$ git clone -n http://fedora.riscv.rocks:3000/rpms/R-httpuv.git /var/lib/mock/f40-build-761226-121451/root/chroot_tmpdir/scmroot/R-httpuv
Cloning into '/var/lib/mock/f40-build-761226-121451/root/chroot_tmpdir/scmroot/R-httpuv'...
$ git fetch origin 6831b37db03c08bbae4bef062f08bfd0df9ab12c:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/R-httpuv
 * [new ref]         6831b37db03c08bbae4bef062f08bfd0df9ab12c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6831b37 Bootstrap (riscv64)