$ git clone -n http://fedora.riscv.rocks:3000/rpms/R-withr.git /var/lib/mock/f41-build-840091-160507/root/chroot_tmpdir/scmroot/R-withr
Cloning into '/var/lib/mock/f41-build-840091-160507/root/chroot_tmpdir/scmroot/R-withr'...
$ git fetch origin 0b124a73600776a5a0f5a6a8ed316e1e58fd5a58:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/R-withr
 * [new ref]         0b124a73600776a5a0f5a6a8ed316e1e58fd5a58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b124a7 Turn off bootstrap (riscv64)