$ git clone -n https://src.fedoraproject.org/rpms/ocaml-migrate-parsetree.git /var/lib/mock/f38-build-side-42-init-devel-637361-26384/root/chroot_tmpdir/scmroot/ocaml-migrate-parsetree
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-637361-26384/root/chroot_tmpdir/scmroot/ocaml-migrate-parsetree'...
$ git fetch origin 3aac9760e8e08f6a139a38255a2d2e75c6372bec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-migrate-parsetree
 * [new ref]         3aac9760e8e08f6a139a38255a2d2e75c6372bec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3aac976 Rebuild OCaml packages for F38