task.from(generateDocinfo);

            // TODO: This should be available on a Copy task.
            DirectoryProperty flattenedAsciidocDirectory = project.getObjects().directoryProperty();
            flattenedAsciidocDirectory.set(extension.getUserManual().getStagingRoot().dir("raw"));
            task.getOutputs().dir(flattenedAsciidocDirectory);

            log.debug("Initial session preauth hash " + Hexdump.toHexString(this.preauthIntegrityHash));
        }

        while (true) {
            Subject s = this.credentials.getSubject();
            if (ctx == null) {
                ctx = createContext(trans, tdomain, negoResp, !anonymous, s);
            }
            token = createToken(ctx, token, s);

            if (token != null) {

        if (t.isAssignableFrom(this.getClass())) {
            return (T) this;
        }
        return null;
    }

    @Override
    public Subject getSubject() {
        return null;
    }

    @Override
    public void refresh() throws CIFSException {
    }

    /**
     *
     * {@inheritDoc}
     *