Ability to add to class path in the bash script

[hadesara]

After Play dist
If we are calling the bash/bat script thats under bin from other build script, there has to be a way to add jars to the classpath. -J-X option allows us to pass additional parameters but its not usable to add to existing classpath.

[mariussoutier]

👍 Would like this as well to reduce the size of the dist file by excluding JARs that are present on the server anyway.

[muuki88]

I think this is related to #72 The same concerns remain

• classpath ordering
• security

[mariussoutier]

I'm not asking for a wildcard, so classpath ordering would not be an issue. Just the ability to add a JAR to the classpath that is not inside the lib folder (for that you can simply add to scriptClasspath).

What are the security concerns?

[kardapoltsev]

I'm also looking for some way to decrease package size, it would be great to handle dependencies some way but I don't know good way for this :(

[muuki88]

Hm. What about the possibility to symlink dependencies. Like

providedDependenciesMapping ++= Seq(
   "com.example" % "commons" % "1.0" -> "/usr/share/java/com.example.commons-1.0.jar"
)

This is very rough idea, but you get the gist. I'm not sure if this would get too tedious
keeping track of the dependencies. However with this technique you wouldn't have to
touch the classpath stuff.

[mariussoutier]

Yeah I guess it can get hairy pretty fast...

[kardapoltsev]

LGTM :) I think I could try to implement this.

[kardapoltsev]

I'm not sure if this would get too tedious keeping track of the dependencies.

It would)

[kardapoltsev]

I think it will much simpler and robust way is to provide exact jars (biggest in my case), since manual dependency management will be really tedious. What do you think about?

providedDependenciesMapping ++= Seq(
  "com.example.commons-1.0.jar" -> "/usr/share/java/com.example.commons-1.0.jar"
)

But if anyone has better idea it'll be super)

[muuki88]

Sure, sure. I proposed the one with the artifact identifier, so you may be able to pick it out
from the raw dependencies. Anyway, I'm looking forward to see a prototype :)

[muuki88]

An update on this. There is a setting scriptClasspath

TaskKey[Seq[String]]("scriptClasspath",
 """
 A list of relative filenames (to the lib/ folder in the distribution) 
 of what to include on the classpath.
 """
)

You may override this at your own risk. I'm using this for the fat-jar creating with sbt-assembly