$ git clone -n https://src.fedoraproject.org/rpms/ocaml-labltk.git /var/lib/mock/f39-build-1461318-33253/root/chroot_tmpdir/scmroot/ocaml-labltk
Cloning into '/var/lib/mock/f39-build-1461318-33253/root/chroot_tmpdir/scmroot/ocaml-labltk'...
$ git fetch origin 2cd4c8645ed4385824e2a354433a123109616c9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-labltk
 * [new ref]         2cd4c8645ed4385824e2a354433a123109616c9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cd4c86 Add devel package dependency on tcl-/tk-devel