/**
* 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.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.zip.GZIPInputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.shell.CommandFormat;
import org.apache.hadoop.fs.shell.Count;
import org.apache.hadoop.io.DataInputBuffer;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.CompressionCodecFactory;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hadoop.util.StringUtils;
/** Provide command line access to a FileSystem. */
public class FsShell extends Configured implements Tool {
protected FileSystem fs;
private Trash trash;
public static final SimpleDateFormat dateForm =
new SimpleDateFormat("yyyy-MM-dd HH:mm");
protected static final SimpleDateFormat modifFmt =
new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
static final int BORDER = 2;
static {
modifFmt.setTimeZone(TimeZone.getTimeZone("UTC"));
}
static final String SETREP_SHORT_USAGE="-setrep [-R] [-w] <rep> <path/file ...>";
static final int SETREP_MAX_PATHS = 1024;
static final String GET_SHORT_USAGE = "-get [-ignoreCrc] [-crc] [-gencrc] <src> <localdst>";
static final String COPYTOLOCAL_SHORT_USAGE = GET_SHORT_USAGE.replace(
"-get", "-copyToLocal");
static final String HEAD_USAGE="-head <file>";
static final String TAIL_USAGE="-tail [-f] <file>";
/**
*/
public FsShell() {
this(null);
}
public FsShell(Configuration conf) {
super(conf);
fs = null;
trash = null;
}
protected FileSystem getFS() throws IOException {
if (this.fs != null) {
return this.fs;
}
synchronized(this) {
if (this.fs == null) {
this.fs = FileSystem.get(getConf());
}
}
return this.fs;
}
protected Trash getTrash() throws IOException{
if (this.trash != null) {
return this.trash;
}
synchronized(this) {
if (this.trash == null) {
this.trash = new Trash(getConf());
}
}
return this.trash;
}
public void init() throws IOException {
getConf().setQuietMode(true);
}
public enum LsOption {
Recursive,
WithBlockSize
};
/**
* Copies from stdin to the indicated file.
*/
private void copyFromStdin(Path dst, FileSystem dstFs) throws IOException {
if (dstFs.isDirectory(dst)) {
throw new IOException("When source is stdin, destination must be a file.");
}
if (dstFs.exists(dst)) {
throw new IOException("Target " + dst.toString() + " already exists.");
}
FSDataOutputStream out = dstFs.create(dst);
try {
IOUtils.copyBytes(System.in, out, getConf(), false);
}
finally {
out.close();
}
}
/**
* Print from src to stdout
*/
private void printToStdout(InputStream in) throws IOException {
try {
IOUtils.copyBytes(in, System.out, getConf(), false);
} finally {
in.close();
}
}
/**
* Print from src to stdout
* And print the checksum to stderr
*/
private void printToStdoutAndCRCToStderr(InputStream in, Path file) throws IOException {
try {
long checksum = IOUtils.copyBytesAndGenerateCRC(in, System.out, getConf(), false);
FileUtil.printChecksumToStderr(checksum, file);
} finally {
in.close();
}
}
/**
* Add local files to the indicated FileSystem name. src is kept.
*/
void copyFromLocal(Path[] srcs, String dstf) throws IOException {
Path dstPath = new Path(dstf);
FileSystem dstFs = dstPath.getFileSystem(getConf());
if (srcs.length == 1 && srcs[0].toString().equals("-"))
copyFromStdin(dstPath, dstFs);
else
dstFs.copyFromLocalFile(false, false, srcs, dstPath);
}
/**
* Add local files to the indicated FileSystem name. src is removed.
*/
void moveFromLocal(Path[] srcs, String dstf) throws IOException {
Path dstPath = new Path(dstf);
FileSystem dstFs = dstPath.getFileSystem(getConf());
dstFs.moveFromLocalFile(srcs, dstPath);
}
/**
* Add a local file to the indicated FileSystem name. src is removed.
*/
void moveFromLocal(Path src, String dstf) throws IOException {
moveFromLocal((new Path[]{src}), dstf);
}
/**
* Obtain the indicated files that match the file pattern <i>srcf</i>
* and copy them to the local name. srcf is kept.
* When copying multiple files, the destination must be a directory.
* Otherwise, IOException is thrown.
* @param argv: arguments
* @param pos: Ignore everything before argv[pos]
* @exception: IOException
* @see org.apache.hadoop.fs.FileSystem.globStatus
*/
void copyToLocal(String[]argv, int pos) throws IOException {
CommandFormat cf = new CommandFormat("copyToLocal", 2,2,"crc","ignoreCrc", "gencrc");
String srcstr = null;
String dststr = null;
try {
List<String> parameters = cf.parse(argv, pos);
srcstr = parameters.get(0);
dststr = parameters.get(1);
}
catch(IllegalArgumentException iae) {
System.err.println("Usage: java FsShell " + GET_SHORT_USAGE);
throw iae;
}
boolean copyCrc = cf.getOpt("crc");
final boolean genCrc = cf.getOpt("gencrc");
final boolean verifyChecksum = !cf.getOpt("ignoreCrc");
if (dststr.equals("-")) {
if (copyCrc) {
System.err.println("-crc option is not valid when destination is stdout.");
}
cat(srcstr, verifyChecksum, genCrc);
} else {
File dst = new File(dststr);
Path srcpath = new Path(srcstr);
FileSystem srcFS = getSrcFileSystem(srcpath, verifyChecksum);
if (copyCrc && !(srcFS instanceof ChecksumFileSystem)) {
System.err.println("-crc option is not valid when source file system " +
"does not have crc files. Automatically turn the option off.");
copyCrc = false;
}
FileStatus[] srcs = srcFS.globStatus(srcpath);
boolean dstIsDir = dst.isDirectory();
if (srcs.length > 1 && !dstIsDir) {
throw new IOException("When copying multiple files, "
+ "destination should be a directory.");
}
for (FileStatus status : srcs) {
Path p = status.getPath();
File f = dstIsDir? new File(dst, p.getName()): dst;
copyToLocal(srcFS, p, f, copyCrc, genCrc);
}
}
}
/**
* Return the {@link FileSystem} specified by src and the conf.
* It the {@link FileSystem} supports checksum, set verifyChecksum.
*/
private FileSystem getSrcFileSystem(Path src, boolean verifyChecksum
) throws IOException {
FileSystem srcFs = src.getFileSystem(getConf());
srcFs.setVerifyChecksum(verifyChecksum);
return srcFs;
}
/**
* The prefix for the tmp file used in copyToLocal.
* It must be at least three characters long, required by
* {@link java.io.File#createTempFile(String, String, File)}.
*/
static final String COPYTOLOCAL_PREFIX = "_copyToLocal_";
/**
* Copy a source file from a given file system to local destination.
* @param srcFS source file system
* @param src source path
* @param dst destination
* @param copyCrc copy CRC files?
* @param generate CRC or not?
* @exception IOException If some IO failed
*/
private void copyToLocal(final FileSystem srcFS, final Path src,
final File dst, final boolean copyCrc,
final boolean genCrc)
throws IOException {
/* Keep the structure similar to ChecksumFileSystem.copyToLocal().
* Ideal these two should just invoke FileUtil.copy() and not repeat
* recursion here. Of course, copy() should support two more options :
* copyCrc and useTmpFile (may be useTmpFile need not be an option).
*/
if (!srcFS.getFileStatus(src).isDir()) {
if (dst.exists()) {
// match the error message in FileUtil.checkDest():
throw new IOException("Target " + dst + " already exists");
}
// use absolute name so that tmp file is always created under dest dir
File tmp = FileUtil.createLocalTempFile(dst.getAbsoluteFile(),
COPYTOLOCAL_PREFIX, true);
if (!FileUtil.copy(srcFS, src, tmp, false, srcFS.getConf(), genCrc)) {
throw new IOException("Failed to copy " + src + " to " + dst);
}
if (!tmp.renameTo(dst)) {
throw new IOException("Failed to rename tmp file " + tmp +
" to local destination \"" + dst + "\".");
}
if (copyCrc) {
if (!(srcFS instanceof ChecksumFileSystem)) {
throw new IOException("Source file system does not have crc files");
}
ChecksumFileSystem csfs = (ChecksumFileSystem) srcFS;
File dstcs = FileSystem.getLocal(srcFS.getConf())
.pathToFile(csfs.getChecksumFile(new Path(dst.getCanonicalPath())));
copyToLocal(csfs.getRawFileSystem(), csfs.getChecksumFile(src),
dstcs, false, genCrc);
}
} else {
// once FileUtil.copy() supports tmp file, we don't need to mkdirs().
dst.mkdirs();
for(FileStatus path : srcFS.listStatus(src)) {
copyToLocal(srcFS, path.getPath(),
new File(dst, path.getPath().getName()), copyCrc,
genCrc);
}
}
}
/**
* Get all the files in the directories that match the source file
* pattern and merge and sort them to only one file on local fs
* srcf is kept.
* @param srcf: a file pattern specifying source files
* @param dstf: a destination local file/directory
* @exception: IOException
* @see org.apache.hadoop.fs.FileSystem.globStatus
*/
void copyMergeToLocal(String srcf, Path dst) throws IOException {
copyMergeToLocal(srcf, dst, false);
}
/**
* Get all the files in the directories that match the source file pattern
* and merge and sort them to only one file on local fs
* srcf is kept.
*
* Also adds a string between the files (useful for adding \n
* to a text file)
* @param srcf: a file pattern specifying source files
* @param dstf: a destination local file/directory
* @param endline: if an end of line character is added to a text file
* @exception: IOException
* @see org.apache.hadoop.fs.FileSystem.globStatus
*/
void copyMergeToLocal(String srcf, Path dst, boolean endline) throws IOException {
Path srcPath = new Path(srcf);
FileSystem srcFs = srcPath.getFileSystem(getConf());
Path [] srcs = FileUtil.stat2Paths(srcFs.globStatus(srcPath),
srcPath);
for(int i=0; i<srcs.length; i++) {
if (endline) {
FileUtil.copyMerge(srcFs, srcs[i],
FileSystem.getLocal(getConf()), dst, false, getConf(), "\n");
} else {
FileUtil.copyMerge(srcFs, srcs[i],
FileSystem.getLocal(getConf()), dst, false, getConf(), null);
}
}
}
/**
* Obtain the indicated file and copy to the local name.
* srcf is removed.
*/
void moveToLocal(String srcf, Path dst) throws IOException {
System.err.println("Option '-moveToLocal' is not implemented yet.");
}
/**
* Fetch all files that match the file pattern <i>srcf</i> and display
* their content on stdout.
* @param srcf: a file pattern specifying source files
* @exception: IOException
* @see org.apache.hadoop.fs.FileSystem.globStatus
*/
void cat(String src, boolean verifyChecksum, final boolean genCrc) throws IOException {
//cat behavior in Linux
// [~/1207]$ ls ?.txt
// x.txt z.txt
// [~/1207]$ cat x.txt y.txt z.txt
// xxx
// cat: y.txt: No such file or directory
// zzz
Path srcPattern = new Path(src);
new DelayedExceptionThrowing() {
@Override
void process(Path p, FileSystem srcFs) throws IOException {
if (srcFs.getFileStatus(p).isDir()) {
throw new IOException("Source must be a file.");
}
if (genCrc) {
printToStdoutAndCRCToStderr(srcFs.open(p), p);
} else {
printToStdout(srcFs.open(p));
}
}
}.globAndProcess(srcPattern, getSrcFileSystem(srcPattern, verifyChecksum));
}
private class TextRecordInputStream extends InputStream {
SequenceFile.Reader r;
WritableComparable key;
Writable val;
DataInputBuffer inbuf;
DataOutputBuffer outbuf;
public TextRecordInputStream(FileStatus f) throws IOException {
r = new SequenceFile.Reader(getFS(), f.getPath(), getConf());
key = ReflectionUtils.newInstance(r.getKeyClass().asSubclass(WritableComparable.class),
getConf());
val = ReflectionUtils.newInstance(r.getValueClass().asSubclass(Writable.class),
getConf());
inbuf = new DataInputBuffer();
outbuf = new DataOutputBuffer();
}
public int read() throws IOException {
int ret;
if (null == inbuf || -1 == (ret = inbuf.read())) {
if (!r.next(key, val)) {
return -1;
}
byte[] tmp = key.toString().getBytes();
outbuf.write(tmp, 0, tmp.length);
outbuf.write('\t');
tmp = val.toString().getBytes();
outbuf.write(tmp, 0, tmp.length);
outbuf.write('\n');
inbuf.reset(outbuf.getData(), outbuf.getLength());
outbuf.reset();
ret = inbuf.read();
}
return ret;
}
}
private InputStream forMagic(Path p, FileSystem srcFs) throws IOException {
FSDataInputStream i = srcFs.open(p);
switch(i.readShort()) {
case 0x1f8b: // RFC 1952
i.seek(0);
return new GZIPInputStream(i);
case 0x5345: // 'S' 'E'
if (i.readByte() == 'Q') {
i.close();
return new TextRecordInputStream(srcFs.getFileStatus(p));
}
break;
}
i.seek(0);
return i;
}
void text(String srcf) throws IOException {
Path srcPattern = new Path(srcf);
new DelayedExceptionThrowing() {
@Override
void process(Path p, FileSystem srcFs) throws IOException {
if (srcFs.isDirectory(p)) {
throw new IOException("Source must be a file.");
}
printToStdout(forMagic(p, srcFs));
}
}.globAndProcess(srcPattern, srcPattern.getFileSystem(getConf()));
}
private InputStream decompress(Path p, FileSystem srcFs) throws IOException {
CompressionCodecFactory factory = new CompressionCodecFactory(getConf());
CompressionCodec codec = factory.getCodec(p);
InputStream in = srcFs.open(p);
if (codec == null) {
throw new IOException("Cannot find codec for " + p);
}
return codec.createInputStream(in);
}
void decompress(String srcf) throws IOException {
Path srcPattern = new Path(srcf);
new DelayedExceptionThrowing() {
@Override
void process(Path p, FileSystem srcFs) throws IOException {
if (srcFs.isDirectory(p)) {
throw new IOException("Source must be a file.");
}
printToStdout(decompress(p, srcFs));
}
}.globAndProcess(srcPattern, srcPattern.getFileSystem(getConf()));
}
/**
* Parse the incoming command string
* @param cmd
* @param pos ignore anything before this pos in cmd
* @throws IOException
*/
private void setReplication(String[] cmd, int pos) throws IOException {
final int minArgs = 2; // We need the replication and at least one path.
CommandFormat c =
new CommandFormat("setrep", minArgs, SETREP_MAX_PATHS, "R", "w");
short rep = 0;
List<String> dsts = null;
try {
List<String> parameters = c.parse(cmd, pos);
rep = Short.parseShort(parameters.get(0));
dsts = parameters.subList(1, parameters.size());
} catch (NumberFormatException nfe) {
System.err.println("Illegal replication, a positive integer expected");
throw nfe;
}
catch(IllegalArgumentException iae) {
System.err.println("Usage: java FsShell " + SETREP_SHORT_USAGE);
throw iae;
}
if (rep < 1) {
System.err.println("Cannot set replication to: " + rep);
throw new IllegalArgumentException("replication must be >= 1");
}
List<Path> waitList = c.getOpt("w")? new ArrayList<Path>(): null;
for (String dst: dsts) {
setReplication(rep, dst, c.getOpt("R"), waitList);
}
if (waitList != null) {
waitForReplication(waitList, rep);
}
}
/**
* Wait for all files in waitList to have replication number equal to rep.
* @param waitList The files are waited for.
* @param rep The new replication number.
* @throws IOException IOException
*/
void waitForReplication(List<Path> waitList, int rep) throws IOException {
for(Path f : waitList) {
System.out.print("Waiting for " + f + " ...");
System.out.flush();
boolean printWarning = false;
FileStatus status = getFS().getFileStatus(f);
long len = status.getLen();
for(boolean done = false; !done; ) {
BlockLocation[] locations = getFS().getFileBlockLocations(status, 0, len);
int i = 0;
for(; i < locations.length &&
locations[i].getHosts().length == rep; i++)
if (!printWarning && locations[i].getHosts().length > rep) {
System.out.println("\nWARNING: the waiting time may be long for "
+ "DECREASING the number of replication.");
printWarning = true;
}
done = i == locations.length;
if (!done) {
System.out.print(".");
System.out.flush();
try {Thread.sleep(10000);} catch (InterruptedException e) {}
}
}
System.out.println(" done");
}
}
/**
* Set the replication for files that match file pattern <i>srcf</i>
* if it's a directory and recursive is true,
* set replication for all the subdirs and those files too.
* @param newRep new replication factor
* @param srcf a file pattern specifying source files
* @param recursive if need to set replication factor for files in subdirs
* @throws IOException
* @see org.apache.hadoop.fs.FileSystem#globStatus(Path)
*/
void setReplication(short newRep, String srcf, boolean recursive,
List<Path> waitingList)
throws IOException {
Path srcPath = new Path(srcf);
FileSystem srcFs = srcPath.getFileSystem(getConf());
Path[] srcs = FileUtil.stat2Paths(srcFs.globStatus(srcPath),
srcPath);
for(int i=0; i<srcs.length; i++) {
setReplication(newRep, srcFs, srcs[i], recursive, waitingList);
}
}
private void setReplication(short newRep, FileSystem srcFs,
Path src, boolean recursive,
List<Path> waitingList)
throws IOException {
if (!srcFs.getFileStatus(src).isDir()) {
setFileReplication(src, srcFs, newRep, waitingList);
return;
}
FileStatus items[] = srcFs.listStatus(src);
if (items == null) {
throw new IOException("Could not get listing for " + src);
} else {
for (int i = 0; i < items.length; i++) {
if (!items[i].isDir()) {
setFileReplication(items[i].getPath(), srcFs, newRep, waitingList);
} else if (recursive) {
setReplication(newRep, srcFs, items[i].getPath(), recursive,
waitingList);
}
}
}
}
/**
* Actually set the replication for this file
* If it fails either throw IOException or print an error msg
* @param file: a file/directory
* @param newRep: new replication factor
* @throws IOException
*/
private void setFileReplication(Path file, FileSystem srcFs, short newRep, List<Path> waitList)
throws IOException {
if (srcFs.setReplication(file, newRep)) {
if (waitList != null) {
waitList.add(file);
}
System.out.println("Replication " + newRep + " set: " + file);
} else {
System.err.println("Could not set replication for: " + file);
}
}
/**
* Get a listing of all files in that match the file pattern <i>srcf</i>.
* @param srcf a file pattern specifying source files
* @param flags LS options.
* @throws IOException
* @see org.apache.hadoop.fs.FileSystem#globStatus(Path)
*/
private int ls(String srcf, EnumSet<LsOption> flags) throws IOException {
Path srcPath = new Path(srcf);
FileSystem srcFs = srcPath.getFileSystem(this.getConf());
FileStatus[] srcs = srcFs.globStatus(srcPath);
if (srcs==null || srcs.length==0) {
throw new FileNotFoundException("Cannot access " + srcf +
": No such file or directory.");
}
boolean printHeader = (srcs.length == 1) ? true: false;
int numOfErrors = 0;
for(int i=0; i<srcs.length; i++) {
numOfErrors += ls(srcs[i], srcFs, flags, printHeader);
}
return numOfErrors == 0 ? 0 : -1;
}
/* list all files under the directory <i>src</i>
* ideally we should provide "-l" option, that lists like "ls -l".
*/
private int ls(FileStatus src, FileSystem srcFs, EnumSet<LsOption> flags,
boolean printHeader) throws IOException {
final boolean recursive = flags.contains(LsOption.Recursive);
final boolean withBlockSize = flags.contains(LsOption.WithBlockSize);
final String cmd = recursive? "lsr": "ls";
final FileStatus[] items = shellListStatus(cmd, srcFs, src);
if (items == null) {
return 1;
} else {
int numOfErrors = 0;
if (!recursive && printHeader) {
if (items.length != 0) {
System.out.println("Found " + items.length + " items");
}
}
int maxReplication = 3, maxLen = 10, maxOwner = 0,maxGroup = 0;
for(int i = 0; i < items.length; i++) {
FileStatus stat = items[i];
int replication = String.valueOf(stat.getReplication()).length();
int len = String.valueOf(stat.getLen()).length();
int owner = String.valueOf(stat.getOwner()).length();
int group = String.valueOf(stat.getGroup()).length();
if (replication > maxReplication) maxReplication = replication;
if (len > maxLen) maxLen = len;
if (owner > maxOwner) maxOwner = owner;
if (group > maxGroup) maxGroup = group;
}
for (int i = 0; i < items.length; i++) {
FileStatus stat = items[i];
Path cur = stat.getPath();
String mdate = dateForm.format(new Date(stat.getModificationTime()));
System.out.print((stat.isDir() ? "d" : "-") +
stat.getPermission() + " ");
System.out.printf("%"+ maxReplication +
"s ", (!stat.isDir() ? stat.getReplication() : "-"));
if (maxOwner > 0)
System.out.printf("%-"+ maxOwner + "s ", stat.getOwner());
if (maxGroup > 0)
System.out.printf("%-"+ maxGroup + "s ", stat.getGroup());
System.out.printf("%"+ maxLen + "d ", stat.getLen());
if (withBlockSize)
System.out.printf("%"+ maxLen + "d ", stat.getBlockSize());
System.out.print(mdate + " ");
System.out.println(cur.toUri().getPath());
if (recursive && stat.isDir()) {
numOfErrors += ls(stat,srcFs, flags, printHeader);
}
}
return numOfErrors;
}
}
/**
* Show the size of all files that match the file pattern <i>src</i>
* @param src a file pattern specifying source files
* @throws IOException
* @see org.apache.hadoop.fs.FileSystem#globStatus(Path)
*/
void du(String src) throws IOException {
Path srcPath = new Path(src);
FileSystem srcFs = srcPath.getFileSystem(getConf());
Path[] pathItems = FileUtil.stat2Paths(srcFs.globStatus(srcPath),
srcPath);
FileStatus items[] = srcFs.listStatus(pathItems);
if ((items == null) || ((items.length == 0) &&
(!srcFs.exists(srcPath)))){
throw new FileNotFoundException("Cannot access " + src
+ ": No such file or directory.");
} else {
System.out.println("Found " + items.length + " items");
int maxLength = 10;
long length[] = new long[items.length];
for (int i = 0; i < items.length; i++) {
length[i] = items[i].isDir() ?
srcFs.getContentSummary(items[i].getPath()).getLength() :
items[i].getLen();
int len = String.valueOf(length[i]).length();
if (len > maxLength) maxLength = len;
}
for(int i = 0; i < items.length; i++) {
System.out.printf("%-"+ (maxLength + BORDER) +"d", length[i]);
System.out.println(items[i].getPath());
}
}
}
/**
* Show the summary disk usage of each dir/file
* that matches the file pattern <i>src</i>
* @param src a file pattern specifying source files
* @throws IOException
* @see org.apache.hadoop.fs.FileSystem#globStatus(Path)
*/
void dus(String src) throws IOException {
Path srcPath = new Path(src);
FileSystem srcFs = srcPath.getFileSystem(getConf());
FileStatus status[] = srcFs.globStatus(new Path(src));
if (status==null || status.length==0) {
throw new FileNotFoundException("Cannot access " + src +
": No such file or directory.");
}
for(int i=0; i<status.length; i++) {
long totalSize = srcFs.getContentSummary(status[i].getPath()).getLength();
String pathStr = status[i].getPath().toString();
System.out.println(("".equals(pathStr)?".":pathStr) + "\t" + totalSize);
}
}
/*
* Remove the given dir pattern if it is empty
*/
void rmdir(String src, final boolean ignoreFailOnEmpty,
final boolean skipTrash) throws IOException {
Path fPattern = new Path(src);
new DelayedExceptionThrowing() {
@Override
void process(Path p, FileSystem srcFs) throws IOException {
delete(p, srcFs, false, true, ignoreFailOnEmpty, false);
}
}.globAndProcess(fPattern, fPattern.getFileSystem(getConf()));
}
/**
* Create the given dir
*/
void mkdir(String src) throws IOException {
Path f = new Path(src);
FileSystem srcFs = f.getFileSystem(getConf());
FileStatus fstatus = null;
try {
fstatus = srcFs.getFileStatus(f);
if (fstatus.isDir()) {
throw new IOException("cannot create directory "
+ src + ": File exists");
}
else {
throw new IOException(src + " exists but " +
"is not a directory");
}
} catch(FileNotFoundException e) {
if (!srcFs.mkdirs(f)) {
throw new IOException("failed to create " + src);
}
}
}
/**
* (Re)create zero-length file at the specified path.
* This will be replaced by a more UNIX-like touch when files may be
* modified.
*/
void touchz(String src) throws IOException {
Path f = new Path(src);
FileSystem srcFs = f.getFileSystem(getConf());
FileStatus st;
if (srcFs.exists(f)) {
st = srcFs.getFileStatus(f);
if (st.isDir()) {
// TODO: handle this
throw new IOException(src + " is a directory");
} else if (st.getLen() != 0)
throw new IOException(src + " must be a zero-length file");
}
FSDataOutputStream out = srcFs.create(f);
out.close();
}
/**
* Check file types.
*/
int test(String argv[], int i) throws IOException {
if (!argv[i].startsWith("-") || argv[i].length() > 2)
throw new IOException("Not a flag: " + argv[i]);
char flag = argv[i].toCharArray()[1];
Path f = new Path(argv[++i]);
FileSystem srcFs = f.getFileSystem(getConf());
switch(flag) {
case 'e':
return srcFs.exists(f) ? 0 : 1;
case 'z':
return srcFs.getFileStatus(f).getLen() == 0 ? 0 : 1;
case 'd':
return srcFs.getFileStatus(f).isDir() ? 0 : 1;
default:
throw new IOException("Unknown flag: " + flag);
}
}
/**
* Print statistics about path in specified format.
* Format sequences:
* %b: Size of file in blocks
* %n: Filename
* %o: Block size
* %r: replication
* %y: UTC date as "yyyy-MM-dd HH:mm:ss"
* %Y: Milliseconds since January 1, 1970 UTC
*/
void stat(char[] fmt, String src) throws IOException {
Path srcPath = new Path(src);
FileSystem srcFs = srcPath.getFileSystem(getConf());
FileStatus glob[] = srcFs.globStatus(srcPath);
if (null == glob)
throw new IOException("cannot stat `" + src + "': No such file or directory");
for (FileStatus f : glob) {
StringBuilder buf = new StringBuilder();
for (int i = 0; i < fmt.length; ++i) {
if (fmt[i] != '%') {
buf.append(fmt[i]);
} else {
if (i + 1 == fmt.length) break;
switch(fmt[++i]) {
case 'b':
buf.append(f.getLen());
break;
case 'F':
buf.append(f.isDir() ? "directory" : "regular file");
break;
case 'n':
buf.append(f.getPath().getName());
break;
case 'o':
buf.append(f.getBlockSize());
break;
case 'r':
buf.append(f.getReplication());
break;
case 'y':
buf.append(modifFmt.format(new Date(f.getModificationTime())));
break;
case 'Y':
buf.append(f.getModificationTime());
break;
default:
buf.append(fmt[i]);
break;
}
}
}
System.out.println(buf.toString());
}
}
/**
* Move files that match the file pattern <i>srcf</i>
* to a destination file.
* When moving mutiple files, the destination must be a directory.
* Otherwise, IOException is thrown.
* @param srcf a file pattern specifying source files
* @param dstf a destination local file/directory
* @throws IOException
* @see org.apache.hadoop.fs.FileSystem#globStatus(Path)
*/
void rename(String srcf, String dstf) throws IOException {
Path srcPath = new Path(srcf);
Path dstPath = new Path(dstf);
FileSystem srcFs = srcPath.getFileSystem(getConf());
FileSystem dstFs = dstPath.getFileSystem(getConf());
URI srcURI = srcFs.getUri();
URI dstURI = dstFs.getUri();
if (srcURI.compareTo(dstURI) != 0) {
throw new IOException("src and destination filesystems do not match.");
}
Path[] srcs = FileUtil.stat2Paths(srcFs.globStatus(srcPath), srcPath);
Path dst = new Path(dstf);
if (srcs.length > 1 && !srcFs.isDirectory(dst)) {
throw new IOException("When moving multiple files, "
+ "destination should be a directory.");
}
for(int i=0; i<srcs.length; i++) {
if (!srcFs.rename(srcs[i], dst)) {
FileStatus srcFstatus = null;
FileStatus dstFstatus = null;
try {
srcFstatus = srcFs.getFileStatus(srcs[i]);
} catch(FileNotFoundException e) {
throw new FileNotFoundException(srcs[i] +
": No such file or directory");
}
try {
dstFstatus = dstFs.getFileStatus(dst);
} catch(IOException e) {
}
if((srcFstatus!= null) && (dstFstatus!= null)) {
if (srcFstatus.isDir() && !dstFstatus.isDir()) {
throw new IOException("cannot overwrite non directory "
+ dst + " with directory " + srcs[i]);
}
}
throw new IOException("Failed to rename " + srcs[i] + " to " + dst);
}
}
}
/**
* Move/rename file(s) to a destination file. Multiple source
* files can be specified. The destination is the last element of
* the argvp[] array.
* If multiple source files are specified, then the destination
* must be a directory. Otherwise, IOException is thrown.
* @exception: IOException
*/
private int rename(String argv[], Configuration conf) throws IOException {
int i = 0;
int exitCode = 0;
String cmd = argv[i++];
String dest = argv[argv.length-1];
//
// If the user has specified multiple source files, then
// the destination has to be a directory
//
if (argv.length > 3) {
Path dst = new Path(dest);
FileSystem dstFs = dst.getFileSystem(getConf());
if (!dstFs.isDirectory(dst)) {
throw new IOException("When moving multiple files, "
+ "destination " + dest + " should be a directory.");
}
}
//
// for each source file, issue the rename
//
for (; i < argv.length - 1; i++) {
try {
//
// issue the rename to the fs
//
rename(argv[i], dest);
} catch (RemoteException e) {
//
// This is a error returned by hadoop server. Print
// out the first line of the error mesage.
//
exitCode = -1;
try {
String[] content;
content = e.getLocalizedMessage().split("\n");
System.err.println(cmd.substring(1) + ": " + content[0]);
} catch (Exception ex) {
System.err.println(cmd.substring(1) + ": " +
ex.getLocalizedMessage());
}
} catch (IOException e) {
//
// IO exception encountered locally.
//
exitCode = -1;
System.err.println(cmd.substring(1) + ": " +
e.getLocalizedMessage());
}
}
return exitCode;
}
/**
* Copy files that match the file pattern <i>srcf</i>
* to a destination file.
* When copying mutiple files, the destination must be a directory.
* Otherwise, IOException is thrown.
* @param srcf a file pattern specifying source files
* @param dstf a destination local file/directory
* @throws IOException
* @see org.apache.hadoop.fs.FileSystem#globStatus(Path)
*/
void copy(String srcf, String dstf, Configuration conf) throws IOException {
Path srcPath = new Path(srcf);
FileSystem srcFs = srcPath.getFileSystem(getConf());
Path dstPath = new Path(dstf);
FileSystem dstFs = dstPath.getFileSystem(getConf());
Path [] srcs = FileUtil.stat2Paths(srcFs.globStatus(srcPath), srcPath);
if (srcs.length > 1 && !dstFs.isDirectory(dstPath)) {
throw new IOException("When copying multiple files, "
+ "destination should be a directory.");
}
for(int i=0; i<srcs.length; i++) {
FileUtil.copy(srcFs, srcs[i], dstFs, dstPath, false, conf);
}
}
/**
* Copy file(s) to a destination file. Multiple source
* files can be specified. The destination is the last element of
* the argvp[] array.
* If multiple source files are specified, then the destination
* must be a directory. Otherwise, IOException is thrown.
* @exception: IOException
*/
private int copy(String argv[], Configuration conf) throws IOException {
int i = 0;
int exitCode = 0;
String cmd = argv[i++];
String dest = argv[argv.length-1];
//
// If the user has specified multiple source files, then
// the destination has to be a directory
//
if (argv.length > 3) {
Path dst = new Path(dest);
if (!getFS().isDirectory(dst)) {
throw new IOException("When copying multiple files, "
+ "destination " + dest + " should be a directory.");
}
}
//
// for each source file, issue the copy
//
for (; i < argv.length - 1; i++) {
try {
//
// issue the copy to the fs
//
copy(argv[i], dest, conf);
} catch (RemoteException e) {
//
// This is a error returned by hadoop server. Print
// out the first line of the error mesage.
//
exitCode = -1;
try {
String[] content;
content = e.getLocalizedMessage().split("\n");
System.err.println(cmd.substring(1) + ": " +
content[0]);
} catch (Exception ex) {
System.err.println(cmd.substring(1) + ": " +
ex.getLocalizedMessage());
}
} catch (IOException e) {
//
// IO exception encountered locally.
//
exitCode = -1;
System.err.println(cmd.substring(1) + ": " +
e.getLocalizedMessage());
}
}
return exitCode;
}
/**
* Compress a file.
*/
private int compress(String argv[], Configuration conf) throws IOException {
int i = 0;
String cmd = argv[i++];
String srcf = argv[i++];
String dstf = argv[i++];
Path srcPath = new Path(srcf);
FileSystem srcFs = srcPath.getFileSystem(getConf());
Path dstPath = new Path(dstf);
FileSystem dstFs = dstPath.getFileSystem(getConf());
// Create codec
CompressionCodecFactory factory = new CompressionCodecFactory(conf);
CompressionCodec codec = factory.getCodec(dstPath);
if (codec == null) {
System.err.println(cmd.substring(1) + ": cannot find compression codec for "
+ dstf);
return 1;
}
// open input stream
InputStream in = srcFs.open(srcPath);
// Create compression stream
OutputStream out = dstFs.create(dstPath);
out = codec.createOutputStream(out);
IOUtils.copyBytes(in, out, conf, true);
return 0;
}
/**
* Delete all files that match the file pattern <i>srcf</i>.
* @param srcf a file pattern specifying source files
* @param recursive if need to delete subdirs
* @param skipTrash Should we skip the trash, if it's enabled?
* @throws IOException
* @see org.apache.hadoop.fs.FileSystem#globStatus(Path)
*/
void delete(String srcf, final boolean recursive, final boolean skipTrash)
throws IOException {
//rm behavior in Linux
// [~/1207]$ ls ?.txt
// x.txt z.txt
// [~/1207]$ rm x.txt y.txt z.txt
// rm: cannot remove `y.txt': No such file or directory
Path srcPattern = new Path(srcf);
new DelayedExceptionThrowing() {
@Override
void process(Path p, FileSystem srcFs) throws IOException {
delete(p, srcFs, recursive, skipTrash, false, true);
}
}.globAndProcess(srcPattern, srcPattern.getFileSystem(getConf()));
}
public void delete(Path src, FileSystem srcFs, boolean recursive,
boolean skipTrash) throws IOException {
delete(src, srcFs, recursive, skipTrash, false, true);
}
/* delete a file */
public void delete(Path src, FileSystem srcFs, boolean recursive,
boolean skipTrash, boolean ignoreNonEmpty,
boolean rmContext) throws IOException {
FileStatus fs = null;
try {
fs = srcFs.getFileStatus(src);
} catch (FileNotFoundException fnfe) {
// Have to re-throw so that console output is as expected
throw new FileNotFoundException("cannot remove "
+ src + ": No such file or directory.");
}
if (fs.isDir() && !recursive) {
// We may safely delete empty directories if
// the recursive option is not specified
FileStatus children[] = srcFs.listStatus(src);
if (rmContext || (children != null && children.length != 0)) {
if (ignoreNonEmpty) {
return;
} else {
throw new IOException("Cannot remove directory \"" + src + "\"," +
" use -rmr instead");
}
} else if (children == null) {
throw new IOException(src + " no longer exists");
}
}
if(!skipTrash) {
try {
Trash trashTmp = new Trash(srcFs, getConf());
if (trashTmp.moveToTrash(src)) {
System.err.println("Moved to trash: " + src);
return;
}
} catch (IOException e) {
Exception cause = (Exception) e.getCause();
String msg = "";
if(cause != null) {
msg = cause.getLocalizedMessage();
}
System.err.println("Problem with Trash." + msg +". Consider using -skipTrash option");
throw e;
}
}
if (srcFs.delete(src, recursive)) {
System.err.println("Deleted " + src);
} else {
throw new IOException("Delete failed " + src);
}
}
/** Undelete a file
* @param src path to the file in the trash
* @param srcFs FileSystem instance
* @param userName name of the user whose trash will be searched, or
* null for current user
* @return true if the file was deleted
* @throws IOException
*/
public boolean undelete(String src, FileSystem srcFs, String userName)
throws IOException {
boolean result = srcFs.undelete(new Path(src), userName);
if (result)
System.err.println("Moved from trash: " + src);
return result;
}
private void expunge() throws IOException {
getTrash().expunge();
getTrash().checkpoint();
}
/**
* Returns the Trash object associated with this shell.
*/
public Path getCurrentTrashDir() throws IOException{
return getTrash().getCurrentTrashDir();
}
/**
* Parse the incoming command string
* @param cmd
* @param pos ignore anything before this pos in cmd
* @throws IOException
*/
private void tail(String[] cmd, int pos) throws IOException {
CommandFormat c = new CommandFormat("tail", 1, 1, "f");
String src = null;
Path path = null;
try {
List<String> parameters = c.parse(cmd, pos);
src = parameters.get(0);
} catch(IllegalArgumentException iae) {
System.err.println("Usage: java FsShell " + TAIL_USAGE);
throw iae;
}
boolean foption = c.getOpt("f") ? true: false;
path = new Path(src);
FileSystem srcFs = path.getFileSystem(getConf());
if (srcFs.isDirectory(path)) {
throw new IOException("Source must be a file.");
}
long fileSize = srcFs.getFileStatus(path).getLen();
long offset = (fileSize > 1024) ? fileSize - 1024: 0;
while (true) {
FSDataInputStream in = srcFs.open(path);
in.seek(offset);
IOUtils.copyBytes(in, System.out, 1024, false);
offset = in.getPos();
in.close();
if (!foption) {
break;
}
fileSize = srcFs.getFileStatus(path).getLen();
offset = (fileSize > offset) ? offset: fileSize;
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
break;
}
}
}
/**
* Parse the incoming command string
* @param cmd
* @param pos ignore anything before this pos in cmd
* @throws IOException
*/
private void head(String[] cmd, int pos) throws IOException {
CommandFormat c = new CommandFormat("head", 1, 1);
String src = null;
Path path = null;
try {
List<String> parameters = c.parse(cmd, pos);
src = parameters.get(0);
} catch(IllegalArgumentException iae) {
System.err.println("Usage: java FsShell " + HEAD_USAGE);
throw iae;
}
path = new Path(src);
FileSystem srcFs = path.getFileSystem(getConf());
if (srcFs.isDirectory(path)) {
throw new IOException("Source must be a file.");
}
long fileSize = srcFs.getFileStatus(path).getLen();
int len = (fileSize > 1024) ? 1024 : (int) fileSize;
FSDataInputStream in = srcFs.open(path);
byte buf[] = new byte[len];
IOUtils.readFully(in, buf, 0, len);
System.out.write(buf);
System.out.write('\n');
in.close();
}
/**
* This class runs a command on a given FileStatus. This can be used for
* running various commands like chmod, chown etc.
*/
static abstract class CmdHandler {
protected int errorCode = 0;
protected boolean okToContinue = true;
protected String cmdName;
int getErrorCode() { return errorCode; }
boolean okToContinue() { return okToContinue; }
String getName() { return cmdName; }
protected CmdHandler(String cmdName, FileSystem fs) {
this.cmdName = cmdName;
}
public abstract void run(FileStatus file, FileSystem fs) throws IOException;
}
/** helper returns listStatus() */
private static FileStatus[] shellListStatus(String cmd,
FileSystem srcFs,
FileStatus src) {
if (!src.isDir()) {
FileStatus[] files = { src };
return files;
}
Path path = src.getPath();
try {
FileStatus[] files = srcFs.listStatus(path);
if ( files == null ) {
System.err.println(cmd +
": could not get listing for '" + path + "'");
}
return files;
} catch (IOException e) {
System.err.println(cmd +
": could not get get listing for '" + path + "' : " +
e.getMessage().split("\n")[0]);
}
return null;
}
/**
* Runs the command on a given file with the command handler.
* If recursive is set, command is run recursively.
*/
private static int runCmdHandler(CmdHandler handler, FileStatus stat,
FileSystem srcFs,
boolean recursive) throws IOException {
int errors = 0;
handler.run(stat, srcFs);
if (recursive && stat.isDir() && handler.okToContinue()) {
FileStatus[] files = shellListStatus(handler.getName(), srcFs, stat);
if (files == null) {
return 1;
}
for(FileStatus file : files ) {
errors += runCmdHandler(handler, file, srcFs, recursive);
}
}
return errors;
}
///top level runCmdHandler
int runCmdHandler(CmdHandler handler, String[] args,
int startIndex, boolean recursive)
throws IOException {
int errors = 0;
for (int i=startIndex; i<args.length; i++) {
Path srcPath = new Path(args[i]);
FileSystem srcFs = srcPath.getFileSystem(getConf());
Path[] paths = FileUtil.stat2Paths(srcFs.globStatus(srcPath), srcPath);
for(Path path : paths) {
try {
FileStatus file = srcFs.getFileStatus(path);
if (file == null) {
System.err.println(handler.getName() +
": could not get status for '" + path + "'");
errors++;
} else {
errors += runCmdHandler(handler, file, srcFs, recursive);
}
} catch (IOException e) {
String msg = (e.getMessage() != null ? e.getLocalizedMessage() :
(e.getCause().getMessage() != null ?
e.getCause().getLocalizedMessage() : "null"));
System.err.println(handler.getName() + ": could not get status for '"
+ path + "': " + msg.split("\n")[0]);
}
}
}
return (errors > 0 || handler.getErrorCode() != 0) ? 1 : 0;
}
/**
* Return an abbreviated English-language desc of the byte length
* @deprecated Consider using {@link org.apache.hadoop.util.StringUtils#byteDesc} instead.
*/
@Deprecated
public static String byteDesc(long len) {
return StringUtils.byteDesc(len);
}
/**
* @deprecated Consider using {@link org.apache.hadoop.util.StringUtils#limitDecimalTo2} instead.
*/
@Deprecated
public static synchronized String limitDecimalTo2(double d) {
return StringUtils.limitDecimalTo2(d);
}
private void printHelp(String cmd) {
String summary = "hadoop fs is the command to execute fs commands. " +
"The full syntax is: \n\n" +
"hadoop fs [-fs <local | file system URI>] [-conf <configuration file>]\n\t" +
"[-D <property=value>] [-ls <path>] [-lsr <path>] [-lsrx <path>] [-du <path>]\n\t" +
"[-dus <path>] [-mv <src> <dst>] [-cp <src> <dst>] [-rm [-skipTrash] <src>]\n\t" +
"[-rmr [-skipTrash] <src>] [-put <localsrc> ... <dst>]\n\t" +
"[-rmdir [-ignore-fail-on-non-empty] <src>]\n\t" +
"[-copyFromLocal <localsrc> ... <dst>]\n\t" +
"[-moveFromLocal <localsrc> ... <dst>] [" +
GET_SHORT_USAGE + "\n\t" +
"[-getmerge <src> <localdst> [addnl]] [-cat <src>]\n\t" +
"[" + COPYTOLOCAL_SHORT_USAGE + "] [-moveToLocal <src> <localdst>]\n\t" +
"[-mkdir <path>] [-report] [" + SETREP_SHORT_USAGE + "]\n\t" +
"[-touchz <path>] [" + FsShellTouch.TOUCH_USAGE + "]\n\t" +
"[-test -[ezd] <path>] [-stat [format] <path>]\n\t" +
"[-head <path>] [-tail [-f] <path>] [-text <path>]\n\t" +
"[-decompress <path>] [-compress <src> <tgt>]\n\t" +
"[-undelete [-u <username>] <path>]\n\t" +
"[" + FsShellPermissions.CHMOD_USAGE + "]\n\t" +
"[" + FsShellPermissions.CHOWN_USAGE + "]\n\t" +
"[" + FsShellPermissions.CHGRP_USAGE + "]\n\t" +
"[" + Count.USAGE + "]\n\t" +
"[-help [cmd]]\n";
String conf ="-conf <configuration file>: Specify an application configuration file.";
String D = "-D <property=value>: Use value for given property.";
String fs = "-fs [local | <file system URI>]: \tSpecify the file system to use.\n" +
"\t\tIf not specified, the current configuration is used, \n" +
"\t\ttaken from the following, in increasing precedence: \n" +
"\t\t\tcore-default.xml inside the hadoop jar file \n" +
"\t\t\tcore-site.xml in $HADOOP_CONF_DIR \n" +
"\t\t'local' means use the local file system as your DFS. \n" +
"\t\t<file system URI> specifies a particular file system to \n" +
"\t\tcontact. This argument is optional but if used must appear\n" +
"\t\tappear first on the command line. Exactly one additional\n" +
"\t\targument must be specified. \n";
String ls = "-ls <path>: \tList the contents that match the specified file pattern. If\n" +
"\t\tpath is not specified, the contents of /user/<currentUser>\n" +
"\t\twill be listed. Directory entries are of the form \n" +
"\t\t\tdirName (full path) <dir> \n" +
"\t\tand file entries are of the form \n" +
"\t\t\tfileName(full path) <r n> size \n" +
"\t\twhere n is the number of replicas specified for the file \n" +
"\t\tand size is the size of the file, in bytes.\n";
String lsr = "-lsr <path>: \tRecursively list the contents that match the specified\n" +
"\t\tfile pattern. Behaves very similarly to hadoop fs -ls,\n" +
"\t\texcept that the data is shown for all the entries in the\n" +
"\t\tsubtree.\n";
String lsrx = "-lsrx <path>: \tRecursively list the contents that match the specified\n" +
"\t\tfile pattern. Behaves very similarly to hadoop fs -lsr,\n" +
"\t\texcept that block size of files is also shown.\n";
String du = "-du <path>: \tShow the amount of space, in bytes, used by the files that \n" +
"\t\tmatch the specified file pattern. Equivalent to the unix\n" +
"\t\tcommand \"du -sb <path>/*\" in case of a directory, \n" +
"\t\tand to \"du -b <path>\" in case of a file.\n" +
"\t\tThe output is in the form \n" +
"\t\t\tname(full path) size (in bytes)\n";
String dus = "-dus <path>: \tShow the amount of space, in bytes, used by the files that \n" +
"\t\tmatch the specified file pattern. Equivalent to the unix\n" +
"\t\tcommand \"du -sb\" The output is in the form \n" +
"\t\t\tname(full path) size (in bytes)\n";
String mv = "-mv <src> <dst>: Move files that match the specified file pattern <src>\n" +
"\t\tto a destination <dst>. When moving multiple files, the \n" +
"\t\tdestination must be a directory. \n";
String cp = "-cp <src> <dst>: Copy files that match the file pattern <src> to a \n" +
"\t\tdestination. When copying multiple files, the destination\n" +
"\t\tmust be a directory. \n";
String rm = "-rm [-skipTrash] <src>: \tDelete all files that match the specified file pattern.\n" +
"\t\tEquivalent to the Unix command \"rm <src>\"\n" +
"\t\t-skipTrash option bypasses trash, if enabled, and immediately\n" +
"deletes <src>";
String rmr = "-rmr [-skipTrash] <src>: \tRemove all directories which match the specified file \n" +
"\t\tpattern. Equivalent to the Unix command \"rm -rf <src>\"\n" +
"\t\t-skipTrash option bypasses trash, if enabled, and immediately\n" +
"deletes <src>";
String rmdir = "-rmdir [-ignore-fail-on-non-empty] <src>: \tRemoves the directory entry \n" +
"\t\tspecified by the directory argument, provided it is empty. \n";
String put = "-put <localsrc> ... <dst>: \tCopy files " +
"from the local file system \n\t\tinto fs. \n";
String copyFromLocal = "-copyFromLocal <localsrc> ... <dst>:" +
" Identical to the -put command.\n";
String moveFromLocal = "-moveFromLocal <localsrc> ... <dst>:" +
" Same as -put, except that the source is\n\t\tdeleted after it's copied.\n";
String get = GET_SHORT_USAGE
+ ": Copy files that match the file pattern <src> \n" +
"\t\tto the local name. <src> is kept. When copying mutiple, \n" +
"\t\tfiles, the destination must be a directory. " +
"\t\twhen -gencrc is given, it will print out CRC32 checksum of the file in stderr\n";
String getmerge = "-getmerge <src> <localdst>: Get all the files in the directories that \n" +
"\t\tmatch the source file pattern and merge and sort them to only\n" +
"\t\tone file on local fs. <src> is kept.\n";
String cat = "-cat <src>: \tFetch all files that match the file pattern <src> \n" +
"\t\tand display their content on stdout.\n";
String text = "-text <src>: \tTakes a source file and outputs the file in text format.\n" +
"\t\tThe allowed formats are zip and TextRecordInputStream.\n";
String decompress = "-decompress <src>: \tTakes a source file and decompress the file based on file name extension.\n" +
"\t\tThe allowed formats are any registered compressed file formats.\n";
String compress = "-compress <src> <tgt>: \tTakes a source file and compress the file to target.\n" +
"\t\tThe compression codec is determined by the target file name extension.";
String undelete = "-undelete [-u <username>] <src>: \tUndelete a file from the trash folder\n" +
"\t\tIf -u <username> is supplied, attempt to undelete from given users\n" +
"\t\ttrash, otherwise use current users trash as default\n";
String copyToLocal = COPYTOLOCAL_SHORT_USAGE
+ ": Identical to the -get command.\n";
String moveToLocal = "-moveToLocal <src> <localdst>: Not implemented yet \n";
String mkdir = "-mkdir <path>: \tCreate a directory in specified location. \n";
String setrep = SETREP_SHORT_USAGE
+ ": Set the replication level of a file. \n"
+ "\t\tThe -R flag requests a recursive change of replication level \n"
+ "\t\tfor an entire tree.\n";
String touchz = "-touchz <path>: Write a timestamp in yyyy-MM-dd HH:mm:ss format\n" +
"\t\tin a file at <path>. An error is returned if the file exists with non-zero length\n";
String touch = FsShellTouch.TOUCH_USAGE + "\n" +
"\t\tUpdate the access and modification times of each PATH to the current time.\n" +
"\t\tIf PATH does not exist, create empty file.\n\n" +
"\t-a\tChange only access time\n" +
"\t-c, --no-create\n" +
"\t\tDo not create any files\n" +
"\t-d, --date=\"yyyy-MM-dd HH:mm:ss\"\n" +
"\t\tUse specified date instead of current time\n" +
"\t-m\tChange only modification time\n" +
"\t-u timestamp\n" +
"\t\tUse specified timestamp instead of date";
String test = "-test -[ezd] <path>: If file { exists, has zero length, is a directory\n" +
"\t\tthen return 0, else return 1.\n";
String stat = "-stat [format] <path>: Print statistics about the file/directory at <path>\n" +
"\t\tin the specified format. Format accepts filesize in blocks (%b), filename (%n),\n" +
"\t\tblock size (%o), replication (%r), modification date (%y, %Y)\n";
String tail = TAIL_USAGE
+ ": Show the last 1KB of the file. \n"
+ "\t\tThe -f option shows apended data as the file grows. \n";
String head = HEAD_USAGE
+ ": Show the first 1KB of the file. \n";
String chmod = FsShellPermissions.CHMOD_USAGE + "\n" +
"\t\tChanges permissions of a file.\n" +
"\t\tThis works similar to shell's chmod with a few exceptions.\n\n" +
"\t-R\tmodifies the files recursively. This is the only option\n" +
"\t\tcurrently supported.\n\n" +
"\tMODE\tMode is same as mode used for chmod shell command.\n" +
"\t\tOnly letters recognized are 'rwxX'. E.g. a+r,g-w,+rwx,o=r\n\n" +
"\tOCTALMODE Mode specifed in 3 digits. Unlike shell command,\n" +
"\t\tthis requires all three digits.\n" +
"\t\tE.g. 754 is same as u=rwx,g=rx,o=r\n\n" +
"\t\tIf none of 'augo' is specified, 'a' is assumed and unlike\n" +
"\t\tshell command, no umask is applied.\n";
String chown = FsShellPermissions.CHOWN_USAGE + "\n" +
"\t\tChanges owner and group of a file.\n" +
"\t\tThis is similar to shell's chown with a few exceptions.\n\n" +
"\t-R\tmodifies the files recursively. This is the only option\n" +
"\t\tcurrently supported.\n\n" +
"\t\tIf only owner or group is specified then only owner or\n" +
"\t\tgroup is modified.\n\n" +
"\t\tThe owner and group names may only cosists of digits, alphabet,\n"+
"\t\tand any of '-_.@/' i.e. [-_.@/a-zA-Z0-9]. The names are case\n" +
"\t\tsensitive.\n\n" +
"\t\tWARNING: Avoid using '.' to separate user name and group though\n" +
"\t\tLinux allows it. If user names have dots in them and you are\n" +
"\t\tusing local file system, you might see surprising results since\n" +
"\t\tshell command 'chown' is used for local files.\n";
String chgrp = FsShellPermissions.CHGRP_USAGE + "\n" +
"\t\tThis is equivalent to -chown ... :GROUP ...\n";
String help = "-help [cmd]: \tDisplays help for given command or all commands if none\n" +
"\t\tis specified.\n";
if ("fs".equals(cmd)) {
System.out.println(fs);
} else if ("conf".equals(cmd)) {
System.out.println(conf);
} else if ("D".equals(cmd)) {
System.out.println(D);
} else if ("ls".equals(cmd)) {
System.out.println(ls);
} else if ("lsr".equals(cmd)) {
System.out.println(lsr);
} else if ("lsrx".equals(cmd)) {
System.out.println(lsrx);
} else if ("du".equals(cmd)) {
System.out.println(du);
} else if ("dus".equals(cmd)) {
System.out.println(dus);
} else if ("rm".equals(cmd)) {
System.out.println(rm);
} else if ("rmr".equals(cmd)) {
System.out.println(rmr);
} else if ("rmdir".equals(cmd)) {
System.out.println(rmdir);
} else if ("mkdir".equals(cmd)) {
System.out.println(mkdir);
} else if ("mv".equals(cmd)) {
System.out.println(mv);
} else if ("cp".equals(cmd)) {
System.out.println(cp);
} else if ("put".equals(cmd)) {
System.out.println(put);
} else if ("copyFromLocal".equals(cmd)) {
System.out.println(copyFromLocal);
} else if ("moveFromLocal".equals(cmd)) {
System.out.println(moveFromLocal);
} else if ("get".equals(cmd)) {
System.out.println(get);
} else if ("getmerge".equals(cmd)) {
System.out.println(getmerge);
} else if ("copyToLocal".equals(cmd)) {
System.out.println(copyToLocal);
} else if ("moveToLocal".equals(cmd)) {
System.out.println(moveToLocal);
} else if ("cat".equals(cmd)) {
System.out.println(cat);
} else if ("get".equals(cmd)) {
System.out.println(get);
} else if ("setrep".equals(cmd)) {
System.out.println(setrep);
} else if ("touchz".equals(cmd)) {
System.out.println(touchz);
} else if ("touch".equals(cmd)) {
System.out.println(touch);
} else if ("test".equals(cmd)) {
System.out.println(test);
} else if ("text".equals(cmd)) {
System.out.println(text);
} else if ("decompress".equals(cmd)) {
System.out.println(decompress);
} else if ("compress".equals(cmd)) {
System.out.println(compress);
} else if ("stat".equals(cmd)) {
System.out.println(stat);
} else if ("tail".equals(cmd)) {
System.out.println(tail);
} else if ("head".equals(cmd)) {
System.out.println(head);
} else if ("chmod".equals(cmd)) {
System.out.println(chmod);
} else if ("chown".equals(cmd)) {
System.out.println(chown);
} else if ("chgrp".equals(cmd)) {
System.out.println(chgrp);
} else if ("undelete".equals(cmd)) {
System.out.println(undelete);
} else if (Count.matches(cmd)) {
System.out.println(Count.DESCRIPTION);
} else if ("help".equals(cmd)) {
System.out.println(help);
} else {
System.out.println(summary);
System.out.println(fs);
System.out.println(ls);
System.out.println(lsr);
System.out.println(lsrx);
System.out.println(du);
System.out.println(dus);
System.out.println(mv);
System.out.println(cp);
System.out.println(rm);
System.out.println(rmr);
System.out.println(rmdir);
System.out.println(put);
System.out.println(copyFromLocal);
System.out.println(moveFromLocal);
System.out.println(get);
System.out.println(getmerge);
System.out.println(cat);
System.out.println(copyToLocal);
System.out.println(moveToLocal);
System.out.println(mkdir);
System.out.println(setrep);
System.out.println(head);
System.out.println(tail);
System.out.println(touchz);
System.out.println(touch);
System.out.println(test);
System.out.println(text);
System.out.println(decompress);
System.out.println(undelete);
System.out.println(compress);
System.out.println(stat);
System.out.println(chmod);
System.out.println(chown);
System.out.println(chgrp);
System.out.println(Count.DESCRIPTION);
System.out.println(help);
}
}
/**
* Apply operation specified by 'cmd' on all parameters
* starting from argv[startindex].
*/
private int doall(String cmd, String argv[], int startindex) {
int exitCode = 0;
int i = startindex;
boolean rmSkipTrash = false;
boolean rmdirIgnoreFail = false;
// Check for -skipTrash option in rm/rmr
if(("-rm".equals(cmd) || "-rmr".equals(cmd))
&& "-skipTrash".equals(argv[i])) {
rmSkipTrash = true;
i++;
}
if ("-rmdir".equals(cmd) && "-ignore-fail-on-non-empty".equals(argv[i])) {
rmdirIgnoreFail = true;
i++;
}
//
// for each source file, issue the command
//
for (; i < argv.length; i++) {
try {
//
// issue the command to the fs
//
if ("-cat".equals(cmd)) {
cat(argv[i], true, false);
} else if ("-mkdir".equals(cmd)) {
mkdir(argv[i]);
} else if ("-rm".equals(cmd)) {
delete(argv[i], false, rmSkipTrash);
} else if ("-rmr".equals(cmd)) {
delete(argv[i], true, rmSkipTrash);
} else if ("-rmdir".equals(cmd)) {
rmdir(argv[i], rmdirIgnoreFail, rmSkipTrash);
} else if ("-du".equals(cmd)) {
du(argv[i]);
} else if ("-dus".equals(cmd)) {
dus(argv[i]);
} else if (Count.matches(cmd)) {
new Count(argv, i, getConf()).runAll();
} else if ("-ls".equals(cmd)) {
exitCode = ls(argv[i], EnumSet.noneOf(LsOption.class));
} else if ("-lsr".equals(cmd)) {
exitCode = ls(argv[i], EnumSet.of(LsOption.Recursive));
} else if ("-lsrx".equals(cmd)) {
exitCode = ls(argv[i],
EnumSet.of(LsOption.Recursive, LsOption.WithBlockSize));
} else if ("-touchz".equals(cmd)) {
touchz(argv[i]);
} else if ("-text".equals(cmd)) {
text(argv[i]);
} else if ("-decompress".equals(cmd)) {
decompress(argv[i]);
} else if ("-undelete".equals(cmd)) {
String userName = null;
if ("-u".equals(argv[i])) {
// make sure there's at least one file path specified
if (argv.length < i+1) {
printUsage(cmd);
return -1;
}
i++;
userName = argv[i++];
}
exitCode = undelete(argv[i], getFS(), userName) ? 0 : -1;
}
} catch (RemoteException e) {
//
// This is a error returned by hadoop server. Print
// out the first line of the error message.
//
exitCode = -1;
try {
String[] content;
content = e.getLocalizedMessage().split("\n");
System.err.println(cmd.substring(1) + ": " +
content[0]);
} catch (Exception ex) {
System.err.println(cmd.substring(1) + ": " +
ex.getLocalizedMessage());
}
} catch (IOException e) {
//
// IO exception encountered locally.
//
exitCode = -1;
String content = e.getLocalizedMessage();
if (content != null) {
content = content.split("\n")[0];
}
System.err.println(cmd.substring(1) + ": " +
content);
}
}
return exitCode;
}
/**
* Displays format of commands.
*
*/
private static void printUsage(String cmd) {
String prefix = "Usage: java " + FsShell.class.getSimpleName();
if ("-fs".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [-fs <local | file system URI>]");
} else if ("-conf".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [-conf <configuration file>]");
} else if ("-D".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [-D <[property=value>]");
} else if ("-ls".equals(cmd) || "-lsr".equals(cmd) || "-lsrx".equals(cmd) ||
"-du".equals(cmd) || "-dus".equals(cmd) ||
"-touchz".equals(cmd) || "-mkdir".equals(cmd) ||
"-text".equals(cmd) || "-decompress".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [" + cmd + " <path>]");
} else if (Count.matches(cmd)) {
System.err.println(prefix + " [" + Count.USAGE + "]");
} else if ("-rm".equals(cmd) || "-rmr".equals(cmd)) {
System.err.println("Usage: java FsShell [" + cmd +
" [-skipTrash] <src>]");
} else if ("-rmdir".equals(cmd)) {
System.err.println("Usage: java FsShell [" + cmd +
" [-ignore-fail-on-non-empty] <src>]");
} else if ("-mv".equals(cmd) || "-cp".equals(cmd) || "-compress".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [" + cmd + " <src> <dst>]");
} else if ("-put".equals(cmd) || "-copyFromLocal".equals(cmd) ||
"-moveFromLocal".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [" + cmd + " <localsrc> ... <dst>]");
} else if ("-get".equals(cmd)) {
System.err.println("Usage: java FsShell [" + GET_SHORT_USAGE + "]");
} else if ("-copyToLocal".equals(cmd)) {
System.err.println("Usage: java FsShell [" + COPYTOLOCAL_SHORT_USAGE+ "]");
} else if ("-moveToLocal".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [" + cmd + " [-crc] <src> <localdst>]");
} else if ("-cat".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [" + cmd + " <src>]");
} else if ("-setrep".equals(cmd)) {
System.err.println("Usage: java FsShell [" + SETREP_SHORT_USAGE + "]");
} else if ("-test".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [-test -[ezd] <path>]");
} else if ("-stat".equals(cmd)) {
System.err.println("Usage: java FsShell" +
" [-stat [format] <path>]");
} else if ("-head".equals(cmd)) {
System.err.println("Usage: java FsShell [" + HEAD_USAGE + "]");
} else if ("-tail".equals(cmd)) {
System.err.println("Usage: java FsShell [" + TAIL_USAGE + "]");
} else if ("-touch".equals(cmd)) {
System.err.println("Usage: java FsShell [" + FsShellTouch.TOUCH_USAGE + "]");
} else {
System.err.println("Usage: java FsShell");
System.err.println(" [-ls <path>]");
System.err.println(" [-lsr <path>]");
System.err.println(" [-lsrx <path>]");
System.err.println(" [-du <path>]");
System.err.println(" [-dus <path>]");
System.err.println(" [" + Count.USAGE + "]");
System.err.println(" [-mv <src> <dst>]");
System.err.println(" [-cp <src> <dst>]");
System.err.println(" [-rm [-skipTrash] <path>]");
System.err.println(" [-rmr [-skipTrash] <path>]");
System.err.println(" [-rmdir [-ignore-fail-on-non-empty] <path>]");
System.err.println(" [-expunge]");
System.err.println(" [-put <localsrc> ... <dst>]");
System.err.println(" [-copyFromLocal <localsrc> ... <dst>]");
System.err.println(" [-moveFromLocal <localsrc> ... <dst>]");
System.err.println(" [" + GET_SHORT_USAGE + "]");
System.err.println(" [-getmerge <src> <localdst> [addnl]]");
System.err.println(" [-cat <src>]");
System.err.println(" [-text <src>]");
System.err.println(" [-decompress <src>]");
System.err.println(" [-compress <src> <tgt>]");
System.err.println(" [-undelete [-u <username>] <src>]");
System.err.println(" [" + COPYTOLOCAL_SHORT_USAGE + "]");
System.err.println(" [-moveToLocal [-crc] <src> <localdst>]");
System.err.println(" [-mkdir <path>]");
System.err.println(" [" + SETREP_SHORT_USAGE + "]");
System.err.println(" [-touchz <path>]");
System.err.println(" [" + FsShellTouch.TOUCH_USAGE + "]");
System.err.println(" [-test -[ezd] <path>]");
System.err.println(" [-stat [format] <path>]");
System.err.println(" [" + HEAD_USAGE + "]");
System.err.println(" [" + TAIL_USAGE + "]");
System.err.println(" [" + FsShellPermissions.CHMOD_USAGE + "]");
System.err.println(" [" + FsShellPermissions.CHOWN_USAGE + "]");
System.err.println(" [" + FsShellPermissions.CHGRP_USAGE + "]");
System.err.println(" [-help [cmd]]");
System.err.println();
ToolRunner.printGenericCommandUsage(System.err);
}
}
/**
* run
*/
public int run(String argv[]) throws Exception {
if (argv.length < 1) {
printUsage("");
return -1;
}
int exitCode = -1;
int i = 0;
String cmd = argv[i++];
//
// verify that we have enough command line parameters
//
if ("-put".equals(cmd) || "-test".equals(cmd) ||
"-copyFromLocal".equals(cmd) || "-moveFromLocal".equals(cmd)) {
if (argv.length < 3) {
printUsage(cmd);
return exitCode;
}
} else if ("-get".equals(cmd) ||
"-copyToLocal".equals(cmd) || "-moveToLocal".equals(cmd)) {
if (argv.length < 3) {
printUsage(cmd);
return exitCode;
}
} else if ("-mv".equals(cmd) || "-cp".equals(cmd) || "-compress".equals(cmd)) {
if (argv.length < 3) {
printUsage(cmd);
return exitCode;
}
} else if ("-rm".equals(cmd) || "-rmr".equals(cmd) ||
"-rmdir".equals(cmd) || "-cat".equals(cmd) ||
"-mkdir".equals(cmd) || "-touchz".equals(cmd) ||
"-stat".equals(cmd) || "-text".equals(cmd) ||
"-decompress".equals(cmd) || "-touch".equals(cmd) ||
"-undelete".equals(cmd)) {
if (argv.length < 2) {
printUsage(cmd);
return exitCode;
}
}
// initialize FsShell
try {
init();
} catch (RPC.VersionMismatch v) {
System.err.println("Version Mismatch between client and server" +
"... command aborted.");
return exitCode;
} catch (IOException e) {
System.err.println("Bad connection to FS. command aborted.");
return exitCode;
}
exitCode = 0;
try {
if ("-put".equals(cmd) || "-copyFromLocal".equals(cmd)) {
Path[] srcs = new Path[argv.length-2];
for (int j=0 ; i < argv.length-1 ;)
srcs[j++] = new Path(argv[i++]);
copyFromLocal(srcs, argv[i++]);
} else if ("-moveFromLocal".equals(cmd)) {
Path[] srcs = new Path[argv.length-2];
for (int j=0 ; i < argv.length-1 ;)
srcs[j++] = new Path(argv[i++]);
moveFromLocal(srcs, argv[i++]);
} else if ("-get".equals(cmd) || "-copyToLocal".equals(cmd)) {
copyToLocal(argv, i);
} else if ("-getmerge".equals(cmd)) {
if (argv.length>i+2)
copyMergeToLocal(argv[i++], new Path(argv[i++]), Boolean.parseBoolean(argv[i++]));
else
copyMergeToLocal(argv[i++], new Path(argv[i++]));
} else if ("-cat".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-text".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-decompress".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-moveToLocal".equals(cmd)) {
moveToLocal(argv[i++], new Path(argv[i++]));
} else if ("-setrep".equals(cmd)) {
setReplication(argv, i);
} else if ("-chmod".equals(cmd) ||
"-chown".equals(cmd) ||
"-chgrp".equals(cmd)) {
FsShellPermissions.changePermissions(getFS(), cmd, argv, i, this);
} else if ("-ls".equals(cmd)) {
if (i < argv.length) {
exitCode = doall(cmd, argv, i);
} else {
exitCode = ls(Path.CUR_DIR, EnumSet.noneOf(LsOption.class));
}
} else if ("-lsr".equals(cmd)) {
if (i < argv.length) {
exitCode = doall(cmd, argv, i);
} else {
exitCode = ls(Path.CUR_DIR, EnumSet.of(LsOption.Recursive));
}
} else if ("-lsrx".equals(cmd)) {
if (i < argv.length) {
exitCode = doall(cmd, argv, i);
} else {
exitCode = ls(Path.CUR_DIR,
EnumSet.of(LsOption.Recursive, LsOption.WithBlockSize));
}
} else if ("-mv".equals(cmd)) {
exitCode = rename(argv, getConf());
} else if ("-cp".equals(cmd)) {
exitCode = copy(argv, getConf());
} else if ("-compress".equals(cmd)) {
exitCode = compress(argv, getConf());
} else if ("-rm".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-rmr".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-rmdir".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-expunge".equals(cmd)) {
expunge();
} else if ("-du".equals(cmd)) {
if (i < argv.length) {
exitCode = doall(cmd, argv, i);
} else {
du(".");
}
} else if ("-dus".equals(cmd)) {
if (i < argv.length) {
exitCode = doall(cmd, argv, i);
} else {
dus(".");
}
} else if (Count.matches(cmd)) {
exitCode = new Count(argv, i, getConf()).runAll();
} else if ("-mkdir".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-undelete".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-touchz".equals(cmd)) {
exitCode = doall(cmd, argv, i);
} else if ("-touch".equals(cmd)) {
FsShellTouch.touchFiles(getFS(), argv, i);
} else if ("-test".equals(cmd)) {
exitCode = test(argv, i);
} else if ("-stat".equals(cmd)) {
if (i + 1 < argv.length) {
stat(argv[i++].toCharArray(), argv[i++]);
} else {
stat("%y".toCharArray(), argv[i]);
}
} else if ("-help".equals(cmd)) {
if (i < argv.length) {
printHelp(argv[i]);
} else {
printHelp("");
}
} else if ("-head".equals(cmd)) {
head(argv, i);
} else if ("-tail".equals(cmd)) {
tail(argv, i);
} else {
exitCode = -1;
System.err.println(cmd.substring(1) + ": Unknown command");
printUsage("");
}
} catch (IllegalArgumentException arge) {
exitCode = -1;
System.err.println(cmd.substring(1) + ": " + arge.getLocalizedMessage());
printUsage(cmd);
} catch (RemoteException e) {
//
// This is a error returned by hadoop server. Print
// out the first line of the error mesage, ignore the stack trace.
exitCode = -1;
try {
String[] content;
content = e.getLocalizedMessage().split("\n");
System.err.println(cmd.substring(1) + ": " +
content[0]);
} catch (Exception ex) {
System.err.println(cmd.substring(1) + ": " +
ex.getLocalizedMessage());
}
} catch (IOException e) {
//
// IO exception encountered locally.
//
exitCode = -1;
System.err.println(cmd.substring(1) + ": " +
e.getLocalizedMessage());
} catch (Exception re) {
exitCode = -1;
System.err.println(cmd.substring(1) + ": " + re.getLocalizedMessage());
} finally {
}
return exitCode;
}
public void close() throws IOException {
if (fs != null) {
fs.close();
fs = null;
}
}
/**
* main() has some simple utility methods
*/
public static void main(String argv[]) throws Exception {
FsShell shell = new FsShell();
int res;
try {
res = ToolRunner.run(shell, argv);
} finally {
shell.close();
}
System.exit(res);
}
/**
* Accumulate exceptions if there is any. Throw them at last.
*/
private abstract class DelayedExceptionThrowing {
abstract void process(Path p, FileSystem srcFs) throws IOException;
final void globAndProcess(Path srcPattern, FileSystem srcFs
) throws IOException {
List<IOException> exceptions = new ArrayList<IOException>();
for(Path p : FileUtil.stat2Paths(srcFs.globStatus(srcPattern),
srcPattern))
try { process(p, srcFs); }
catch(IOException ioe) { exceptions.add(ioe); }
if (!exceptions.isEmpty())
if (exceptions.size() == 1)
throw exceptions.get(0);
else
throw new IOException("Multiple IOExceptions: " + exceptions);
}
}
}
