`joe@joe-Aspire-Z3730:~/android/aosp$ repo init -u https://aosp.tuna.tsinghua.edu.cn/platform/manifest -b android-5.1.1_r4 .repo/manifests/: discarding 407 commits`joe@joe-Aspire-Z3730:~/android/aosp$ repo init -u
`joe@joe-Aspire-Z3730:~/android/aosp$ repo init -u https://aosp.tuna.tsinghua.edu.cn/platform/manifest -b android-5.1.1_r4 .repo/manifests/: discarding 407 commits`joe@joe-Aspire-Z3730:~/android/aosp$ repo init -u