$ git clone -n https://src.fedoraproject.org/rpms/flowcanvas.git /var/lib/mock/f40-build-1996577-44033/root/chroot_tmpdir/scmroot/flowcanvas
Cloning into '/var/lib/mock/f40-build-1996577-44033/root/chroot_tmpdir/scmroot/flowcanvas'...
$ git fetch origin 6c8136b1b6775883648cdd546be5a210dd88a57b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flowcanvas
 * [new ref]         6c8136b1b6775883648cdd546be5a210dd88a57b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c8136b Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild