--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/lib/jdk/test/lib/util/FileUtils.java Tue May 30 14:56:43 2017 -0700
@@ -0,0 +1,229 @@
+/*
+ * Copyright (c) 2017, 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.test.lib.util;
+
+import jdk.test.lib.Platform;
+
+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 IS_WINDOWS = Platform.isWindows();
+ private static final int RETRY_DELETE_MILLIS = IS_WINDOWS ? 500 : 0;
+ private static final int MAX_RETRY_DELETE_TIMES = IS_WINDOWS ? 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<>() {
+ @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 (!IS_WINDOWS) {
+ // 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;
+ }
+}