$ git clone -n https://src.fedoraproject.org/rpms/ocaml-bos.git /var/lib/mock/f38-build-side-42-init-devel-669497-26660/root/chroot_tmpdir/scmroot/ocaml-bos
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-669497-26660/root/chroot_tmpdir/scmroot/ocaml-bos'...
$ git fetch origin 214ac8686952d260b0da86c75bc99a0d8f72c55b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-bos
 * [new ref]         214ac8686952d260b0da86c75bc99a0d8f72c55b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 214ac86 Bump release and rebuild