$ git clone -n https://src.fedoraproject.org/rpms/mlt.git /var/lib/mock/f39-build-1790749-41742/root/chroot_tmpdir/scmroot/mlt
Cloning into '/var/lib/mock/f39-build-1790749-41742/root/chroot_tmpdir/scmroot/mlt'...
$ git fetch origin c54c952e787e80d7af8a58daf6b0a310ce056f1b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mlt
 * [new ref]         c54c952e787e80d7af8a58daf6b0a310ce056f1b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c54c952 Update to 7.20.0 (#2241895)