static gboolean
dispatch_open (OstreeRepo                 *repo,
               StaticDeltaExecutionState  *state,
               GCancellable               *cancellable,  
               GError                    **error)
{
  gboolean ret = FALSE;

  g_assert (state->output_target == NULL);
  /* FIXME - lift this restriction */
  if (!state->stats_only)
    {
      g_assert (repo->mode == OSTREE_REPO_MODE_BARE ||
                repo->mode == OSTREE_REPO_MODE_BARE_USER ||
                repo->mode == OSTREE_REPO_MODE_BARE_USER_ONLY);
    }
  
  if (!open_output_target (state, cancellable, error))
    goto out;

  if (!do_content_open_generic (repo, state, cancellable, error))
    goto out;

  if (!read_varuint64 (state, &state->content_size, error))
    goto out;

  if (state->stats_only)
    {
      ret = TRUE;
      goto out;
    }
  
  if (!_ostree_repo_open_content_bare (repo, state->checksum,
                                       state->content_size,
                                       &state->barecommitstate,
                                       &state->content_out,
                                       &state->have_obj,
                                       cancellable, error))
    goto out;

  if (!handle_untrusted_content_checksum (repo, state, cancellable, error))
    goto out;

  ret = TRUE;
 out:
  if (!ret)
    g_prefix_error (error, "opcode open: ");
  return ret;
}
static gboolean
dispatch_open_splice_and_close (OstreeRepo                 *repo,
                                StaticDeltaExecutionState  *state,
                                GCancellable               *cancellable,  
                                GError                    **error)
{
  gboolean ret = FALSE;

  if (!open_output_target (state, cancellable, error))
    goto out;

  if (OSTREE_OBJECT_TYPE_IS_META (state->output_objtype))
    {
      g_autoptr(GVariant) metadata = NULL;
      guint64 offset;
      guint64 length;

      if (!read_varuint64 (state, &length, error))
        goto out;
      if (!read_varuint64 (state, &offset, error))
        goto out;
      if (!validate_ofs (state, offset, length, error))
        goto out;

      if (state->stats_only)
        {
          ret = TRUE;
          goto out;
        }
      
      metadata = g_variant_new_from_data (ostree_metadata_variant_type (state->output_objtype),
                                          state->payload_data + offset, length, TRUE, NULL, NULL);

      {
        g_autofree guchar *actual_csum = NULL;

        if (!ostree_repo_write_metadata (state->repo, state->output_objtype,
                                         state->checksum,
                                         metadata, &actual_csum,
                                         cancellable,
                                         error))
          goto out;
      }
    }
  else
    {
      guint64 content_offset;
      guint64 objlen;
      g_autoptr(GInputStream) object_input = NULL;
      g_autoptr(GInputStream) memin = NULL;
      
      if (!do_content_open_generic (repo, state, cancellable, error))
        goto out;

      if (!read_varuint64 (state, &state->content_size, error))
        goto out;
      if (!read_varuint64 (state, &content_offset, error))
        goto out;
      if (!validate_ofs (state, content_offset, state->content_size, error))
        goto out;
      
      if (state->stats_only)
        {
          ret = TRUE;
          goto out;
        }

      /* Fast path for regular files to bare repositories */
      if (S_ISREG (state->mode) && 
          (repo->mode == OSTREE_REPO_MODE_BARE ||
           repo->mode == OSTREE_REPO_MODE_BARE_USER))
        {
          if (!_ostree_repo_open_content_bare (repo, state->checksum,
                                               state->content_size,
                                               &state->barecommitstate,
                                               &state->content_out,
                                               &state->have_obj,
                                               cancellable, error))
            goto out;

          if (!state->have_obj)
            {
              if (!handle_untrusted_content_checksum (repo, state, cancellable, error))
                goto out;

              if (!content_out_write (repo, state,
                                      state->payload_data + content_offset,
                                      state->content_size,
                                      cancellable, error))
                goto out;
            }
        }
      else
        {
          /* Slower path, for symlinks and unpacking deltas into archive-z2 */
          g_autoptr(GFileInfo) finfo = NULL;
      
          finfo = _ostree_header_gfile_info_new (state->mode, state->uid, state->gid);

          if (S_ISLNK (state->mode))
            {
              g_autofree char *nulterminated_target =
                g_strndup ((char*)state->payload_data + content_offset, state->content_size);
              g_file_info_set_symlink_target (finfo, nulterminated_target);
            }
          else
            {
              g_assert (S_ISREG (state->mode));
              g_file_info_set_size (finfo, state->content_size);
              memin = g_memory_input_stream_new_from_data (state->payload_data + content_offset, state->content_size, NULL);
            }

          if (!ostree_raw_file_to_content_stream (memin, finfo, state->xattrs,
                                                  &object_input, &objlen,
                                                  cancellable, error))
            goto out;

          {
            g_autofree guchar *actual_csum = NULL;
            if (!ostree_repo_write_content (state->repo,
                                            state->checksum,
                                            object_input,
                                            objlen,
                                            &actual_csum,
                                            cancellable,
                                            error))
              goto out;
          }
        }
    }

  if (!dispatch_close (repo, state, cancellable, error))
    goto out;

  ret = TRUE;
 out:
  if (state->stats_only)
    (void) dispatch_close (repo, state, cancellable, NULL);
  if (!ret)
    g_prefix_error (error, "opcode open-splice-and-close: ");
  return ret;
}