$ git clone -n https://src.fedoraproject.org/rpms/R-here.git /var/lib/mock/f45-build-6159-346/root/chroot_tmpdir/scmroot/R-here
Cloning into '/var/lib/mock/f45-build-6159-346/root/chroot_tmpdir/scmroot/R-here'...
$ git fetch origin d9f34331e757983da6ac4abe965c9ab02a44137e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-here
 * [new ref]         d9f34331e757983da6ac4abe965c9ab02a44137e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d9f3433 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild