Introduce packaging tests for Docker (elastic#46599)

Closes elastic#37617. Add packaging tests for our Docker images, similar to what
we have for RPMs or Debian packages. This works by running a container and
probing it e.g. via `docker exec`. Test can also be run in Vagrant, by
exporting the Docker images to disk and loading them again in VMs. Docker
is installed via `Vagrantfile` in a selection of boxes.

Vagrantfile

@@ -1,5 +1,5 @@
 # -*- mode: ruby -*-
-# vi: set ft=ruby :
+# vim: ft=ruby ts=2 sw=2 sts=2 et:
 
 # This Vagrantfile exists to test packaging. Read more about its use in the
 # vagrant section in TESTING.asciidoc.
@@ -63,6 +63,7 @@ Vagrant.configure(2) do |config|
         # Install Jayatana so we can work around it being present.
         [ -f /usr/share/java/jayatanaag.jar ] || install jayatana
       SHELL
+      ubuntu_docker config
     end
   end
   'ubuntu-1804'.tap do |box|
@@ -72,6 +73,7 @@ Vagrant.configure(2) do |config|
        # Install Jayatana so we can work around it being present.
        [ -f /usr/share/java/jayatanaag.jar ] || install jayatana
       SHELL
+      ubuntu_docker config
     end
   end
   'debian-8'.tap do |box|
@@ -87,6 +89,7 @@ Vagrant.configure(2) do |config|
     config.vm.define box, define_opts do |config|
       config.vm.box = 'elastic/debian-9-x86_64'
       deb_common config, box
+      deb_docker config
     end
   end
   'centos-6'.tap do |box|
@@ -99,6 +102,7 @@ Vagrant.configure(2) do |config|
     config.vm.define box, define_opts do |config|
       config.vm.box = 'elastic/centos-7-x86_64'
       rpm_common config, box
+      rpm_docker config
     end
   end
   'oel-6'.tap do |box|
@@ -117,12 +121,14 @@ Vagrant.configure(2) do |config|
     config.vm.define box, define_opts do |config|
       config.vm.box = 'elastic/fedora-28-x86_64'
       dnf_common config, box
+      dnf_docker config
     end
   end
   'fedora-29'.tap do |box|
     config.vm.define box, define_opts do |config|
       config.vm.box = 'elastic/fedora-28-x86_64'
       dnf_common config, box
+      dnf_docker config
     end
   end
   'opensuse-42'.tap do |box|
@@ -185,6 +191,63 @@ def deb_common(config, name, extra: '')
   )
 end
 
+def ubuntu_docker(config)
+  config.vm.provision 'install Docker using apt', type: 'shell', inline: <<-SHELL
+    # Install packages to allow apt to use a repository over HTTPS
+    apt-get install -y \
+      apt-transport-https \
+      ca-certificates \
+      curl \
+      gnupg2 \
+      software-properties-common
+
+    # Add Docker’s official GPG key
+    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
+
+    # Set up the stable Docker repository
+    add-apt-repository \
+      "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+      $(lsb_release -cs) \
+      stable"
+
+    # Install Docker. Unlike Fedora and CentOS, this also start the daemon.
+    apt-get update
+    apt-get install -y docker-ce docker-ce-cli containerd.io
+
+    # Add vagrant to the Docker group, so that it can run commands
+    usermod -aG docker vagrant
+  SHELL
+end
+
+
+def deb_docker(config)
+  config.vm.provision 'install Docker using apt', type: 'shell', inline: <<-SHELL
+    # Install packages to allow apt to use a repository over HTTPS
+    apt-get install -y \
+      apt-transport-https \
+      ca-certificates \
+      curl \
+      gnupg2 \
+      software-properties-common
+
+    # Add Docker’s official GPG key
+    curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
+
+    # Set up the stable Docker repository
+    add-apt-repository \
+      "deb [arch=amd64] https://download.docker.com/linux/debian \
+      $(lsb_release -cs) \
+      stable"
+
+    # Install Docker. Unlike Fedora and CentOS, this also start the daemon.
+    apt-get update
+    apt-get install -y docker-ce docker-ce-cli containerd.io
+
+    # Add vagrant to the Docker group, so that it can run commands
+    usermod -aG docker vagrant
+  SHELL
+end
+
 def rpm_common(config, name)
   linux_common(
     config,
@@ -195,6 +258,25 @@ def rpm_common(config, name)
   )
 end
 
+def rpm_docker(config)
+  config.vm.provision 'install Docker using yum', type: 'shell', inline: <<-SHELL
+    # Install prerequisites
+    yum install -y yum-utils device-mapper-persistent-data lvm2
+
+    # Add repository
+    yum-config-manager -y --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+
+    # Install Docker
+    yum install -y docker-ce docker-ce-cli containerd.io
+
+    # Start Docker
+    systemctl enable --now docker
+
+    # Add vagrant to the Docker group, so that it can run commands
+    usermod -aG docker vagrant
+  SHELL
+end
+
 def dnf_common(config, name)
   # Autodetect doesn't work....
   if Vagrant.has_plugin?('vagrant-cachier')
@@ -211,6 +293,25 @@ def dnf_common(config, name)
   )
 end
 
+def dnf_docker(config)
+  config.vm.provision 'install Docker using dnf', type: 'shell', inline: <<-SHELL
+    # Install prerequisites
+    dnf -y install dnf-plugins-core
+
+    # Add repository
+    dnf config-manager --add-repo https://download.docker.com/linux/fedora/docker-ce.repo
+
+    # Install Docker
+    dnf install -y docker-ce docker-ce-cli containerd.io
+
+    # Start Docker
+    systemctl enable --now docker
+
+    # Add vagrant to the Docker group, so that it can run commands
+    usermod -aG docker vagrant
+  SHELL
+end
+
 def suse_common(config, name, extra: '')
   linux_common(
     config,
@@ -268,7 +369,7 @@ def linux_common(config,
 
   # This prevents leftovers from previous tests using the
   # same VM from messing up the current test
-  config.vm.provision 'clean es installs in tmp', run: 'always', type: 'shell', inline: <<-SHELL
+  config.vm.provision 'clean es installs in tmp', type: 'shell', inline: <<-SHELL
     rm -rf /tmp/elasticsearch*
   SHELL
 

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/DistroTestPlugin.java

@@ -319,10 +319,14 @@ private List<ElasticsearchDistribution> configureDistributions(Project project,
         List<ElasticsearchDistribution> currentDistros = new ArrayList<>();
         List<ElasticsearchDistribution> upgradeDistros = new ArrayList<>();
 
-        for (Type type : Arrays.asList(Type.DEB, Type.RPM)) {
+        for (Type type : Arrays.asList(Type.DEB, Type.RPM, Type.DOCKER)) {
             for (Flavor flavor : Flavor.values()) {
                 for (boolean bundledJdk : Arrays.asList(true, false)) {
-                    addDistro(distributions, type, null, flavor, bundledJdk, VersionProperties.getElasticsearch(), currentDistros);
+                    // We should never add a Docker distro with bundledJdk == false
+                    boolean skip = type == Type.DOCKER && bundledJdk == false;
+                    if (skip == false) {
+                        addDistro(distributions, type, null, flavor, bundledJdk, VersionProperties.getElasticsearch(), currentDistros);
+                    }
                 }
             }
             // upgrade version is always bundled jdk
@@ -386,6 +390,11 @@ private static String distroId(Type type, Platform platform, Flavor flavor, bool
     }
 
     private static String destructiveDistroTestTaskName(ElasticsearchDistribution distro) {
-        return "destructiveDistroTest." + distroId(distro.getType(), distro.getPlatform(), distro.getFlavor(), distro.getBundledJdk());
+        Type type = distro.getType();
+        return "destructiveDistroTest." + distroId(
+            type,
+            distro.getPlatform(),
+            distro.getFlavor(),
+            distro.getBundledJdk());
     }
 }

buildSrc/src/main/java/org/elasticsearch/gradle/DistributionDownloadPlugin.java

@@ -93,8 +93,8 @@ void setupDistributions(Project project) {
             // for the distribution as a file, just depend on the artifact directly
             dependencies.add(distribution.configuration.getName(), dependencyNotation(project, distribution));
 
-            // no extraction allowed for rpm or deb
-            if (distribution.getType() != Type.RPM && distribution.getType() != Type.DEB) {
+            // no extraction allowed for rpm, deb or docker
+            if (distribution.getType().shouldExtract()) {
                 // for the distribution extracted, add a root level task that does the extraction, and depend on that
                 // extracted configuration as an artifact consisting of the extracted distribution directory
                 dependencies.add(distribution.getExtracted().configuration.getName(),
@@ -221,7 +221,6 @@ private Object dependencyNotation(Project project, ElasticsearchDistribution dis
     }
 
     private static Dependency projectDependency(Project project, String projectPath, String projectConfig) {
-
         if (project.findProject(projectPath) == null) {
             throw new GradleException("no project [" + projectPath + "], project names: " + project.getRootProject().getAllprojects());
         }
@@ -233,11 +232,20 @@ private static Dependency projectDependency(Project project, String projectPath,
 
     private static String distributionProjectPath(ElasticsearchDistribution distribution) {
         String projectPath = ":distribution";
-        if (distribution.getType() == Type.INTEG_TEST_ZIP) {
-            projectPath += ":archives:integ-test-zip";
-        } else {
-            projectPath += distribution.getType() == Type.ARCHIVE ? ":archives:" : ":packages:";
-            projectPath += distributionProjectName(distribution);
+        switch (distribution.getType()) {
+            case INTEG_TEST_ZIP:
+                projectPath += ":archives:integ-test-zip";
+                break;
+
+            case DOCKER:
+                projectPath += ":docker:";
+                projectPath += distributionProjectName(distribution);
+                break;
+
+            default:
+                projectPath += distribution.getType() == Type.ARCHIVE ? ":archives:" : ":packages:";
+                projectPath += distributionProjectName(distribution);
+                break;
         }
         return projectPath;
     }
@@ -250,9 +258,12 @@ private static String distributionProjectName(ElasticsearchDistribution distribu
         if (distribution.getBundledJdk() == false) {
             projectName += "no-jdk-";
         }
+
         if (distribution.getType() == Type.ARCHIVE) {
             Platform platform = distribution.getPlatform();
             projectName += platform.toString() + (platform == Platform.WINDOWS ? "-zip" : "-tar");
+        } else if (distribution.getType() == Type.DOCKER) {
+            projectName += "docker-export";
         } else {
             projectName += distribution.getType();
         }

buildSrc/src/main/java/org/elasticsearch/gradle/ElasticsearchDistribution.java

@@ -46,12 +46,25 @@ public enum Type {
         INTEG_TEST_ZIP,
         ARCHIVE,
         RPM,
-        DEB;
+        DEB,
+        DOCKER;
 
         @Override
         public String toString() {
             return super.toString().toLowerCase(Locale.ROOT);
         }
+
+        public boolean shouldExtract() {
+            switch (this) {
+                case DEB:
+                case DOCKER:
+                case RPM:
+                    return false;
+
+                default:
+                    return true;
+            }
+        }
     }
 
     public enum Flavor {
@@ -171,11 +184,16 @@ public String toString() {
     }
 
     public Extracted getExtracted() {
-        if (getType() == Type.RPM || getType() == Type.DEB) {
-            throw new UnsupportedOperationException("distribution type [" + getType() + "] for " +
-                "elasticsearch distribution [" + name + "] cannot be extracted");
+        switch (getType()) {
+            case DEB:
+            case DOCKER:
+            case RPM:
+                throw new UnsupportedOperationException("distribution type [" + getType() + "] for " +
+                    "elasticsearch distribution [" + name + "] cannot be extracted");
+
+            default:
+                return extracted;
         }
-        return extracted;
     }
 
     @Override
@@ -217,7 +235,7 @@ void finalizeValues() {
             if (platform.isPresent() == false) {
                 platform.set(CURRENT_PLATFORM);
             }
-        } else { // rpm or deb
+        } else { // rpm, deb or docker
             if (platform.isPresent()) {
                 throw new IllegalArgumentException("platform not allowed for elasticsearch distribution ["
                     + name + "] of type [" + getType() + "]");

distribution/docker/build.gradle

@@ -186,3 +186,37 @@ assemble.dependsOn "buildDockerImage"
 if (tasks.findByName("composePull")) {
     tasks.composePull.enabled = false 
 }
+
+/*
+ * The export subprojects write out the generated Docker images to disk, so
+ * that they can be easily reloaded, for example into a VM.
+ */
+subprojects { Project subProject ->
+  if (subProject.name.contains('docker-export')) {
+    apply plugin: 'distribution'
+
+    final boolean oss = subProject.name.startsWith('oss')
+
+    def exportTaskName = taskName("export", oss, "DockerImage")
+    def buildTaskName = taskName("build", oss, "DockerImage")
+    def tarFile = "${parent.projectDir}/build/elasticsearch${oss ? '-oss' : ''}_test.${VersionProperties.elasticsearch}.docker.tar"
+
+    final Task exportDockerImageTask = task(exportTaskName, type: LoggedExec) {
+      executable 'docker'
+      args "save",
+        "-o",
+        tarFile,
+        "elasticsearch${oss ? '-oss' : ''}:test"
+    }
+
+    exportDockerImageTask.dependsOn(parent.tasks.getByName(buildTaskName))
+
+    artifacts.add('default', file(tarFile)) {
+        type 'tar'
+        name "elasticsearch${oss ? '-oss' : ''}"
+        builtBy exportTaskName
+    }
+
+    assemble.dependsOn exportTaskName
+  }
+}

distribution/docker/docker-export/build.gradle

@@ -0,0 +1,2 @@
+// This file is intentionally blank. All configuration of the
+// export is done in the parent project.

distribution/docker/oss-docker-export/build.gradle

@@ -0,0 +1,2 @@
+// This file is intentionally blank. All configuration of the
+// export is done in the parent project.