$ git clone -n http://fedora.riscv.rocks:3000/rpms/R-systemfonts.git /var/lib/mock/f41-build-838740-159825/root/chroot_tmpdir/scmroot/R-systemfonts
Cloning into '/var/lib/mock/f41-build-838740-159825/root/chroot_tmpdir/scmroot/R-systemfonts'...
$ git fetch origin db5ab52c3c5910ac46be74793ecef88bea528d26:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/R-systemfonts
 * [new ref]         db5ab52c3c5910ac46be74793ecef88bea528d26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db5ab52 disables tests to bootstrap testthat