$ git clone -n https://src.fedoraproject.org/rpms/R-globals.git /var/lib/mock/f45-build-6138-346/root/chroot_tmpdir/scmroot/R-globals
Cloning into '/var/lib/mock/f45-build-6138-346/root/chroot_tmpdir/scmroot/R-globals'...
$ git fetch origin 383cbdbc18b2183c2675efc4a49d0cc6f5468fe9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-globals
 * [new ref]         383cbdbc18b2183c2675efc4a49d0cc6f5468fe9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 383cbdb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild