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import mill.T
import mill.scalalib.JavaModule
import os.Shellable.IterableShellable
import scala.collection.immutable._
trait DockerModule { outer: JavaModule =>
trait DockerConfig extends mill.Module {
/**
* Tags that should be applied to the built image
* In the standard registry/repository:tag format
*/
def tags: T[Seq[String]] = T(List(outer.artifactName()))
def labels: T[Map[String, String]] = Map.empty[String, String]
def baseImage: T[String] = "gcr.io/distroless/java:latest"
def pullBaseImage: T[Boolean] = T(baseImage().endsWith(":latest"))
private def baseImageCacheBuster: T[(Boolean, Double)] = T.input {
val pull = pullBaseImage()
if(pull) (pull, Math.random()) else (pull, 0d)
}
def dockerfile: T[String] = T {
val jarName = assembly().path.last
val labelRhs = labels()
.map { case (k, v) =>
val lineBrokenValue = v
.replace("\r\n", "\\\r\n")
.replace("\n", "\\\n")
.replace("\r", "\\\r")
s""""$k"="$lineBrokenValue""""
}
.mkString(" ")
val labelLine = if(labels().isEmpty) "" else s"LABEL $labelRhs"
s"""
|FROM ${baseImage()}
|$labelLine
|COPY $jarName /$jarName
|ENTRYPOINT ["java", "-jar", "/$jarName"]
""".stripMargin
}
final def build = T {
val dest = T.ctx().dest
val asmPath = outer.assembly().path
os.copy(asmPath, dest / asmPath.last)
os.write(dest / "Dockerfile", dockerfile())
val log = T.ctx().log
val tagArgs = tags().flatMap(t => List("-t", t))
val (pull, _) = baseImageCacheBuster()
val pullLatestBase = IterableShellable(if(pull) Some("--pull") else None)
val result = os
.proc("docker", "build", tagArgs, pullLatestBase, dest)
.call(stdout = os.Inherit, stderr = os.Inherit)
log.info(s"Docker build completed ${if(result.exitCode == 0) "successfully" else "unsuccessfully"} with ${result.exitCode}")
tags()
}
final def push() = T.command {
val tags = build()
tags.foreach(t => os.proc("docker", "push", t).call(stdout = os.Inherit, stderr = os.Inherit))
}
}
}
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