To make releases, you will need
The twine package.
An account on PyPI.
Collaborator status on Baseband’s repository at
mhvk/basebandto push new branches.
An account on Read the Docs that has access to Baseband.
Optionally, a GPG signing key associated with your GitHub account. While releases do not need to be signed, we recommend doing so to ensure they are trustworthy. To make a GPG key and associate it with your GitHub account, see the Astropy documentation.
Baseband follows the semantic versioning specification:
majornumber represents backward incompatible API changes.
minornumber represents feature updates to last major version.
patchnumber represents bugfixes from last minor version.
Major and minor versions have their own release branches on GitHub that end
with “x” (eg.
v1.1.x), while specific releases are tagged
commits within their corresponding branch (eg.
tagged commits within
The first two steps of the release procedure are different for major and minor releases than it is for patch releases. Steps specifically for major/minor releases are labelled “m”, and patch ones labelled “p”.
1m. Preparing major/minor code for release¶
We begin in the main development branch (the local equivalent to
mhvk/baseband:master). First, check the following:
Ensure tests pass. Run the test suite by running
tox -e testin the Baseband root directory.
CHANGES.rst. All merge commits to master since the last release should be documented (except trivial ones such as typo corrections). Since
CHANGES.rstis updated for each merge commit, in practice it is only necessary to change the date of the release you are working on from “unreleased” to the current date.
Add authors and contributors to
.zenodo.json. To list contributors, one can use:
git shortlog -n -s -e
This will also list contributors to astropy-helpers and the astropy template, who should not be added. If in doubt, cross-reference with the authors of pull requests.
git add any changes and make a commit:
git commit -m "Finalizing changelog and author list for v<version>"
For major/minor releases, the patch number is
Submit the commit as a pull request to master.
Make and enter a new release branch:
git checkout -b v<version branch>.x
1p. Cherry-pick code for a patch release¶
We begin by checking out the appropriate release branch:
git checkout v<version branch>.x
Bugfix merge commits are backported to this branch from master by way of
cherry-pick. First, find the SHA hashes of the relevant merge commits in the
main development branch. Then, for each:
git cherry-pick -m 1 <SHA-1>
For more information, see Astropy’s documentation.
Once you have cherry-picked, check the following:
Ensure tests pass and documentation builds. Run the test suite by running
tox -e test, and build documentation by running
tox -e build_docs, in the Baseband root directory.
CHANGES.rst. Typically, merge commits record their changes, including any backported bugfixes, in
CHANGES.rst. Cherry-picking should add these records to this branch’s
CHANGES.rst, but if not, manually add them before making the commit (and manually remove any changes not relevant to this branch). Also, change the date of the release you are working on from “unreleased” to the current date.
Commit your changes:
git commit -m "Finalizing changelog for v<version>"
2. Tag the release¶
Tag the commit made in step 1 as:
git tag -s v<version> -m "Tagging v<version>"
3. Clean and package the release¶
Checkout the tag:
git checkout v<version>
Clean the repository:
git clean -dfx
and ensure the repository has the proper permissions:
umask 0022 chmod -R a+Xr .
Finally, package the release’s source code:
python3 setup.py build sdist
4. Test the release¶
We now test installing and running Baseband in clean virtual environments, to
ensure there are no subtle bugs that come from your customized development
environment. Before creating the virtualenvs, we recommend checking if the
$PYTHONPATH environmental variable is set. If it is, set it to a null
value (in bash,
PYTHONPATH=) before proceeding.
To create the environments:
python3 -m venv test_release
Now, for each environment, activate it, navigate to the Baseband root directory, and run the tests:
source test_release/bin/activate pip install dist/baseband-*.tar.gz pip install pytest-astropy cd ~/ python -c 'import baseband; baseband.test()' deactivate cd -
If the test suite raises any errors (at this point, likely dependency issues), delete the release tag:
git tag -d v<version>
For a major/minor release, delete the
v<version branch>.x branch as well.
Then, make the necessary changes directly on the main development branch. Once
the issues are fixed, repeat steps 2 - 6.
If the tests succeed, you may optionally re-run the cleaning and packaging code above following the tests:
git clean -dfx umask 0022 chmod -R a+Xr . python3 setup.py build sdist
You may optionally sign the source as well:
gpg --detach-sign -a dist/baseband-*.tar.gz
5. Publish the release on GitHub¶
If you are working a major/minor release, first push the branch to upstream
(assuming upstream is
git push upstream v<version branch>.x
Push the tag to GitHub as well:
git push upstream v<version>
Go to the
mhvk/baseband Releases section and check the Tags part. To
publish a release, click on the
... on the right for the tag you just pushed.
This takes you to a form where you can customize the release title and description.
Leave the title blank, in which case it is set to “v<version>”; for
the description, paste in the relevant parts of
Finally, click on “Publish release”. This takes you back to Releases.
6. Build the release wheel for PyPI¶
To build the release:
python3 setup.py bdist_wheel --universal
7. (Optional) test uploading the release¶
PyPI provides a test environment to safely try uploading new releases. To take advantage of this, use:
twine upload --repository-url https://test.pypi.org/legacy/ dist/baseband-<version>*
To test if this was successful, create a new virtualenv as above:
virtualenv --no-site-packages --python=python3 pypitest
pip install pytest-astropy comes first because
test.pypi does not
contain recent versions of Astropy):
source <name_of_virtualenv>/bin/activate pip install pytest-astropy pip install --index-url https://test.pypi.org/simple/ baseband python -c 'import baseband; baseband.test()' deactivate
8. Upload to PyPI¶
Finally, upload the package to PyPI:
twine upload dist/baseband-<version>*
9. Check if Readthedocs has updated¶
Go to Read the Docs and check that the
stable version points to the latest stable release. Each minor release has
its own version as well, which should be pointing to its latest patch release.
10m. Clean up master¶
In the main development branch, add the next major/minor release to
CHANGES.rst. Make a commmit:
git commit -m "Add v<next major/minor version> to the changelog."
Then submit a pull request to master.
10p. Update CHANGES.rst on master¶
Change the release date of the patch release in
CHANGES.rst on master to
the current date, then:
git commit -m "Added release date for v<version> to the changelog."
git cherry-pick the changelog fix from the release branch
back to the main development one.)
Then submit a pull request to master.