$ git clone -n https://src.fedoraproject.org/rpms/rstudio.git /var/lib/mock/f41-build-717252-13077/root/chroot_tmpdir/scmroot/rstudio
Cloning into '/var/lib/mock/f41-build-717252-13077/root/chroot_tmpdir/scmroot/rstudio'...
$ git fetch origin 3c0ed7905b8fc1d0856b5168e0a422295da3d9c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rstudio
 * [new ref]         3c0ed7905b8fc1d0856b5168e0a422295da3d9c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c0ed79 Fix Lato fonts link