$ git clone -n https://gitee.com/little-huaduo/clang.git /var/lib/mock/dist-an23-build-458532-73691/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/dist-an23-build-458532-73691/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin dff4051940d3a01ce942a5bedc1ac57a31fd3f4f:KOJI_FETCH_HEAD
From https://gitee.com/little-huaduo/clang
 * [new ref]         dff4051940d3a01ce942a5bedc1ac57a31fd3f4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dff4051 Add Sw64 support for clang