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 org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Options;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import javax.annotation.concurrent.ThreadSafe;

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

    /**
     * @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
    protected Options getOptions() {
        return new Options().addOption(PROPERTY_FILE_OPTION).addOption(READONLY_OPTION)
                .addOption(MOUNT_SHARED_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();

        String propertyFile = cl.getOptionValue('P');
        if (propertyFile != null) {
            Properties cmdProps = new Properties();
            try (InputStream inStream = new FileInputStream(propertyFile)) {
                cmdProps.load(inStream);
            } catch (IOException e) {
                throw new IOException("Unable to load property file: " + propertyFile);
            }

            if (!cmdProps.isEmpty()) {
                // Use the properties from the properties file for the mount options.
                Map<String, String> properties = new HashMap<>();
                for (Map.Entry<Object, Object> entry : cmdProps.entrySet()) {
                    properties.put(entry.getKey().toString(), entry.getValue().toString());
                }
                options.setProperties(properties);
                System.out.println("Using properties from file: " + propertyFile);
            }
        }

        if (cl.hasOption("readonly")) {
            options.setReadOnly(true);
        }

        if (cl.hasOption("shared")) {
            options.setShared(true);
        }

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

    @Override
    public String getUsage() {
        return "mount [-readonly] [-shared] [-P <properties file name>] <alluxioPath> <ufsURI>";
    }

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