public static boolean isForbiddenFolder(FileSystem fs, String path) {

        if (fs instanceof RemoteFileSystem) {

            RemoteFileSystem rfs = (RemoteFileSystem) fs;

            if (path.isEmpty()) {

                return true;

            }

            if (rfs.isAutoMount(path) || rfs.isProhibitedToEnter(path)) {

                return true;

            }

            int pos = path.lastIndexOf('/');

            if (pos > 0) {

                String parent = path.substring(0, pos);

                if (rfs.isAutoMount(parent) || rfs.isProhibitedToEnter(parent)) {

                    return true;

                }

            }

            return false;

            //return rfs.isAutoMount(path);

        }

        return false;

    }

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

 * License.  When distributing the software, include this License Header

 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

 * single choice of license, a recipient has the option to distribute

 * your version of this file under either the CDDL, the GPL Version 2 or

 * to extend the choice of license to its licensees as provided above.

 * However, if you add GPL Version 2 code and therefore, elected the GPL

 * Version 2 license, then the option applies only if the new code is

 * made subject to such option by the copyright holder.

 *

 * Contributor(s):

 */

package org.netbeans.modules.remotefs.versioning.impl;

import org.netbeans.modules.remote.impl.fileoperations.spi.RemoteVcsSupportUtil;

import org.netbeans.modules.remotefs.versioning.api.RemoteVcsSupport;

import org.netbeans.modules.versioning.core.api.VCSFileProxy;

import org.netbeans.modules.versioning.core.spi.VCSForbiddenFolderProvider;

import org.openide.filesystems.FileSystem;

import org.openide.util.lookup.ServiceProvider;

/**

 *

 * @author vkvashin

 */

@ServiceProvider(service = VCSForbiddenFolderProvider.class)

public class VCSForbiddenFolderProviderImpl implements VCSForbiddenFolderProvider {

    @Override

    public boolean isForbiddenFolder(VCSFileProxy folder) {

        FileSystem fs = RemoteVcsSupport.getFileSystem(folder);

        return RemoteVcsSupportUtil.isForbiddenFolder(fs, folder.getPath());

    }

}

import org.netbeans.modules.versioning.core.spi.VCSForbiddenFolderProvider;

        Collection<? extends VCSForbiddenFolderProvider> forbiddenFolderProviders = Lookup.getDefault().lookupAll(VCSForbiddenFolderProvider.class);

        for (VCSForbiddenFolderProvider provider : forbiddenFolderProviders) {

            if (provider.isForbiddenFolder(folder)) {

                return true;

            }

        }

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

 * License.  When distributing the software, include this License Header

 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

 * single choice of license, a recipient has the option to distribute

 * your version of this file under either the CDDL, the GPL Version 2 or

 * to extend the choice of license to its licensees as provided above.

 * However, if you add GPL Version 2 code and therefore, elected the GPL

 * Version 2 license, then the option applies only if the new code is

 * made subject to such option by the copyright holder.

 *

 * Contributor(s):

 */

package org.netbeans.modules.versioning.core.spi;

import org.netbeans.modules.versioning.core.api.VCSFileProxy;

public interface VCSForbiddenFolderProvider {

    /**

     * Some folders are special and versioning should not look for metadata in

     * them. Folders like /net with automount enabled may take a long time to

     * answer I/O on their children, so

     * <code>VCSFileProxy.exists("/net/.git")</code> will freeze until it timeouts.

     * This method is called from org.netbeans.modules.versioning.core.util.Utils.isForbiddenFolder()

     * This does not mean however that whole subtree should be excluded from version control, 

     * only that you should not look for the metadata directly in this folder.

     * Returns <code>true</code> if the given folder is among such folders.

     * @author vkvashin

     * @param folder a folder to query

     * @return <code>true</code> if the given folder should be skipped when

     * searching for metadata.

     * @since 1.19

     */

    boolean isForbiddenFolder (VCSFileProxy folder);

}