This repository contains a reusable set of overlays to build base images with docker.mk. Each overlay is essentially a Go template that defines templates for each "family" of OS supported. e.g. for the java-8 overlay there are 3 templates defined for installing Java that can support 4 different operating systems: alpine, centos, ubuntu, and debian.
- java-8 - Installs OpenJDK 8. Supports
apk,apt, oryuminstall depending on theOSandOS_FAMILYcurrently set.
Images that use these overlays are built from branches. Each branch corresponds to an image and contains the necessary Makefile and .travis.yml needed to build and publish the image.
Before an image is pushed to Docker Hub, make sure the test target is run and that tests for the image exist in a test/my-image.mk file and that targets are defined that are prefixed with test-. An example test can be found in the test/java-8.mk file.
To contribute to this repository, create a PR that includes an overlay in common or targets a branch named for the image to create. Create the overlay by naming it something.Dockerfile, where something will be the name used to include your overlays in the OVERLAYS of the Makefile. Also include a test in a test/something.mk file and name any targets you want run test-something. You can include more than one test- target--in fact include as many as you need to test that the overlay is installing what's expected and that it functions properly. A good way to verify this is to use the --help or --version of the utility you're installing and verify the output matches your expectations with a bash regex.