$ git clone -n https://src.fedoraproject.org/rpms/duff.git /var/lib/mock/f40-build-801345-143761/root/chroot_tmpdir/scmroot/duff
Cloning into '/var/lib/mock/f40-build-801345-143761/root/chroot_tmpdir/scmroot/duff'...
$ git fetch origin 39a5eaaa548b7dced8a0a2d3f49a8e5fe9fea0f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/duff
 * [new ref]         39a5eaaa548b7dced8a0a2d3f49a8e5fe9fea0f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39a5eaa Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild