$ git clone -n https://src.fedoraproject.org/rpms/emacs-undo-tree.git /var/lib/mock/f39-build-1577366-37960/root/chroot_tmpdir/scmroot/emacs-undo-tree
Cloning into '/var/lib/mock/f39-build-1577366-37960/root/chroot_tmpdir/scmroot/emacs-undo-tree'...
$ git fetch origin d4669fc5220babdc323e6baf42a8022b42cb80c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-undo-tree
 * [new ref]         d4669fc5220babdc323e6baf42a8022b42cb80c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4669fc Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild