HADOOP-7207. fs member of FSShell is not really needed

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1092519 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -137,6 +137,8 @@ Trunk (unreleased changes)
     HADOOP-7216. Add FsCommand.runAll() with deprecated annotation for the
     transition of Command base class improvement.  (Daryn Sharp via szetszwo)
 
+    HADOOP-7207. fs member of FSShell is not really needed (boryas)
+
 Release 0.22.0 - Unreleased
 
   INCOMPATIBLE CHANGES

src/java/org/apache/hadoop/fs/FsShell.java

@@ -60,7 +60,7 @@ public class FsShell extends Configured implements Tool {
   
   static final Log LOG = LogFactory.getLog(FsShell.class);
 
-  protected FileSystem fs;
+  private FileSystem fs;
   private Trash trash;
   protected CommandFactory commandFactory;
 
@@ -92,14 +92,22 @@ public class FsShell extends Configured implements Tool {
     commandFactory = new CommandFactory();
   }
   
-  protected void init() throws IOException {
+  protected FileSystem getFS() throws IOException {
-    getConf().setQuietMode(true);
+    if(fs == null)
-    if (this.fs == null) {
+      fs = FileSystem.get(getConf());
-     this.fs = FileSystem.get(getConf());
+    
-    }
+    return fs;
+  }
+  
+  protected Trash getTrash() throws IOException {
     if (this.trash == null) {
       this.trash = new Trash(getConf());
     }
+    return this.trash;
+  }
+  
+  protected void init() throws IOException {
+    getConf().setQuietMode(true);
   }
 
   
@@ -510,11 +518,12 @@ public class FsShell extends Configured implements Tool {
       System.out.flush();
 
       boolean printWarning = false;
-      FileStatus status = fs.getFileStatus(f);
+      FileSystem pFS = f.getFileSystem(getConf());
+      FileStatus status = pFS.getFileStatus(f);
       long len = status.getLen();
 
       for(boolean done = false; !done; ) {
-        BlockLocation[] locations = fs.getFileBlockLocations(status, 0, len);
+        BlockLocation[] locations = pFS.getFileBlockLocations(status, 0, len);
         int i = 0;
         for(; i < locations.length && 
           locations[i].getHosts().length == rep; i++)
@@ -1087,7 +1096,8 @@ public class FsShell extends Configured implements Tool {
     //
     if (argv.length > 3) {
       Path dst = new Path(dest);
-      if (!fs.isDirectory(dst)) {
+      FileSystem pFS = dst.getFileSystem(conf);
+      if (!pFS.isDirectory(dst)) {
         throw new IOException("When copying multiple files, " 
                               + "destination " + dest + " should be a directory.");
       }
@@ -1199,15 +1209,15 @@ public class FsShell extends Configured implements Tool {
   }
 
   private void expunge() throws IOException {
-    trash.expunge();
+    getTrash().expunge();
-    trash.checkpoint();
+    getTrash().checkpoint();
   }
 
   /**
    * Returns the Trash object associated with this shell.
    */
-  public Path getCurrentTrashDir() {
+  public Path getCurrentTrashDir() throws IOException {
-    return trash.getCurrentTrashDir();
+    return getTrash().getCurrentTrashDir();
   }
 
   /**

src/test/core/org/apache/hadoop/fs/TestFsShellReturnCode.java

@@ -274,6 +274,37 @@ public class TestFsShellReturnCode {
     }
   }
   
+  @Test
+  public void testInvalidDefautlFS() throws Exception {
+    // if default fs doesn't exist or is invalid, but the path provided in 
+    // arguments is valid - fsshell should work
+    FsShell shell = new FsShell();
+    Configuration conf = new Configuration();
+    FsConfig.setDefaultFS(conf, "hhhh://doesnotexist/");
+    shell.setConf(conf);
+    String [] args = new String[2];
+    args[0] = "-ls";
+    args[1] = "file:///"; // this is valid, so command should run
+    int res = shell.run(args);
+    System.out.println("res =" + res);
+    shell.setConf(conf);
+    final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
+    final PrintStream out = new PrintStream(bytes);
+    final PrintStream oldErr = System.err;
+    System.setErr(out);
+    final String results;
+    try {
+      int run = shell.run(args);
+      results = bytes.toString();
+      LOG.info("result=" + results);
+      assertTrue("Return code should be 0", run == 0);
+    } finally {
+      IOUtils.closeStream(out);
+      System.setErr(oldErr);
+    }
+    
+  }
+  
   static class LocalFileSystemExtn extends RawLocalFileSystem {
 
     private String username;