Re: Re: old version of scala
Hi
Having dug a little deeper into building scala 2.12.8, I have found two
issues that needs some explaining.
Scala and sbt environemnts are a bit different from the ordinary java or
C environments.
I know there already exists scala and sbt packages in debian, but as far
as I understand those were built with Ant, which is the old way of doing
things in scala/sbt. Nevertheless, the following might not be news.
1- Scala requires scala and sbt to build the scala project. Likewise Sbt
requires scala and sbt, to build the sbt project.
2- scala does not require a system or user installation of scala, as is
normal with f.ex. java and maven.
- Instead, a scala project describes its scala and sbt versions in its
build file, which sbt uses to bootstrap the project build environment.
I.e. it downloads and installs the required scala and sbt version inside
the project environment, affecting no other projects, or the system.
- so in fact, one actually only needs to install the latest sbt
version on a system, to bootstrap, compile and test-run any scala
project. (running the completed application, as a user, requires a scala
installation on the system)
With these facts at hand, the question is how to deal with this in the
debian build system?
On the local maintainers machine, he just downloads and installs the
tarballs of scala and sbt, to compile the newest version of scala and
sbt. Then he edits, build and tests the package-src for both scala and
sbt locally. But the actual building of the packages on the CI system
requires sbt to already be manually installed, without a preexisting sbt
package.
So to build on CI system, is it allowed to preconfigure it manually with
the newest sbt version, i.e. version 1.x, from a tarball download?
Regards
Thomas
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