard.

Details

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