$ git clone -n https://src.fedoraproject.org/rpms/fltk1.3.git /var/lib/mock/f45-build-9095-398/root/chroot_tmpdir/scmroot/fltk1.3
Cloning into '/var/lib/mock/f45-build-9095-398/root/chroot_tmpdir/scmroot/fltk1.3'...
$ git fetch origin 43e5ba2e0581c2f06680fc9f72f61e43ccb6a278:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fltk1.3
 * [new ref]         43e5ba2e0581c2f06680fc9f72f61e43ccb6a278 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 43e5ba2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild