YARN-5443. Add support for docker inspect command. Contributed by Shane Kumpf.
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/DockerInspectCommand.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/DockerInspectCommand.java
new file mode 100644
index 0000000..94b87b7
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/DockerInspectCommand.java
@@ -0,0 +1,41 @@
+/*
+ * *
+ * 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.yarn.server.nodemanager.containermanager.linux.runtime.docker;
+
+/**
+ * Encapsulates the docker inspect command and its command
+ * line arguments.
+ */
+public class DockerInspectCommand extends DockerCommand {
+ private static final String INSPECT_COMMAND = "inspect";
+ private String containerName;
+
+ public DockerInspectCommand(String containerName) {
+ super(INSPECT_COMMAND);
+ this.containerName = containerName;
+ }
+
+ public DockerInspectCommand getContainerStatus() {
+ super.addCommandArguments("--format='{{.State.Status}}'");
+ super.addCommandArguments(containerName);
+ return this;
+ }
+}
\ No newline at end of file
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/TestDockerInspectCommand.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/TestDockerInspectCommand.java
new file mode 100644
index 0000000..3321364
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/runtime/docker/TestDockerInspectCommand.java
@@ -0,0 +1,50 @@
+/*
+ * 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.yarn.server.nodemanager.containermanager.linux.runtime.docker;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Tests the docker inspect command and its command
+ * line arguments.
+ */
+public class TestDockerInspectCommand {
+
+ private DockerInspectCommand dockerInspectCommand;
+
+ private static final String CONTAINER_NAME = "foo";
+
+ @Before
+ public void setup() {
+ dockerInspectCommand = new DockerInspectCommand(CONTAINER_NAME);
+ }
+
+ @Test
+ public void testGetCommandOption() {
+ assertEquals("inspect", dockerInspectCommand.getCommandOption());
+ }
+
+ @Test
+ public void testGetContainerStatus() throws Exception {
+ dockerInspectCommand.getContainerStatus();
+ assertEquals("inspect --format='{{.State.Status}}' foo",
+ dockerInspectCommand.getCommandWithArguments());
+ }
+}
\ No newline at end of file
