$ git clone -n https://src.fedoraproject.org/rpms/gnome-kra-ora-thumbnailer.git /var/lib/mock/f45-build-11441-430/root/chroot_tmpdir/scmroot/gnome-kra-ora-thumbnailer
Cloning into '/var/lib/mock/f45-build-11441-430/root/chroot_tmpdir/scmroot/gnome-kra-ora-thumbnailer'...
$ git fetch origin 016b44d9040b58c2023940ff8aad7a43ff5c09f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-kra-ora-thumbnailer
 * [new ref]         016b44d9040b58c2023940ff8aad7a43ff5c09f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 016b44d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild