For those interested in contributing a package, we have created a set of guidelines for this process. Our goal is to unify the pipeline and collection of software and data packages for the Johns Hopkins Data Science Lab. We wish to alleviate some maintenance responsibilities from individual developers, while allowing for fast development and continued maintenance of packages that work together. We borrowed much of this material from this onboarding document.

Licensing: We expect code that we produce to be licensed under a license. Unless a funding agency requires something different, we will use this.

Version Control Services: Our primary version control service is GitHub, and we have a jhudsl account there ( We expect that contributors will maintain their code in repositories under this team account.

Creating a jhudsl Repository

  1. Create a repository under the team account
  2. Immediately fork this repository into one that your user account owns.
  3. Make commits to your own repository, and move code back to the jhudsl repository as described below.

Getting Code into jhudsl Repositories

Code moves from user repositories to jhudsl repositories through a process of code review. Code review is handled through pull requests. The process is described briefly below. Feel free to ask for guidance if you are uncomfortable with the process. We will revoke write access for failing to adhere to these rules.

  1. Make changes to your code and commit them in your own repository first. The master branch should reflect the current state of the project. These commits should consist of a complete fix, feature, or feature enhancement (e.g. If arguments of a function are changing, then the docs should change as well). The package should at all times be installable, pass basic checks (such as R CMD check, and be internally consistent.
  2. Create a pull request into the repository owned by jhudsl. The master branch is a good starting point for starting a pull request. We will have all pull requests checked by continuous integration.
  3. Name potential reviewers for your pull request by tagging individuals with the @ symbol in your pull request.
  4. Once at least one JHU DSL lab member has approved your pull request, you or a reviewer may merge your pull request.

Composition of Pull Requests

Each pull request may contain one or more changesets or commits. In keeping with good source control practice, each commit should contain all changes necessary for a particular fix or update. In addition, each pull request should relate to no more than one functional area in the code base you are updating. Keeping the pull request focused to one area makes it easier for your reviewers to provide thoughtful feedback.

Reviewing Pull Requests

We expect that all JHU DSL lab members will participate in review of pull requests. If you get named by the submitter, it’s courteous to review the request. We have created a checklist to facilitate review. As a reviewer, you are responsible for making sure that all checklist guidelines are followed.

Maintaining jhudsl Repositories