lib-lua: Use rawget to check presence of functions in scripts

With the restricted global variables in next commit, checking for
undeclared functions results in error. Use rawget to avoid metamethods.

diff --git a/src/lib-lua/dlua-script.c b/src/lib-lua/dlua-script.c
index 31fa69793a272cecdd5dcc82c4918dae6b0373e4..48fe286bb674e0e230a52a1d270cdf494fc86ec6 100644 (file)
--- a/src/lib-lua/dlua-script.c
+++ b/src/lib-lua/dlua-script.c
@@ -381,9 +381,11 @@ void dlua_script_unref(struct dlua_script **_script)
 bool dlua_script_has_function(struct dlua_script *script, const char *fn)
 {
        i_assert(script != NULL);
-       lua_getglobal(script->L, fn);
+       lua_getglobal(script->L, "_G");
+       lua_pushstring(script->L, fn);
+       lua_rawget(script->L, -2);
        bool ret = lua_isfunction(script->L, -1);
-       lua_pop(script->L, 1);
+       lua_pop(script->L, 2);
        return ret;
 }