/**
 * 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.hadoop.mapred;

import static org.junit.Assert.*;

import java.io.File;
import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.LocalDirAllocator;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RawLocalFileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.mapred.TaskTracker.LocalStorage;
import org.junit.Test;
import org.junit.Before;
import org.mockito.Mockito;

/**
 * Tests for the correct behavior of the TaskTracker starting up with
 * respect to its local-disk directories.
 */
public class TestTaskTrackerDirectories {
  private final String TEST_DIR = new File("build/test/testmapredlocaldir")
    .getAbsolutePath();
  
  @Before
  public void deleteTestDir() throws IOException {
    FileUtil.fullyDelete(new File(TEST_DIR));
    assertFalse("Could not delete " + TEST_DIR,
        new File(TEST_DIR).exists());
  }
  
  @Test
  public void testCreatesLocalDirs() throws Exception {
    Configuration conf = new Configuration();
    String[] dirs = new String[] {
        TEST_DIR + "/local1",
        TEST_DIR + "/local2"
    };
    
    conf.setStrings("mapred.local.dir", dirs);
    setupTaskTracker(conf);

    for (String dir : dirs) {
      checkDir(dir);
    }
  }
  
  @Test
  public void testFixesLocalDirPermissions() throws Exception {
    Configuration conf = new Configuration();
    String[] dirs = new String[] {
        TEST_DIR + "/badperms"
    };
    
    new File(dirs[0]).mkdirs();
    FileUtil.chmod(dirs[0], "000");

    conf.setStrings("mapred.local.dir", dirs);
    setupTaskTracker(conf);
    
    for (String dir : dirs) {
      checkDir(dir);
    }
  }
  
  @Test
  public void testCreatesLogDirs() throws Exception {
    String[] dirs = new String[] {
        TEST_DIR + "/local1",
        TEST_DIR + "/local2"
    };

    Path logDir1 = new Path(dirs[0], TaskLog.USERLOGS_DIR_NAME);
    Path logDir2 = new Path(dirs[1], TaskLog.USERLOGS_DIR_NAME);
    FileUtil.fullyDelete(new File(logDir1.toString()));
    FileUtil.fullyDelete(new File(logDir2.toString()));

    Configuration conf = new Configuration();
    conf.setStrings("mapred.local.dir", dirs);
    setupTaskTracker(conf);

    checkDir(logDir1.toString());
    checkDir(logDir2.toString());
  }
  
  @Test
  public void testFixesLogDirPermissions() throws Exception {
    String[] dirs = new String[] {
         TEST_DIR + "/local1"
    };
    File dir = new File(dirs[0]);
    FileUtil.fullyDelete(dir);
    dir.mkdirs();
    FileUtil.chmod(dir.getAbsolutePath(), "000");

    Configuration conf = new Configuration();
    conf.setStrings("mapred.local.dir", dirs);
    setupTaskTracker(conf);
    
    checkDir(dir.getAbsolutePath());
  }
  
  private void setupTaskTracker(Configuration conf) throws Exception {
    JobConf ttConf = new JobConf(conf);
    // Doesn't matter what we give here - we won't actually
    // connect to it.
    TaskTracker tt = new TaskTracker();
    tt.setConf(ttConf);
    tt.setTaskController(Mockito.mock(TaskController.class));
    LocalDirAllocator localDirAllocator = 
      new LocalDirAllocator("mapred.local.dir");
    tt.setLocalDirAllocator(localDirAllocator);
    LocalFileSystem localFs = FileSystem.getLocal(conf);
    LocalStorage localStorage = new LocalStorage(ttConf.getLocalDirs());
    localStorage.checkDirs(localFs, true);
    tt.setLocalStorage(localStorage);
    tt.setLocalFileSystem(localFs);
    tt.initializeDirectories();
  }

  private void checkDir(String dir) throws IOException {
    FileSystem fs = RawLocalFileSystem.get(new Configuration());
    File f = new File(dir);
    assertTrue(dir + " should exist", f.exists());
    FileStatus stat = fs.getFileStatus(new Path(dir));
    assertEquals(dir + " has correct permissions",
        0755, stat.getPermission().toShort());
  }
}