[CLOUDSTACK-10240] ACS cannot migrate a volume from local to shared storage

CloudStack is logically restricting the migration of local storages to shared storage and vice versa. This restriction is a logical one and can be removed for XenServer deployments. Therefore, we will enable migration of volumes between local-shared storages in XenServers independently of their service offering. This will work as an override mechanism to the disk offering used by volumes. If administrators want to migrate local volumes to a shared storage, they should be able to do so (the hypervisor already allows that). The same the other way around.

Author: rafaelweingartner

api/src/main/java/org/apache/cloudstack/api/command/admin/storage/FindStoragePoolsForMigrationCmd.java

@@ -17,10 +17,10 @@
 package org.apache.cloudstack.api.command.admin.storage;
 
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
 import java.util.List;
 
-import org.apache.log4j.Logger;
-
 import org.apache.cloudstack.api.APICommand;
 import org.apache.cloudstack.api.ApiCommandJobType;
 import org.apache.cloudstack.api.ApiConstants;
@@ -29,12 +29,12 @@
 import org.apache.cloudstack.api.response.ListResponse;
 import org.apache.cloudstack.api.response.StoragePoolResponse;
 import org.apache.cloudstack.api.response.VolumeResponse;
+import org.apache.log4j.Logger;
 
 import com.cloud.storage.StoragePool;
 import com.cloud.utils.Pair;
 
-@APICommand(name = "findStoragePoolsForMigration", description = "Lists storage pools available for migration of a volume.", responseObject = StoragePoolResponse.class,
-        requestHasSensitiveInfo = false, responseHasSensitiveInfo = false)
+@APICommand(name = "findStoragePoolsForMigration", description = "Lists storage pools available for migration of a volume.", responseObject = StoragePoolResponse.class, requestHasSensitiveInfo = false, responseHasSensitiveInfo = false)
 public class FindStoragePoolsForMigrationCmd extends BaseListCmd {
     public static final Logger s_logger = Logger.getLogger(FindStoragePoolsForMigrationCmd.class.getName());
 
@@ -86,6 +86,7 @@ public void execute() {
                     break;
                 }
             }
+            sortPoolsBySuitability(poolResponses);
             poolResponse.setSuitableForMigration(suitableForMigration);
             poolResponse.setObjectName("storagepool");
             poolResponses.add(poolResponse);
@@ -95,4 +96,22 @@ public void execute() {
         response.setResponseName(getCommandName());
         this.setResponseObject(response);
     }
+
+    protected void sortPoolsBySuitability(List<StoragePoolResponse> poolResponses) {
+        Collections.sort(poolResponses, new Comparator<StoragePoolResponse>() {
+            @Override
+            public int compare(StoragePoolResponse o1, StoragePoolResponse o2) {
+                if (o1.getSuitableForMigration() && o2.getSuitableForMigration()) {
+                    return o1.getName().compareTo(o2.getName());
+                }
+                if (o1.getSuitableForMigration()) {
+                    return -1;
+                }
+                if (o2.getSuitableForMigration()) {
+                    return 1;
+                }
+                return 0;
+            }
+        });
+    }
 }

api/src/test/java/org/apache/cloudstack/api/command/admin/storage/FindStoragePoolsForMigrationCmdTest.java

@@ -0,0 +1,63 @@
+// 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.cloudstack.api.command.admin.storage;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.cloudstack.api.response.StoragePoolResponse;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.runners.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)
+public class FindStoragePoolsForMigrationCmdTest {
+
+    private FindStoragePoolsForMigrationCmd findStoragePoolsForMigrationCmd = new FindStoragePoolsForMigrationCmd();
+
+    @Test
+    public void sortPoolsBySuitability() {
+        List<StoragePoolResponse> storagePoolsResponse = new ArrayList<>();
+        StoragePoolResponse storagePoolResponse1 = new StoragePoolResponse();
+        storagePoolResponse1.setSuitableForMigration(true);
+        storagePoolResponse1.setId("1");
+        storagePoolResponse1.setName("1");
+
+        StoragePoolResponse storagePoolResponse2 = new StoragePoolResponse();
+        storagePoolResponse2.setSuitableForMigration(false);
+        storagePoolResponse2.setId("2");
+        storagePoolResponse2.setName("2");
+
+        StoragePoolResponse storagePoolResponse3 = new StoragePoolResponse();
+        storagePoolResponse3.setSuitableForMigration(true);
+        storagePoolResponse3.setId("3");
+        storagePoolResponse3.setName("3");
+
+        storagePoolsResponse.add(storagePoolResponse3);
+        storagePoolsResponse.add(storagePoolResponse2);
+        storagePoolsResponse.add(storagePoolResponse1);
+
+        findStoragePoolsForMigrationCmd.sortPoolsBySuitability(storagePoolsResponse);
+
+        Assert.assertEquals("1", storagePoolsResponse.get(0).getId());
+        Assert.assertEquals("3", storagePoolsResponse.get(1).getId());
+        Assert.assertEquals("2", storagePoolsResponse.get(2).getId());
+
+    }
+
+}