[WIP] Fix minor bugs

service/updates/bundle.go

@@ -120,9 +120,12 @@ func checkIfFileIsValid(filename string, artifact Artifact) (bool, error) {
 	defer func() { _ = file.Close() }()
 
 	providedHash, err := hex.DecodeString(artifact.SHA256)
-	if err != nil || len(providedHash) != sha256.Size {
+	if err != nil {
 		return false, fmt.Errorf("invalid provided hash %s: %w", artifact.SHA256, err)
 	}
+	if len(providedHash) != sha256.Size {
+		return false, fmt.Errorf("invalid hash length for %s", artifact.SHA256)
+	}
 
 	// Calculate hash of the file
 	fileHash := sha256.New()

service/updates/downloader.go

@@ -181,7 +181,7 @@ func (d *Downloader) downloadAndVerify(ctx context.Context) error {
 	// Make sure we have the bundle file parsed.
 	err := d.parseBundle()
 	if err != nil {
-		log.Errorf("updates: invalid update bundle file: %s", err)
+		return fmt.Errorf("invalid update bundle file: %w", err)
 	}
 
 	// Make sure dir exists