build.rb

#!/usr/bin/env ruby

# Setenv
# TODO: Find something better for this..
# TODO: Find a way to get the project name
# TODO: Rename to pre-recieve?
HOME = "/Users/dhiemstra/Projects/docker/builder/local"
BIN_PATH = "#{HOME}/bin"
REPOS_PATH = "#{HOME}/repos"
BUILDS_PATH = "#{HOME}/builds"
RELEASES_PATH = "#{HOME}/releases"
SHARE_PATH = "#{HOME}/share"

puts "Running post-receive hook.."

require 'yaml'

def exec(command)
  puts "Running: #{command}"
  system(command)

  exit 1 if $?.exitstatus > 0
end

# Read commit info
out = STDIN.read
old_ref, sha1, ref_name = out.split

# Create build path
share_path = "#{SHARE_PATH}/homepage"
build_path = "#{BUILDS_PATH}/#{sha1}"
exec "mkdir -p #{build_path}"

# Checkout repository
puts "Ref #{ref_name} received. Building release in '#{build_path}'"
exec "git --work-tree=\"#{build_path}\" --git-dir=\"#{ENV['PWD']}\" checkout -f #{sha1}"

# Read pipeline
Dir.chdir build_path do
  pipeline = YAML.load(File.read('build.yml'))
  docker_args = [
    "--rm",
    "-v #{build_path}:/app",
    "-v #{share_path}:/data",
    "-w /app",
    pipeline['image']
  ].join(' ')

  # Iniitalize image
  puts "Pulling image: #{pipeline['image']}"
  exec "docker pull #{pipeline['image']}"

  # Run build
  pipeline['commands'].each do |cmd|
    exec "docker run  #{docker_args} #{cmd}"
  end
end

build.yml

image: registry.gitlab.com/dhiemstra/rails:2.3.4-node6
target: public
environment:
  LANG: C.UTF-8
commands:
  - curl -o /usr/local/bin/phraseapp -Ls https://github.com/phrase/phraseapp-client/releases/download/1.4.5/phraseapp_linux_386
  - chmod +x /usr/local/bin/phraseapp
  - bundle install --without development test staging
  - yarn install
  - /usr/local/bin/phraseapp pull
  - rake data:all --trace
  - npm rebuild node-sass
  - bundle exec middleman build -e production