Tracking Deprecated io/ioutil Package Usage

[sebrandon1]

Deprecated io/ioutil Usage Report

Last Updated: 2025-12-02 08:01:42 UTC
Replacement: Use io and os packages
Reference: Go 1.16 Release Notes

Summary

• Total Repositories Scanned: 536
• Repositories Skipped (forks): 0
• Repositories Skipped (abandoned - no commits in 6 months): 200
• Repositories Skipped (non-Go): 7
• Repositories Actually Checked: 329
• Repositories Using Deprecated io/ioutil: 41
• Usage Percentage: 12.5%

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openshift

Repositories Using Deprecated io/ioutil: 38

Repository	Branch	Last Updated	PR Status	Needs Rebase?
zero-trust-workload-identity-manager	main	2025-12-02	—	—
ci-tools	main	2025-12-02	🔄 #4852	✅ No
origin	main	2025-12-01	—	—
oauth-server	master	2025-12-01	🔄 #202	⚠️ Yes
microshift	main	2025-12-01	—	—
oc-mirror	main	2025-12-01	—	—
oc	main	2025-12-01	—	—
rosa	master	2025-12-01	—	—
cert-manager-operator	master	2025-12-01	❌ #354	✅ No
cluster-baremetal-operator	main	2025-11-30	—	—
cluster-openshift-controller-manager-operator	master	2025-11-28	🔄 #401	✅ No
operator-framework-operator-controller	main	2025-11-28	—	—
cluster-kube-apiserver-operator	main	2025-11-28	🔄 #1971	✅ No
cluster-authentication-operator	master	2025-11-27	—	—
api	master	2025-11-27	🔄 #2603	✅ No
baremetal-runtimecfg	main	2025-11-26	🔄 #373	⚠️ Yes
ptp-operator	main	2025-11-26	🔄 #642	✅ No
cluster-kube-scheduler-operator	main	2025-11-26	—	—
cluster-samples-operator	main	2025-11-26	🔄 #668	✅ No
service-ca-operator	main	2025-11-25	🔄 #292	✅ No
console-operator	main	2025-11-24	🔄 #1072	✅ No
cluster-ingress-operator	master	2025-11-22	—	—
cluster-dns-operator	master	2025-11-21	🔄 #454	✅ No
cluster-api-actuator-pkg	master	2025-11-21	—	—
oadp-operator	oadp-dev	2025-11-21	🔄 #2036	✅ No
file-integrity-operator	master	2025-11-20	🔄 #803	✅ No
machine-api-provider-azure	main	2025-11-17	—	—
cluster-machine-approver	main	2025-11-12	🔄 #284	✅ No
apiserver-library-go	master	2025-11-05	🔄 #156	✅ No
ocp-release-operator-sdk	main	2025-10-20	—	—
openshift-controller-manager	master	2025-10-20	🔄 #422	✅ No
cluster-bootstrap	main	2025-10-17	🔄 #123	✅ No
multus-admission-controller	main	2025-10-17	—	—
generic-admission-server	master	2025-10-17	🔄 #57	✅ No
csi-driver-manila-operator	master	2025-10-07	—	—
cluster-openshift-apiserver-operator	main	2025-10-06	—	—
azure-service-operator	main	2025-10-01	—	—
content-mirror	main	2025-08-18	🔄 #14	✅ No

openshift-kni

Repositories Using Deprecated io/ioutil: 3

Repository	Branch	Last Updated	PR Status	Needs Rebase?
cluster-group-upgrades-operator	main	2025-12-01	—	—
lifecycle-agent	main	2025-12-01	—	—
debug-tools	main	2025-11-20	🔄 #102	✅ No

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What to Do

The io/ioutil package was deprecated in Go 1.16 (February 2021) and its functionality has been moved to the io and os packages.

Migration Guide

The following table shows the replacements for deprecated io/ioutil functions:

Deprecated (io/ioutil)	Replacement	Package
ioutil.Discard	io.Discard	io
ioutil.NopCloser	io.NopCloser	io
ioutil.ReadAll	io.ReadAll	io
ioutil.ReadDir	os.ReadDir	os
ioutil.ReadFile	os.ReadFile	os
ioutil.TempDir	os.MkdirTemp	os
ioutil.TempFile	os.CreateTemp	os
ioutil.WriteFile	os.WriteFile	os

Migration Steps

1. Update import statements:

   // Remove this:
   import "io/ioutil"
   
   // Add these as needed:
   import "io"
   import "os"

2. Replace function calls:

   // Example: ReadFile
   data, err := ioutil.ReadFile("file.txt")  // Old
   data, err := os.ReadFile("file.txt")     // New

3. Run tests:

   go test ./...

Resources

• Go 1.16 Release Notes
• io package documentation
• os package documentation

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This issue is automatically updated by the ioutil-deprecation-checker.sh script.