$ git clone -n http://fedora.riscv.rocks:3000/rpms/R-packrat.git /var/lib/mock/f41-build-840071-160507/root/chroot_tmpdir/scmroot/R-packrat
Cloning into '/var/lib/mock/f41-build-840071-160507/root/chroot_tmpdir/scmroot/R-packrat'...
$ git fetch origin e1b873b2d1aa8542c63f087a670c2d77692c7084:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/R-packrat
 * [new ref]         e1b873b2d1aa8542c63f087a670c2d77692c7084 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1b873b Turn off bootstrap (riscv64)