scala 有没有办法在 build.sbt 中定义所需的 sbt 版本？

Is there a way to define the required sbt version in build.sbt?

提问by Bar

In the build.sbt definition of a Scala project, is it possible to define the minimum version of sbt that is required to build the project?

在 Scala 项目的 build.sbt 定义中，是否可以定义构建项目所需的最低 sbt 版本？

回答by dk14

project/build.propertiesallows you to force sbt to use particular version. If current version of installed sbt is different - sbt itself will download (if needed) the version you've specified there:

project/build.properties允许您强制 sbt 使用特定版本。如果安装的 sbt 的当前版本不同 - sbt 本身将下载（如果需要）您在那里指定的版本：

sbt.version=0.12.0

See, Hellofor instance. So actually you may have installed several versions of sbt in your system - it's just jars, that placed in .sbt/boot/scala-{scala.version required by this sbt}/org.scala-sbt/sbt/{sbt.version}folder. Sbt executable actually looks for version specified in project/build.propertiesor (if it's not specified) highest version installed in the system.

看，你好。所以实际上你可能已经在你的系统中安装了几个版本的 sbt - 它只是 jars，放在.sbt/boot/scala-{scala.version required by this sbt}/org.scala-sbt/sbt/{sbt.version}文件夹中。Sbt 可执行文件实际上查找project/build.properties系统中安装的或（如果未指定）最高版本中指定的版本。

P.S. From sbt-launcherperspective, sbt is only one dependency with small non-intersecting others like ansi.jar, so specifying the range of versions like [0.13.1, 0.13.8]have no much sense as it would be efective only for conflicting transitive deps. Otherwise it's enough to specify higher possible version (which would compile) - you may even choose some version that you already have (and update project's sbt that way).

PS 从sbt-launcher角度来看， sbt 只是一个与其他小的不相交的依赖项，例如ansi.jar，因此指定版本范围[0.13.1, 0.13.8]没有多大意义，因为它仅对冲突的传递依赖项有效。否则，指定更高的可能版本（将编译）就足够了 - 您甚至可以选择一些您已经拥有的版本（并以这种方式更新项目的 sbt）。