$ git clone -n http://fedora.riscv.rocks:3000/rpms/fedora-repos.git /var/lib/mock/f42-p550-49-19/root/chroot_tmpdir/scmroot/fedora-repos
Cloning into '/var/lib/mock/f42-p550-49-19/root/chroot_tmpdir/scmroot/fedora-repos'...
$ git fetch origin b65df22ac9d0e296d05301f46fde0698502408b5:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/fedora-repos
 * [new ref]         b65df22ac9d0e296d05301f46fde0698502408b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b65df22 Switch to new Fedora RISC-V Koji instance