hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSymlinkHdfsDisable.java

/**
 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.hadoop.fs;

import static org.junit.Assert.fail;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Test;

public class TestSymlinkHdfsDisable {

  @Test(timeout=60000)
  public void testSymlinkHdfsDisable() throws Exception {
    Configuration conf = new HdfsConfiguration();
    // disable symlink resolution
    conf.setBoolean(
        CommonConfigurationKeys.FS_CLIENT_RESOLVE_REMOTE_SYMLINKS_KEY, false);
    // spin up minicluster, get dfs and filecontext
    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
    DistributedFileSystem dfs = cluster.getFileSystem();
    FileContext fc = FileContext.getFileContext(cluster.getURI(0), conf);
    // Create test files/links
    FileContextTestHelper helper = new FileContextTestHelper(
        "/tmp/TestSymlinkHdfsDisable");
    Path root = helper.getTestRootPath(fc);
    Path target = new Path(root, "target");
    Path link = new Path(root, "link");
    DFSTestUtil.createFile(dfs, target, 4096, (short)1, 0xDEADDEAD);
    fc.createSymlink(target, link, false);

    // Try to resolve links with FileSystem and FileContext
    try {
      fc.open(link);
      fail("Expected error when attempting to resolve link");
    } catch (IOException e) {
      GenericTestUtils.assertExceptionContains("resolution is disabled", e);
    }
    try {
      dfs.open(link);
      fail("Expected error when attempting to resolve link");
    } catch (IOException e) {
      GenericTestUtils.assertExceptionContains("resolution is disabled", e);
    }
  }
}