$ git clone -n http://fedora.riscv.rocks:3000/rpms/clang.git /var/lib/mock/f40-build-799331-142294/root/chroot_tmpdir/scmroot/clang
Cloning into '/var/lib/mock/f40-build-799331-142294/root/chroot_tmpdir/scmroot/clang'...
$ git fetch origin f5729515c2a0b4f47d5509197fa0e706b7c6f3b6:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/clang
 * [new ref]         f5729515c2a0b4f47d5509197fa0e706b7c6f3b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f572951 Add support for riscv64