content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.cli.fs.command;
  
  import alluxio.AlluxioURI;
  import alluxio.annotation.PublicApi;
  import alluxio.cli.fsadmin.report.UfsCommand;
  import alluxio.client.file.FileSystemContext;
  import alluxio.exception.AlluxioException;
  import alluxio.exception.status.InvalidArgumentException;
  import alluxio.grpc.MountPOptions;
  import alluxio.wire.MountPointInfo;
  
  import com.google.common.collect.Maps;
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.Option;
  import org.apache.commons.cli.Options;
  
  import java.io.IOException;
  import java.util.Map;
  import java.util.Properties;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Mounts a UFS path onto an Alluxio path.
   */
  @ThreadSafe
  @PublicApi
  public final class MountCommand extends AbstractFileSystemCommand {
  
    private static final Option READONLY_OPTION =
        Option.builder()
            .longOpt("readonly")
            .required(false)
            .hasArg(false)
            .desc("mount point is readonly in Alluxio")
            .build();
    private static final Option SHARED_OPTION =
        Option.builder()
            .longOpt("shared")
            .required(false)
            .hasArg(false)
            .desc("mount point is shared")
            .build();
    private static final Option REMOUNT_OPTION =
        Option.builder()
            .longOpt("remount")
            .required(false)
            .hasArg(false)
            .desc("unmount and remount in one locked operation, with atomicity")
            .build();
    private static final Option OPTION_OPTION =
        Option.builder()
            .longOpt("option")
            .required(false)
            .hasArg(true)
            .numberOfArgs(2)
            .argName("key=value")
            .valueSeparator('=')
            .desc("options associated with this mount point")
            .build();
  
    /**
     * @param fsContext the filesystem of Alluxio
     */
    public MountCommand(FileSystemContext fsContext) {
      super(fsContext);
    }
  
    @Override
    public String getCommandName() {
      return "mount";
    }
  
    @Override
    public Options getOptions() {
      return new Options().addOption(READONLY_OPTION).addOption(SHARED_OPTION)
          .addOption(REMOUNT_OPTION).addOption(OPTION_OPTION);
    }
  
    @Override
    public int run(CommandLine cl) throws AlluxioException, IOException {
      String[] args = cl.getArgs();
      if (args.length == 0) {
        Map<String, MountPointInfo> mountTable = mFileSystem.getMountTable();
        UfsCommand.printMountInfo(mountTable);
        return 0;
      }
      AlluxioURI alluxioPath = new AlluxioURI(args[0]);
      AlluxioURI ufsPath = new AlluxioURI(args[1]);
      MountPOptions.Builder optionsBuilder = MountPOptions.newBuilder();
  
      if (cl.hasOption(READONLY_OPTION.getLongOpt())) {
        optionsBuilder.setReadOnly(true);
      }
      if (cl.hasOption(SHARED_OPTION.getLongOpt())) {
        optionsBuilder.setShared(true);
      }
      if (cl.hasOption(REMOUNT_OPTION.getLongOpt())) {
        optionsBuilder.setRemount(true);
      }
      if (cl.hasOption(OPTION_OPTION.getLongOpt())) {
        Properties properties = cl.getOptionProperties(OPTION_OPTION.getLongOpt());
        optionsBuilder.putAllProperties(Maps.fromProperties(properties));
      }
      mFileSystem.mount(alluxioPath, ufsPath, optionsBuilder.build());
      System.out.println("Mounted " + ufsPath + " at " + alluxioPath);
      return 0;
    }
  
    @Override
    public String getUsage() {
      return "mount [--readonly] [--shared] [--remount] [--option <key=val>] <alluxioPath> <ufsURI>";
    }
  
    @Override
    public String getDescription() {
      return "Mounts a UFS path onto an Alluxio path.";
    }
  
    @Override
    public void validateArgs(CommandLine cl) throws InvalidArgumentException {
      if (cl.getArgs().length != 2 && cl.getArgs().length != 0) {
        throw new InvalidArgumentException("Command mount takes 0 or 2 arguments, not " + cl
            .getArgs().length);
      }
    }
  }
  