notes: disallow reusing non-blob as a note object
Currently "git notes add -C $object" will read the raw bytes from $object,
and then copy those bytes into the note object, which is hardcoded to be
of type blob. This means that if the given $object is a non-blob (e.g.
tree or commit), the raw bytes from that object is copied into a blob
object. This is probably not useful, and certainly not what any sane
user would expect. So disallow it, by erroring out if the $object passed
to the -C option is not a blob.
The fix also applies to the -c option (in which the user is prompted to
edit/verify the note contents in a text editor), and also when -c/-C is
passed to "git notes append" (which appends the $object contents to an
existing note object). In both cases, passing a non-blob $object does not
make sense.
Also add a couple of tests demonstrating expected behavior.
Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/notes.c b/builtin/notes.c
index e4100c4..c11d6e6 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -269,7 +269,11 @@
die(_("Failed to resolve '%s' as a valid ref."), arg);
if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
free(buf);
- die(_("Failed to read object '%s'."), arg);;
+ die(_("Failed to read object '%s'."), arg);
+ }
+ if (type != OBJ_BLOB) {
+ free(buf);
+ die(_("Cannot read note data from non-blob object '%s'."), arg);
}
strbuf_add(&(msg->buf), buf, len);
free(buf);
