[Cherry-pick v1.12] code clean for repository (#6768)

pkg/repository/backup_repo_op.go

@@ -107,9 +107,9 @@ func NewBackupRepository(namespace string, key BackupRepositoryKey) *velerov1api
 }
 
 func isBackupRepositoryNotFoundError(err error) bool {
-	return (err == errBackupRepoNotFound)
+	return err == errBackupRepoNotFound
 }
 
 func isBackupRepositoryNotProvisionedError(err error) bool {
-	return (err == errBackupRepoNotProvisioned)
+	return err == errBackupRepoNotProvisioned
 }

pkg/repository/config/aws.go

@@ -81,7 +81,7 @@ func GetS3Credentials(config map[string]string) (*credentials.Value, error) {
 	opts := session.Options{}
 	credentialsFile := config[CredentialsFileKey]
 	if credentialsFile == "" {
-		credentialsFile = os.Getenv("AWS_SHARED_CREDENTIALS_FILE")
+		credentialsFile = os.Getenv(awsCredentialsFileEnvVar)
 	}
 	if credentialsFile != "" {
 		opts.SharedConfigFiles = append(opts.SharedConfigFiles, credentialsFile)

pkg/repository/config/gcp.go

@@ -42,5 +42,5 @@
 	if credentialsFile, ok := config[CredentialsFileKey]; ok {
 		return credentialsFile
 	}
-	return os.Getenv("GOOGLE_APPLICATION_CREDENTIALS")
+	return os.Getenv(gcpCredentialsFileEnvVar)
 }