Add filename to error message

migrate.go

@@ -67,19 +67,22 @@ func Migrate(db *sql.DB, version int, o Options, asset AssetFunc) error {
 	}
 
 	for i := v + 1; i <= version; i++ {
-		script, err := asset(fmt.Sprintf(o.AssetPrefix+fileFormat, i))
+		fileName := fmt.Sprintf(o.AssetPrefix+fileFormat, i)
+		errorf := func(e error) error { return fmt.Errorf(`migration "%s" failed: %w`, fileName, e) }
+
+		script, err := asset(fileName)
 		if err != nil {
-			return ErrUpdatesMissing
+			return errorf(ErrUpdatesMissing)
 		}
 
 		_, err = tx.Exec(string(script))
 		if err != nil {
-			return err
+			return errorf(err)
 		}
 
 		_, err = tx.Exec(`INSERT INTO ` + o.TableName + ` VALUES (` + strconv.Itoa(i) + `)`)
 		if err != nil {
-			return err
+			return errorf(err)
 		}
 	}