$ git clone -n https://src.fedoraproject.org/rpms/ocaml-base.git /var/lib/mock/f39-build-2064763-49223/root/chroot_tmpdir/scmroot/ocaml-base
Cloning into '/var/lib/mock/f39-build-2064763-49223/root/chroot_tmpdir/scmroot/ocaml-base'...
$ git fetch origin ebb48198d24b41edafd03a53e7dda1d80df2892f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-base
 * [new ref]         ebb48198d24b41edafd03a53e7dda1d80df2892f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebb4819 Version 0.16.3