$ git clone -n https://src.fedoraproject.org/rpms/libXxf86dga.git /var/lib/mock/f45-build-15801-479/root/chroot_tmpdir/scmroot/libXxf86dga
Cloning into '/var/lib/mock/f45-build-15801-479/root/chroot_tmpdir/scmroot/libXxf86dga'...
$ git fetch origin 557066d3085479ab1c00db29932f6f76dc87b15d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXxf86dga
 * [new ref]         557066d3085479ab1c00db29932f6f76dc87b15d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 557066d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild