chore: fix linter rules

cmd/cloudflared/service_template.go

@@ -1,8 +1,8 @@
 package main
 
 import (
-	"bufio"
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -44,7 +44,7 @@ func (st *ServiceTemplate) Generate(args *ServiceTemplateArgs) error {
 		return err
 	}
 	if _, err = os.Stat(resolvedPath); err == nil {
-		return fmt.Errorf(serviceAlreadyExistsWarn(resolvedPath))
+		return errors.New(serviceAlreadyExistsWarn(resolvedPath))
 	}
 
 	var buffer bytes.Buffer
@@ -118,49 +118,6 @@ func ensureConfigDirExists(configDir string) error {
 	return err
 }
 
-// openFile opens the file at path. If create is set and the file exists, returns nil, true, nil
-func openFile(path string, create bool) (file *os.File, exists bool, err error) {
-	expandedPath, err := homedir.Expand(path)
-	if err != nil {
-		return nil, false, err
-	}
-	if create {
-		fileInfo, err := os.Stat(expandedPath)
-		if err == nil && fileInfo.Size() > 0 {
-			return nil, true, nil
-		}
-		file, err = os.OpenFile(expandedPath, os.O_RDWR|os.O_CREATE, 0600)
-	} else {
-		file, err = os.Open(expandedPath)
-	}
-	return file, false, err
-}
-
-func copyCredential(srcCredentialPath, destCredentialPath string) error {
-	destFile, exists, err := openFile(destCredentialPath, true)
-	if err != nil {
-		return err
-	} else if exists {
-		// credentials already exist, do nothing
-		return nil
-	}
-	defer destFile.Close()
-
-	srcFile, _, err := openFile(srcCredentialPath, false)
-	if err != nil {
-		return err
-	}
-	defer srcFile.Close()
-
-	// Copy certificate
-	_, err = io.Copy(destFile, srcFile)
-	if err != nil {
-		return fmt.Errorf("unable to copy %s to %s: %v", srcCredentialPath, destCredentialPath, err)
-	}
-
-	return nil
-}
-
 func copyFile(src, dest string) error {
 	srcFile, err := os.Open(src)
 	if err != nil {
@@ -187,36 +144,3 @@ func copyFile(src, dest string) error {
 	ok = true
 	return nil
 }
-
-func copyConfig(srcConfigPath, destConfigPath string) error {
-	// Copy or create config
-	destFile, exists, err := openFile(destConfigPath, true)
-	if err != nil {
-		return fmt.Errorf("cannot open %s with error: %s", destConfigPath, err)
-	} else if exists {
-		// config already exists, do nothing
-		return nil
-	}
-	defer destFile.Close()
-
-	srcFile, _, err := openFile(srcConfigPath, false)
-	if err != nil {
-		fmt.Println("Your service needs a config file that at least specifies the hostname option.")
-		fmt.Println("Type in a hostname now, or leave it blank and create the config file later.")
-		fmt.Print("Hostname: ")
-		reader := bufio.NewReader(os.Stdin)
-		input, _ := reader.ReadString('\n')
-		if input == "" {
-			return err
-		}
-		fmt.Fprintf(destFile, "hostname: %s\n", input)
-	} else {
-		defer srcFile.Close()
-		_, err = io.Copy(destFile, srcFile)
-		if err != nil {
-			return fmt.Errorf("unable to copy %s to %s: %v", srcConfigPath, destConfigPath, err)
-		}
-	}
-
-	return nil
-}