0000000000000000000000000000000000000000 0754d21c865e97582968fa5d155eac133e5829b0 tansq <tansq@szuc.cn> 1520330398 +0800	clone: from git://github.com/mit-pdos/xv6-public.git
0754d21c865e97582968fa5d155eac133e5829b0 2ae8392a5c203a7b1bc5b8bff5eabc8b5eab8972 tansq <tansq@szuc.cn> 1520330424 +0800	checkout: moving from master to xv6-rev7
