Re: [PATCH v5 4/9] ref: add more strict checks for regular refs

diff --git a/Documentation/fsck-msgids.txt b/Documentation/fsck-msgids.txt
index 22c385ea22..e310b5bce9 100644
--- a/Documentation/fsck-msgids.txt
+++ b/Documentation/fsck-msgids.txt

@@ -179,6 +179,14 @@
 `unknownType`::
 	(ERROR) Found an unknown object type.
 
+`unofficialFormattedRef`::
+	(INFO) The content of a loose ref file is not in the official
+	format such as not having a LF at the end or having trailing
+	garbage. As valid implementations of Git never created such a
+	loose ref file, it may become an error in the future. Report
+	to the git@vger.kernel.org mailing list if you see this error,
+	as we need to know what tools created such a file.
+

@@ -3541,6 +3546,21 @@ static int files_fsck_refs_content(struct ref_store *ref_store,
 		goto cleanup;
 	}
 
+	if (!(type & REF_ISSYMREF)) {
+		if (!*trailing) {
+			ret = fsck_report_ref(o, &report,
+					      FSCK_MSG_UNOFFICIAL_FORMATTED_REF,
+					      "misses LF at the end");
+			goto cleanup;
+		}
+		if (*trailing != '\n' || *(trailing + 1)) {
+			ret = fsck_report_ref(o, &report,
+					      FSCK_MSG_UNOFFICIAL_FORMATTED_REF,
+					      "has trailing garbage: '%s'", trailing);
+			goto cleanup;
+		}
+	}
+