$ git clone -n https://src.fedoraproject.org/rpms/grafx2.git /var/lib/mock/f45-build-12965-444/root/chroot_tmpdir/scmroot/grafx2
Cloning into '/var/lib/mock/f45-build-12965-444/root/chroot_tmpdir/scmroot/grafx2'...
$ git fetch origin cae765cbf1b36990d6ef02e029d116c32d620aff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grafx2
 * [new ref]         cae765cbf1b36990d6ef02e029d116c32d620aff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cae765c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild