FileUtil { 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; } return srcUri.getPort()==dstUri.getPort(); }  static Path[] stat2Paths(FileStatus[] stats); static Path[] stat2Paths(FileStatus[] stats, Path path); static void fullyDeleteOnExit(final File file); static boolean fullyDelete(final File dir); static boolean fullyDelete(final File dir, boolean tryGrantPermissions); static String readLink(File f); static boolean fullyDeleteContents(final File dir); static boolean fullyDeleteContents(final File dir, final boolean tryGrantPermissions); @Deprecated static void fullyDelete(FileSystem fs, Path dir); static boolean copy(FileSystem srcFS, Path src,
                             FileSystem dstFS, Path dst,
                             boolean deleteSource,
                             Configuration conf); static boolean copy(FileSystem srcFS, Path[] srcs,
                             FileSystem dstFS, Path dst,
                             boolean deleteSource,
                             boolean overwrite, Configuration conf); static boolean copy(FileSystem srcFS, Path src,
                             FileSystem dstFS, Path dst,
                             boolean deleteSource,
                             boolean overwrite,
                             Configuration conf); static boolean copy(FileSystem srcFS, FileStatus srcStatus,
                             FileSystem dstFS, Path dst,
                             boolean deleteSource,
                             boolean overwrite,
                             Configuration conf); static boolean copy(File src,
                             FileSystem dstFS, Path dst,
                             boolean deleteSource,
                             Configuration conf); static boolean copy(FileSystem srcFS, Path src,
                             File dst, boolean deleteSource,
                             Configuration conf); static String makeShellPath(String filename); static String makeShellPath(File file); static String makeSecureShellPath(File file); static String makeShellPath(File file, boolean makeCanonicalPath); static long getDU(File dir); static void unZip(InputStream inputStream, File toDir); static void unZip(File inFile, File unzipDir); static void unTar(InputStream inputStream, File untarDir,
                           boolean gzipped); static void unTar(File inFile, File untarDir); static int symLink(String target, String linkname); static int chmod(String filename, String perm
                          ); static int chmod(String filename, String perm, boolean recursive); static void setOwner(File file, String username,
      String groupname); static boolean setReadable(File f, boolean readable); static boolean setWritable(File f, boolean writable); static boolean setExecutable(File f, boolean executable); static boolean canRead(File f); static boolean canWrite(File f); static boolean canExecute(File f); static void setPermission(File f, FsPermission permission
                                   ); static final File createLocalTempFile(final File basefile,
                                               final String prefix,
                                               final boolean isDeleteOnExit); static void replaceFile(File src, File target); static File[] listFiles(File dir); static String[] list(File dir); static String[] createJarWithClassPath(String inputClassPath, Path pwd,
      Map<String, String> callerEnv); static String[] createJarWithClassPath(String inputClassPath, Path pwd,
      Path targetDir,
      Map<String, String> callerEnv); static List<Path> getJarsInDirectory(String path); static List<Path> getJarsInDirectory(String path, boolean useLocal); static boolean compareFs(FileSystem srcFs, FileSystem destFs); static FileSystem write(final FileSystem fs, final Path path,
      final byte[] bytes); static FileContext write(final FileContext fileContext,
      final Path path, final byte[] bytes); static FileSystem write(final FileSystem fs, final Path path,
      final Iterable<? extends CharSequence> lines, final Charset cs); static FileContext write(final FileContext fileContext,
      final Path path, final Iterable<? extends CharSequence> lines,
      final Charset cs); static FileSystem write(final FileSystem fs, final Path path,
      final CharSequence charseq, final Charset cs); static FileContext write(final FileContext fs, final Path path,
      final CharSequence charseq, final Charset cs); static FileSystem write(final FileSystem fs, final Path path,
      final CharSequence charseq); static FileContext write(final FileContext fileContext,
      final Path path, final CharSequence charseq); static final int SYMLINK_NO_PRIVILEGE; }
@Test public void testCompareFsNull() throws Exception { setupCompareFs(); assertEquals(FileUtil.compareFs(null,fs1),false); assertEquals(FileUtil.compareFs(fs1,null),false); }
@Test public void testCompareFsDirectories() throws Exception { setupCompareFs(); assertEquals(FileUtil.compareFs(fs1,fs1),true); assertEquals(FileUtil.compareFs(fs1,fs2),false); assertEquals(FileUtil.compareFs(fs1,fs5),false); assertEquals(FileUtil.compareFs(fs3,fs4),true); assertEquals(FileUtil.compareFs(fs1,fs6),false); }