21 November 2012

In SAYS, we use capistrano-gitflow in our deployment recipe. It provides us with tagging and logging workflow. Made our life easier.

Currently I’m working on one of our client’s project. It require us to deploy on heroku. I would love to use the same deployment workflow that we use in SAYS. My initial plan was to write simple rake task to tag and push to heroku. Of course, I googled it up first, see how others approached deployment on heroku.

Most solutions that I found are using production/staging branch. Which is not what I wanted. That’s when I stumbled upon heroku_san. I remember reading about it but didn’t bother to test it out. There’s a good tutorial here. But I don’t use CI for this project, so I simplify it a bit.

I added tag to heroku.yml for production stage, staging remains the same.

  production:
    tag: staging/*
    ...

Then I just paste from the example to heroku.rake, I removed ci from STAGES.

  STAGES = %w[staging production]

  def create_and_push(stage)
    auto_tag = AutoTagger::Base.new(stages: STAGES, stage: stage, verbose: true, push_refs: false, refs_to_keep: 100)
    tag = auto_tag.create_ref(auto_tag.last_ref_from_previous_stage.try(:sha))
    sh "git push origin #{tag.name}"
    auto_tag.delete_locally
    auto_tag.delete_on_remote
  end
  
  task :before_deploy do
    sh "git fetch --tags"
  end
  
  task :after_deploy do
    each_heroku_app do |stage|
      create_and_push(stage.name)
    end
  end
  
  namespace :autotag do
    desc "Create an autotag for stage, default: #{STAGES.first}"
    task :create, :stage do |t, args|
      create_and_push(args[:stage] || STAGES.first)
    end
  end

That’s it. rake staging deploy will deploy to staging, then tag it with staging/datetime. rake production deploy will deploy anything tagged as staging/\*.