040000 tree 38f6d9c17a24d32604972eef87f94b0a1e2ba861	core
040000 tree 0b2e61165335a959f2791488ddfb4651fa4da4fa	event
040000 tree 67e0a2ae65d0d009c741ac33adcef5bcfc42064a	http
040000 tree 3b82f27b60f18082a3cd190b479d903702a1678b	os