$ git clone -n http://fedora.riscv.rocks:3000/rpms/clang.git /var/lib/mock/f41-build-810448-146688/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/f41-build-810448-146688/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin 6fb6bbd5572a8ad3ae6f228ffa2ef5794ac3e1c4:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/clang
 * [new ref]         6fb6bbd5572a8ad3ae6f228ffa2ef5794ac3e1c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fb6bbd Add support for riscv64