https://github.com/lancelet/docker

Docker images
https://github.com/lancelet/docker

Last synced: 4 months ago
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Docker images

• Host: GitHub
• URL: https://github.com/lancelet/docker
• Owner: lancelet
• License: apache-2.0
• Created: 2016-04-13T22:16:17.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2016-08-30T05:56:22.000Z (over 9 years ago)
• Last Synced: 2025-07-05T05:42:10.745Z (6 months ago)
• Language: M4
• Size: 44.9 KB
• Stars: 0
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
Docker

======

[![Build

Status](https://travis-ci.org/lancelet/docker.svg?branch=master)](https://travis-ci.org/lancelet/docker)

> Docker images

Docker images for useful purposes.

### What is this monstrosity?

The purpose of this repository and its docker images is to provide a build

environment for a specific Haskell project (not mentioned here). The images may

or may not be useful to anyone else.

This setup is currently working around the following issues:

  1. A job limit of 50 minutes on travis.org.

  2. Lack of caching in Haskell `stack` for `extra-deps` dependencies in a

     `stack.yaml` file.

Haskell `stack` doesn't globally cache `extra-deps` dependencies that are

declared in a `stack.yaml` file. Instead, these are stored in a

project-specific cache. To get around this, dummy `.cabal` and `stack.yaml`

files are provided and a dummy project is created inside the Docker images at

`/opt/stack`. By using identical `extra-deps` and libraries, a build

environment can be created at this location which a later `stack` build can

re-use.

To combat the 50 minute limit on jobs at travis.org, the Docker build is split

into multiple images:

  - `centos-lts-a`

  - `centos-lts-b`

  - `centos-lts-c`

  - `centos-lts-b`

This is straightforward, but annoying. One annoying part of this setup is

keeping the version numbers of the multiple Docker images in sync. To achieve

this, the M4 macro processor is used to substitute version numbers across the

Dockerfiles.

### Notes

It's still necessary to switch to an explicit `stack` project directory (ie.

`/opt/stack` in this case) because of this stack issue:

https://github.com/commercialhaskell/stack/issues/1731