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Contributor's Agreement

You are under no obligation whatsoever to provide any bug fixes, patches, or upgrades to the features, functionality or performance of the source code ("Enhancements") to anyone; however, if you choose to make your Enhancements available either publicly, or directly to the project, without imposing a separate written license agreement for such Enhancements, then you hereby grant the following license: a non-exclusive, royalty-free perpetual license to install, use, modify, prepare derivative works, incorporate into other computer software, distribute, and sublicense such enhancements or derivative works thereof, in binary and source code form.


When contributing to Singularity, it is important to properly communicate the gist of the contribution. If it is a simple code or editorial fix, simply explaining this within the GitHub Pull Request (PR) will suffice. But if this is a larger fix or Enhancement, you are advised to first discuss the change with the project leader or developers.

Please note we have a code of conduct, described below. Please follow it in all your interactions with the project members and users.

Pull Requests (PRs)

  1. Essential bug fix PRs should be sent to both master and release branches.
  2. Small bug fix and feature enhancement PRs should be sent to master only.
  3. Follow the existing code style precedent, especially for C. For Golang, you will mostly conform to the style and form enforced by the "go fmt" and "golint" tools for proper formatting.
  4. Ensure any install or build dependencies are removed before doing a build to test your PR locally.
  5. For any new functionality, please write appropriate go tests that will run as part of the Continuous Integration (Circle CI and Travis) systems.
  6. Make sure that the project's default copyright and header have been included in any new source files.
  7. Make sure you have locally tested using make test and that all tests succeed before submitting the PR.
  8. To conform to the Golang standards and idioms, make sure you have done the following:
    • Run go fmt ./... to format all .go files. We use go1.11's formatting as our standard
    • Left a function comment on every new exported function and package that your PR has introduced. To learn about how to properly comment Golang code, read this post on
    • Run make check to perform static analysis on the code
  9. Is the code human understandable? This can be accomplished via a clear code style as well as documentation and/or comments.
  10. The pull request will be reviewed by others, and finally merged when all requirements are met.
  11. The must be updated for any of the following changes:
    • Renamed commands
    • Deprecated / removed commands
    • Changed defaults / behaviors
    • Backwards incompatible changes
    • New features / functionalities
  12. PRs which introduce a new Golang dependency to the project via dep must include a justification for introducing the dependency. Ideally, newly introduced dependencies should also be pinned to a specific version.


There are a few places where documentation for the Singularity project lives. The changelog is where PRs should include documentation if necessary. When a new release is tagged, the user-docs and admin-docs will be updated using the contents of the file as reference.

  1. The changelog is a place to document functional differences between versions of Singularity. PRs which require documentation must update this file. This should be a document which can be used to explain what the new features of each version of Singularity are, and should not read like a commit log. Once a release is tagged (e.g. v3.0.0), a new top level section will be made titled Changes Since vX.Y.Z (e.g. Changes Since v3.0.0) where new changes will now be documented, leaving the previous section immutable.
  2. The README is a place to document critical information for new users of Singularity. It should typically not change, but in the case where a change is necessary a PR may update it.
  3. The user-docs should document anything pertinent to the usage of Singularity.
  4. The admin-docs document anything that is pertinent to a system administrator who manages a system with Singularity installed.
  5. If necessary, changes to the message displayed when running singularity help * can be made by editing docs/content.go.

Code of Conduct

Our Pledge

In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.

Our Standards

Examples of behavior that contributes to creating a positive environment include:

  • Using welcoming and inclusive language
  • Being respectful of differing viewpoints and experiences
  • Gracefully accepting constructive criticism
  • Focusing on what is best for the community
  • Showing empathy towards other community members

Examples of unacceptable behavior by participants include:

  • The use of sexualized language or imagery and unwelcome sexual attention or advances
  • Trolling, insulting/derogatory comments, and personal or political attacks
  • Public or private harassment
  • Publishing others' private information, such as a physical or electronic address, without explicit permission
  • Other conduct which could reasonably be considered inappropriate in a professional setting

Our Responsibilities

Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.

Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.


This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.


Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project leader ( All complaints will be reviewed and investigated and will result in a response that is deemed necessary and appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.

Project maintainers, contributors and users who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions with their involvement in the project as determined by the project's leader(s).


This Code of Conduct is adapted from the Contributor Covenant, version 1.4, available at

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