Merge branch 'jk/noetcconfig'

* jk/noetcconfig:
  fix config reading in tests
  allow suppressing of global and system config

Conflicts:

	cache.h

builtin-config.c

@@ -79,9 +79,10 @@ static int get_value(const char* key_, const char* regex_)
 		local = getenv(CONFIG_LOCAL_ENVIRONMENT);
 		if (!local)
 			local = repo_config = xstrdup(git_path("config"));
-		if (home)
+		if (git_config_global() && home)
 			global = xstrdup(mkpath("%s/.gitconfig", home));
-		system_wide = git_etc_gitconfig();
+		if (git_config_system())
+			system_wide = git_etc_gitconfig();
 	}
 
 	key = xstrdup(key_);