Initial support for rocket

pom.xml

@@ -112,6 +112,12 @@
   </profiles>
 
   <dependencies>
+    <dependency>
+      <groupId>com.coreos</groupId>
+      <artifactId>appc</artifactId>
+      <version>0.1.0-SNAPSHOT</version>
+    </dependency>
+
     <dependency>
       <groupId>com.spotify</groupId>
       <artifactId>docker-client</artifactId>

src/main/java/com/coreos/appc/docker/DockerContainerBuilder.java

@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2015 CoreOS Inc.
+ *
+ * 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.coreos.appc.docker;
+
+import static com.google.common.base.CharMatcher.WHITESPACE;
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+import java.nio.file.attribute.FileTime;
+import java.util.Collections;
+import java.util.List;
+
+import com.coreos.appc.ContainerBuilder;
+import com.coreos.appc.ContainerFile;
+import com.google.common.base.Joiner;
+import com.google.common.base.Splitter;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Ordering;
+import com.spotify.docker.client.AnsiProgressHandler;
+import com.spotify.docker.client.DockerClient;
+
+public class DockerContainerBuilder extends ContainerBuilder {
+  final DockerClient docker;
+  final String dockerBuildDir;
+  final List<String> addFiles = Lists.newArrayList();
+
+  /**
+   * Set to override the auto-generated dockerfile
+   */
+  public Path dockerfile;
+
+  public DockerContainerBuilder(DockerClient docker, String dockerBuildDir) {
+    this.docker = docker;
+    this.dockerBuildDir = dockerBuildDir;
+  }
+
+  private void createDockerFile() throws IOException {
+    final List<String> commands = Lists.newArrayList();
+    if (baseImage != null) {
+      commands.add("FROM " + baseImage);
+    }
+    if (maintainer != null) {
+      commands.add("MAINTAINER " + maintainer);
+    }
+    if (entryPoint != null) {
+      commands.add("ENTRYPOINT " + entryPoint);
+    }
+    if (cmd != null) {
+      // TODO(dano): we actually need to check whether the base image has an entrypoint
+      if (entryPoint != null) {
+        // CMD needs to be a list of arguments if ENTRYPOINT is set.
+        if (cmd.startsWith("[") && cmd.endsWith("]")) {
+          // cmd seems to be an argument list, so we're good
+          commands.add("CMD " + cmd);
+        } else {
+          // cmd does not seem to be an argument list, so try to generate one.
+          final List<String> args = ImmutableList.copyOf(
+              Splitter.on(WHITESPACE).omitEmptyStrings().split(cmd));
+          final StringBuilder cmdBuilder = new StringBuilder("[");
+          for (String arg : args) {
+            cmdBuilder.append('"').append(arg).append('"');
+          }
+          cmdBuilder.append(']');
+          final String cmdString = cmdBuilder.toString();
+          commands.add("CMD " + cmdString);
+          log.warn("Entrypoint provided but cmd is not an explicit list. Attempting to "
+              + "generate CMD string in the form of an argument list.");
+          log.warn("CMD " + cmdString);
+        }
+      } else {
+        // no ENTRYPOINT set so use cmd verbatim
+        commands.add("CMD " + cmd);
+      }
+    } else {
+      commands.add("CMD []");
+    }
+
+    for (String file : addFiles) {
+      commands.add(String.format("ADD %s %s", file, file));
+    }
+
+    if (env != null) {
+      final List<String> sortedKeys = Ordering.natural().sortedCopy(env.keySet());
+      for (String key : sortedKeys) {
+        final String value = env.get(key);
+        commands.add(String.format("ENV %s %s", key, value));
+      }
+    }
+
+    if (exposesSet != null && exposesSet.size() > 0) {
+      // The values will be sorted with no duplicated since exposesSet is a TreeSet
+      commands.add("EXPOSE " + Joiner.on(" ").join(exposesSet));
+    }
+
+    // this will overwrite an existing file
+    Files.createDirectories(Paths.get(dockerBuildDir));
+    Files.write(Paths.get(dockerBuildDir, "Dockerfile"), commands, UTF_8);
+  }
+
+  @Override
+  public void addFiles(List<ContainerFile> containerFiles) throws IOException {
+    List<String> copiedPaths = Lists.newArrayList();
+
+    for (ContainerFile containerFile : containerFiles) {
+      final Path sourcePath = containerFile.sourcePath;
+
+      final Path destPath = Paths.get(dockerBuildDir, containerFile.imagePath);
+      log.info(String.format("Copying %s -> %s", sourcePath, destPath));
+      // ensure all directories exist because copy operation will fail if they don't
+      Files.createDirectories(destPath.getParent());
+      Files.copy(sourcePath, destPath, StandardCopyOption.REPLACE_EXISTING);
+      Files.setLastModifiedTime(destPath, FileTime.fromMillis(0));
+      // file location relative to docker directory, used later to generate Dockerfile
+      final Path relativePath = Paths.get(containerFile.imagePath);
+      copiedPaths.add(relativePath.toString());
+    }
+
+    // The list of included files returned from DirectoryScanner can be in a different order
+    // each time. This causes the ADD statements in the generated Dockerfile to appear in a
+    // different order. We want to avoid this so each run of the plugin always generates the same
+    // Dockerfile, which also makes testing easier. Sort the list of paths for each resource
+    // before adding it to the allCopiedPaths list. This way we follow the ordering of the
+    // resources in the pom, while making sure all the paths of each resource are always in the
+    // same order.
+    Collections.sort(copiedPaths);
+    addFiles.addAll(copiedPaths);
+  }
+
+  public void buildImage(String imageName) throws Exception {
+    if (dockerfile == null) {
+      createDockerFile();
+    }
+
+    log.info("Building image " + imageName);
+    docker.build(Paths.get(dockerBuildDir), imageName, new AnsiProgressHandler());
+    log.info("Built " + imageName);
+  }
+
+}