$ git clone -n https://src.fedoraproject.org/rpms/transactional-update.git /var/lib/mock/f39-build-1558207-37303/root/chroot_tmpdir/scmroot/transactional-update
Cloning into '/var/lib/mock/f39-build-1558207-37303/root/chroot_tmpdir/scmroot/transactional-update'...
$ git fetch origin df3c0cc7710f8b0703ff74097a1597e698ada345:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/transactional-update
 * [new ref]         df3c0cc7710f8b0703ff74097a1597e698ada345 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df3c0cc Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild