Overview

This repo contains scripts to generate language specific dockerfiles and building VM/container images for CI environment.

Mainly it contains two rake commands.

1. Getting Started

Install the dependencies using bundle

    bundle install

2. Generating Dockerfile

The list of supported progamming languages can be found under languages folder. These files defines the base docker image
and common system libraries needed in a CI environment.

To generate dockerfiles for a language

    rake generate:dockerfile[<lang>] [DIRECTORY=generated]

It would also generate a manifest.json while consists the docker image name, it’s variants and tags.

You can bump following tools before generating the dockerfiles -

    GRADLE_VERSION
    ANT_VERSION
    lein_tag / LEIN_VERSION
    SBT_VERSION
    MAVEN_VERSION

3. Building container images

Step2 will generate various manifest files along with dockerfiles for the latest versions/tags. To build the customized
container images

    rake generate:build[<lang>] DIRECTORY=generated

The above commands supports following environment variables -
| Name | Default Value | Description |
|———————|——————————|————————————|
|CI | N/A | If present, it will build the container images
|DIRECTORY | dockerfiles | The directory path where manifests are generated |
|TAGS | ALL | Optionally specify which tags to consider
|DOCKER_PUSH | N/A | Push to dockerhub if present

Example: rake generate:build[ruby] CI=true DOCKER_PUSH=true DIRECTORY=generated TAGS=2

Updating base image

Please follow ci-img README for upgrading.

Updating dependencies in language runtimes

We also add few dependencies along with standard language tooling - docker, docker-compose, git. You might want to change the versions before re-generating the Dockerfile(s).

For nodejs variants, we fetch the lts version from the github (nodejs) and try to infer the extracted version.