$ git clone -n https://src.fedoraproject.org/rpms/ocaml-extlib.git /var/lib/mock/f38-build-side-42-init-devel-800629-28144/root/chroot_tmpdir/scmroot/ocaml-extlib
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-800629-28144/root/chroot_tmpdir/scmroot/ocaml-extlib'...
$ git fetch origin 12d9a59252e3282f62558cca420eebec04a831a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-extlib
 * [new ref]         12d9a59252e3282f62558cca420eebec04a831a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12d9a59 Rebuild OCaml packages for F38