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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.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.StringTokenizer;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.util.Shell;
import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
/**
* Wrapper for the Unix stat(1) command. Used to workaround the lack of
* lstat(2) in Java 6.
*/
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
@InterfaceStability.Evolving
public class Stat extends Shell {
private final Path original;
private final Path qualified;
private final Path path;
private final long blockSize;
private final boolean dereference;
private FileStatus stat;
public Stat(Path path, long blockSize, boolean deref, FileSystem fs)
throws IOException {
super(0L, true);
// Original path
this.original = path;
// Qualify the original and strip out URI fragment via toUri().getPath()
Path stripped = new Path(
original.makeQualified(fs.getUri(), fs.getWorkingDirectory())
.toUri().getPath());
// Re-qualify the bare stripped path and store it
this.qualified =
stripped.makeQualified(fs.getUri(), fs.getWorkingDirectory());
// Strip back down to a plain path
this.path = new Path(qualified.toUri().getPath());
this.blockSize = blockSize;
this.dereference = deref;
// LANG = C setting
Map env = new HashMap();
env.put("LANG", "C");
setEnvironment(env);
}
public FileStatus getFileStatus() throws IOException {
run();
return stat;
}
/**
* Whether Stat is supported on the current platform
* @return
*/
public static boolean isAvailable() {
if (Shell.LINUX || Shell.FREEBSD || Shell.MAC) {
return true;
}
return false;
}
@VisibleForTesting
FileStatus getFileStatusForTesting() {
return stat;
}
@Override
protected String[] getExecString() {
String derefFlag = "-";
if (dereference) {
derefFlag = "-L";
}
if (Shell.LINUX) {
return new String[] {
"stat", derefFlag + "c", "%s,%F,%Y,%X,%a,%U,%G,%N", path.toString() };
} else if (Shell.FREEBSD || Shell.MAC) {
return new String[] {
"stat", derefFlag + "f", "%z,%HT,%m,%a,%Op,%Su,%Sg,`link' -> `%Y'",
path.toString() };
} else {
throw new UnsupportedOperationException(
"stat is not supported on this platform");
}
}
@Override
protected void parseExecResult(BufferedReader lines) throws IOException {
// Reset stat
stat = null;
String line = lines.readLine();
if (line == null) {
throw new IOException("Unable to stat path: " + original);
}
if (line.endsWith("No such file or directory") ||
line.endsWith("Not a directory")) {
throw new FileNotFoundException("File " + original + " does not exist");
}
if (line.endsWith("Too many levels of symbolic links")) {
throw new IOException("Possible cyclic loop while following symbolic" +
" link " + original);
}
// 6,symbolic link,6,1373584236,1373584236,lrwxrwxrwx,andrew,andrew,`link' -> `target'
// OR
// 6,symbolic link,6,1373584236,1373584236,lrwxrwxrwx,andrew,andrew,'link' -> 'target'
StringTokenizer tokens = new StringTokenizer(line, ",");
try {
long length = Long.parseLong(tokens.nextToken());
boolean isDir = tokens.nextToken().equalsIgnoreCase("directory") ? true
: false;
// Convert from seconds to milliseconds
long modTime = Long.parseLong(tokens.nextToken())*1000;
long accessTime = Long.parseLong(tokens.nextToken())*1000;
String octalPerms = tokens.nextToken();
// FreeBSD has extra digits beyond 4, truncate them
if (octalPerms.length() > 4) {
int len = octalPerms.length();
octalPerms = octalPerms.substring(len-4, len);
}
FsPermission perms = new FsPermission(Short.parseShort(octalPerms, 8));
String owner = tokens.nextToken();
String group = tokens.nextToken();
String symStr = tokens.nextToken();
// 'notalink'
// `link' -> `target' OR 'link' -> 'target'
// '' -> ''
Path symlink = null;
String parts[] = symStr.split(" -> ");
try {
String target = parts[1];
target = target.substring(1, target.length()-1);
if (!target.isEmpty()) {
symlink = new Path(target);
}
} catch (ArrayIndexOutOfBoundsException e) {
// null if not a symlink
}
// Set stat
stat = new FileStatus(length, isDir, 1, blockSize, modTime, accessTime,
perms, owner, group, symlink, qualified);
} catch (NumberFormatException e) {
throw new IOException("Unexpected stat output: " + line, e);
} catch (NoSuchElementException e) {
throw new IOException("Unexpected stat output: " + line, e);
}
}
}
