linstor: move getHostname() to kvm/Pool and reimplement

Author: rp-

plugins/storage/volume/linstor/src/main/java/com/cloud/hypervisor/kvm/storage/LinstorStorageAdaptor.java

@@ -16,27 +16,23 @@
 // under the License.
 package com.cloud.hypervisor.kvm.storage;
 
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
-import java.util.StringJoiner;
 
 import javax.annotation.Nonnull;
 
+import com.cloud.storage.Storage;
+import com.cloud.utils.exception.CloudRuntimeException;
 import org.apache.cloudstack.storage.datastore.util.LinstorUtil;
 import org.apache.cloudstack.utils.qemu.QemuImg;
 import org.apache.cloudstack.utils.qemu.QemuImgException;
 import org.apache.cloudstack.utils.qemu.QemuImgFile;
 import org.apache.log4j.Logger;
 import org.libvirt.LibvirtException;
 
-import com.cloud.storage.Storage;
-import com.cloud.utils.exception.CloudRuntimeException;
 import com.linbit.linstor.api.ApiClient;
 import com.linbit.linstor.api.ApiException;
 import com.linbit.linstor.api.Configuration;
@@ -73,28 +69,6 @@ private static String getLinstorRscName(String name) {
         return LinstorUtil.RSC_PREFIX + name;
     }
 
-    private String getHostname() {
-        // either there is already some function for that in the agent or a better way.
-        ProcessBuilder pb = new ProcessBuilder("/usr/bin/hostname");
-        try
-        {
-            String result;
-            Process p = pb.start();
-            final BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
-
-            StringJoiner sj = new StringJoiner(System.getProperty("line.separator"));
-            reader.lines().iterator().forEachRemaining(sj::add);
-            result = sj.toString();
-
-            p.waitFor();
-            p.destroy();
-            return result.trim();
-        } catch (IOException | InterruptedException exc) {
-            Thread.currentThread().interrupt();
-            throw new CloudRuntimeException("Unable to run '/usr/bin/hostname' command.");
-        }
-    }
-
     private void logLinstorAnswer(@Nonnull ApiCallRc answer) {
         if (answer.isError()) {
             s_logger.error(answer.getMessage());
@@ -125,7 +99,7 @@ private void handleLinstorApiAnswers(ApiCallRcList answers, String excMessage) {
     }
 
     public LinstorStorageAdaptor() {
-        localNodeName = getHostname();
+        localNodeName = LinstorStoragePool.getHostname();
     }
 
     @Override

plugins/storage/volume/linstor/src/main/java/com/cloud/hypervisor/kvm/storage/LinstorStoragePool.java

@@ -25,8 +25,13 @@
 import com.cloud.agent.api.to.HostTO;
 import com.cloud.hypervisor.kvm.resource.KVMHABase.HAStoragePool;
 import com.cloud.storage.Storage;
+import com.cloud.utils.exception.CloudRuntimeException;
+import com.cloud.utils.script.OutputInterpreter;
+import com.cloud.utils.script.Script;
+import org.apache.log4j.Logger;
 
 public class LinstorStoragePool implements KVMStoragePool {
+    private static final Logger s_logger = Logger.getLogger(LinstorStoragePool.class);
     private final String _uuid;
     private final String _sourceHost;
     private final int _sourcePort;
@@ -219,6 +224,17 @@ public String getStorageNodeId() {
         return null;
     }
 
+    static String getHostname() {
+        OutputInterpreter.AllLinesParser parser = new OutputInterpreter.AllLinesParser();
+        Script sc = new Script("hostname", Duration.millis(10000L), s_logger);
+        String res = sc.execute(parser);
+        if (res != null) {
+            throw new CloudRuntimeException(String.format("Unable to run 'hostname' command: %s", res));
+        }
+        String response = parser.getLines();
+        return response.trim();
+    }
+
     @Override
     public Boolean checkingHeartBeat(HAStoragePool pool, HostTO host) {
         return null;