Revert "loader/lua: Remove compat shim for loader.lua_path"

This reverts commit ab97d42addae97a389c6f22d6bba62ed954bb8e7.

There's too many people in the field with FreeBSD 12.0 loader.efi that
stubbed their toe on upgrading to 14.1 since they'd not updated
loader.efi. While we sort out that mess, add back this workaround.  Can
revisit after 14.2 maybe.

MFC After: 		3 days
Sponsored by:		Netflix
Reviewed by:		kevans
Differential Revision:	https://reviews.freebsd.org/D45882

1 files changed, 7 insertions, 1 deletions

diff --git a/stand/lua/core.lua b/stand/lua/core.lua
index eaabff6a7602..9226de564348 100644
--- a/stand/lua/core.lua
+++ b/stand/lua/core.lua
@@ -65,7 +65,13 @@ end
 -- message on failure.
 function try_include(module)
 	if module:sub(1, 1) ~= "/" then
-		module = loader.lua_path .. "/" .. module
+		local lua_path = loader.lua_path
+		-- XXX Temporary compat shim; this should be removed once the
+		-- loader.lua_path export has sufficiently spread.
+		if lua_path == nil then
+			lua_path = "/boot/lua"
+		end
+		module = lua_path .. "/" .. module
 		-- We only attempt to append an extension if an absolute path
 		-- wasn't specified.  This assumes that the caller either wants
 		-- to treat this like it would require() and specify just the