$ git clone -n https://src.fedoraproject.org/rpms/dnf-plugin-diff.git /var/lib/mock/f40-build-2344380-59913/root/chroot_tmpdir/scmroot/dnf-plugin-diff
Cloning into '/var/lib/mock/f40-build-2344380-59913/root/chroot_tmpdir/scmroot/dnf-plugin-diff'...
$ git fetch origin fb626db91a6e3a17e86df308ce24190308b39aea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dnf-plugin-diff
 * [new ref]         fb626db91a6e3a17e86df308ce24190308b39aea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb626db Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild