使用 sbt-assembly 重命名文件 [英] Rename file using sbt-assembly

问题描述

我有一个使用 ConfigFactory 来设置应用程序配置的 Scala 项目.对于构建，我使用 sbt(与 sbt-assembly 一起使用).

I have a scala project that uses the ConfigFactory to set up the application configurations. For building I use sbt (together with sbt-assembly).

根据我是使用 sbt-assembly 创建程序集还是只是运行项目，我想使用不同的配置文件(application.conf 在运行时项目，assembly.conf 运行项目的程序集时).

Depending on whether I create an assembly with sbt-assembly or whether I just run the project, I would like to use different config files (application.conf when running the project, assembly.conf when running the assembly of the project).

我想到使用 assemblyMergeStrategy 来达到这个目的:在组装 jar 时，我会丢弃 application.conf 并重命名 assembly.conf>.我的想法是这样的:

I thought of using the assemblyMergeStrategy for this purpose: When assembling the jar, I would discard the application.conf and rename assembly.conf. My idea was something like:

assemblyMergeStrategy in assembly := {
  case PathList("application.conf") => MergeStrategy.discard
  case PathList("assembly.conf") => MergeStrategy.rename
  ...
}

通过这个我想实现的是，在组装jar时，文件assembly.conf被重命名为application.conf，因此被使用ConfigFactory，而原来的 application.conf 被丢弃.

By this I would like to achieve is that when assembling the jar, the file assembly.conf is renamed to application.conf and is therefore used by ConfigFactory, whereas the original application.conf is discarded.

上面的代码显然不起作用，因为我无法指定assembly.conf 应该重命名为哪个文件名.我怎样才能做到这一点?

The code above obviously does not work, as I cannot specify to what filename assembly.conf should be renamed to. How can I achieve this?

推荐答案

您需要定义自己的 MergeStrategy(在 project 目录中)，它将文件重命名为 application.conf 然后在汇编中重新定义assemblyMergeStrategy 丢弃原来的application.conf 并将MyMergeStrategy 应用到assembly.conf:

You need to define your own MergeStrategy(in project directory) that will rename files to application.conf and then redefine assemblyMergeStrategy in assembly to discard original application.conf and apply MyMergeStrategy to assembly.conf:

import java.io.File   
import sbtassembly.MergeStrategy

class MyMergeStrategy extends MergeStrategy{
  override def name: String = "Rename to application.conf"

  override def apply(tempDir: File, path: String, files: Seq[File]): Either[String, Seq[(File, String)]] = {
    Right(files.map(_ -> "application.conf"))
  }
}

然后在build.sbt中使用:

And then use in build.sbt:

val root = (project in file(".")).settings(Seq(
  assemblyMergeStrategy in assembly := {
    case PathList("application.conf") => MergeStrategy.discard
    case PathList("assembly.conf") => new MyMergeStrategy()
    case x =>
      val oldStrategy = (assemblyMergeStrategy in assembly).value
      oldStrategy(x)
  }
))

这仅适用于您的情况，但对于更复杂的情况，我会阅读他们在 sbt-native-packager 中的做法:https://www.scala-sbt.org/sbt-native-packager/recipes/package_configuration.html

This will do just for your case but for more complicated cases I would read how they do it in sbt-native-packager: https://www.scala-sbt.org/sbt-native-packager/recipes/package_configuration.html

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