$ git clone -n https://src.fedoraproject.org/rpms/gf2x.git /var/lib/mock/f45-build-9829-409/root/chroot_tmpdir/scmroot/gf2x
Cloning into '/var/lib/mock/f45-build-9829-409/root/chroot_tmpdir/scmroot/gf2x'...
$ git fetch origin 94436a255bfe8fbf18e39802334e3b1f80a8f538:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gf2x
 * [new ref]         94436a255bfe8fbf18e39802334e3b1f80a8f538 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94436a2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild