$ git clone -n https://src.fedoraproject.org/rpms/emacs-undo-tree.git /var/lib/mock/f40-build-2209279-52153/root/chroot_tmpdir/scmroot/emacs-undo-tree
Cloning into '/var/lib/mock/f40-build-2209279-52153/root/chroot_tmpdir/scmroot/emacs-undo-tree'...
$ git fetch origin fd5cc9e864f24881d01bdfad602deb3f99c39074:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-undo-tree
 * [new ref]         fd5cc9e864f24881d01bdfad602deb3f99c39074 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd5cc9e Orphaned for 6+ weeks