storage: stop using deprecated io/ioutil

[skitt]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This replaces deprecated ioutil variables and functions as follows:

• ioutil.ReadDir -> os.ReadDir
• ioutil.ReadFile -> os.ReadFile
• ioutil.TempDir -> os.MkdirTemp
• ioutil.TempFile -> os.CreateTemp
• ioutil.WriteFile -> os.WriteFile

The ReadDir conversion involves an API change, the replacement function returns a slice of fs.DirEntry instead of fs.FileInfo. Where appropriate, the surrounding code has been adjusted; mostly, that means using DirEntry.Type() instead of FileInfo.Mode(). Applying this change to the IoUtil interface would mean changing its API, so this is left for later.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @skitt. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[gnufied]

/ok-to-test

[skitt]

/test pull-kubernetes-e2e-storage-kind-disruptive

[skitt]

/test pull-kubernetes-e2e-storage-kind-disruptive

[gnufied]

Looks good to me. @kubernetes/sig-storage-bugs

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: e43457cdcd94a3fa37606b8addc56669f96e7791

[gnufied]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gnufied, skitt

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• pkg/volume/OWNERS [gnufied]

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[k8s-ci-robot]

@skitt: 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
pull-kubernetes-e2e-gce	ab75e48	link	unknown	/test pull-kubernetes-e2e-gce

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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 kubernetes/test-infra repository. I understand the commands that are listed here.

[xing-yang]

/retest