Stop using deprecated ioutil functions

api/internal/builtins/HelmChartInflationGenerator.go

@@ -6,7 +6,6 @@ package builtins
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -73,7 +72,7 @@ func (p *HelmChartInflationGeneratorPlugin) establishTmpDir() (err error) {
 		// already done.
 		return nil
 	}
-	p.tmpDir, err = ioutil.TempDir("", "kustomize-helm-")
+	p.tmpDir, err = os.MkdirTemp("", "kustomize-helm-")
 	return err
 }
 
@@ -211,7 +210,7 @@ func (p *HelmChartInflationGeneratorPlugin) writeValuesBytes(
 		return "", fmt.Errorf("cannot create tmp dir to write helm values")
 	}
 	path := filepath.Join(p.tmpDir, p.Name+"-kustomize-values.yaml")
-	return path, ioutil.WriteFile(path, b, 0644)
+	return path, os.WriteFile(path, b, 0644)
 }
 
 func (p *HelmChartInflationGeneratorPlugin) cleanup() {

api/internal/plugins/execplugin/execplugin.go

@@ -6,7 +6,6 @@ package execplugin
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"runtime"
@@ -150,7 +149,7 @@ func (p *ExecPlugin) Transform(rm resmap.ResMap) error {
 // passes the full temp file path as the first arg to a process
 // running the plugin binary.  Process output is returned.
 func (p *ExecPlugin) invokePlugin(input []byte) ([]byte, error) {
-	f, err := ioutil.TempFile("", tmpConfigFilePrefix)
+	f, err := os.CreateTemp("", tmpConfigFilePrefix)
 	if err != nil {
 		return nil, errors.Wrap(
 			err, "creating tmp plugin config file")

api/krusty/openapitests/openapicustomschema_test.go

@@ -7,7 +7,6 @@ package openapitests //nolint
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -18,12 +17,12 @@ import (
 )
 
 func writeTestSchema(th kusttest_test.Harness, filepath string) {
-	bytes, _ := ioutil.ReadFile("../testdata/customschema.json")
+	bytes, _ := os.ReadFile("../testdata/customschema.json")
 	th.WriteF(filepath+"mycrd_schema.json", string(bytes))
 }
 
 func writeTestSchemaYaml(th kusttest_test.Harness, filepath string) {
-	bytes, _ := ioutil.ReadFile("../testdata/customschema.yaml")
+	bytes, _ := os.ReadFile("../testdata/customschema.yaml")
 	th.WriteF(filepath+"mycrd_schema.yaml", string(bytes))
 }
 
@@ -486,7 +485,7 @@ spec:
 `)
 
 		// openapi schema referred to by the component
-		bytes, _ := ioutil.ReadFile("../testdata/openshiftschema.json")
+		bytes, _ := os.ReadFile("../testdata/openshiftschema.json")
 		th.WriteF("components/dc-openapi/openapi.json", string(bytes))
 
 		// patch referred to by the component

api/loader/fileloader.go

@@ -5,7 +5,7 @@ package loader
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"net/url"
@@ -302,7 +302,7 @@ func (fl *fileLoader) Load(path string) ([]byte, error) {
 			}
 			return nil, fmt.Errorf("%w: status code %d (%s)", ErrHTTP, resp.StatusCode, http.StatusText(resp.StatusCode))
 		}
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return nil, err
 		}

api/loader/fileloader_test.go

@@ -5,7 +5,7 @@ package loader
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"os"
 	"path"
@@ -518,7 +518,7 @@ func TestLoaderHTTP(t *testing.T) {
 			require.Equal(x.path, u)
 			return &http.Response{
 				StatusCode: 200,
-				Body:       ioutil.NopCloser(bytes.NewBufferString(x.expectedContent)),
+				Body:       io.NopCloser(bytes.NewBufferString(x.expectedContent)),
 				Header:     make(http.Header),
 			}
 		})

api/testutils/kusttest/harnessenhanced.go

@@ -4,7 +4,6 @@
 package kusttest_test
 
 import (
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -61,7 +60,7 @@ func MakeEnhancedHarnessWithTmpRoot(t *testing.T) *HarnessEnhanced {
 	r := makeBaseEnhancedHarness(t)
 	fSys := filesys.MakeFsOnDisk()
 	r.Harness = MakeHarnessWithFs(t, fSys)
-	tmpDir, err := ioutil.TempDir("", "kust-testing-")
+	tmpDir, err := os.MkdirTemp("", "kust-testing-")
 	if err != nil {
 		panic("test harness cannot make tmp dir: " + err.Error())
 	}