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* Added Doxygen life-cycle examples for different modules.

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How to contribute to HDF5

The HDF Group encourages community members to contribute to the HDF5 project. We accept and are very grateful for any contributions, from minor typos and bug fixes to new features. The HDF Group is committed to work with the code contributors and make contribution process enjoyable and straightforward.

This document describes guiding principles for the HDF5 code contributors and does not pretend to address any possible contribution. If in doubt, please do not hesitate to ask us for guidance. Note that no contribution may be accepted unless the donor agrees with the HDF Group software license terms found in the COPYING file in every branch's top source directory.

We will assume that you are familiar with git and GitHub. If not, you may go through the GitHub tutorial found at https://guides.github.com/activities/hello-world/. This tutorial should only take around 10 minutes.

Table of Contents

Workflow

The process for contributing code to HDF5 is as follows:

This step is required unless the change is minor (e.g., typo fix).

  • Fork the HDF5 repository.
  • Make the desired changes to the HDF5 software.
    • New features should always go to develop branch first and later should be merged to the appropriate maintenance branches.
    • Bug fixes should go to all appropriate branches (develop and maintenance).
  • Build and test your changes. Detailed instructions on building and testing HDF5 can be found in the INSTALL* files in the release_docs directory.
  • Push your changes to GitHub.
  • Issue a pull request and address any code formatting and testing issues reported.

Once a pull request is correctly formatted and passes ALL CI tests, it will be reviewed and evaluated by The HDF Group developers and HDF5 community members who can approve pull requests. The HDF Group developers will work with you to ensure that the pull request satisfies the acceptance criteria described in the next section.

Acceptance criteria for a pull request

We appreciate every contribution we receive, but we may not accept them all. Those that we do satisfy the following criteria:

  • The pull request has a clear purpose - What does the pull request address? How does it benefit the HDF5 community? If the pull request does not have a clear purpose and benefits, it will not be accepted.

  • The pull request is documented - The HDF5 developers must understand not only what a change is doing, but how it is doing it. Documenting the code makes it easier for us to understand your patch and maintain the code in the future.

  • The pull request passes HDF5 regression testing - Any issue fixed or functionality added should be accompanied by the corresponding tests and pass HDF5 regression testing run by The HDF Group. We do not expect you to perform comprehensive testing across multiple platforms before we accept the pull request. If the pull request does not pass regression testing after the merge, The HDF Group developers will work with you on the fixes.

  • The pull request does not compromise the principles behind HDF5 - HDF5 has a 100% commitment to backward compatibility.

    • Any file ever created with HDF5 must be readable by any future version of HDF5. If your patch's purpose is to modify the HDF5 data model or file format, please discuss this with us first. File format changes and features required by those changes can be introduced only in a new major release.
    • HDF5 has a commitment to remaining machine-independent; data created on one platform/environment/architecture must remain readable by HDF5 on any other.
    • For binary compatibility, no changes are allowed to public APIs and data structures in the maintenance releases; new APIs can be added.

  • New features are documented - Any new features should have proper documentation; talk to us if you have any questions.

Checklist

Please make sure that you check the items applicable to your pull request:

  • Code
    • Does the pull request have a corresponding GitHub issue and clear purpose?
    • Does the pull request follow HDF5 best practices (naming conventions, code portability, code structure, etc.)? <<TODO: link to the document>>
    • If changes were done to Autotools build, were they added to CMake and vice versa?
    • Is the pull request applicable to any other branches? If yes, which ones? Please document it in the GitHub issue.
    • Is the new code sufficiently documented for future maintenance?
    • Does the new feature require a change to an existing API? See "API Compatibility Macros" document (https://portal.hdfgroup.org/display/HDF5/API+Compatibility+Macros)
  • Documentation
    • Was the change described in the release_docs/RELEASE.txt file?
    • Was MANIFEST updated if new files had been added to the source?
    • Was the new function documented in the corresponding public header file using Doxygen?
    • Was new functionality documented for the HDF5 community (the level of documentation depends on the feature; ask us what would be appropriate)
  • Testing
    • Does the pull request have tests?
    • Does the pull request affect HDF5 library performance?

We want as many contributions as we can get, and we are here to help. Feel free to reach out to us if you have any questions

Thank you for your contribution!