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Roper is a CLI tool used to help stage a Dockerized web app. It's name is a play on it's two main commands (lasso and release).

There are some assumptions made about the environment that roper runs in. The main one is that Traefik has been configured to run via the docker back-end and that the Dockerized web application uses a docker-compose.ym file that knows how to communicate with Traefik.

Another assumption made is that the repository for the web applications roper is concerned with lives at GitHub: At this point I have no intention of supporting another git repository service.

Once Roper is configured it knows how to:

  • Post to a GitHub branch PR with an in progress status for the stage site setup.
  • Pull in a repo locally.
  • Checkout a specific branch.
  • Start docker-compose session
  • Post back to GitHub branch PR with link for QA site or failure status.
  • When a PR is merged or closed the resources can be released/recovered.

Roper also defines the following environment variables which are made available during the docker-compose up phase and can therefore be referenced in your docker-compose.yml file

variable description
ROPER_REPO_OWNER The GitHub repository owner
ROPER_REPO_NAME The GitHub repository name
ROPER_REPO_BRANCH The GitHub repository branch

Currently, Roper only defines a CLI interface so there is no way for GitHub to communicate with it directly via a web-hook or whatnot. It's assumed that it will be used in conjunction with a service like Jenkins CI to handle the web-hook part of the communication and trigger a roper staging on a desired GitHub event (PR creation, update to PR, merge of PR).

Eventually it would be nice for Roper to include a web service interface that GitHub can post directly to. But then again, that might just be scope creep considering there are already good options for handling the web-hook concern (i.e. Jenkins)


Add this line to your application's Gemfile:

ruby gem 'roper'

And then execute:

$ bundle

Or install it yourself as:

$ gem install roper


roper lasso --repo=<user>/<repo> [--branch=<branch>] [--status_url=<url>]

roper release --repo=<user>/<repo>


You can use the individual components of the library as you wish.

Github Authentication

Currenlty Roper uses netrc for github authentication. I'm hoping to slap an interface to create this at setup but for now you will need to add a ~/.netrc file with an entry for manually.


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the 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


Bug reports and pull requests are welcome on GitHub at This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.


The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Roper project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.