$ git clone -n http://fedora.riscv.rocks:3000/rpms/R-stringr.git /var/lib/mock/f41-build-840086-160507/root/chroot_tmpdir/scmroot/R-stringr
Cloning into '/var/lib/mock/f41-build-840086-160507/root/chroot_tmpdir/scmroot/R-stringr'...
$ git fetch origin f6b4cae4a1da1af4116033866b505ee33efce5b9:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/R-stringr
 * [new ref]         f6b4cae4a1da1af4116033866b505ee33efce5b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6b4cae Turn off bootstrap (riscv64)