I’ve highlighted the one I am after, but you can see that TeamCity is passing a lot of data to the SBT runner, it uses java to run from the command line instead of just running the SBT command itself.

There is something i am missing though, I need to know the branch name, becuase we have a convention that if is not built from the master branch we use a “-branchname” at the end. So to add this in you need to edit your SBT runner step in teamcity and add the below

From this we can use this variable in our Build.Scala file like so, I also add a value for team that is used later.

val dockerRegistry = "MyprivateDockerReg.company.com"
 val team = "myteam"
val appName = "ycs-supply-api"
 var PROJECT_VERSION = Option(System.getProperty("build.number")).getOrElse("0.0.4")

 val BRANCH = Option(System.getProperty("teamcity.build.branch")).getOrElse("SNAPSHOT")
 if ( BRANCH != "master")
 {
 PROJECT_VERSION = PROJECT_VERSION + "-" + BRANCH.replace("-","").replace("/","")
 }

Now for docker, in you SBT plugins directory make sure you have this line to import the plugin

Then here is what our Build.sbt looks like

import scala.xml.{Elem, Node}

enablePlugins(JavaAppPackaging)

name := "MyAppBin"

dockerfile in docker := {
val appDir: File = stage.value
val targetDir = s"/opt/$team"

new Dockerfile {
from("java:8-jre-alpine")
maintainer(s"$team")

runRaw(s"mkdir -p $targetDir")
workDir(s"$targetDir")
copy(appDir, targetDir)
expose(80)
env("JAVA_OPTS" -> s"-Dappname=$appName -Dconfig.file=conf/application-qa.conf -Dlog.dir=log/ -Dlogback.configurationFile=conf/logback-test.xml -Xms256m -Xmx256m -server")
entryPoint(s"bin/${name.value}")
}
}

imageNames in docker := Seq(
// SPAPI Sets the latest tag
ImageName(s"$dockerRegistry/$team/$appName:latest"),
// SPAPI Sets a name with a tag that contains the project version
ImageName(s"$dockerRegistry/$team/$appName:${version.value}")
)

mainClass in Compile := Some("Boot")

buildOptions in docker := BuildOptions(
cache = true,
removeIntermediateContainers = BuildOptions.Remove.Always,
pullBaseImage = BuildOptions.Pull.IfMissing
)

This will get us building the container and saving it to the local docker cache. After this we need to push it to our private registry.

There is currently an open issue about SBT-Docker here so I couldn’t get docker login to run from SBT so I created a separate task in TeamCity to handle this.

To do this i want to keep a lot of my settings in the Build.Scala so that the experience on the local will be similar to the build server, but I don’t want to text parse, so what we can do is output some logs for SBT to tell TeamCity what settings to use.

Add these two lines in

println(s"##teamcity[setParameter name='DockerContainerCreated' value='$dockerRegistry/$team/$appName:${version.value}']")
println(s"##teamcity[setParameter name='SbtDockerRegistry' value='$dockerRegistry']")</div>

This Will make SBT output the format that TeamCity Reads to set parameters and allow us to create the next step as a command line step.

Next add these parameters is as empty

Then we can create a command line step that does the docker login/push

And we are done! you should see your container in the registry now, and if like us you are using Octopus Deploy you will see the container appear on searches and the version numbers will correct be associated with the containers