$ git clone -n https://src.fedoraproject.org/rpms/libgnomecanvasmm26.git /var/lib/mock/f45-build-16307-484/root/chroot_tmpdir/scmroot/libgnomecanvasmm26
Cloning into '/var/lib/mock/f45-build-16307-484/root/chroot_tmpdir/scmroot/libgnomecanvasmm26'...
$ git fetch origin 132b880e5ca8bbd4ddd2b4f0347d2ebbec9dc137:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgnomecanvasmm26
 * [new ref]         132b880e5ca8bbd4ddd2b4f0347d2ebbec9dc137 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 132b880 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild