$ git clone -n https://src.fedoraproject.org/rpms/ocaml-extlib.git /var/lib/mock/f45-build-20522-571/root/chroot_tmpdir/scmroot/ocaml-extlib
Cloning into '/var/lib/mock/f45-build-20522-571/root/chroot_tmpdir/scmroot/ocaml-extlib'...
$ git fetch origin 1233639948c86b0c7d91cfdbde294cfb41511014:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-extlib
 * [new ref]         1233639948c86b0c7d91cfdbde294cfb41511014 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1233639 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild