We only allow cuts at commits, not arbitrary objects. upload-pack will
fail eventually in register_shallow if a non-commit is given with a
generic error "Object %s is a %s, not a commit". Check it early and
give a more accurate error.

This should never show up in an ordinary session. It's for buggy
clients, or when the user manually edits .git/shallow.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
 upload-pack.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/upload-pack.c b/upload-pack.c
index 6142421..95d8313 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -603,6 +603,8 @@ static void receive_needs(void)
                        object = parse_object(sha1);
                        if (!object)
                                die("did not find object for %s", line);
+                       if (object->type != OBJ_COMMIT)
+                               die("invalid shallow object %s", 
                        object->flags |= CLIENT_SHALLOW;
                        add_object_array(object, NULL, &shallows);

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