content: // 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 com.cloud.hypervisor.kvm.resource.wrapper;
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.PatchSystemVmAnswer;
  import com.cloud.agent.api.PatchSystemVmCommand;
  import com.cloud.agent.api.routing.NetworkElementCommand;
  import com.cloud.agent.resource.virtualnetwork.VRScripts;
  import com.cloud.hypervisor.kvm.resource.LibvirtComputingResource;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  import com.cloud.utils.ExecutionResult;
  import com.cloud.utils.FileUtil;
  import com.cloud.utils.Pair;
  import com.cloud.utils.exception.CloudRuntimeException;
  import com.cloud.utils.ssh.SshHelper;
  import com.cloud.utils.validation.ChecksumUtil;
  import org.apache.commons.lang3.StringUtils;
  
  import java.io.File;
  
  @ResourceWrapper(handles = PatchSystemVmCommand.class)
  public class LibvirtPatchSystemVmCommandWrapper extends CommandWrapper<PatchSystemVmCommand, Answer, LibvirtComputingResource> {
      private static int sshPort = Integer.parseInt(LibvirtComputingResource.DEFAULTDOMRSSHPORT);
      private static File pemFile = new File(LibvirtComputingResource.SSHPRVKEYPATH);
  
      @Override
      public Answer execute(PatchSystemVmCommand cmd, LibvirtComputingResource serverResource) {
          final String controlIp = cmd.getAccessDetail(NetworkElementCommand.ROUTER_IP);
          final String sysVMName = cmd.getAccessDetail(NetworkElementCommand.ROUTER_NAME);
          ExecutionResult result;
          try {
              result = getSystemVmVersionAndChecksum(serverResource, controlIp);
          } catch (CloudRuntimeException e) {
              return new PatchSystemVmAnswer(cmd, e.getMessage());
          }
  
          final String[] lines = result.getDetails().split("&");
          // TODO: do we fail, or patch anyway??
          if (lines.length != 2) {
              return new PatchSystemVmAnswer(cmd, result.getDetails());
          }
  
          String scriptChecksum = lines[1].trim();
          String checksum = ChecksumUtil.calculateCurrentChecksum(sysVMName, "vms/cloud-scripts.tgz").trim();
  
          if (!StringUtils.isEmpty(checksum) && checksum.equals(scriptChecksum) && !cmd.isForced()) {
              String msg = String.format("No change in the scripts checksum, not patching systemVM %s", sysVMName);
              logger.info(msg);
              return new PatchSystemVmAnswer(cmd, msg, lines[0], lines[1]);
          }
  
          Pair<Boolean, String> patchResult = null;
          try {
              FileUtil.scpPatchFiles(controlIp, VRScripts.CONFIG_CACHE_LOCATION, sshPort, pemFile, serverResource.systemVmPatchFiles, LibvirtComputingResource.BASEPATH);
              patchResult = SshHelper.sshExecute(controlIp, sshPort, "root",
                      pemFile, null, "/var/cache/cloud/patch-sysvms.sh", 10000, 10000, 600000);
          } catch (Exception e) {
              return new PatchSystemVmAnswer(cmd, e.getMessage());
          }
  
          if (patchResult.first()) {
              String scriptVersion = lines[1];
              if (StringUtils.isNotEmpty(patchResult.second())) {
                  logger.debug("Patch result of systemVM {}: {}", sysVMName, patchResult.second());
                  String res = patchResult.second().replace("\n", " ");
                  String[] output = res.split(":");
                  if (output.length != 2) {
                      logger.warn("Failed to get the latest script version");
                  } else {
                      scriptVersion = output[1].split(" ")[0];
                  }
              }
              return new PatchSystemVmAnswer(cmd, String.format("Successfully patched systemVM %s ", sysVMName), lines[0], scriptVersion);
          }
          return new PatchSystemVmAnswer(cmd, patchResult.second());
      }
  
      private ExecutionResult getSystemVmVersionAndChecksum(LibvirtComputingResource serverResource, String controlIp) {
          ExecutionResult result;
          try {
              result = serverResource.executeInVR(controlIp, VRScripts.VERSION, null);
              if (!result.isSuccess()) {
                  String errMsg = String.format("GetSystemVMVersionCmd on %s failed, message %s", controlIp, result.getDetails());
                  logger.error(errMsg);
                  throw new CloudRuntimeException(errMsg);
              }
          } catch (final Exception e) {
              final String msg = "GetSystemVMVersionCmd failed due to " + e;
              logger.error(msg, e);
              throw new CloudRuntimeException(msg, e);
          }
          return result;
      }
  }
  