$ git clone -n https://src.fedoraproject.org/rpms/R-S7.git /var/lib/mock/f45-build-5966-345/root/chroot_tmpdir/scmroot/R-S7
Cloning into '/var/lib/mock/f45-build-5966-345/root/chroot_tmpdir/scmroot/R-S7'...
$ git fetch origin bba6e9180070796964d0e41d25be9b766b197805:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-S7
 * [new ref]         bba6e9180070796964d0e41d25be9b766b197805 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bba6e91 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild