Contributing to conda-build

New Issues

If your issue is a bug report or a feature request for:

Code of Conduct

The conda organization adheres to the NumFOCUS Code of Conduct.


Contributions to conda-build are always welcome! Please fork the conda/conda-build repository, and submit a pull request (PR).

If a PR is a work in progress, please put [WIP] in the title. Contributions are expected to pass flake8 and test suites run on the GitHub Actions Pipeline. Contributors also need to have signed our Contributor License Agreement.

Setting Up Your Environment

There are two ways to set up your environment for development/testing. The first is to reuse your base environment; this is probably the easiest option but comes with the risk of potentially breaking conda/conda-build. The second option is to create a development environment where we install conda/conda-build, which won’t impact the functionality of conda/conda-build installed in your base environment.

Using the Base Environment:

    # activate/install into base env
    $ conda activate base
    (base) $ conda install --file tests/requirements.txt --channel defaults

    # run tests
    (base) $ pytest

    # install as editable so you can play around with it
    (base) $ pip install -e .
    (base) $ conda-build --version
    conda-build 3.21.5+17.gcde7b306

Creating a Development Environment:

    # create/activate standalone dev env
    $ CONDA_ENV=conda-build make setup
    $ conda activate conda-build

    # Run all tests on Linux and Mac OS X systems (this can take a long time)
    (conda-build) $ make test

    # install as editable so you can play around with it
    (conda-build) $ pip install -e .
    (conda-build) $ conda-build --version
    conda-build 3.21.5+17.gcde7b306


Running our test suite requires cloning one other repo at the same level as conda-build: - this is necessary for relative path tests outside of conda-build’s build tree.

Follow the installation instructions above to properly set up your environment for testing.

The test suite runs with pytest. The following are some useful commands for running specific tests, assuming you are in the conda-build root folder:

Run all tests:

    # On Linux and Mac OS X
    make test

Run one test file:

    pytest tests/

Run one test function:

    pytest tests/

Run one parameter of one parametrized test function:

Several tests are parametrized, to run some small change, or build several recipe folders. To choose only one of them::

    pytest tests/[entry_points]

Note that our tests use pytest fixtures extensively. These sometimes trip up IDE style checkers about unused or redefined variables. These warnings are safe to ignore.


Releases of conda-buildmay be performed via the rever command. Rever is configured to perform the activities for a typical conda-build release. To cut a release, simply run rever <X.Y.Z> where <X.Y.Z> is the release number that you want bump to. For example, rever 1.2.3. However, it is always good idea to make sure that the you have permissions everywhere to actually perform the release. So it is customary to run rever check before the release, just to make sure. The standard workflow is thus:

    rever check
    rever 1.2.3

If for some reason a release fails partway through, or you want to claw back a release that you have made, rever allows you to undo activities. If you find yourself in this pickle, you can pass the --undo option a comma-separated list of activities you’d like to undo. For example:

    rever --undo tag,changelog,authors 1.2.3

Happy releasing!