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/**
* 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.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.URI;
import java.net.UnknownHostException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.StandardCharsets;
import java.nio.file.AccessDeniedException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.jar.Attributes;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import java.util.zip.GZIPInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
import org.apache.commons.collections.map.CaseInsensitiveMap;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.nativeio.NativeIO;
import org.apache.hadoop.util.Shell;
import org.apache.hadoop.util.Shell.ShellCommandExecutor;
import org.apache.hadoop.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A collection of file-processing util methods
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class FileUtil {
private static final Logger LOG = LoggerFactory.getLogger(FileUtil.class);
/* The error code is defined in winutils to indicate insufficient
* privilege to create symbolic links. This value need to keep in
* sync with the constant of the same name in:
* "src\winutils\common.h"
* */
public static final int SYMLINK_NO_PRIVILEGE = 2;
/**
* Buffer size for copy the content of compressed file to new file.
*/
private static final int BUFFER_SIZE = 8_192;
/**
* convert an array of FileStatus to an array of Path
*
* @param stats
* an array of FileStatus objects
* @return an array of paths corresponding to the input
*/
public static Path[] stat2Paths(FileStatus[] stats) {
if (stats == null)
return null;
Path[] ret = new Path[stats.length];
for (int i = 0; i < stats.length; ++i) {
ret[i] = stats[i].getPath();
}
return ret;
}
/**
* convert an array of FileStatus to an array of Path.
* If stats if null, return path
* @param stats
* an array of FileStatus objects
* @param path
* default path to return in stats is null
* @return an array of paths corresponding to the input
*/
public static Path[] stat2Paths(FileStatus[] stats, Path path) {
if (stats == null)
return new Path[]{path};
else
return stat2Paths(stats);
}
/**
* Register all files recursively to be deleted on exit.
* @param file File/directory to be deleted
*/
public static void fullyDeleteOnExit(final File file) {
file.deleteOnExit();
if (file.isDirectory()) {
File[] files = file.listFiles();
if (files != null) {
for (File child : files) {
fullyDeleteOnExit(child);
}
}
}
}
/**
* Delete a directory and all its contents. If
* we return false, the directory may be partially-deleted.
* (1) If dir is symlink to a file, the symlink is deleted. The file pointed
* to by the symlink is not deleted.
* (2) If dir is symlink to a directory, symlink is deleted. The directory
* pointed to by symlink is not deleted.
* (3) If dir is a normal file, it is deleted.
* (4) If dir is a normal directory, then dir and all its contents recursively
* are deleted.
*/
public static boolean fullyDelete(final File dir) {
return fullyDelete(dir, false);
}
/**
* Delete a directory and all its contents. If
* we return false, the directory may be partially-deleted.
* (1) If dir is symlink to a file, the symlink is deleted. The file pointed
* to by the symlink is not deleted.
* (2) If dir is symlink to a directory, symlink is deleted. The directory
* pointed to by symlink is not deleted.
* (3) If dir is a normal file, it is deleted.
* (4) If dir is a normal directory, then dir and all its contents recursively
* are deleted.
* @param dir the file or directory to be deleted
* @param tryGrantPermissions true if permissions should be modified to delete a file.
* @return true on success false on failure.
*/
public static boolean fullyDelete(final File dir, boolean tryGrantPermissions) {
if (tryGrantPermissions) {
// try to chmod +rwx the parent folder of the 'dir':
File parent = dir.getParentFile();
grantPermissions(parent);
}
if (deleteImpl(dir, false)) {
// dir is (a) normal file, (b) symlink to a file, (c) empty directory or
// (d) symlink to a directory
return true;
}
// handle nonempty directory deletion
if (!fullyDeleteContents(dir, tryGrantPermissions)) {
return false;
}
return deleteImpl(dir, true);
}
/**
* Returns the target of the given symlink. Returns the empty string if
* the given path does not refer to a symlink or there is an error
* accessing the symlink.
* @param f File representing the symbolic link.
* @return The target of the symbolic link, empty string on error or if not
* a symlink.
*/
public static String readLink(File f) {
/* NB: Use readSymbolicLink in java.nio.file.Path once available. Could
* use getCanonicalPath in File to get the target of the symlink but that
* does not indicate if the given path refers to a symlink.
*/
if (f == null) {
LOG.warn("Can not read a null symLink");
return "";
}
try {
return Shell.execCommand(
Shell.getReadlinkCommand(f.toString())).trim();
} catch (IOException x) {
return "";
}
}
/*
* Pure-Java implementation of "chmod +rwx f".
*/
private static void grantPermissions(final File f) {
FileUtil.setExecutable(f, true);
FileUtil.setReadable(f, true);
FileUtil.setWritable(f, true);
}
private static boolean deleteImpl(final File f, final boolean doLog) {
if (f == null) {
LOG.warn("null file argument.");
return false;
}
final boolean wasDeleted = f.delete();
if (wasDeleted) {
return true;
}
final boolean ex = f.exists();
if (doLog && ex) {
LOG.warn("Failed to delete file or dir ["
+ f.getAbsolutePath() + "]: it still exists.");
}
return !ex;
}
/**
* Delete the contents of a directory, not the directory itself. If
* we return false, the directory may be partially-deleted.
* If dir is a symlink to a directory, all the contents of the actual
* directory pointed to by dir will be deleted.
*/
public static boolean fullyDeleteContents(final File dir) {
return fullyDeleteContents(dir, false);
}
/**
* Delete the contents of a directory, not the directory itself. If
* we return false, the directory may be partially-deleted.
* If dir is a symlink to a directory, all the contents of the actual
* directory pointed to by dir will be deleted.
* @param tryGrantPermissions if 'true', try grant +rwx permissions to this
* and all the underlying directories before trying to delete their contents.
*/
public static boolean fullyDeleteContents(final File dir, final boolean tryGrantPermissions) {
if (tryGrantPermissions) {
// to be able to list the dir and delete files from it
// we must grant the dir rwx permissions:
grantPermissions(dir);
}
boolean deletionSucceeded = true;
final File[] contents = dir.listFiles();
if (contents != null) {
for (int i = 0; i < contents.length; i++) {
if (contents[i].isFile()) {
if (!deleteImpl(contents[i], true)) {// normal file or symlink to another file
deletionSucceeded = false;
continue; // continue deletion of other files/dirs under dir
}
} else {
// Either directory or symlink to another directory.
// Try deleting the directory as this might be a symlink
boolean b = false;
b = deleteImpl(contents[i], false);
if (b){
//this was indeed a symlink or an empty directory
continue;
}
// if not an empty directory or symlink let
// fullydelete handle it.
if (!fullyDelete(contents[i], tryGrantPermissions)) {
deletionSucceeded = false;
// continue deletion of other files/dirs under dir
}
}
}
}
return deletionSucceeded;
}
/**
* Recursively delete a directory.
*
* @param fs {@link FileSystem} on which the path is present
* @param dir directory to recursively delete
* @throws IOException
* @deprecated Use {@link FileSystem#delete(Path, boolean)}
*/
@Deprecated
public static void fullyDelete(FileSystem fs, Path dir)
throws IOException {
fs.delete(dir, true);
}
//
// If the destination is a subdirectory of the source, then
// generate exception
//
private static void checkDependencies(FileSystem srcFS,
Path src,
FileSystem dstFS,
Path dst)
throws IOException {
if (srcFS == dstFS) {
String srcq = srcFS.makeQualified(src).toString() + Path.SEPARATOR;
String dstq = dstFS.makeQualified(dst).toString() + Path.SEPARATOR;
if (dstq.startsWith(srcq)) {
if (srcq.length() == dstq.length()) {
throw new IOException("Cannot copy " + src + " to itself.");
} else {
throw new IOException("Cannot copy " + src + " to its subdirectory " +
dst);
}
}
}
}
/** Copy files between FileSystems. */
public static boolean copy(FileSystem srcFS, Path src,
FileSystem dstFS, Path dst,
boolean deleteSource,
Configuration conf) throws IOException {
return copy(srcFS, src, dstFS, dst, deleteSource, true, conf);
}
public static boolean copy(FileSystem srcFS, Path[] srcs,
FileSystem dstFS, Path dst,
boolean deleteSource,
boolean overwrite, Configuration conf)
throws IOException {
boolean gotException = false;
boolean returnVal = true;
StringBuilder exceptions = new StringBuilder();
if (srcs.length == 1)
return copy(srcFS, srcs[0], dstFS, dst, deleteSource, overwrite, conf);
// Check if dest is directory
try {
FileStatus sdst = dstFS.getFileStatus(dst);
if (!sdst.isDirectory())
throw new IOException("copying multiple files, but last argument `" +
dst + "' is not a directory");
} catch (FileNotFoundException e) {
throw new IOException(
"`" + dst + "': specified destination directory " +
"does not exist", e);
}
for (Path src : srcs) {
try {
if (!copy(srcFS, src, dstFS, dst, deleteSource, overwrite, conf))
returnVal = false;
} catch (IOException e) {
gotException = true;
exceptions.append(e.getMessage())
.append("\n");
}
}
if (gotException) {
throw new IOException(exceptions.toString());
}
return returnVal;
}
/** Copy files between FileSystems. */
public static boolean copy(FileSystem srcFS, Path src,
FileSystem dstFS, Path dst,
boolean deleteSource,
boolean overwrite,
Configuration conf) throws IOException {
FileStatus fileStatus = srcFS.getFileStatus(src);
return copy(srcFS, fileStatus, dstFS, dst, deleteSource, overwrite, conf);
}
/** Copy files between FileSystems. */
public static boolean copy(FileSystem srcFS, FileStatus srcStatus,
FileSystem dstFS, Path dst,
boolean deleteSource,
boolean overwrite,
Configuration conf) throws IOException {
Path src = srcStatus.getPath();
dst = checkDest(src.getName(), dstFS, dst, overwrite);
if (srcStatus.isDirectory()) {
checkDependencies(srcFS, src, dstFS, dst);
if (!dstFS.mkdirs(dst)) {
return false;
}
FileStatus contents[] = srcFS.listStatus(src);
for (int i = 0; i < contents.length; i++) {
copy(srcFS, contents[i], dstFS,
new Path(dst, contents[i].getPath().getName()),
deleteSource, overwrite, conf);
}
} else {
InputStream in=null;
OutputStream out = null;
try {
in = srcFS.open(src);
out = dstFS.create(dst, overwrite);
IOUtils.copyBytes(in, out, conf, true);
} catch (IOException e) {
IOUtils.closeStream(out);
IOUtils.closeStream(in);
throw e;
}
}
if (deleteSource) {
return srcFS.delete(src, true);
} else {
return true;
}
}
/** Copy local files to a FileSystem. */
public static boolean copy(File src,
FileSystem dstFS, Path dst,
boolean deleteSource,
Configuration conf) throws IOException {
dst = checkDest(src.getName(), dstFS, dst, false);
if (src.isDirectory()) {
if (!dstFS.mkdirs(dst)) {
return false;
}
File contents[] = listFiles(src);
for (int i = 0; i < contents.length; i++) {
copy(contents[i], dstFS, new Path(dst, contents[i].getName()),
deleteSource, conf);
}
} else if (src.isFile()) {
InputStream in = null;
OutputStream out =null;
try {
in = Files.newInputStream(src.toPath());
out = dstFS.create(dst);
IOUtils.copyBytes(in, out, conf);
} catch (IOException e) {
IOUtils.closeStream( out );
IOUtils.closeStream( in );
throw e;
}
} else if (!src.canRead()) {
throw new IOException(src.toString() +
": Permission denied");
} else {
throw new IOException(src.toString() +
": No such file or directory");
}
if (deleteSource) {
return FileUtil.fullyDelete(src);
} else {
return true;
}
}
/** Copy FileSystem files to local files. */
public static boolean copy(FileSystem srcFS, Path src,
File dst, boolean deleteSource,
Configuration conf) throws IOException {
FileStatus filestatus = srcFS.getFileStatus(src);
return copy(srcFS, filestatus, dst, deleteSource, conf);
}
/** Copy FileSystem files to local files. */
private static boolean copy(FileSystem srcFS, FileStatus srcStatus,
File dst, boolean deleteSource,
Configuration conf) throws IOException {
Path src = srcStatus.getPath();
if (srcStatus.isDirectory()) {
if (!dst.mkdirs()) {
return false;
}
FileStatus contents[] = srcFS.listStatus(src);
for (int i = 0; i < contents.length; i++) {
copy(srcFS, contents[i],
new File(dst, contents[i].getPath().getName()),
deleteSource, conf);
}
} else {
InputStream in = srcFS.open(src);
IOUtils.copyBytes(in, Files.newOutputStream(dst.toPath()), conf);
}
if (deleteSource) {
return srcFS.delete(src, true);
} else {
return true;
}
}
private static Path checkDest(String srcName, FileSystem dstFS, Path dst,
boolean overwrite) throws IOException {
FileStatus sdst;
try {
sdst = dstFS.getFileStatus(dst);
} catch (FileNotFoundException e) {
sdst = null;
}
if (null != sdst) {
if (sdst.isDirectory()) {
if (null == srcName) {
throw new PathIsDirectoryException(dst.toString());
}
return checkDest(null, dstFS, new Path(dst, srcName), overwrite);
} else if (!overwrite) {
throw new PathExistsException(dst.toString(),
"Target " + dst + " already exists");
}
}
return dst;
}
/**
* Convert a os-native filename to a path that works for the shell.
* @param filename The filename to convert
* @return The unix pathname
* @throws IOException on windows, there can be problems with the subprocess
*/
public static String makeShellPath(String filename) throws IOException {
return filename;
}
/**
* Convert a os-native filename to a path that works for the shell.
* @param file The filename to convert
* @return The unix pathname
* @throws IOException on windows, there can be problems with the subprocess
*/
public static String makeShellPath(File file) throws IOException {
return makeShellPath(file, false);
}
/**
* Convert a os-native filename to a path that works for the shell
* and avoids script injection attacks.
* @param file The filename to convert
* @return The unix pathname
* @throws IOException on windows, there can be problems with the subprocess
*/
public static String makeSecureShellPath(File file) throws IOException {
if (Shell.WINDOWS) {
// Currently it is never called, but it might be helpful in the future.
throw new UnsupportedOperationException("Not implemented for Windows");
} else {
return makeShellPath(file, false).replace("'", "'\\''");
}
}
/**
* Convert a os-native filename to a path that works for the shell.
* @param file The filename to convert
* @param makeCanonicalPath
* Whether to make canonical path for the file passed
* @return The unix pathname
* @throws IOException on windows, there can be problems with the subprocess
*/
public static String makeShellPath(File file, boolean makeCanonicalPath)
throws IOException {
if (makeCanonicalPath) {
return makeShellPath(file.getCanonicalPath());
} else {
return makeShellPath(file.toString());
}
}
/**
* Takes an input dir and returns the du on that local directory. Very basic
* implementation.
*
* @param dir
* The input dir to get the disk space of this local dir
* @return The total disk space of the input local directory
*/
public static long getDU(File dir) {
long size = 0;
if (!dir.exists())
return 0;
if (!dir.isDirectory()) {
return dir.length();
} else {
File[] allFiles = dir.listFiles();
if (allFiles != null) {
for (File f : allFiles) {
if (!org.apache.commons.io.FileUtils.isSymlink(f)) {
size += getDU(f);
}
}
}
return size;
}
}
/**
* Given a stream input it will unzip the it in the unzip directory.
* passed as the second parameter
* @param inputStream The zip file as input
* @param toDir The unzip directory where to unzip the zip file.
* @throws IOException an exception occurred
*/
public static void unZip(InputStream inputStream, File toDir)
throws IOException {
try (ZipInputStream zip = new ZipInputStream(inputStream)) {
int numOfFailedLastModifiedSet = 0;
String targetDirPath = toDir.getCanonicalPath() + File.separator;
for(ZipEntry entry = zip.getNextEntry();
entry != null;
entry = zip.getNextEntry()) {
if (!entry.isDirectory()) {
File file = new File(toDir, entry.getName());
if (!file.getCanonicalPath().startsWith(targetDirPath)) {
throw new IOException("expanding " + entry.getName()
+ " would create file outside of " + toDir);
}
File parent = file.getParentFile();
if (!parent.mkdirs() &&
!parent.isDirectory()) {
throw new IOException("Mkdirs failed to create " +
parent.getAbsolutePath());
}
try (OutputStream out = Files.newOutputStream(file.toPath())) {
IOUtils.copyBytes(zip, out, BUFFER_SIZE);
}
if (!file.setLastModified(entry.getTime())) {
numOfFailedLastModifiedSet++;
}
}
}
if (numOfFailedLastModifiedSet > 0) {
LOG.warn("Could not set last modfied time for {} file(s)",
numOfFailedLastModifiedSet);
}
}
}
/**
* Given a File input it will unzip it in the unzip directory.
* passed as the second parameter
* @param inFile The zip file as input
* @param unzipDir The unzip directory where to unzip the zip file.
* @throws IOException An I/O exception has occurred
*/
public static void unZip(File inFile, File unzipDir) throws IOException {
Enumeration entries;
ZipFile zipFile = new ZipFile(inFile);
try {
entries = zipFile.entries();
String targetDirPath = unzipDir.getCanonicalPath() + File.separator;
while (entries.hasMoreElements()) {
ZipEntry entry = entries.nextElement();
if (!entry.isDirectory()) {
InputStream in = zipFile.getInputStream(entry);
try {
File file = new File(unzipDir, entry.getName());
if (!file.getCanonicalPath().startsWith(targetDirPath)) {
throw new IOException("expanding " + entry.getName()
+ " would create file outside of " + unzipDir);
}
if (!file.getParentFile().mkdirs()) {
if (!file.getParentFile().isDirectory()) {
throw new IOException("Mkdirs failed to create " +
file.getParentFile().toString());
}
}
OutputStream out = Files.newOutputStream(file.toPath());
try {
byte[] buffer = new byte[8192];
int i;
while ((i = in.read(buffer)) != -1) {
out.write(buffer, 0, i);
}
} finally {
out.close();
}
} finally {
in.close();
}
}
}
} finally {
zipFile.close();
}
}
/**
* Run a command and send the contents of an input stream to it.
* @param inputStream Input stream to forward to the shell command
* @param command shell command to run
* @throws IOException read or write failed
* @throws InterruptedException command interrupted
* @throws ExecutionException task submit failed
*/
private static void runCommandOnStream(
InputStream inputStream, String command)
throws IOException, InterruptedException, ExecutionException {
ExecutorService executor = null;
ProcessBuilder builder = new ProcessBuilder();
builder.command(
Shell.WINDOWS ? "cmd" : "bash",
Shell.WINDOWS ? "/c" : "-c",
command);
Process process = builder.start();
int exitCode;
try {
// Consume stdout and stderr, to avoid blocking the command
executor = Executors.newFixedThreadPool(2);
Future output = executor.submit(() -> {
try {
// Read until the output stream receives an EOF and closed.
if (LOG.isDebugEnabled()) {
// Log directly to avoid out of memory errors
try (BufferedReader reader =
new BufferedReader(
new InputStreamReader(process.getInputStream(),
Charset.forName("UTF-8")))) {
String line;
while((line = reader.readLine()) != null) {
LOG.debug(line);
}
}
} else {
org.apache.commons.io.IOUtils.copy(
process.getInputStream(),
new IOUtils.NullOutputStream());
}
} catch (IOException e) {
LOG.debug(e.getMessage());
}
});
Future error = executor.submit(() -> {
try {
// Read until the error stream receives an EOF and closed.
if (LOG.isDebugEnabled()) {
// Log directly to avoid out of memory errors
try (BufferedReader reader =
new BufferedReader(
new InputStreamReader(process.getErrorStream(),
Charset.forName("UTF-8")))) {
String line;
while((line = reader.readLine()) != null) {
LOG.debug(line);
}
}
} else {
org.apache.commons.io.IOUtils.copy(
process.getErrorStream(),
new IOUtils.NullOutputStream());
}
} catch (IOException e) {
LOG.debug(e.getMessage());
}
});
// Pass the input stream to the command to process
try {
org.apache.commons.io.IOUtils.copy(
inputStream, process.getOutputStream());
} finally {
process.getOutputStream().close();
}
// Wait for both stdout and stderr futures to finish
error.get();
output.get();
} finally {
// Clean up the threads
if (executor != null) {
executor.shutdown();
}
// Wait to avoid leaking the child process
exitCode = process.waitFor();
}
if (exitCode != 0) {
throw new IOException(
String.format(
"Error executing command. %s " +
"Process exited with exit code %d.",
command, exitCode));
}
}
/**
* Given a Tar File as input it will untar the file in a the untar directory
* passed as the second parameter
*
* This utility will untar ".tar" files and ".tar.gz","tgz" files.
*
* @param inputStream The tar file as input.
* @param untarDir The untar directory where to untar the tar file.
* @param gzipped The input stream is gzipped
* TODO Use magic number and PusbackInputStream to identify
* @throws IOException an exception occurred
* @throws InterruptedException command interrupted
* @throws ExecutionException task submit failed
*/
public static void unTar(InputStream inputStream, File untarDir,
boolean gzipped)
throws IOException, InterruptedException, ExecutionException {
if (!untarDir.mkdirs()) {
if (!untarDir.isDirectory()) {
throw new IOException("Mkdirs failed to create " + untarDir);
}
}
if(Shell.WINDOWS) {
// Tar is not native to Windows. Use simple Java based implementation for
// tests and simple tar archives
unTarUsingJava(inputStream, untarDir, gzipped);
} else {
// spawn tar utility to untar archive for full fledged unix behavior such
// as resolving symlinks in tar archives
unTarUsingTar(inputStream, untarDir, gzipped);
}
}
/**
* Given a Tar File as input it will untar the file in a the untar directory
* passed as the second parameter
*
* This utility will untar ".tar" files and ".tar.gz","tgz" files.
*
* @param inFile The tar file as input.
* @param untarDir The untar directory where to untar the tar file.
* @throws IOException
*/
public static void unTar(File inFile, File untarDir) throws IOException {
if (!untarDir.mkdirs()) {
if (!untarDir.isDirectory()) {
throw new IOException("Mkdirs failed to create " + untarDir);
}
}
boolean gzipped = inFile.toString().endsWith("gz");
if(Shell.WINDOWS) {
// Tar is not native to Windows. Use simple Java based implementation for
// tests and simple tar archives
unTarUsingJava(inFile, untarDir, gzipped);
}
else {
// spawn tar utility to untar archive for full fledged unix behavior such
// as resolving symlinks in tar archives
unTarUsingTar(inFile, untarDir, gzipped);
}
}
private static void unTarUsingTar(InputStream inputStream, File untarDir,
boolean gzipped)
throws IOException, InterruptedException, ExecutionException {
StringBuilder untarCommand = new StringBuilder();
if (gzipped) {
untarCommand.append("gzip -dc | (");
}
untarCommand.append("cd '")
.append(FileUtil.makeSecureShellPath(untarDir))
.append("' && ")
.append("tar -x ");
if (gzipped) {
untarCommand.append(")");
}
runCommandOnStream(inputStream, untarCommand.toString());
}
private static void unTarUsingTar(File inFile, File untarDir,
boolean gzipped) throws IOException {
StringBuffer untarCommand = new StringBuffer();
if (gzipped) {
untarCommand.append(" gzip -dc '")
.append(FileUtil.makeSecureShellPath(inFile))
.append("' | (");
}
untarCommand.append("cd '")
.append(FileUtil.makeSecureShellPath(untarDir))
.append("' && ")
.append("tar -xf ");
if (gzipped) {
untarCommand.append(" -)");
} else {
untarCommand.append(FileUtil.makeSecureShellPath(inFile));
}
String[] shellCmd = { "bash", "-c", untarCommand.toString() };
ShellCommandExecutor shexec = new ShellCommandExecutor(shellCmd);
shexec.execute();
int exitcode = shexec.getExitCode();
if (exitcode != 0) {
throw new IOException("Error untarring file " + inFile +
". Tar process exited with exit code " + exitcode);
}
}
static void unTarUsingJava(File inFile, File untarDir,
boolean gzipped) throws IOException {
InputStream inputStream = null;
TarArchiveInputStream tis = null;
try {
if (gzipped) {
inputStream =
new GZIPInputStream(Files.newInputStream(inFile.toPath()));
} else {
inputStream = Files.newInputStream(inFile.toPath());
}
inputStream = new BufferedInputStream(inputStream);
tis = new TarArchiveInputStream(inputStream);
for (TarArchiveEntry entry = tis.getNextTarEntry(); entry != null;) {
unpackEntries(tis, entry, untarDir);
entry = tis.getNextTarEntry();
}
} finally {
IOUtils.cleanupWithLogger(LOG, tis, inputStream);
}
}
private static void unTarUsingJava(InputStream inputStream, File untarDir,
boolean gzipped) throws IOException {
TarArchiveInputStream tis = null;
try {
if (gzipped) {
inputStream = new GZIPInputStream(inputStream);
}
inputStream = new BufferedInputStream(inputStream);
tis = new TarArchiveInputStream(inputStream);
for (TarArchiveEntry entry = tis.getNextTarEntry(); entry != null;) {
unpackEntries(tis, entry, untarDir);
entry = tis.getNextTarEntry();
}
} finally {
IOUtils.cleanupWithLogger(LOG, tis, inputStream);
}
}
private static void unpackEntries(TarArchiveInputStream tis,
TarArchiveEntry entry, File outputDir) throws IOException {
String targetDirPath = outputDir.getCanonicalPath() + File.separator;
File outputFile = new File(outputDir, entry.getName());
if (!outputFile.getCanonicalPath().startsWith(targetDirPath)) {
throw new IOException("expanding " + entry.getName()
+ " would create entry outside of " + outputDir);
}
if (entry.isDirectory()) {
File subDir = new File(outputDir, entry.getName());
if (!subDir.mkdirs() && !subDir.isDirectory()) {
throw new IOException("Mkdirs failed to create tar internal dir "
+ outputDir);
}
for (TarArchiveEntry e : entry.getDirectoryEntries()) {
unpackEntries(tis, e, subDir);
}
return;
}
if (entry.isSymbolicLink()) {
// Create symbolic link relative to tar parent dir
Files.createSymbolicLink(FileSystems.getDefault()
.getPath(outputDir.getPath(), entry.getName()),
FileSystems.getDefault().getPath(entry.getLinkName()));
return;
}
if (!outputFile.getParentFile().exists()) {
if (!outputFile.getParentFile().mkdirs()) {
throw new IOException("Mkdirs failed to create tar internal dir "
+ outputDir);
}
}
if (entry.isLink()) {
File src = new File(outputDir, entry.getLinkName());
HardLink.createHardLink(src, outputFile);
return;
}
org.apache.commons.io.FileUtils.copyToFile(tis, outputFile);
}
/**
* Class for creating hardlinks.
* Supports Unix, WindXP.
* @deprecated Use {@link org.apache.hadoop.fs.HardLink}
*/
@Deprecated
public static class HardLink extends org.apache.hadoop.fs.HardLink {
// This is a stub to assist with coordinated change between
// COMMON and HDFS projects. It will be removed after the
// corresponding change is committed to HDFS.
}
/**
* Create a soft link between a src and destination
* only on a local disk. HDFS does not support this.
* On Windows, when symlink creation fails due to security
* setting, we will log a warning. The return code in this
* case is 2.
*
* @param target the target for symlink
* @param linkname the symlink
* @return 0 on success
*/
public static int symLink(String target, String linkname) throws IOException{
if (target == null || linkname == null) {
LOG.warn("Can not create a symLink with a target = " + target
+ " and link =" + linkname);
return 1;
}
// Run the input paths through Java's File so that they are converted to the
// native OS form
File targetFile = new File(
Path.getPathWithoutSchemeAndAuthority(new Path(target)).toString());
File linkFile = new File(
Path.getPathWithoutSchemeAndAuthority(new Path(linkname)).toString());
String[] cmd = Shell.getSymlinkCommand(
targetFile.toString(),
linkFile.toString());
ShellCommandExecutor shExec;
try {
if (Shell.WINDOWS &&
linkFile.getParentFile() != null &&
!new Path(target).isAbsolute()) {
// Relative links on Windows must be resolvable at the time of
// creation. To ensure this we run the shell command in the directory
// of the link.
//
shExec = new ShellCommandExecutor(cmd, linkFile.getParentFile());
} else {
shExec = new ShellCommandExecutor(cmd);
}
shExec.execute();
} catch (Shell.ExitCodeException ec) {
int returnVal = ec.getExitCode();
if (Shell.WINDOWS && returnVal == SYMLINK_NO_PRIVILEGE) {
LOG.warn("Fail to create symbolic links on Windows. "
+ "The default security settings in Windows disallow non-elevated "
+ "administrators and all non-administrators from creating symbolic links. "
+ "This behavior can be changed in the Local Security Policy management console");
} else if (returnVal != 0) {
LOG.warn("Command '" + StringUtils.join(" ", cmd) + "' failed "
+ returnVal + " with: " + ec.getMessage());
}
return returnVal;
} catch (IOException e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Error while create symlink " + linkname + " to " + target
+ "." + " Exception: " + StringUtils.stringifyException(e));
}
throw e;
}
return shExec.getExitCode();
}
/**
* Change the permissions on a filename.
* @param filename the name of the file to change
* @param perm the permission string
* @return the exit code from the command
* @throws IOException
* @throws InterruptedException
*/
public static int chmod(String filename, String perm
) throws IOException, InterruptedException {
return chmod(filename, perm, false);
}
/**
* Change the permissions on a file / directory, recursively, if
* needed.
* @param filename name of the file whose permissions are to change
* @param perm permission string
* @param recursive true, if permissions should be changed recursively
* @return the exit code from the command.
* @throws IOException
*/
public static int chmod(String filename, String perm, boolean recursive)
throws IOException {
String [] cmd = Shell.getSetPermissionCommand(perm, recursive);
String[] args = new String[cmd.length + 1];
System.arraycopy(cmd, 0, args, 0, cmd.length);
args[cmd.length] = new File(filename).getPath();
ShellCommandExecutor shExec = new ShellCommandExecutor(args);
try {
shExec.execute();
}catch(IOException e) {
if(LOG.isDebugEnabled()) {
LOG.debug("Error while changing permission : " + filename
+" Exception: " + StringUtils.stringifyException(e));
}
}
return shExec.getExitCode();
}
/**
* Set the ownership on a file / directory. User name and group name
* cannot both be null.
* @param file the file to change
* @param username the new user owner name
* @param groupname the new group owner name
* @throws IOException
*/
public static void setOwner(File file, String username,
String groupname) throws IOException {
if (username == null && groupname == null) {
throw new IOException("username == null && groupname == null");
}
String arg = (username == null ? "" : username)
+ (groupname == null ? "" : ":" + groupname);
String [] cmd = Shell.getSetOwnerCommand(arg);
execCommand(file, cmd);
}
/**
* Platform independent implementation for {@link File#setReadable(boolean)}
* File#setReadable does not work as expected on Windows.
* @param f input file
* @param readable
* @return true on success, false otherwise
*/
public static boolean setReadable(File f, boolean readable) {
if (Shell.WINDOWS) {
try {
String permission = readable ? "u+r" : "u-r";
FileUtil.chmod(f.getCanonicalPath(), permission, false);
return true;
} catch (IOException ex) {
return false;
}
} else {
return f.setReadable(readable);
}
}
/**
* Platform independent implementation for {@link File#setWritable(boolean)}
* File#setWritable does not work as expected on Windows.
* @param f input file
* @param writable
* @return true on success, false otherwise
*/
public static boolean setWritable(File f, boolean writable) {
if (Shell.WINDOWS) {
try {
String permission = writable ? "u+w" : "u-w";
FileUtil.chmod(f.getCanonicalPath(), permission, false);
return true;
} catch (IOException ex) {
return false;
}
} else {
return f.setWritable(writable);
}
}
/**
* Platform independent implementation for {@link File#setExecutable(boolean)}
* File#setExecutable does not work as expected on Windows.
* Note: revoking execute permission on folders does not have the same
* behavior on Windows as on Unix platforms. Creating, deleting or renaming
* a file within that folder will still succeed on Windows.
* @param f input file
* @param executable
* @return true on success, false otherwise
*/
public static boolean setExecutable(File f, boolean executable) {
if (Shell.WINDOWS) {
try {
String permission = executable ? "u+x" : "u-x";
FileUtil.chmod(f.getCanonicalPath(), permission, false);
return true;
} catch (IOException ex) {
return false;
}
} else {
return f.setExecutable(executable);
}
}
/**
* Platform independent implementation for {@link File#canRead()}
* @param f input file
* @return On Unix, same as {@link File#canRead()}
* On Windows, true if process has read access on the path
*/
public static boolean canRead(File f) {
if (Shell.WINDOWS) {
try {
return NativeIO.Windows.access(f.getCanonicalPath(),
NativeIO.Windows.AccessRight.ACCESS_READ);
} catch (IOException e) {
return false;
}
} else {
return f.canRead();
}
}
/**
* Platform independent implementation for {@link File#canWrite()}
* @param f input file
* @return On Unix, same as {@link File#canWrite()}
* On Windows, true if process has write access on the path
*/
public static boolean canWrite(File f) {
if (Shell.WINDOWS) {
try {
return NativeIO.Windows.access(f.getCanonicalPath(),
NativeIO.Windows.AccessRight.ACCESS_WRITE);
} catch (IOException e) {
return false;
}
} else {
return f.canWrite();
}
}
/**
* Platform independent implementation for {@link File#canExecute()}
* @param f input file
* @return On Unix, same as {@link File#canExecute()}
* On Windows, true if process has execute access on the path
*/
public static boolean canExecute(File f) {
if (Shell.WINDOWS) {
try {
return NativeIO.Windows.access(f.getCanonicalPath(),
NativeIO.Windows.AccessRight.ACCESS_EXECUTE);
} catch (IOException e) {
return false;
}
} else {
return f.canExecute();
}
}
/**
* Set permissions to the required value. Uses the java primitives instead
* of forking if group == other.
* @param f the file to change
* @param permission the new permissions
* @throws IOException
*/
public static void setPermission(File f, FsPermission permission
) throws IOException {
FsAction user = permission.getUserAction();
FsAction group = permission.getGroupAction();
FsAction other = permission.getOtherAction();
// use the native/fork if the group/other permissions are different
// or if the native is available or on Windows
if (group != other || NativeIO.isAvailable() || Shell.WINDOWS) {
execSetPermission(f, permission);
return;
}
boolean rv = true;
// read perms
rv = f.setReadable(group.implies(FsAction.READ), false);
checkReturnValue(rv, f, permission);
if (group.implies(FsAction.READ) != user.implies(FsAction.READ)) {
rv = f.setReadable(user.implies(FsAction.READ), true);
checkReturnValue(rv, f, permission);
}
// write perms
rv = f.setWritable(group.implies(FsAction.WRITE), false);
checkReturnValue(rv, f, permission);
if (group.implies(FsAction.WRITE) != user.implies(FsAction.WRITE)) {
rv = f.setWritable(user.implies(FsAction.WRITE), true);
checkReturnValue(rv, f, permission);
}
// exec perms
rv = f.setExecutable(group.implies(FsAction.EXECUTE), false);
checkReturnValue(rv, f, permission);
if (group.implies(FsAction.EXECUTE) != user.implies(FsAction.EXECUTE)) {
rv = f.setExecutable(user.implies(FsAction.EXECUTE), true);
checkReturnValue(rv, f, permission);
}
}
private static void checkReturnValue(boolean rv, File p,
FsPermission permission
) throws IOException {
if (!rv) {
throw new IOException("Failed to set permissions of path: " + p +
" to " +
String.format("%04o", permission.toShort()));
}
}
private static void execSetPermission(File f,
FsPermission permission
) throws IOException {
if (NativeIO.isAvailable()) {
NativeIO.POSIX.chmod(f.getCanonicalPath(), permission.toShort());
} else {
execCommand(f, Shell.getSetPermissionCommand(
String.format("%04o", permission.toShort()), false));
}
}
static String execCommand(File f, String... cmd) throws IOException {
String[] args = new String[cmd.length + 1];
System.arraycopy(cmd, 0, args, 0, cmd.length);
args[cmd.length] = f.getCanonicalPath();
String output = Shell.execCommand(args);
return output;
}
/**
* Create a tmp file for a base file.
* @param basefile the base file of the tmp
* @param prefix file name prefix of tmp
* @param isDeleteOnExit if true, the tmp will be deleted when the VM exits
* @return a newly created tmp file
* @exception IOException If a tmp file cannot created
* @see java.io.File#createTempFile(String, String, File)
* @see java.io.File#deleteOnExit()
*/
public static final File createLocalTempFile(final File basefile,
final String prefix,
final boolean isDeleteOnExit)
throws IOException {
File tmp = File.createTempFile(prefix + basefile.getName(),
"", basefile.getParentFile());
if (isDeleteOnExit) {
tmp.deleteOnExit();
}
return tmp;
}
/**
* Move the src file to the name specified by target.
* @param src the source file
* @param target the target file
* @exception IOException If this operation fails
*/
public static void replaceFile(File src, File target) throws IOException {
/* renameTo() has two limitations on Windows platform.
* src.renameTo(target) fails if
* 1) If target already exists OR
* 2) If target is already open for reading/writing.
*/
if (!src.renameTo(target)) {
int retries = 5;
while (target.exists() && !target.delete() && retries-- >= 0) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
throw new IOException("replaceFile interrupted.");
}
}
if (!src.renameTo(target)) {
throw new IOException("Unable to rename " + src +
" to " + target);
}
}
}
/**
* A wrapper for {@link File#listFiles()}. This java.io API returns null
* when a dir is not a directory or for any I/O error. Instead of having
* null check everywhere File#listFiles() is used, we will add utility API
* to get around this problem. For the majority of cases where we prefer
* an IOException to be thrown.
* @param dir directory for which listing should be performed
* @return list of files or empty list
* @exception IOException for invalid directory or for a bad disk.
*/
public static File[] listFiles(File dir) throws IOException {
File[] files = dir.listFiles();
if(files == null) {
throw new IOException("Invalid directory or I/O error occurred for dir: "
+ dir.toString());
}
return files;
}
/**
* A wrapper for {@link File#list()}. This java.io API returns null
* when a dir is not a directory or for any I/O error. Instead of having
* null check everywhere File#list() is used, we will add utility API
* to get around this problem. For the majority of cases where we prefer
* an IOException to be thrown.
* @param dir directory for which listing should be performed
* @return list of file names or empty string list
* @exception AccessDeniedException for unreadable directory
* @exception IOException for invalid directory or for bad disk
*/
public static String[] list(File dir) throws IOException {
if (!canRead(dir)) {
throw new AccessDeniedException(dir.toString(), null,
FSExceptionMessages.PERMISSION_DENIED);
}
String[] fileNames = dir.list();
if(fileNames == null) {
throw new IOException("Invalid directory or I/O error occurred for dir: "
+ dir.toString());
}
return fileNames;
}
public static String[] createJarWithClassPath(String inputClassPath, Path pwd,
Map callerEnv) throws IOException {
return createJarWithClassPath(inputClassPath, pwd, pwd, callerEnv);
}
/**
* Create a jar file at the given path, containing a manifest with a classpath
* that references all specified entries.
*
* Some platforms may have an upper limit on command line length. For example,
* the maximum command line length on Windows is 8191 characters, but the
* length of the classpath may exceed this. To work around this limitation,
* use this method to create a small intermediate jar with a manifest that
* contains the full classpath. It returns the absolute path to the new jar,
* which the caller may set as the classpath for a new process.
*
* Environment variable evaluation is not supported within a jar manifest, so
* this method expands environment variables before inserting classpath entries
* to the manifest. The method parses environment variables according to
* platform-specific syntax (%VAR% on Windows, or $VAR otherwise). On Windows,
* environment variables are case-insensitive. For example, %VAR% and %var%
* evaluate to the same value.
*
* Specifying the classpath in a jar manifest does not support wildcards, so
* this method expands wildcards internally. Any classpath entry that ends
* with * is translated to all files at that path with extension .jar or .JAR.
*
* @param inputClassPath String input classpath to bundle into the jar manifest
* @param pwd Path to working directory to save jar
* @param targetDir path to where the jar execution will have its working dir
* @param callerEnv Map {@literal <}String, String{@literal >} caller's
* environment variables to use for expansion
* @return String[] with absolute path to new jar in position 0 and
* unexpanded wild card entry path in position 1
* @throws IOException if there is an I/O error while writing the jar file
*/
public static String[] createJarWithClassPath(String inputClassPath, Path pwd,
Path targetDir,
Map callerEnv) throws IOException {
// Replace environment variables, case-insensitive on Windows
@SuppressWarnings("unchecked")
Map env = Shell.WINDOWS ? new CaseInsensitiveMap(callerEnv) :
callerEnv;
String[] classPathEntries = inputClassPath.split(File.pathSeparator);
for (int i = 0; i < classPathEntries.length; ++i) {
classPathEntries[i] = StringUtils.replaceTokens(classPathEntries[i],
StringUtils.ENV_VAR_PATTERN, env);
}
File workingDir = new File(pwd.toString());
if (!workingDir.mkdirs()) {
// If mkdirs returns false because the working directory already exists,
// then this is acceptable. If it returns false due to some other I/O
// error, then this method will fail later with an IOException while saving
// the jar.
LOG.debug("mkdirs false for " + workingDir + ", execution will continue");
}
StringBuilder unexpandedWildcardClasspath = new StringBuilder();
// Append all entries
List classPathEntryList = new ArrayList(
classPathEntries.length);
for (String classPathEntry: classPathEntries) {
if (classPathEntry.length() == 0) {
continue;
}
if (classPathEntry.endsWith("*")) {
// Append all jars that match the wildcard
List jars = getJarsInDirectory(classPathEntry);
if (!jars.isEmpty()) {
for (Path jar: jars) {
classPathEntryList.add(jar.toUri().toURL().toExternalForm());
}
} else {
unexpandedWildcardClasspath.append(File.pathSeparator)
.append(classPathEntry);
}
} else {
// Append just this entry
File fileCpEntry = null;
if(!new Path(classPathEntry).isAbsolute()) {
fileCpEntry = new File(targetDir.toString(), classPathEntry);
}
else {
fileCpEntry = new File(classPathEntry);
}
String classPathEntryUrl = fileCpEntry.toURI().toURL()
.toExternalForm();
// File.toURI only appends trailing '/' if it can determine that it is a
// directory that already exists. (See JavaDocs.) If this entry had a
// trailing '/' specified by the caller, then guarantee that the
// classpath entry in the manifest has a trailing '/', and thus refers to
// a directory instead of a file. This can happen if the caller is
// creating a classpath jar referencing a directory that hasn't been
// created yet, but will definitely be created before running.
if (classPathEntry.endsWith(Path.SEPARATOR) &&
!classPathEntryUrl.endsWith(Path.SEPARATOR)) {
classPathEntryUrl = classPathEntryUrl + Path.SEPARATOR;
}
classPathEntryList.add(classPathEntryUrl);
}
}
String jarClassPath = StringUtils.join(" ", classPathEntryList);
// Create the manifest
Manifest jarManifest = new Manifest();
jarManifest.getMainAttributes().putValue(
Attributes.Name.MANIFEST_VERSION.toString(), "1.0");
jarManifest.getMainAttributes().putValue(
Attributes.Name.CLASS_PATH.toString(), jarClassPath);
// Write the manifest to output JAR file
File classPathJar = File.createTempFile("classpath-", ".jar", workingDir);
try (OutputStream fos = Files.newOutputStream(classPathJar.toPath());
BufferedOutputStream bos = new BufferedOutputStream(fos)) {
JarOutputStream jos = new JarOutputStream(bos, jarManifest);
jos.close();
}
String[] jarCp = {classPathJar.getCanonicalPath(),
unexpandedWildcardClasspath.toString()};
return jarCp;
}
/**
* Returns all jars that are in the directory. It is useful in expanding a
* wildcard path to return all jars from the directory to use in a classpath.
* It operates only on local paths.
*
* @param path the path to the directory. The path may include the wildcard.
* @return the list of jars as URLs, or an empty list if there are no jars, or
* the directory does not exist locally
*/
public static List getJarsInDirectory(String path) {
return getJarsInDirectory(path, true);
}
/**
* Returns all jars that are in the directory. It is useful in expanding a
* wildcard path to return all jars from the directory to use in a classpath.
*
* @param path the path to the directory. The path may include the wildcard.
* @return the list of jars as URLs, or an empty list if there are no jars, or
* the directory does not exist
*/
public static List getJarsInDirectory(String path, boolean useLocal) {
List paths = new ArrayList<>();
try {
// add the wildcard if it is not provided
if (!path.endsWith("*")) {
path += File.separator + "*";
}
Path globPath = new Path(path).suffix("{.jar,.JAR}");
FileContext context = useLocal ?
FileContext.getLocalFSFileContext() :
FileContext.getFileContext(globPath.toUri());
FileStatus[] files = context.util().globStatus(globPath);
if (files != null) {
for (FileStatus file: files) {
paths.add(file.getPath());
}
}
} catch (IOException ignore) {} // return the empty list
return paths;
}
public static boolean compareFs(FileSystem srcFs, FileSystem destFs) {
if (srcFs==null || destFs==null) {
return false;
}
URI srcUri = srcFs.getUri();
URI dstUri = destFs.getUri();
if (srcUri.getScheme()==null) {
return false;
}
if (!srcUri.getScheme().equals(dstUri.getScheme())) {
return false;
}
String srcHost = srcUri.getHost();
String dstHost = dstUri.getHost();
if ((srcHost!=null) && (dstHost!=null)) {
if (srcHost.equals(dstHost)) {
return srcUri.getPort()==dstUri.getPort();
}
try {
srcHost = InetAddress.getByName(srcHost).getCanonicalHostName();
dstHost = InetAddress.getByName(dstHost).getCanonicalHostName();
} catch (UnknownHostException ue) {
if (LOG.isDebugEnabled()) {
LOG.debug("Could not compare file-systems. Unknown host: ", ue);
}
return false;
}
if (!srcHost.equals(dstHost)) {
return false;
}
} else if (srcHost==null && dstHost!=null) {
return false;
} else if (srcHost!=null) {
return false;
}
// check for ports
return srcUri.getPort()==dstUri.getPort();
}
/**
* Writes bytes to a file. This utility method opens the file for writing,
* creating the file if it does not exist, or overwrites an existing file. All
* bytes in the byte array are written to the file.
*
* @param fs the file system with which to create the file
* @param path the path to the file
* @param bytes the byte array with the bytes to write
*
* @return the file system
*
* @throws NullPointerException if any of the arguments are {@code null}
* @throws IOException if an I/O error occurs creating or writing to the file
*/
public static FileSystem write(final FileSystem fs, final Path path,
final byte[] bytes) throws IOException {
Objects.requireNonNull(path);
Objects.requireNonNull(bytes);
try (FSDataOutputStream out = fs.createFile(path).overwrite(true).build()) {
out.write(bytes);
}
return fs;
}
/**
* Writes bytes to a file. This utility method opens the file for writing,
* creating the file if it does not exist, or overwrites an existing file. All
* bytes in the byte array are written to the file.
*
* @param fileContext the file context with which to create the file
* @param path the path to the file
* @param bytes the byte array with the bytes to write
*
* @return the file context
*
* @throws NullPointerException if any of the arguments are {@code null}
* @throws IOException if an I/O error occurs creating or writing to the file
*/
public static FileContext write(final FileContext fileContext,
final Path path, final byte[] bytes) throws IOException {
Objects.requireNonNull(path);
Objects.requireNonNull(bytes);
try (FSDataOutputStream out =
fileContext.create(path).overwrite(true).build()) {
out.write(bytes);
}
return fileContext;
}
/**
* Write lines of text to a file. Each line is a char sequence and is written
* to the file in sequence with each line terminated by the platform's line
* separator, as defined by the system property {@code
* line.separator}. Characters are encoded into bytes using the specified
* charset. This utility method opens the file for writing, creating the file
* if it does not exist, or overwrites an existing file.
*
* @param fs the file system with which to create the file
* @param path the path to the file
* @param lines a Collection to iterate over the char sequences
* @param cs the charset to use for encoding
*
* @return the file system
*
* @throws NullPointerException if any of the arguments are {@code null}
* @throws IOException if an I/O error occurs creating or writing to the file
*/
public static FileSystem write(final FileSystem fs, final Path path,
final Iterable lines, final Charset cs)
throws IOException {
Objects.requireNonNull(path);
Objects.requireNonNull(lines);
Objects.requireNonNull(cs);
CharsetEncoder encoder = cs.newEncoder();
try (FSDataOutputStream out = fs.createFile(path).overwrite(true).build();
BufferedWriter writer =
new BufferedWriter(new OutputStreamWriter(out, encoder))) {
for (CharSequence line : lines) {
writer.append(line);
writer.newLine();
}
}
return fs;
}
/**
* Write lines of text to a file. Each line is a char sequence and is written
* to the file in sequence with each line terminated by the platform's line
* separator, as defined by the system property {@code
* line.separator}. Characters are encoded into bytes using the specified
* charset. This utility method opens the file for writing, creating the file
* if it does not exist, or overwrites an existing file.
*
* @param fileContext the file context with which to create the file
* @param path the path to the file
* @param lines a Collection to iterate over the char sequences
* @param cs the charset to use for encoding
*
* @return the file context
*
* @throws NullPointerException if any of the arguments are {@code null}
* @throws IOException if an I/O error occurs creating or writing to the file
*/
public static FileContext write(final FileContext fileContext,
final Path path, final Iterable lines,
final Charset cs) throws IOException {
Objects.requireNonNull(path);
Objects.requireNonNull(lines);
Objects.requireNonNull(cs);
CharsetEncoder encoder = cs.newEncoder();
try (FSDataOutputStream out = fileContext.create(path).overwrite(true).build();
BufferedWriter writer =
new BufferedWriter(new OutputStreamWriter(out, encoder))) {
for (CharSequence line : lines) {
writer.append(line);
writer.newLine();
}
}
return fileContext;
}
/**
* Write a line of text to a file. Characters are encoded into bytes using the
* specified charset. This utility method opens the file for writing, creating
* the file if it does not exist, or overwrites an existing file.
*
* @param fs the file system with which to create the file
* @param path the path to the file
* @param charseq the char sequence to write to the file
* @param cs the charset to use for encoding
*
* @return the file system
*
* @throws NullPointerException if any of the arguments are {@code null}
* @throws IOException if an I/O error occurs creating or writing to the file
*/
public static FileSystem write(final FileSystem fs, final Path path,
final CharSequence charseq, final Charset cs) throws IOException {
Objects.requireNonNull(path);
Objects.requireNonNull(charseq);
Objects.requireNonNull(cs);
CharsetEncoder encoder = cs.newEncoder();
try (FSDataOutputStream out = fs.createFile(path).overwrite(true).build();
BufferedWriter writer =
new BufferedWriter(new OutputStreamWriter(out, encoder))) {
writer.append(charseq);
}
return fs;
}
/**
* Write a line of text to a file. Characters are encoded into bytes using the
* specified charset. This utility method opens the file for writing, creating
* the file if it does not exist, or overwrites an existing file.
*
* @param FileContext the file context with which to create the file
* @param path the path to the file
* @param charseq the char sequence to write to the file
* @param cs the charset to use for encoding
*
* @return the file context
*
* @throws NullPointerException if any of the arguments are {@code null}
* @throws IOException if an I/O error occurs creating or writing to the file
*/
public static FileContext write(final FileContext fs, final Path path,
final CharSequence charseq, final Charset cs) throws IOException {
Objects.requireNonNull(path);
Objects.requireNonNull(charseq);
Objects.requireNonNull(cs);
CharsetEncoder encoder = cs.newEncoder();
try (FSDataOutputStream out = fs.create(path).overwrite(true).build();
BufferedWriter writer =
new BufferedWriter(new OutputStreamWriter(out, encoder))) {
writer.append(charseq);
}
return fs;
}
/**
* Write a line of text to a file. Characters are encoded into bytes using
* UTF-8. This utility method opens the file for writing, creating the file if
* it does not exist, or overwrites an existing file.
*
* @param fs the files system with which to create the file
* @param path the path to the file
* @param charseq the char sequence to write to the file
*
* @return the file system
*
* @throws NullPointerException if any of the arguments are {@code null}
* @throws IOException if an I/O error occurs creating or writing to the file
*/
public static FileSystem write(final FileSystem fs, final Path path,
final CharSequence charseq) throws IOException {
return write(fs, path, charseq, StandardCharsets.UTF_8);
}
/**
* Write a line of text to a file. Characters are encoded into bytes using
* UTF-8. This utility method opens the file for writing, creating the file if
* it does not exist, or overwrites an existing file.
*
* @param fileContext the files system with which to create the file
* @param path the path to the file
* @param charseq the char sequence to write to the file
*
* @return the file context
*
* @throws NullPointerException if any of the arguments are {@code null}
* @throws IOException if an I/O error occurs creating or writing to the file
*/
public static FileContext write(final FileContext fileContext,
final Path path, final CharSequence charseq) throws IOException {
return write(fileContext, path, charseq, StandardCharsets.UTF_8);
}
}
