cleanup io/ioutil

Signed-off-by: cndoit18 <cndoit18@outlook.com>

examples/scratch-env/main.go

@@ -18,7 +18,6 @@ package main
 
 import (
 	goflag "flag"
-	"io/ioutil"
 	"os"
 
 	flag "github.com/spf13/pflag"
@@ -83,7 +82,7 @@ func runMain() int {
 	}
 
 	// TODO(directxman12): add support for writing to a new context in an existing file
-	kubeconfigFile, err := ioutil.TempFile("", "scratch-env-kubeconfig-")
+	kubeconfigFile, err := os.CreateTemp("", "scratch-env-kubeconfig-")
 	if err != nil {
 		log.Error(err, "unable to create kubeconfig file, continuing on without it")
 		return 1

pkg/client/config/config_test.go

@@ -17,7 +17,6 @@ limitations under the License.
 package config
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -45,7 +44,7 @@ var _ = Describe("Config", func() {
 	BeforeEach(func() {
 		// create temporary directory for test case
 		var err error
-		dir, err = ioutil.TempDir("", "cr-test")
+		dir, err = os.MkdirTemp("", "cr-test")
 		Expect(err).NotTo(HaveOccurred())
 
 		// override $HOME/.kube/config
@@ -192,7 +191,7 @@ func setConfigs(tc testCase, dir string) {
 
 func createFiles(files map[string]string, dir string) error {
 	for path, data := range files {
-		if err := ioutil.WriteFile(filepath.Join(dir, path), []byte(data), 0644); err != nil { //nolint:gosec
+		if err := os.WriteFile(filepath.Join(dir, path), []byte(data), 0600); err != nil {
 			return err
 		}
 	}

pkg/config/config.go

@@ -18,7 +18,7 @@ package config
 
 import (
 	"fmt"
-	ioutil "io/ioutil"
+	"os"
 	"sync"
 
 	"k8s.io/apimachinery/pkg/runtime"
@@ -96,7 +96,7 @@ func (d *DeferredFileLoader) loadFile() {
 		return
 	}
 
-	content, err := ioutil.ReadFile(d.path)
+	content, err := os.ReadFile(d.path)
 	if err != nil {
 		d.err = fmt.Errorf("could not read file at %s", d.path)
 		return

pkg/envtest/crd.go

@@ -339,6 +339,9 @@ func renderCRDs(options *CRDInstallOptions) ([]client.Object, error) {
 
 		if !info.IsDir() {
 			filePath, files = filepath.Dir(path), []os.FileInfo{info}
+
+			// TODO: Migrate to os.ReadDir
+			// information: https://go-review.googlesource.com/c/go/+/293649/
 		} else if files, err = ioutil.ReadDir(path); err != nil {
 			return nil, err
 		}
@@ -602,7 +605,7 @@ func readCRDs(basePath string, files []os.FileInfo) ([]*unstructured.Unstructure
 
 // readDocuments reads documents from file.
 func readDocuments(fp string) ([][]byte, error) {
-	b, err := ioutil.ReadFile(fp) //nolint:gosec
+	b, err := os.ReadFile(fp)
 	if err != nil {
 		return nil, err
 	}

pkg/envtest/webhook.go

@@ -275,7 +275,7 @@ func (o *WebhookInstallOptions) setupCA() error {
 		return fmt.Errorf("unable to set up webhook serving certs: %v", err)
 	}
 
-	localServingCertsDir, err := ioutil.TempDir("", "envtest-serving-certs-")
+	localServingCertsDir, err := os.MkdirTemp("", "envtest-serving-certs-")
 	o.LocalServingCertDir = localServingCertsDir
 	if err != nil {
 		return fmt.Errorf("unable to create directory for webhook serving certs: %v", err)
@@ -286,10 +286,10 @@ func (o *WebhookInstallOptions) setupCA() error {
 		return fmt.Errorf("unable to marshal webhook serving certs: %v", err)
 	}
 
-	if err := ioutil.WriteFile(filepath.Join(localServingCertsDir, "tls.crt"), certData, 0640); err != nil { //nolint:gosec
+	if err = os.WriteFile(filepath.Join(localServingCertsDir, "tls.crt"), certData, 0600); err != nil {
 		return fmt.Errorf("unable to write webhook serving cert to disk: %v", err)
 	}
-	if err := ioutil.WriteFile(filepath.Join(localServingCertsDir, "tls.key"), keyData, 0640); err != nil { //nolint:gosec
+	if err = os.WriteFile(filepath.Join(localServingCertsDir, "tls.key"), keyData, 0600); err != nil {
 		return fmt.Errorf("unable to write webhook serving key to disk: %v", err)
 	}
 
@@ -375,6 +375,9 @@ func readWebhooks(path string) ([]client.Object, []client.Object, error) {
 	}
 	if !info.IsDir() {
 		path, files = filepath.Dir(path), []os.FileInfo{info}
+
+		// TODO: Migrate to os.ReadDir
+		// information: https://go-review.googlesource.com/c/go/+/293649/
 	} else if files, err = ioutil.ReadDir(path); err != nil {
 		return nil, nil, err
 	}

pkg/leaderelection/leader_election.go

@@ -19,7 +19,6 @@ package leaderelection
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 
 	"k8s.io/apimachinery/pkg/util/uuid"
@@ -111,7 +110,7 @@ func getInClusterNamespace() (string, error) {
 	}
 
 	// Load the namespace file and return its content
-	namespace, err := ioutil.ReadFile(inClusterNamespacePath)
+	namespace, err := os.ReadFile(inClusterNamespacePath)
 	if err != nil {
 		return "", fmt.Errorf("error reading namespace file: %w", err)
 	}

pkg/manager/manager_test.go

@@ -20,7 +20,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http"
 	"path"
@@ -1129,7 +1129,7 @@ var _ = Describe("manger.Manager", func() {
 				Expect(err).NotTo(HaveOccurred())
 				Expect(resp.StatusCode).To(Equal(200))
 
-				data, err := ioutil.ReadAll(resp.Body)
+				data, err := io.ReadAll(resp.Body)
 				Expect(err).NotTo(HaveOccurred())
 				Expect(string(data)).To(ContainSubstring("%s\n%s\n%s\n",
 					`# HELP test_one test metric for testing`,
@@ -1170,7 +1170,7 @@ var _ = Describe("manger.Manager", func() {
 				Expect(err).NotTo(HaveOccurred())
 				Expect(resp.StatusCode).To(Equal(http.StatusOK))
 
-				body, err := ioutil.ReadAll(resp.Body)
+				body, err := io.ReadAll(resp.Body)
 				Expect(err).NotTo(HaveOccurred())
 				Expect(string(body)).To(Equal("Some debug info"))
 			})

pkg/webhook/admission/http.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 
 	v1 "k8s.io/api/admission/v1"
@@ -60,7 +59,7 @@ func (wh *Webhook) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 
 	defer r.Body.Close()
-	if body, err = ioutil.ReadAll(r.Body); err != nil {
+	if body, err = io.ReadAll(r.Body); err != nil {
 		wh.log.Error(err, "unable to read the body from the incoming request")
 		reviewResponse = Errored(http.StatusBadRequest, err)
 		wh.writeResponse(w, reviewResponse)

pkg/webhook/conversion/conversion_test.go

@@ -19,7 +19,7 @@ package conversion
 import (
 	"bytes"
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 
@@ -70,7 +70,7 @@ var _ = Describe("Conversion Webhook", func() {
 
 		convReview := &apix.ConversionReview{}
 		req := &http.Request{
-			Body: ioutil.NopCloser(bytes.NewReader(payload.Bytes())),
+			Body: io.NopCloser(bytes.NewReader(payload.Bytes())),
 		}
 		webhook.ServeHTTP(respRecorder, req)
 		Expect(json.NewDecoder(respRecorder.Result().Body).Decode(convReview)).To(Succeed())

pkg/webhook/server.go

@@ -21,7 +21,6 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"os"
@@ -240,7 +239,7 @@ func (s *Server) Start(ctx context.Context) error {
 	// load CA to verify client certificate
 	if s.ClientCAName != "" {
 		certPool := x509.NewCertPool()
-		clientCABytes, err := ioutil.ReadFile(filepath.Join(s.CertDir, s.ClientCAName))
+		clientCABytes, err := os.ReadFile(filepath.Join(s.CertDir, s.ClientCAName))
 		if err != nil {
 			return fmt.Errorf("failed to read client CA cert: %v", err)
 		}

pkg/webhook/server_test.go

@@ -19,7 +19,7 @@ package webhook_test
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http"
 
@@ -136,7 +136,7 @@ var _ = Describe("Webhook Server", func() {
 				resp, err := client.Get(fmt.Sprintf("https://%s/somepath", testHostPort))
 				Expect(err).NotTo(HaveOccurred())
 				defer resp.Body.Close()
-				return ioutil.ReadAll(resp.Body)
+				return io.ReadAll(resp.Body)
 			}).Should(Equal([]byte("gadzooks!")))
 
 			Expect(server.StartedChecker()(nil)).To(Succeed())
@@ -176,7 +176,7 @@ var _ = Describe("Webhook Server", func() {
 			Expect(err).NotTo(HaveOccurred())
 			defer resp.Body.Close()
 
-			Expect(ioutil.ReadAll(resp.Body)).To(Equal([]byte("gadzooks!")))
+			Expect(io.ReadAll(resp.Body)).To(Equal([]byte("gadzooks!")))
 		})
 
 		It("should inject dependencies, if an inject func has been provided already", func() {
@@ -201,7 +201,7 @@ var _ = Describe("Webhook Server", func() {
 			resp, err := client.Get(fmt.Sprintf("https://%s/somepath", testHostPort))
 			Expect(err).NotTo(HaveOccurred())
 			defer resp.Body.Close()
-			return ioutil.ReadAll(resp.Body)
+			return io.ReadAll(resp.Body)
 		}).Should(Equal([]byte("gadzooks!")))
 
 		ctxCancel()