How to extract data from build.sbt in command line

Question

i would like to get data like version, packageName in Docker and such somehow. I need it for my CI to tag docker image for future use. So is there any possibility to get such values like with maven mvn --batch-mode -f pom.xml help:evaluate -Dexpression=project.version. Thanks for help in advance.

So my build.sbt contains several projects and right now i am trying to use sbt projects,sbt inspect from sbt inspect build but no luck so far.

I managed to get key values from project but now i have problem with packageName in Docker. i make it with: sbt [project_name]/[key] but for packageName in Docker i got:

sbt projectName/packageName in Docker
[error] Not a valid command: in
[error] Expected 'info'
[error] Not a valid project ID: in
[error] Expected ':' (if selecting a configuration)
[error] Not a valid key: in
[error] in
[error]   ^

This is part of build.sbt:

lazy val `name` = project
  .in(file("name"))
  .dependsOn(`name-dep`)
  .settings(defaults)
  .settings(
    packageName in Docker := "project/name",
    version := "3.1.0-SNAPSHOT",
    dockerExposedPorts := Seq(8080),
    dockerCommands ++= Seq(
      Cmd("ENTRYPOINT",
        s"bin/${executableScriptName.value}",
        "-l", "tcp://0.0.0.0:8081",
        "-e", "${EXTERNAL_URL}",
        "-c", "${CONNECTOR_URL}")
    ),

For version i use:

sbt name/version
[info] Loading project definition from /home/jenkins/.jenkins/workspace/project
[info] Set current project to root (in build file:/home/jenkins/.jenkins/workspace/)
[info] 3.1.0-SNAPSHOT

but i have problems with packageName in Docker

My Solution:

so i managed to get those values with:

# sbt -Dsbt.log.noformat=true name/packageName | sed -n 3p | cut -d " " -f 2
name

it dosen't display whole packageName ( without project/ ) but as i know that this is a constant i will hardcode it in CI script.

and

# sbt -Dsbt.log.noformat=true name/version | sed -n 3p | cut -d " " -f 2
3.1.0-SNAPSHOT

if anyone has better idea please share with me.

Tip

Be advised that sbt i using ASCII codes to colorize the output so tu use it like in my solution you have to run sbt with -Dsbt.log.noformat=true otherwise your CI can complain about ENV's values and you wont see this.

Answer 1

My suggestion would be to use sbt-native-packager.

Also this packager got Docker Plugin

Which gives you out of box docker image on sbt build with version number. We are using sbt-package-manager in all our modules.