HADOOP-15150. in FsShell, UGI params should be overidden through env vars(-D arg). Contributed by Brahma Reddy Battula.

(cherry picked from commit 08332e12d055d85472f0c9371fefe9b56bfea1ed)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FsShell.java

@@ -32,6 +32,7 @@ import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.fs.shell.Command;
 import org.apache.hadoop.fs.shell.CommandFactory;
 import org.apache.hadoop.fs.shell.FsCommand;
+import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.tools.TableListing;
 import org.apache.hadoop.tracing.TraceUtils;
 import org.apache.hadoop.util.StringUtils;
@@ -92,6 +93,7 @@ public class FsShell extends Configured implements Tool {
   
   protected void init() throws IOException {
     getConf().setQuietMode(true);
+    UserGroupInformation.setConfiguration(getConf());
     if (commandFactory == null) {
       commandFactory = new CommandFactory(getConf());
       commandFactory.addObject(new Help(), "-help");

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestFsShellList.java

@@ -75,4 +75,18 @@ public class TestFsShellList {
     lsArgv = new String[]{"-ls", "-q", testRootDir.toString()};
     assertThat(shell.run(lsArgv), is(0));
   }
+
+  /*
+  UGI params should take effect when we pass.
+ */
+  @Test(expected = IllegalArgumentException.class)
+  public void testListWithUGI() throws Exception {
+    FsShell fsShell = new FsShell(new Configuration());
+    //Passing Dummy such that it should through IAE
+    fsShell.getConf()
+        .set(CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHENTICATION,
+            "DUMMYAUTH");
+    String[] lsArgv = new String[] {"-ls", testRootDir.toString()};
+    fsShell.run(lsArgv);
+  }
 }