/**
* 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.fs;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.After;
import org.junit.Assert;
import org.junit.Test;
public class TestFileUtil {
private static final Log LOG = LogFactory.getLog(TestFileUtil.class);
final static private File TEST_DIR = new File(System.getProperty(
"test.build.data", "/tmp"), "fu");
private static String FILE = "x";
private static String LINK = "y";
private static String DIR = "dir";
private File del = new File(TEST_DIR, "del");
private File tmp = new File(TEST_DIR, "tmp");
/**
* Creates directories del and tmp for testing.
*
* Contents of them are
* dir:tmp:
* file: x
* dir:del:
* file: x
* dir: dir1 : file:x
* dir: dir2 : file:x
* link: y to tmp/x
* link: tmpDir to tmp
*/
private void setupDirs() throws IOException {
Assert.assertFalse(del.exists());
Assert.assertFalse(tmp.exists());
del.mkdirs();
tmp.mkdirs();
new File(del, FILE).createNewFile();
File tmpFile = new File(tmp, FILE);
tmpFile.createNewFile();
// create directories
File one = new File(del, DIR + "1");
one.mkdirs();
File two = new File(del, DIR + "2");
two.mkdirs();
new File(one, FILE).createNewFile();
new File(two, FILE).createNewFile();
// create a symlink to file
File link = new File(del, LINK);
FileUtil.symLink(tmpFile.toString(), link.toString());
// create a symlink to dir
File linkDir = new File(del, "tmpDir");
FileUtil.symLink(tmp.toString(), linkDir.toString());
Assert.assertEquals(5, del.listFiles().length);
}
@After
public void tearDown() throws IOException {
FileUtil.fullyDelete(del);
FileUtil.fullyDelete(tmp);
}
@Test
public void testFullyDelete() throws IOException {
setupDirs();
boolean ret = FileUtil.fullyDelete(del);
Assert.assertTrue(ret);
Assert.assertFalse(del.exists());
validateTmpDir();
}
@Test
public void testFullyDeleteContents() throws IOException {
setupDirs();
boolean ret = FileUtil.fullyDeleteContents(del);
Assert.assertTrue(ret);
Assert.assertTrue(del.exists());
Assert.assertEquals(0, del.listFiles().length);
validateTmpDir();
}
private void validateTmpDir() {
Assert.assertTrue(tmp.exists());
Assert.assertEquals(1, tmp.listFiles().length);
Assert.assertTrue(new File(tmp, FILE).exists());
}
private File xSubDir = new File(del, "xsubdir");
private File ySubDir = new File(del, "ysubdir");
static String file1Name = "file1";
private File file2 = new File(xSubDir, "file2");
private File file3 = new File(ySubDir, "file3");
private File zlink = new File(del, "zlink");
/**
* Creates a directory which can not be deleted completely.
*
* Directory structure. The naming is important in that {@link MyFile}
* is used to return them in alphabetical order when listed.
*
* del(+w)
* |
* .---------------------------------------,
* | | | |
* file1(!w) xsubdir(-w) ysubdir(+w) zlink
* | |
* file2 file3
*
* @throws IOException
*/
private void setupDirsAndNonWritablePermissions() throws IOException {
Assert.assertFalse("The directory del should not have existed!",
del.exists());
del.mkdirs();
new MyFile(del, file1Name).createNewFile();
// "file1" is non-deletable by default, see MyFile.delete().
xSubDir.mkdirs();
file2.createNewFile();
xSubDir.setWritable(false);
ySubDir.mkdirs();
file3.createNewFile();
Assert.assertFalse("The directory tmp should not have existed!",
tmp.exists());
tmp.mkdirs();
File tmpFile = new File(tmp, FILE);
tmpFile.createNewFile();
FileUtil.symLink(tmpFile.toString(), zlink.toString());
}
// Validates the return value.
// Validates the existence of directory "xsubdir" and the file "file1"
// Sets writable permissions for the non-deleted dir "xsubdir" so that it can
// be deleted in tearDown().
private void validateAndSetWritablePermissions(boolean ret) {
xSubDir.setWritable(true);
Assert.assertFalse("The return value should have been false!", ret);
Assert.assertTrue("The file file1 should not have been deleted!",
new File(del, file1Name).exists());
Assert.assertTrue(
"The directory xsubdir should not have been deleted!",
xSubDir.exists());
Assert.assertTrue("The file file2 should not have been deleted!",
file2.exists());
Assert.assertFalse("The directory ysubdir should have been deleted!",
ySubDir.exists());
Assert.assertFalse("The link zlink should have been deleted!",
zlink.exists());
}
@Test
public void testFailFullyDelete() throws IOException {
LOG.info("Running test to verify failure of fullyDelete()");
setupDirsAndNonWritablePermissions();
boolean ret = FileUtil.fullyDelete(new MyFile(del));
validateAndSetWritablePermissions(ret);
}
/**
* Extend {@link File}. Same as {@link File} except for two things: (1) This
* treats file1Name as a very special file which is not delete-able
* irrespective of it's parent-dir's permissions, a peculiar file instance for
* testing. (2) It returns the files in alphabetically sorted order when
* listed.
*
*/
public static class MyFile extends File {
private static final long serialVersionUID = 1L;
public MyFile(File f) {
super(f.getAbsolutePath());
}
public MyFile(File parent, String child) {
super(parent, child);
}
/**
* Same as {@link File#delete()} except for file1Name which will never be
* deleted (hard-coded)
*/
@Override
public boolean delete() {
LOG.info("Trying to delete myFile " + getAbsolutePath());
boolean bool = false;
if (getName().equals(file1Name)) {
bool = false;
} else {
bool = super.delete();
}
if (bool) {
LOG.info("Deleted " + getAbsolutePath() + " successfully");
} else {
LOG.info("Cannot delete " + getAbsolutePath());
}
return bool;
}
/**
* Return the list of files in an alphabetically sorted order
*/
@Override
public File[] listFiles() {
File[] files = super.listFiles();
List<File> filesList = Arrays.asList(files);
Collections.sort(filesList);
File[] myFiles = new MyFile[files.length];
int i=0;
for(File f : filesList) {
myFiles[i++] = new MyFile(f);
}
return myFiles;
}
}
@Test
public void testFailFullyDeleteContents() throws IOException {
LOG.info("Running test to verify failure of fullyDeleteContents()");
setupDirsAndNonWritablePermissions();
boolean ret = FileUtil.fullyDeleteContents(new MyFile(del));
validateAndSetWritablePermissions(ret);
}
}