$ git clone -n https://src.fedoraproject.org/rpms/R-RInside.git /var/lib/mock/f45-build-5928-345/root/chroot_tmpdir/scmroot/R-RInside
Cloning into '/var/lib/mock/f45-build-5928-345/root/chroot_tmpdir/scmroot/R-RInside'...
$ git fetch origin 67914169d6f3f52e9aa80ef7cffa5a52cd657d80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RInside
 * [new ref]         67914169d6f3f52e9aa80ef7cffa5a52cd657d80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6791416 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild