$ git clone -n https://src.fedoraproject.org/rpms/gxemul.git /var/lib/mock/f45-build-13293-448/root/chroot_tmpdir/scmroot/gxemul
Cloning into '/var/lib/mock/f45-build-13293-448/root/chroot_tmpdir/scmroot/gxemul'...
$ git fetch origin 5b85587349d6b9eb1404f01254d0e64c3b121c3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gxemul
 * [new ref]         5b85587349d6b9eb1404f01254d0e64c3b121c3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b85587 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild