$ git clone -n https://src.fedoraproject.org/rpms/ocaml-fmt.git /var/lib/mock/f42-build-3402230-45132/root/chroot_tmpdir/scmroot/ocaml-fmt
Cloning into '/var/lib/mock/f42-build-3402230-45132/root/chroot_tmpdir/scmroot/ocaml-fmt'...
$ git fetch origin 5772f6d15ede46b39ec94a1d0edb1c894612ada4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-fmt
 * [new ref]         5772f6d15ede46b39ec94a1d0edb1c894612ada4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5772f6d Version 0.10.0