Using the sbt-docker plugin.

Note, still need to use the `docker` service in Travis, as you cannot
programmatically log in to private repositories, like Heroku. See
marcus-drake/sbt-docker#28 for more details.

Author: noelmarkham

.travis.yml

@@ -25,8 +25,7 @@ after_success:
      sbt publishSignedAll;
      echo "Deploying to Heroku";
      docker login [email protected] --password=$heroku_token registry.heroku.com;
-     docker build -t registry.heroku.com/scala-evaluator-sandbox/web .;
-     docker push registry.heroku.com/scala-evaluator-sandbox/web;
+     sbt dockerBuildAndPush;
   fi
 - if [ "$TRAVIS_PULL_REQUEST" = "true" ]; then
      echo "Not in master branch, skipping deploy and release";

build.sbt

@@ -56,6 +56,7 @@ lazy val `evaluator-server` = (project in file("server"))
   .dependsOn(`evaluator-shared-jvm`)
   .enablePlugins(JavaAppPackaging)
   .enablePlugins(AutomateHeaderPlugin)
+  .enablePlugins(sbtdocker.DockerPlugin)
   .settings(noPublishSettings: _*)
   .settings(
     name := "evaluator-server",
@@ -78,7 +79,27 @@ lazy val `evaluator-server` = (project in file("server"))
     ),
     assemblyJarName in assembly := "evaluator-server.jar"
   )
+  .settings(dockerSettings)
   .settings(compilerDependencySettings: _*)
 
 onLoad in Global := (Command.process("project evaluator-server", _: State)) compose (onLoad in Global).value
 addCommandAlias("publishSignedAll", ";evaluator-sharedJS/publishSigned;evaluator-sharedJVM/publishSigned;evaluator-clientJS/publishSigned;evaluator-clientJVM/publishSigned")
+
+lazy val dockerSettings = Seq(
+  docker <<= docker dependsOn assembly,
+  dockerfile in docker := {
+
+    val artifact: File = assembly.value
+    val artifactTargetPath = artifact.name
+
+    sbtdocker.immutable.Dockerfile.empty
+      .from("ubuntu:latest")
+      .run("apt-get", "update")
+      .run("apt-get", "install", "-y", "openjdk-8-jdk")
+      .run("useradd", "-m", "evaluator")
+      .user("evaluator")
+      .add(artifact, artifactTargetPath)
+      .cmdRaw(s"java -Dhttp.port=$$PORT -jar $artifactTargetPath")
+  },
+  imageNames in docker := Seq(ImageName(repository = "registry.heroku.com/scala-evaluator-sandbox/web"))
+)

project/EvaluatorBuild.scala

@@ -86,7 +86,7 @@ object EvaluatorBuild extends AutoPlugin {
 
       val projectName = Project.extract(s).currentProject.id
 
-      s"$blue$projectName$white>${c.RESET}"
+      s"$blue$projectName$white>${c.RESET} "
     }
   )
 

project/plugins.sbt

@@ -4,3 +4,4 @@ addSbtPlugin("de.heikoseeberger" % "sbt-header" % "1.6.0")
 addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.0.1")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.12")
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.3")
+addSbtPlugin("se.marcuslonnberg" % "sbt-docker" % "1.4.0")