TUN-7590: Remove usages of ioutil

cmd/cloudflared/service_template.go

@@ -5,7 +5,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path"
@@ -64,7 +63,7 @@ func (st *ServiceTemplate) Generate(args *ServiceTemplateArgs) error {
 		return fmt.Errorf("error creating %s: %v", plistFolder, err)
 	}
 
-	err = ioutil.WriteFile(resolvedPath, buffer.Bytes(), fileMode)
+	err = os.WriteFile(resolvedPath, buffer.Bytes(), fileMode)
 	if err != nil {
 		return fmt.Errorf("error writing %s: %v", resolvedPath, err)
 	}
@@ -103,7 +102,7 @@ func runCommand(command string, args ...string) error {
 		return fmt.Errorf("error starting %s: %v", command, err)
 	}
 
-	output, _ := ioutil.ReadAll(stderr)
+	output, _ := io.ReadAll(stderr)
 	err = cmd.Wait()
 	if err != nil {
 		return fmt.Errorf("%s %v returned with error code %v due to: %v", command, args, err, string(output))

cmd/cloudflared/tunnel/cmd.go

@@ -4,7 +4,6 @@ import (
 	"bufio"
 	"context"
 	"fmt"
-	"io/ioutil"
 	"net/url"
 	"os"
 	"runtime/trace"
@@ -305,7 +304,7 @@ func StartServer(
 	}
 
 	if c.IsSet("trace-output") {
-		tmpTraceFile, err := ioutil.TempFile("", "trace")
+		tmpTraceFile, err := os.CreateTemp("", "trace")
 		if err != nil {
 			log.Err(err).Msg("Failed to create new temporary file to save trace output")
 		}

cmd/cloudflared/tunnel/filesystem.go

@@ -1,7 +1,6 @@
 package tunnel
 
 import (
-	"io/ioutil"
 	"os"
 )
 
@@ -23,5 +22,5 @@ func (fs realFileSystem) validFilePath(path string) bool {
 }
 
 func (fs realFileSystem) readFile(filePath string) ([]byte, error) {
-	return ioutil.ReadFile(filePath)
+	return os.ReadFile(filePath)
 }

cmd/cloudflared/tunnel/login.go

@@ -2,7 +2,6 @@ package tunnel
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net/url"
 	"os"
 	"path/filepath"
@@ -66,7 +65,7 @@ func login(c *cli.Context) error {
 		return err
 	}
 
-	if err := ioutil.WriteFile(path, resourceData, 0600); err != nil {
+	if err := os.WriteFile(path, resourceData, 0600); err != nil {
 		return errors.Wrap(err, fmt.Sprintf("error writing cert to %s", path))
 	}
 

cmd/cloudflared/tunnel/subcommands.go

@@ -5,7 +5,6 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -241,7 +240,7 @@ func writeTunnelCredentials(filePath string, credentials *connection.Credentials
 	if err != nil {
 		return errors.Wrap(err, "Unable to marshal tunnel credentials to JSON")
 	}
-	return ioutil.WriteFile(filePath, body, 400)
+	return os.WriteFile(filePath, body, 0400)
 }
 
 func buildListCommand() *cli.Command {

cmd/cloudflared/updater/workers_service_test.go

@@ -11,7 +11,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"net/http/httptest"
@@ -224,7 +223,7 @@ func TestUpdateService(t *testing.T) {
 	require.Equal(t, v.Version(), mostRecentVersion)
 
 	require.NoError(t, v.Apply())
-	dat, err := ioutil.ReadFile(testFilePath)
+	dat, err := os.ReadFile(testFilePath)
 	require.NoError(t, err)
 
 	require.Equal(t, string(dat), mostRecentVersion)
@@ -243,7 +242,7 @@ func TestBetaUpdateService(t *testing.T) {
 	require.Equal(t, v.Version(), mostRecentBetaVersion)
 
 	require.NoError(t, v.Apply())
-	dat, err := ioutil.ReadFile(testFilePath)
+	dat, err := os.ReadFile(testFilePath)
 	require.NoError(t, err)
 
 	require.Equal(t, string(dat), mostRecentBetaVersion)
@@ -289,7 +288,7 @@ func TestForcedUpdateService(t *testing.T) {
 	require.Equal(t, v.Version(), mostRecentVersion)
 
 	require.NoError(t, v.Apply())
-	dat, err := ioutil.ReadFile(testFilePath)
+	dat, err := os.ReadFile(testFilePath)
 	require.NoError(t, err)
 
 	require.Equal(t, string(dat), mostRecentVersion)
@@ -309,7 +308,7 @@ func TestUpdateSpecificVersionService(t *testing.T) {
 	require.Equal(t, reqVersion, v.Version())
 
 	require.NoError(t, v.Apply())
-	dat, err := ioutil.ReadFile(testFilePath)
+	dat, err := os.ReadFile(testFilePath)
 	require.NoError(t, err)
 
 	require.Equal(t, reqVersion, string(dat))
@@ -328,7 +327,7 @@ func TestCompressedUpdateService(t *testing.T) {
 	require.Equal(t, "2020.09.02", v.Version())
 
 	require.NoError(t, v.Apply())
-	dat, err := ioutil.ReadFile(testFilePath)
+	dat, err := os.ReadFile(testFilePath)
 	require.NoError(t, err)
 
 	require.Equal(t, "2020.09.02", string(dat))