$ git clone -n https://gitee.com/little-huaduo/clang.git /var/lib/mock/dist-an23-build-503688-74854/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23-build-503688-74854/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin 2971d9d8104078d02fd1063debbfd331c78ec0c6:KOJI_FETCH_HEAD
From https://gitee.com/little-huaduo/clang
 * [new ref]         2971d9d8104078d02fd1063debbfd331c78ec0c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2971d9d Add Sw64 support for clang