improve scanner logging

scanner/scanner.go

@@ -256,7 +256,7 @@ func (s *Scanner) handleTrack(it *item) error {
 	track.AlbumID = s.curFolderID()
 	tags, err := readTags(it.fullPath)
 	if err != nil {
-		return errors.Wrap(err, "reading tags")
+		return errors.Wrapf(err, "reading tags for file `%s`", it.relPath)
 	}
 	track.TagTitle = tags.Title()
 	track.TagTrackArtist = tags.Artist()

scanner/tags.go

@@ -39,12 +39,12 @@ func (t *tags) DurationSecs() int {
 func readTags(path string) (*tags, error) {
 	track, err := os.Open(path)
 	if err != nil {
-		return nil, errors.Wrap(err, "reading track from disk")
+		return nil, errors.Wrap(err, "reading disk")
 	}
 	defer track.Close()
 	parser, err := taggolib.New(track)
 	if err != nil {
-		return nil, errors.Wrap(err, "reading tags from track")
+		return nil, errors.Wrap(err, "parsing")
 	}
 	newTags := &tags{parser}
 	return newTags, nil