content: //
  // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  //
  package org.apache.cloudstack.direct.download;
  
  import com.cloud.utils.Pair;
  import com.cloud.utils.UriUtils;
  import com.cloud.utils.exception.CloudRuntimeException;
  import com.cloud.utils.script.Script;
  
  import java.io.File;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.util.List;
  import java.util.UUID;
  
  public class NfsDirectTemplateDownloader extends DirectTemplateDownloaderImpl {
  
      private String srcHost;
      private String srcPath;
  
      private static final String mountCommand = "mount -t nfs %s %s";
  
      /**
       * Parse url and set srcHost and srcPath
       */
      private void parseUrl() {
          URI uri = null;
          String url = getUrl();
          try {
              uri = new URI(UriUtils.encodeURIComponent(url));
              if (uri.getScheme() != null && uri.getScheme().equalsIgnoreCase("nfs")) {
                  srcHost = uri.getHost();
                  srcPath = uri.getPath();
              }
          } catch (URISyntaxException e) {
              throw new CloudRuntimeException("Invalid NFS url " + url + " caused error: " + e.getMessage());
          }
      }
  
      protected NfsDirectTemplateDownloader(String url) {
          this(url, null, null, null, null);
      }
  
      public NfsDirectTemplateDownloader(String url, String destPool, Long templateId, String checksum,
                 String downloadPath) {
          super(url, destPool, templateId, checksum, downloadPath, false);
          parseUrl();
      }
  
      @Override
      public Pair<Boolean, String> downloadTemplate() {
          String mountSrcUuid = UUID.randomUUID().toString();
          String mount = String.format(mountCommand, srcHost + ":" + srcPath, "/mnt/" + mountSrcUuid);
          Script.runSimpleBashScript(mount);
          String downloadDir = getDestPoolPath() + File.separator + getDirectDownloadTempPath(getTemplateId());
          setDownloadedFilePath(downloadDir + File.separator + getFileNameFromUrl());
          Script.runSimpleBashScript("cp /mnt/" + mountSrcUuid + srcPath + " " + getDownloadedFilePath());
          Script.runSimpleBashScript("umount /mnt/" + mountSrcUuid);
          return new Pair<>(true, getDownloadedFilePath());
      }
  
      @Override
      public boolean checkUrl(String url) {
          try {
              parseUrl();
              return true;
          } catch (CloudRuntimeException e) {
              logger.error(String.format("Cannot check URL %s is reachable due to: %s", url, e.getMessage()), e);
              return false;
          }
      }
  
      @Override
      public Long getRemoteFileSize(String url, String format) {
          return null;
      }
  
      @Override
      public List<String> getMetalinkUrls(String metalinkUrl) {
          return null;
      }
  
      @Override
      public List<String> getMetalinkChecksums(String metalinkUrl) {
          return null;
      }
  }
  