Coursier is unable to determine Scala version when cut off from the public Internet

[grepwood]

Hello,

I'm trying to run Coursier in a network where there is no gateway out of here. Except, we have one machine blessed with heavily moderated Internet access, that does all the gatekeeping and moderation. It acts as a mirror for a lot of things. We can access let's say, pretty much every pre-defined Maven resolver, as long as we specify the mirror address for each.

I have the following settings in my ~/.config/coursier/mirror.properties:

central.from=https://repo1.maven.org/maven2
central.to=https://mirror.organization/maven2
apache.from=https://repo.maven.apache.org/maven2
apache.to=https://mirror.organization/apache-maven2
sonatype.from=https://oss.sonatype.org/control/repositories/public
sonatype.to=https://mirror.organization/sonatype
typesafe.from=https://repo.typesafe.com/typesafe/releases
typesafe.to=https://mirror.organization/typesafe
ivy-releases.from=https://repo.typesafe.com/typesafe/ivy-releases
ivy-releases.to=https://mirror.organization/ivy-releases
sbt-plugins.from=https://repo.scala-sbt.org/scalasbt/sby-plugin-releases
sbt-plugins.to=https://mirror.organization/sbt-plugins
bintray.from=https://dl.bintray.com
bintray.to=https://mirror.organization/bintray
jcenter.from=https://jcenter.bintray.com
jcenter.to=https://mirror.organization/jcenter

I'm not sure if I got it right, but that's what I imagines the list should look like in my scenario, following the hints from https://scalameta.org/metals/docs/troubleshooting/proxy/#mirrors-still-do-not-work-for-all-dependencies and https://www.scala-sbt.org/1.x/docs/Resolvers.html#Predefined+resolvers

Then I try running:

coursier setup

and I get

Exception in thread "main" java.lang.Exception: coursier.install.AppArtifactScalaDependenciesNotFound: Can't find a scala version suffix for com.lihaoyi::ammonite:latest.release (likely a non existing module or version)

That is completely untrue. I can get Ammonite for Scala 2.13.1 through my organization's mirror.

By the way, don't you think all the *.from directives are a little, you know, redundant since we kinda expect Java/Scala/Coursier et al to know these addresses already?