filecontent mapper: Handle error from directory

If we couldn't read because the source is a directory, override the original error message.
alecthomas · Dec 10, 2023 · 404418a · 404418a
1 parent ca7d762
commit 404418a
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/mapper.go b/mapper.go
@@ -717,6 +717,9 @@ func fileContentMapper(r *Registry) MapperFunc {
 			data, err = ioutil.ReadAll(os.Stdin)
 		}
 		if err != nil {
+			if info, statErr := os.Stat(path); statErr == nil && info.IsDir() {
+				return fmt.Errorf("%q exists but is a directory: %w", path, err)
+			}
 			return err
 		}
 		target.SetBytes(data)