WIP - Run OS dependent SBT tasks

Goal

Sometimes you will need to run SBT task that depends on OS specific features, for example packaging your application as an RPM archive.

The sbt-native-packager supports this, but it requires rpmbuild command to be present. The rpmbuild command is only specific for RPM based system.

If you are developing on non-RPM system (i.e. Ubuntu or MacOS), this plugin will come in handy.

Simply execute your SBT tasks using this plugin, i.e.

$ sbt "in-docker:centos7 my-module/rpm:packageBin"

This will invoke my-module's rpm:packageBin task within Docker image configured for Centos 7. The resulting RPM file will be present in the my-module's target directory.

Important: Note the use of double quotes to enclose the in-docker/centos7 and the subsequent task. The double quotes is important as it allows the subsequent task to be presented as input argument to the plugin.

Similarly for Debian.

$ sbt "in-docker:xenial my-module/rpm:packageBin"

Pre-requisite

• Docker installed and running.

How it works

The plugin relies on inputKey task to accept the tasks to be run within the Docker container.

The plugin starts a Docker container with appropriate image, mounting the following directories into the container.

Host Dir	Container Dir	Mode	Comment
Current project Dir	/opt/source	rw	Read and write mount is required to write the result of the task into the project directory
~/.ivy2/cache	/root/.ivy2/cache	rw	Read and write mount is required to read the cached jars and to write the resolved jars
~/.ivy2/local	/root/.ivy2/local	rw	Read and write mount is required to read the cached SBT plugins and to write the resolved plugins
~/.sbt/preloaded	/root/.sbt/preloaded	r	Read only is required to read the cached SBT artifacts.

Dependency: Docker images

This plugin depends on the Docker images placed in the docker-images/ directory.

At the moment the following Docker images are present.

centos-7-jdk-8-sbt

This image is created to facilitate building RPM archives on non-RPM distro.

The centos:7 image is used as base image with the following additional items installed:

• Open JDK 8
• SBT 1.0.4

xenial-jdk-8-sbt

This image is created to facilitate building Debian archives on non Debian based distro.

The ubuntu:xenial image is used as base image with the following additional items installed:

• Open JDK 8
• SBT 1.0.4