alluxio.shell.command.MountCommand.java Source code

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Here is the source code for alluxio.shell.command.MountCommand.java

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/*
 * 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.shell.command;

import alluxio.AlluxioURI;
import alluxio.client.file.FileSystem;
import alluxio.client.file.options.MountOptions;
import alluxio.exception.AlluxioException;

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.Properties;

import javax.annotation.concurrent.ThreadSafe;

/**
 * Mounts a UFS path onto an Alluxio path.
 */
@ThreadSafe
public final class MountCommand extends AbstractShellCommand {

    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 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 fs the filesystem of Alluxio
     */
    public MountCommand(FileSystem fs) {
        super(fs);
    }

    @Override
    public String getCommandName() {
        return "mount";
    }

    @Override
    protected int getNumOfArgs() {
        return 2;
    }

    @Override
    public Options getOptions() {
        return new Options().addOption(READONLY_OPTION).addOption(SHARED_OPTION).addOption(OPTION_OPTION);
    }

    @Override
    public int run(CommandLine cl) throws AlluxioException, IOException {
        String[] args = cl.getArgs();
        AlluxioURI alluxioPath = new AlluxioURI(args[0]);
        AlluxioURI ufsPath = new AlluxioURI(args[1]);
        MountOptions options = MountOptions.defaults();

        if (cl.hasOption(READONLY_OPTION.getLongOpt())) {
            options.setReadOnly(true);
        }
        if (cl.hasOption(SHARED_OPTION.getLongOpt())) {
            options.setShared(true);
        }
        if (cl.hasOption(OPTION_OPTION.getLongOpt())) {
            Properties properties = cl.getOptionProperties(OPTION_OPTION.getLongOpt());
            options.setProperties(Maps.fromProperties(properties));
        }

        mFileSystem.mount(alluxioPath, ufsPath, options);
        System.out.println("Mounted " + ufsPath + " at " + alluxioPath);
        return 0;
    }

    @Override
    public String getUsage() {
        return "mount [--readonly] [--shared] [--option <key=val>] <alluxioPath> <ufsURI>";
    }

    @Override
    public String getDescription() {
        return "Mounts a UFS path onto an Alluxio path.";
    }
}