util.c

                                         (*vsn_hooks->auto_versionable)(resource),
                                         &lockdb, &checkout_resource)) != NULL) {
            goto done;
        }

        if (!checkout_resource) {
            err = dav_new_error(r->pool, HTTP_CONFLICT, 0, 0,
                                "<DAV:cannot-modify-version-controlled-content>");
            goto done;
        }

        /* Auto-versioning can only be applied to version selectors, so
         * no separate working resource will be created. */
        if ((err = (*vsn_hooks->checkout)(resource, 1 /*auto_checkout*/,
                                          0, 0, 0, NULL, NULL))
            != NULL)
        {
            err = dav_push_error(r->pool, HTTP_CONFLICT, 0,
                                 apr_psprintf(r->pool,
                                             "Unable to checkout resource %s.",
                                             ap_escape_html(r->pool, resource->uri)),
                                 err);
            goto done;
        }

        /* remember that resource was checked out */
        av_info->resource_checkedout = 1;
    }

done:

    /* make sure lock database is closed */
    if (lockdb != NULL)
        (*lockdb->hooks->close_lockdb)(lockdb);

    /* if an error occurred, undo any auto-versioning operations already done */
    if (err != NULL) {
        dav_auto_checkin(r, resource, 1 /*undo*/, 0 /*unlock*/, av_info);
        return err;
    }

    return NULL;
}

/* see mod_dav.h for docco */
DAV_DECLARE(dav_error *) dav_auto_checkin(
    request_rec *r,
    dav_resource *resource,
    int undo,
    int unlock,
    dav_auto_version_info *av_info)
{
    const dav_hooks_vsn *vsn_hooks = DAV_GET_HOOKS_VSN(r);
    dav_error *err = NULL;
    dav_auto_version auto_version;

    /* If no versioning provider, this is a no-op */
    if (vsn_hooks == NULL)
        return NULL;

    /* If undoing auto-checkouts, then do uncheckouts */
    if (undo) {
        if (resource != NULL) {
            if (av_info->resource_checkedout) {
                if ((err = (*vsn_hooks->uncheckout)(resource)) != NULL) {
                    return dav_push_error(r->pool, HTTP_INTERNAL_SERVER_ERROR, 0,
                                          apr_psprintf(r->pool,
                                                      "Unable to undo auto-checkout "
                                                      "of resource %s.",
                                                      ap_escape_html(r->pool, resource->uri)),
                                          err);
                }
            }

            if (av_info->resource_versioned) {
                dav_response *response;

                /* ### should we do anything with the response? */
                if ((err = (*resource->hooks->remove_resource)(resource,
                                                               &response)) != NULL) {
                    return dav_push_error(r->pool, HTTP_INTERNAL_SERVER_ERROR, 0,
                                          apr_psprintf(r->pool,
                                                      "Unable to undo auto-version-control "
                                                      "of resource %s.",
                                                      ap_escape_html(r->pool, resource->uri)),
                                          err);
                }
            }
        }

        if (av_info->parent_resource != NULL && av_info->parent_checkedout) {
            if ((err = (*vsn_hooks->uncheckout)(av_info->parent_resource)) != NULL) {
                return dav_push_error(r->pool, HTTP_INTERNAL_SERVER_ERROR, 0,
                                      apr_psprintf(r->pool,
                                                  "Unable to undo auto-checkout "
                                                  "of parent collection %s.",
                                                  ap_escape_html(r->pool, av_info->parent_resource->uri)),
                                      err);
            }
        }

        return NULL;
    }

    /* If the resource was checked out, and auto-checkin is enabled,
     * then check it in.
     */
    if (resource != NULL && resource->working
        && (unlock || av_info->resource_checkedout)) {

        auto_version = (*vsn_hooks->auto_versionable)(resource);

        if (auto_version == DAV_AUTO_VERSION_ALWAYS ||
            (unlock && (auto_version == DAV_AUTO_VERSION_LOCKED))) {

            if ((err = (*vsn_hooks->checkin)(resource,
                                             0 /*keep_checked_out*/, NULL))
                != NULL) {
                return dav_push_error(r->pool, HTTP_INTERNAL_SERVER_ERROR, 0,
                                      apr_psprintf(r->pool,
                                                  "Unable to auto-checkin resource %s.",
                                                  ap_escape_html(r->pool, resource->uri)),
                                      err);
            }
        }
    }

    /* If parent resource was checked out, and auto-checkin is enabled,
     * then check it in.
     */
    if (!unlock
        && av_info->parent_checkedout
        && av_info->parent_resource != NULL
        && av_info->parent_resource->working) {

        auto_version = (*vsn_hooks->auto_versionable)(av_info->parent_resource);

        if (auto_version == DAV_AUTO_VERSION_ALWAYS) {
            if ((err = (*vsn_hooks->checkin)(av_info->parent_resource,
                                             0 /*keep_checked_out*/, NULL))
                != NULL) {
                return dav_push_error(r->pool, HTTP_INTERNAL_SERVER_ERROR, 0,
                                      apr_psprintf(r->pool,
                                                  "Unable to auto-checkin parent collection %s.",
                                                  ap_escape_html(r->pool, av_info->parent_resource->uri)),
                                                  err);
            }
        }
    }

    return NULL;
}