$ git clone -n https://src.fedoraproject.org/rpms/gtkimageview.git /var/lib/mock/f45-build-13194-447/root/chroot_tmpdir/scmroot/gtkimageview
Cloning into '/var/lib/mock/f45-build-13194-447/root/chroot_tmpdir/scmroot/gtkimageview'...
$ git fetch origin 9769ddcbb5a9c0bd978afe566f37fbc97d3cc668:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtkimageview
 * [new ref]         9769ddcbb5a9c0bd978afe566f37fbc97d3cc668 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9769ddc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild