$ git clone -n http://fedora.riscv.rocks:3000/rpms/R-mockr.git /var/lib/mock/f41-build-840069-160507/root/chroot_tmpdir/scmroot/R-mockr
Cloning into '/var/lib/mock/f41-build-840069-160507/root/chroot_tmpdir/scmroot/R-mockr'...
$ git fetch origin 87b38c9c4154bbed581cb01948d20dacd0e7b10d:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/R-mockr
 * [new ref]         87b38c9c4154bbed581cb01948d20dacd0e7b10d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87b38c9 Turn off bootstrap (riscv64)