mb-ppq
Last Updated: November 02, 2017
·
371
· lukom
B8f0151689d924b68dfee734ffab20f0

Capistrano deploy lock

As our team grew, we needed script to resolve simultaneous deploy conflicts with capistrano.
I found several gems for that: capistranodeploylock and caplock but they are for capistrano 2.
So I extracted code from caplock and adapted for capistrano 3:

# lib/capistrano/tasks/deploy_lock.rake
namespace :lock do
  desc 'check lock'
  task :check do
    on roles(:db) do
      if test("[ -f #{lock_path} ]")
        require 'time'
        lock_mtime = Time.parse capture("stat --format '%z' #{lock_path}")
        time_now = Time.parse capture('date')
        time_diff = Time.at(time_now - lock_mtime).utc.strftime('%H:%M:%S')
        deploy_user = capture("cat #{lock_path}").strip
        raise StandardError.new <<~MSG
          \n\n\e[31mDeployment is already in progress
          Started #{time_diff} ago by #{deploy_user}
          Run 'cap <stage> lock:release' if previous deploy was terminated\e[0m\n
        MSG
      end
    end
  end

  desc 'create lock'
  task :create do
    on roles(:db) do
      deploy_user = `git config user.name`.strip
      execute "echo '#{deploy_user}' > #{lock_path}"
    end
  end

  desc 'release lock'
  task :release do
    on roles(:db) do
      execute "rm #{lock_path}"
    end
  end

  def lock_path
    "#{shared_path}/cap.lock"
  end
end

before 'deploy:starting', 'lock:check'
after 'lock:check', 'lock:create'
after 'deploy:finished', 'lock:release'

Now when someone will try to deploy while deploying he will see this:

capistrano-lock-output.png

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