mill does not honor the custom repositories at global scale

[shengc]

in sbt, I can override the default repositories by setting

-Dsbt.override.build.repos=true -Dsbt.repository.config=...

so I can pass in a list of custom repositories for the entire build.

For mill, although documentation suggests one can override the repositories through the repositories task, the initial dependencies needed to boostrap the build are still resolved through the default repositories.

[19/26] readapi.compileClasspath
3 targets failed
mill.scalalib.ScalaWorkerModule.classpath
Resolution failed for 1 modules:
--------------------------------------------
  com.lihaoyi:mill-scalaworker_2.12:0.1.6
        not found: /Users/shengc/.ivy2/local/com.lihaoyi/mill-scalaworker_2.12/0.1.6/ivys/ivy.xml
        download error: Caught java.net.UnknownHostException: repo1.maven.org (repo1.maven.org) while downloading https://repo1.maven.org/maven2/com/lihaoyi/mill-scalaworker_2.12/0.1.6/mill-scalaworker_2.12-0.1.6.pom

mill.scalalib.ScalaWorkerModule.compilerInterfaceClasspath
Resolution failed for 1 modules:
--------------------------------------------
  org.scala-sbt:compiler-interface:1.1.0
        not found: /Users/shengc/.ivy2/local/org.scala-sbt/compiler-interface/1.1.0/ivys/ivy.xml
        download error: Caught java.net.UnknownHostException: repo1.maven.org (repo1.maven.org) while downloading https://repo1.maven.org/maven2/org/scala-sbt/compiler-interface/1.1.0/compiler-interface-1.1.0.pom

I am behind a proxy, so in order to adopt mill for my work, I need a way to configure the repositories globally just like sbt does.

[lihaoyi]

@shengc can you try following the instructions here? That should let it work, and if it works for you help me add it to the documentation somewhere :)

[shengc]

@lihaoyi yep that works. I can send a PR to update Readme.md after hours.

[shengc]

@lihaoyi for import $ivy, the custom repositories still does not work. The following can download the dependencies

interp.repositories() ++= Seq(...)
interp.load.ivy(...)

However, the downloaded dependencies are not added to the build.

[shengc]

@lihaoyi if I pass in the revolvers through --predef to mill, then import $ivy... works. Is there any initialization misconfiguration lurked in the code ?