Rake tasks for Terraform

Rakefile

task :environment do
  errors = []
  %w(
    TF_VAR_dnsimple_email
    TF_VAR_dnsimple_token
    AWS_ACCESS_KEY_ID
    AWS_SECRET_ACCESS_KEY
    AWS_DEFAULT_REGION
  ).each do |name|
    errors << name if ENV[name].nil?
  end

  if errors.any?
    abort "One or more environment variables are empty: #{errors.join(", ")}"
  end
end

task :configure => :environment do
  bucket = "example-terraform-state"
  key = "terraform.tfstate"
  sh %Q!terraform remote config -backend=S3 -backend-config="bucket=#{bucket}" -backend-config="key=#{key}"!
end

task :pull => :configure do
  sh "terraform remote pull"
end

task :push => :configure do
  sh "terraform remote push"
end

task :plan do
  sh "terraform plan"
end

task :apply do
  sh "terraform apply"
end

Rake::Task[:plan].enhance([:pull])

Rake::Task[:apply].enhance([:pull]) do
  Rake::Task[:push].invoke
end

task :default => :plan