clone: validate --origin option before use

Providing a bad origin name to `git clone` currently reports an
'invalid refspec' error instead of a more explicit message explaining
that the `--origin` option was malformed.  This behavior dates back to
since 8434c2f1 (Build in clone, 2008-04-27).  Reintroduce
validation for the provided `--origin` option, but notably _don't_
include a multi-level check (e.g. "foo/bar") that was present in the
original ``.  `git remote` allows multi-level remote names
since at least 46220ca100 (remote.c: Fix overtight refspec validation,
2008-03-20), so that appears to be the desired behavior.

Helped-by: Junio C Hamano <>
Helped-by: Derrick Stolee <>
Helped-by: Jeff King <>
Signed-off-by: Sean Barag <>
Signed-off-by: Junio C Hamano <>
diff --git a/builtin/clone.c b/builtin/clone.c
index 258bfd6..78364a0 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -1012,6 +1012,9 @@
 	if (!option_origin)
 		option_origin = "origin";
+	if (!valid_remote_name(option_origin))
+		die(_("'%s' is not a valid remote name"), option_origin);
 	repo_name = argv[0];
 	path = get_repo_path(repo_name, &is_bundle);