$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mysql.git /var/lib/mock/f40-build-2068509-49293/root/chroot_tmpdir/scmroot/ocaml-mysql
Cloning into '/var/lib/mock/f40-build-2068509-49293/root/chroot_tmpdir/scmroot/ocaml-mysql'...
$ git fetch origin a4d131c69f0a593d3df9c8dccc57ba69178de117:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mysql
 * [new ref]         a4d131c69f0a593d3df9c8dccc57ba69178de117 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4d131c Bump release and rebuild