在我的本机上设置了环境了变量，Carrierwave 用到的 AWS KEY, 登录到 VPS 上在 .bashrc 里面也设置好了变量。 但， mina deploy 一直报错。

rake aborted!
       ArgumentError: Missing required arguments: aws_access_key_id, aws_secret_access_key
       /home/steven/ps.stevenwu.cn/tmp/build-14186476581958/vendor/bundle/ruby/2.1.0/gems/fog-core-1.27.1/lib/fog/core/service.rb:244:in `validate_options'
       /home/steven/ps.stevenwu.cn/tmp/build-14186476581958/vendor/bundle/ruby/2.1.0/gems/fog-core-1.27.1/lib/fog/core/service.rb:268:in `handle_settings'

CarrierWave.configure do |config|
  if Rails.env.staging? || Rails.env.production?
    config.storage = :fog
    config.fog_credentials = {
      :provider               => 'AWS',                        # required
      :aws_access_key_id      => ENV['AWS_ACCESS_KEY'],                        # required
      :aws_secret_access_key  => ENV['AWS_ACCESS_KEY'],                        # required
    }
    config.fog_directory  = 'steven-flix'                          # required
  else
    config.storage = :file
    config.enable_processing = Rails.env.development?
  end

试了这个，还是不行 https://github.com/mina-deploy/mina/issues/11