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/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.testlibrary;
import java.io.IOException;
import java.nio.file.DirectoryNotEmptyException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
* Common library for various test file utility functions.
*/
public final class FileUtils {
private static final boolean isWindows =
System.getProperty("os.name").startsWith("Windows");
private static final int RETRY_DELETE_MILLIS = isWindows ? 500 : 0;
private static final int MAX_RETRY_DELETE_TIMES = isWindows ? 15 : 0;
/**
* Deletes a file, retrying if necessary.
*
* @param path the file to delete
*
* @throws NoSuchFileException
* if the file does not exist (optional specific exception)
* @throws DirectoryNotEmptyException
* if the file is a directory and could not otherwise be deleted
* because the directory is not empty (optional specific exception)
* @throws IOException
* if an I/O error occurs
*/
public static void deleteFileWithRetry(Path path)
throws IOException
{
try {
deleteFileWithRetry0(path);
} catch (InterruptedException x) {
throw new IOException("Interrupted while deleting.", x);
}
}
/**
* Deletes a file, retrying if necessary.
* No exception thrown if file doesn't exist.
*
* @param path the file to delete
*
* @throws NoSuchFileException
* if the file does not exist (optional specific exception)
* @throws DirectoryNotEmptyException
* if the file is a directory and could not otherwise be deleted
* because the directory is not empty (optional specific exception)
* @throws IOException
* if an I/O error occurs
*/
public static void deleteFileIfExistsWithRetry(Path path)
throws IOException
{
try {
if(Files.exists(path))
deleteFileWithRetry0(path);
} catch (InterruptedException x) {
throw new IOException("Interrupted while deleting.", x);
}
}
private static void deleteFileWithRetry0(Path path)
throws IOException, InterruptedException
{
int times = 0;
IOException ioe = null;
while (true) {
try {
Files.delete(path);
while (Files.exists(path)) {
times++;
if (times > MAX_RETRY_DELETE_TIMES)
throw new IOException("File still exists after " + times + " waits.");
Thread.sleep(RETRY_DELETE_MILLIS);
}
break;
} catch (NoSuchFileException | DirectoryNotEmptyException x) {
throw x;
} catch (IOException x) {
// Backoff/retry in case another process is accessing the file
times++;
if (ioe == null)
ioe = x;
else
ioe.addSuppressed(x);
if (times > MAX_RETRY_DELETE_TIMES)
throw ioe;
Thread.sleep(RETRY_DELETE_MILLIS);
}
}
}
/**
* Deletes a directory and its subdirectories, retrying if necessary.
*
* @param dir the directory to delete
*
* @throws IOException
* If an I/O error occurs. Any such exceptions are caught
* internally. If only one is caught, then it is re-thrown.
* If more than one exception is caught, then the second and
* following exceptions are added as suppressed exceptions of the
* first one caught, which is then re-thrown.
*/
public static void deleteFileTreeWithRetry(Path dir)
throws IOException
{
IOException ioe = null;
final List<IOException> excs = deleteFileTreeUnchecked(dir);
if (!excs.isEmpty()) {
ioe = excs.remove(0);
for (IOException x : excs)
ioe.addSuppressed(x);
}
if (ioe != null)
throw ioe;
}
public static List<IOException> deleteFileTreeUnchecked(Path dir) {
final List<IOException> excs = new ArrayList<>();
try {
java.nio.file.Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
try {
deleteFileWithRetry0(file);
} catch (IOException x) {
excs.add(x);
} catch (InterruptedException x) {
excs.add(new IOException("Interrupted while deleting.", x));
return FileVisitResult.TERMINATE;
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
try {
deleteFileWithRetry0(dir);
} catch (IOException x) {
excs.add(x);
} catch (InterruptedException x) {
excs.add(new IOException("Interrupted while deleting.", x));
return FileVisitResult.TERMINATE;
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(Path file, IOException exc) {
excs.add(exc);
return FileVisitResult.CONTINUE;
}
});
} catch (IOException x) {
excs.add(x);
}
return excs;
}
/**
* Checks whether all file systems are accessible. This is performed
* by checking free disk space on all mounted file systems via a
* separate, spawned process. File systems are considered to be
* accessible if this process completes successfully before a given
* fixed duration has elapsed.
*
* @implNote On Unix this executes the {@code df} command in a separate
* process and on Windows always returns {@code true}.
*/
public static boolean areFileSystemsAccessible() throws IOException {
boolean areFileSystemsAccessible = true;
if (!isWindows) {
// try to check whether 'df' hangs
System.out.println("\n--- df output ---");
System.out.flush();
Process proc = new ProcessBuilder("df").inheritIO().start();
try {
proc.waitFor(90, TimeUnit.SECONDS);
} catch (InterruptedException ignored) {
}
try {
int exitValue = proc.exitValue();
if (exitValue != 0) {
System.err.printf("df process exited with %d != 0%n",
exitValue);
areFileSystemsAccessible = false;
}
} catch (IllegalThreadStateException ignored) {
System.err.println("df command apparently hung");
areFileSystemsAccessible = false;
}
}
return areFileSystemsAccessible;
}
}
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