$ git clone -n https://github.com/fedora-riscv/clang.git /var/lib/mock/f38-build-side-42-init-devel-682137-26742/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-682137-26742/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin 2f8aae6ee52751c8c3b39cdd33cd2e7793e318f3:KOJI_FETCH_HEAD
From https://github.com/fedora-riscv/clang
 * [new ref]         2f8aae6ee52751c8c3b39cdd33cd2e7793e318f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f8aae6 Bring back riscv64-redhat-linux triplet