$ git clone -n https://src.fedoraproject.org/rpms/R-sfsmisc.git /var/lib/mock/f45-build-6431-348/root/chroot_tmpdir/scmroot/R-sfsmisc
Cloning into '/var/lib/mock/f45-build-6431-348/root/chroot_tmpdir/scmroot/R-sfsmisc'...
$ git fetch origin 76695ed3ea2598bd0d7694a3f4429e2bf793b319:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sfsmisc
 * [new ref]         76695ed3ea2598bd0d7694a3f4429e2bf793b319 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 76695ed Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild