[PATCH 5/7] sha1_file: refuse to write tags referring to external objects

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 sha1_file.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sha1_file.c b/sha1_file.c
index ec3a040..01681e5 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2666,6 +2666,12 @@ static void check_sha1_file_for_external_source(const char *buf,
 					    sha1_to_hex(entry.sha1));
 				break;
 			}
+	} else if (!strcmp(type, "tag")) {
+		if (get_sha1_hex(buf + 7, sha1) < 0 ||
+		    sha1_object_info_extended(sha1, &oi) != OBJ_TREE ||
+		    (oi.alt && oi.alt->external))
+			die("cannot create a tag with external tree %s",
+			    sha1_to_hex(sha1));
 	}
 }
 
-- 
1.8.0.rc3.18.g0d9b108