$ git clone -n http://fedora.riscv.rocks:3000/rpms/R-sourcetools.git /var/lib/mock/f41-build-838547-159749/root/chroot_tmpdir/scmroot/R-sourcetools
Cloning into '/var/lib/mock/f41-build-838547-159749/root/chroot_tmpdir/scmroot/R-sourcetools'...
$ git fetch origin 16fe2453a2a6b6814532038e1fed351d65407dfd:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/R-sourcetools
 * [new ref]         16fe2453a2a6b6814532038e1fed351d65407dfd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16fe245 disable tests to bootstrap testthat