How to publish to multiple repositories in SBT?

Question

I am in the middle of upgrading Nexus version. As part of the process I've set up a new Nexus instance which will run in parallel with the older Nexus instance.

While migrating to the new instance I want to thoroughly test and vet the new instance before pulling the plug on older instance. This requires me to temporarily modify the publish workflow in such a way that sbt publishes the artifacts to both the Nexus instances.

I highly doubt the following code will actually work:

    publishTo <<= (version) {
       version: String =>
       if (version.trim.endsWith("SNAPSHOT")) Some("snapshots" at "http://maven1.dev.net:8081/nexus/content/" + "repositories/snapshots/")
       else Some("releases" at "http://maven1.dev.net:8081/nexus/content/" + "repositories/releases/")
    },
    credentials += Credentials("Sonatype Nexus Repository Manager", "maven1.dev.net", "release-eng", "release"),

    publishTo <<= (version) {
       version: String =>
       if (version.trim.endsWith("SNAPSHOT")) Some("snapshots" at "http://maven2.dev.net:8081/nexus/content/" + "repositories/snapshots/")
       else Some("releases" at "http://maven2.dev.net:8081/nexus/content/" + "repositories/releases/")
    },
    credentials += Credentials("Sonatype Nexus Repository Manager", "maven2.dev.net", "release-eng", "release"),

I also tried looking into a plugin called sbt-multi-publish but I couldn't compile and use it, either.

Answer 1

With Commands and How to change a version setting inside a single sbt command? I could define a new command - myPublishTo - that changes publishTo setting before executing the original publish task:

def myPublishTo = Command.command("myPublishTo") { state =>
  val extracted = Project.extract(state)
  Project.runTask(
    publish in Compile,
    extracted.append(List(publishTo := Some(Resolver.file("file", target.value / "xxx"))), state),
    true
  )
  Project.runTask(
    publish in Compile,
    extracted.append(List(publishTo := Some(Resolver.file("file", target.value / "yyy"))), state),
    true
  )
  state
}

commands += myPublishTo

With this, execute myPublishTo as any other command/task.

You could also define a couple of aliases - pxxx, pyyy and pxy - in build.sbt that would execute a series of commands using ;.

addCommandAlias("pxxx", "; set publishTo := Some(Resolver.file(\"file\", target.value / \"xxx\")) ; publish") ++
addCommandAlias("pyyy", "; set publishTo := Some(Resolver.file(\"file\", target.value / \"yyy\")) ; publish") ++
addCommandAlias("pxy", "; pxxx ; pyyy")

In sbt console you can execute them as any other commands/tasks.

[sbt-0-13-1]> alias
    pxxx = ; set publishTo := Some(Resolver.file("file", target.value / "xxx")) ; publish
    pyyy = ; set publishTo := Some(Resolver.file("file", target.value / "yyy")) ; publish
    pxy = ; pxxx ; pyyy
[sbt-0-13-1]> pxy
[info] Defining *:publishTo
[info] The new value will be used by *:otherResolvers, *:publishConfiguration
[info] Reapplying settings...
[info] Set current project to sbt-0-13-1 (in build file:/Users/jacek/sandbox/so/sbt-0.13.1/)
...
[info]  published sbt-0-13-1_2.10 to /Users/jacek/sandbox/so/sbt-0.13.1/target/xxx/default/sbt-0-13-1_2.10/0.1-SNAPSHOT/sbt-0-13-1_2.10-0.1-SNAPSHOT-javadoc.jar
[success] Total time: 1 s, completed Jan 9, 2014 11:20:48 PM
[info] Defining *:publishTo
[info] The new value will be used by *:otherResolvers, *:publishConfiguration
[info] Reapplying settings...
...
[info]  published sbt-0-13-1_2.10 to /Users/jacek/sandbox/so/sbt-0.13.1/target/yyy/default/sbt-0-13-1_2.10/0.1-SNAPSHOT/sbt-0-13-1_2.10-0.1-SNAPSHOT-javadoc.jar
[success] Total time: 0 s, completed Jan 9, 2014 11:20:49 PM

Answer 2

This is an old question, but the problem persists. I tried to revive sbt-multi-publish, but it's really old (sbt-0.12) and uses some sbt internals that are hard to deal with. So I took another approach and wrote a new plugin: sbt-publish-more.
It doesn't involve any on-the-fly settings changing or custom commands like the other answer.

After you add the plugin, just set resolvers you want to publish to (taking your code as an example):

publishResolvers := {
  val suffix = if (isSnapshot.value) "shapshots" else "releases"
  Seq(
    s"Maven1 ${suffix}" at s"http://maven1.dev.net:8081/nexus/content/repositories/${suffix}/",
    s"Maven2 ${suffix}" at s"http://maven2.dev.net:8081/nexus/content/repositories/${suffix}/"
  )
} 

And call publishAll task, it will publish to both repositories. You can also publish to different repositories with different configurations. Check usage docs for details.