HBASE-19159 Backup should check permission for snapshot copy in advance (Janos Gub)

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupAdminImpl.java

@@ -558,6 +558,7 @@ public class BackupAdminImpl implements BackupAdmin {
           throw new IOException("Target backup directory " + targetTableBackupDir
               + " exists already.");
         }
+        outputFs.mkdirs(targetTableBackupDirPath);
       }
       ArrayList<TableName> nonExistingTableList = null;
       try (Admin admin = conn.getAdmin();) {

hbase-backup/src/test/java/org/apache/hadoop/hbase/backup/TestBackupSmallTests.java

@@ -0,0 +1,53 @@
+/**
+ * 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.hbase.backup;
+
+import java.io.IOException;
+
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.hbase.testclassification.SmallTests;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+@Category(SmallTests.class)
+public class TestBackupSmallTests extends TestBackupBase {
+  private static final UserGroupInformation DIANA =
+      UserGroupInformation.createUserForTesting("diana", new String[] {});
+  private static final String PERMISSION_TEST_PATH = Path.SEPARATOR + "permissionUT";
+
+  @Test public void testBackupPathIsAccessible() throws Exception {
+    Path path = new Path(PERMISSION_TEST_PATH);
+    FileSystem fs = FileSystem.get(TEST_UTIL.getConnection().getConfiguration());
+    fs.mkdirs(path);
+  }
+
+  @Test(expected = IOException.class) public void testBackupPathIsNotAccessible() throws Exception {
+    Path path = new Path(PERMISSION_TEST_PATH);
+    FileSystem rootFs = FileSystem.get(TEST_UTIL.getConnection().getConfiguration());
+    rootFs.mkdirs(path.getParent());
+    rootFs.setPermission(path.getParent(), FsPermission.createImmutable((short) 000));
+    FileSystem fs =
+        DFSTestUtil.getFileSystemAs(DIANA, TEST_UTIL.getConnection().getConfiguration());
+    fs.mkdirs(path);
+  }
+}