Override sbt's `fork` setting

user_3264147 0
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I have an Akka app that has a fork := true setting in build.sbt. So when I need to debug code I set it manually to false. That is something which is easy to forget.

Is there a way to override the fork setting from command line? For example when running sbt clean run. I've read that one can create a separate task and override fork just for that task. In latter case how would the clean run task look like?

Update: Sorry for the confusion. Following Marko's reply I realized that my ticket was incomplete. I would like a way to set this in a non-interactive shell. Right now I have an IntelliJ sbtTask (which also takes environment variables etc.) for which I just click the debug button to run the app. The task itself has only two words in it - clean run, but should need to create a separate one that would be fine.

sbt intellij-idea scala fork
2 Answers

Consider set command, for example from within sbt shell

set fork := false; clean; run

change will stick until

sbt is restarted, the build is reloaded, or the setting is overridden by another set command or removed by the session command

user_52050220

Mario's answer is very good, but I was curious if there was a single line instruction that I could share with my team. I think I've finally found it thanks to this FAQ item in Sbt documentation.

In build.sbt you can add the following:

lazy val runWithForkFalse = taskKey[Unit]("Run application with `set fork:= false` for debugging purpose.")

runWithForkFalse / fork := false

fullRunTask(runWithForkFalse, Compile, "com.Main")

Then in InelliJ you can create a Sbt task that has only two words clean runWithForkFalse and click on their debug icon. You can also of course just run sbt clean runWithForkFalse from command line.

user_32641470
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