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Document sbtOn in CONTRIBUTING.md

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Dale Wijnand 2018-04-25 15:08:29 +01:00
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CONTRIBUTING.md
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@ -183,6 +183,39 @@ When you run a locally built sbt, the JAR artifacts will be now cached under `$H
One drawback of `-SNAPSHOT` version is that it's slow to resolve as it tries to hit all the resolvers. You can workaround that by using a version name like `1.$MINOR.$PATCH-LOCAL1`. A non-SNAPSHOT artifacts will now be cached under `$HOME/.ivy/cache/` directory, so you need to clear that out using [sbt-dirty-money](https://github.com/sbt/sbt-dirty-money)'s `cleanCache` task.
### Running sbt "from source" - `sbtOn`
In addition to locally publishing a build of sbt, there is an alternative, experimental launcher within sbt/sbt
to be able to run sbt "from source", that is to compile sbt and run it from its resulting classfiles rather than
from published jar files.
Such a launcher is available within sbt/sbt's build through a custom `sbtOn` command that takes as its first
argument the directory on which you want to run sbt, and the remaining arguments are passed _to_ that sbt
instance. For example:
I have setup a minimal sbt build in the directory `/s/t`, to run sbt on that directory I call:
```bash
> sbtOn /s/t
[info] Packaging /d/sbt/scripted/sbt/target/scala-2.12/scripted-sbt_2.12-1.2.0-SNAPSHOT.jar ...
[info] Done packaging.
[info] Running (fork) sbt.RunFromSourceMain /s/t
Listening for transport dt_socket at address: 5005
[info] Loading settings from idea.sbt,global-plugins.sbt ...
[info] Loading global plugins from /Users/dnw/.dotfiles/.sbt/1.0/plugins
[info] Loading project definition from /s/t/project
[info] Set current project to t (in build file:/s/t/)
[info] sbt server started at local:///Users/dnw/.sbt/1.0/server/ce9baa494c7598e4d59b/sock
> show baseDirectory
[info] /s/t
> exit
[info] shutting down server
[success] Total time: 19 s, completed 25-Apr-2018 15:04:58
```
Please note that this alternative launcher does _not_ have feature parity with sbt/launcher. (Meta)
contributions welcome! :-D
### Diagnosing build failures
Globally included plugins can interfere building `sbt`; if you are getting errors building sbt, try disabling all globally included plugins and try again.