Handle ioutil deprecations (#53526)

* replace ioutil.ReadFile -> os.ReadFile

* replace ioutil.ReadAll -> io.ReadAll

* replace ioutil.TempFile -> os.CreateTemp

* replace ioutil.NopCloser -> io.NopCloser

* replace ioutil.WriteFile -> os.WriteFile

* replace ioutil.TempDir -> os.MkdirTemp

* replace ioutil.Discard -> io.Discard

pkg/cmd/grafana-cli/services/api_client.go

@@ -7,7 +7,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
@@ -142,7 +141,7 @@ func sendRequestGetBytes(client http.Client, repoUrl string, subPaths ...string)
 			logger.Warn("Failed to close stream", "err", err)
 		}
 	}()
-	return ioutil.ReadAll(bodyReader)
+	return io.ReadAll(bodyReader)
 }
 
 func sendRequest(client http.Client, repoUrl string, subPaths ...string) (io.ReadCloser, error) {
@@ -191,7 +190,7 @@ func handleResponse(res *http.Response) (io.ReadCloser, error) {
 	}
 
 	if res.StatusCode/100 == 4 {
-		body, err := ioutil.ReadAll(res.Body)
+		body, err := io.ReadAll(res.Body)
 		defer func() {
 			if err := res.Body.Close(); err != nil {
 				logger.Warn("Failed to close response body", "err", err)

pkg/cmd/grafana-cli/services/api_client_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"errors"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"testing"
 
@@ -19,7 +18,7 @@ func TestHandleResponse(t *testing.T) {
 		resp := makeResponse(t, 200, "test")
 		bodyReader, err := handleResponse(resp)
 		require.NoError(t, err)
-		body, err := ioutil.ReadAll(bodyReader)
+		body, err := io.ReadAll(bodyReader)
 		require.NoError(t, err)
 		assert.Equal(t, "test", string(body))
 	})
@@ -81,7 +80,7 @@ func makeResponse(t *testing.T, status int, body string) *http.Response {
 func makeBody(t *testing.T, body string) io.ReadCloser {
 	t.Helper()
 
-	reader := ioutil.NopCloser(bytes.NewReader([]byte(body)))
+	reader := io.NopCloser(bytes.NewReader([]byte(body)))
 	t.Cleanup(func() {
 		err := reader.Close()
 		assert.NoError(t, err)

pkg/cmd/grafana-cli/services/io_util.go

@@ -25,5 +25,5 @@ func (i IoUtilImp) ReadFile(filename string) ([]byte, error) {
 	// from command line flag "pluginsDir". If the user shouldn't be reading from this directory, they shouldn't have
 	// the permission in the file system.
 	// nolint:gosec
-	return ioutil.ReadFile(filename)
+	return os.ReadFile(filename)
 }