Stop using deprecated ioutil functions

kyaml/fn/runtime/runtimeutil/runtimeutil.go

@@ -7,7 +7,7 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
+	"os"
 	"path"
 	"strings"
 
@@ -268,7 +268,7 @@ func (c *FunctionFilter) doResults(r *kio.ByteReader) error {
 		if err != nil {
 			return err
 		}
-		err = ioutil.WriteFile(c.ResultsFile, []byte(results), 0600)
+		err = os.WriteFile(c.ResultsFile, []byte(results), 0600)
 		if err != nil {
 			return err
 		}

kyaml/fn/runtime/runtimeutil/runtimeutil_test.go

@@ -6,7 +6,6 @@ package runtimeutil
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -24,7 +23,7 @@ type testRun struct {
 
 func (r testRun) run(reader io.Reader, writer io.Writer) error {
 	if r.expectedInput != "" {
-		input, err := ioutil.ReadAll(reader)
+		input, err := io.ReadAll(reader)
 		if !assert.NoError(r.t, err) {
 			r.t.FailNow()
 		}
@@ -1040,7 +1039,7 @@ metadata:
 			// results file setup
 			if len(tt.expectedResults) > 0 && !tt.noMakeResultsFile {
 				// expect result files to be written -- create a directory for them
-				f, err := ioutil.TempFile("", "test-kyaml-*.yaml")
+				f, err := os.CreateTemp("", "test-kyaml-*.yaml")
 				if !assert.NoError(t, err) {
 					t.FailNow()
 				}
@@ -1123,7 +1122,7 @@ metadata:
 					t.FailNow()
 				}
 
-				b, err := ioutil.ReadFile(tt.instance.ResultsFile)
+				b, err := os.ReadFile(tt.instance.ResultsFile)
 				writtenResults := strings.TrimSpace(string(b))
 				if !assert.NoError(t, err) {
 					t.FailNow()

kyaml/fn/runtime/starlark/example_test.go

@@ -6,7 +6,6 @@ package starlark_test
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -200,13 +199,13 @@ run(ctx.resource_list["items"], ctx.resource_list["functionConfig"]["spec"]["val
 // resource configuration read from a directory.
 func ExampleFilter_Filter_file() {
 	// setup the configuration
-	d, err := ioutil.TempDir("", "")
+	d, err := os.MkdirTemp("", "")
 	if err != nil {
 		log.Println(err)
 	}
 	defer os.RemoveAll(d)
 
-	err = ioutil.WriteFile(filepath.Join(d, "deploy1.yaml"), []byte(`
+	err = os.WriteFile(filepath.Join(d, "deploy1.yaml"), []byte(`
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -222,7 +221,7 @@ spec:
 		log.Println(err)
 	}
 
-	err = ioutil.WriteFile(filepath.Join(d, "deploy2.yaml"), []byte(`
+	err = os.WriteFile(filepath.Join(d, "deploy2.yaml"), []byte(`
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -238,7 +237,7 @@ spec:
 		log.Println(err)
 	}
 
-	err = ioutil.WriteFile(filepath.Join(d, "annotate.star"), []byte(`
+	err = os.WriteFile(filepath.Join(d, "annotate.star"), []byte(`
 def run(items):
   for item in items:
     item["metadata"]["annotations"]["foo"] = "bar"

kyaml/fn/runtime/starlark/starlark.go

@@ -7,8 +7,8 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
+	"os"
 
 	"go.starlark.net/starlark"
 	"sigs.k8s.io/kustomize/kyaml/errors"
@@ -57,7 +57,7 @@ func (sf *Filter) setup() error {
 
 	// read the program from a file
 	if sf.Path != "" {
-		b, err := ioutil.ReadFile(sf.Path)
+		b, err := os.ReadFile(sf.Path)
 		if err != nil {
 			return err
 		}
@@ -72,7 +72,7 @@ func (sf *Filter) setup() error {
 				return err
 			}
 			defer resp.Body.Close()
-			b, err := ioutil.ReadAll(resp.Body)
+			b, err := io.ReadAll(resp.Body)
 			if err != nil {
 				return err
 			}