$ git clone -n https://src.fedoraproject.org/rpms/ocaml-tyxml.git /var/lib/mock/f39-build-1933237-43116/root/chroot_tmpdir/scmroot/ocaml-tyxml
Cloning into '/var/lib/mock/f39-build-1933237-43116/root/chroot_tmpdir/scmroot/ocaml-tyxml'...
$ git fetch origin 2cace5e9f82ee57d80bf0c799b1ee1cdc8d6cbd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-tyxml
 * [new ref]         2cace5e9f82ee57d80bf0c799b1ee1cdc8d6cbd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cace5e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild