Permafrost

Freeze the environment (i.e. ENV) in a limited scope.

Inspired by Timecop.

Add this line to your application's Gemfile:

gem "permafrost", "~> 1.0"

And then execute:

$ bundle install

Or install it yourself as:

$ gem install permafrost

Freeze the environment, and change it at will inside a sandbox:

ENV # { "RAILS_ENV" => "production", ... }

Permafrost.freeze do
  ENV.clear # {}
end

ENV # { "RAILS_ENV" => "production", ... }

Or, set the environment to use inside the sandbox:

ENV # { "RAILS_ENV" => "production", ... }

Permafrost.freeze("foo" => "bar") do
  ENV # { "foo" => "bar" }
end

ENV # { "RAILS_ENV" => "production", ... }

You can also just change something in the environment, leaving the rest as it is:

ENV # { "RAILS_ENV" => "production", ... }

Permafrost.merge("foo" => "bar") do
  ENV # { "RAILS_ENV" => "production", ..., "foo" => "bar" }
end

ENV # { "RAILS_ENV" => "production", ... }

After checking out the repo, run bin/setup to install dependencies. Then, run rake to run the linter and tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/subvisual/permafrost.

Permafrost is copyright © 2020 Subvisual, Lda.

It is open-source, made available for free, and is subject to the terms in its license.

Permafrost was created and is maintained with ❤️ by Subvisual.