namespace :git do

  def strategy
    @strategy ||= Capistrano::Git.new(self, fetch(:git_strategy, Capistrano::Git::DefaultStrategy))
  end

  set :git_environmental_variables, ->() {
    {
      :git_askpass => "/bin/echo",
      :git_ssh => "#{fetch(:tmp_dir)}/#{fetch(:application)}/git-ssh.sh"
    }
  }

  desc "Upload the git wrapper script, this script guarantees that we can script git without getting an interactive prompt"
  task :wrapper do
    on release_roles :all do
      execute :mkdir, "-p", "#{fetch(:tmp_dir)}/#{fetch(:application)}/"
      upload! StringIO.new("#!/bin/sh -e\nexec /usr/bin/ssh -o PasswordAuthentication=no -o StrictHostKeyChecking=no \"$@\"\n"), "#{fetch(:tmp_dir)}/#{fetch(:application)}/git-ssh.sh"
      execute :chmod, "+rx", "#{fetch(:tmp_dir)}/#{fetch(:application)}/git-ssh.sh"
    end
  end

  desc "Check that the repository is reachable"
  task :check => :'git:wrapper' do
    fetch(:branch)
    on release_roles :all do
      with fetch(:git_environmental_variables) do
        strategy.check
      end
    end
  end

  desc "Clone the repo to the cache"
  task :clone => :'git:wrapper' do
    on release_roles :all do
      if strategy.test
        info t(:mirror_exists, :at => repo_path)
      else
        within deploy_path do
          with fetch(:git_environmental_variables) do
            strategy.clone
          end
        end
      end
    end
  end

  desc "Update the repo mirror to reflect the origin state"
  task :update => :'git:clone' do
    on release_roles :all do
      within repo_path do
        with fetch(:git_environmental_variables) do
          strategy.update
        end
      end
    end
  end

  desc "Copy repo to releases"
  task :create_release => :'git:update' do
    on release_roles :all do
      with fetch(:git_environmental_variables) do
        within repo_path do
          execute :mkdir, "-p", release_path
          strategy.release
        end
      end
    end
  end

  desc "Determine the revision that will be deployed"
  task :set_current_revision do
    on release_roles :all do
      within repo_path do
        with fetch(:git_environmental_variables) do
          set :current_revision, strategy.fetch_revision
        end
      end
    end
  end
end