$ git clone -n https://src.fedoraproject.org/rpms/ocaml-compiler-libs-janestreet.git /var/lib/mock/f45-build-20496-571/root/chroot_tmpdir/scmroot/ocaml-compiler-libs-janestreet
Cloning into '/var/lib/mock/f45-build-20496-571/root/chroot_tmpdir/scmroot/ocaml-compiler-libs-janestreet'...
$ git fetch origin 5f71d2c38c9b6917738f8bb494958a8762fdeab7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-compiler-libs-janestreet
 * [new ref]         5f71d2c38c9b6917738f8bb494958a8762fdeab7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f71d2c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild