pyodide/docs/development/maintainers.md

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(maintainer-information)=
# Maintainer information
## Making a release
For branch organization we use a variation of the [GitHub
Flow](https://guides.github.com/introduction/flow/) with
the latest release branch named `stable` (due to ReadTheDocs constraints).
(release-instructions)=
### Release Instructions
1. From the root directory of the repository run
```bash
./tools/bump_version.py --new-version <new_version>
# ./tools/bump_version.py --new_version <new_version> --dry-run
```
and check that the diff is correct with `git diff`. Try using `ripgrep` to
make sure there are no extra old versions lying around e.g., `rg -F "0.18"`,
`rg -F dev0`, `rg -F dev.0`.
2. Make sure the change log is up-to-date. (Skip for alpha releases.)
- Indicate the release date in the change log.
- Generate the list of contributors for the release at the end of the
changelog entry with,
```bash
git shortlog -s LAST_TAG.. | cut -f2- | grep -v '\[bot\]' | sort --ignore-case | tr '\n' ';' | sed 's/;/, /g;s/, $//' | fold -s
```
where `LAST_TAG` is the tag for the last release.
3. Make a PR with the updates from steps 1 and 2. Merge the PR.
4. (Major release only.) Assuming the upstream `stable` branch exists,
rename it to a release branch for the previous major version. For instance if
last release was, `0.20.0`, the corresponding release branch would be
`0.20.X`,
```bash
git fetch upstream
git checkout stable
git checkout -b 0.20.X
git push upstream 0.20.X
git branch -D stable # delete locally
```
5. Create a tag `X.Y.Z` (without leading `v`) and push
it to upstream,
```bash
git tag X.Y.Z
git push upstream X.Y.Z
```
Wait for the CI to pass and create the release on GitHub.
6. (Major release only). Create a new `stable` branch from this tag,
```bash
git checkout -b stable
git push upstream stable --force
```
7. Revert the release commit. If making a major release, increment the version
to the next development version specified by Semantic Versioning.
```sh
# If you just released 0.22.0, then set the next version to 0.23.0
./tools/bump_version.py --new-version 0.23.0.dev0
```
8. Update these instructions with any relevant changes.
### Making a minor release
For a minor release, commits need to be added to the `stable` branch, ideally via a PR.
This can be done with either,
- git cherry picking individual commits,
```bash
git checkout stable
git pull
git checkout -b backport-branch
git cherry-pick <commit-hash>
```
- or with interactive rebase,
```bash
git fetch upstream
git checkout stable
git pull
git checkout -b backport-branch
git rebase -i upstream/main
```
and indicate which commits to take from `main` in the UI.
Then follow the relevant steps from {ref}`release-instructions`.
### Making an alpha release
Name the first alpha release `x.x.xa1` and in subsequent alphas increment the
final number. Follow the relevant steps from {ref}`release-instructions`.
### Fixing documentation for a released version
Cherry pick the corresponding documentation commits to the `stable` branch. Use
`[skip ci]` in the commit message.
### Upgrading pyodide to a new version of CPython
Prerequisites -- The desired version of CPython must be available at:
1. The `specific release` section of https://www.python.org/downloads
2. https://hub.docker.com/_/python
3. https://github.com/actions/python-versions/releases
For example: `v3.11.1` -> `v3.11.2`
A project maintainer must create a up-to-date Docker image:
1. In upstream (not a fork) change the Python version at the top of `Dockerfile` to the new version.
2. Click `Run workflow` on https://github.com/pyodide/pyodide/actions/workflows/docker_image.yml
- This will build and upload a new Docker image to https://hub.docker.com/r/pyodide/pyodide-env/tags
3. Re-tag that image with the correct browser and Python versions: `20230301-chrome109-firefox109-py311`
4. Open a new issue for a interested contributor to execute the following tasks...
Any contributor can complete the Python upgrade:
1. Ensure that the new Docker image has been tagged at https://hub.docker.com/r/pyodide/pyodide-env/tags
2. Download the **Gzipped source tarball** at https://www.python.org/downloads/release/python-3112 into `downloads/`
3. `shasum -a 256 downloads/Python-3.11.2.tgz > cpython/checksums`
- Ensure the path in `cpython/checksums` starts with `downloads/Python-`
4. `git grep --name-only "3.11.1" ` # All of these files will need to be updated.
5. In `.circleci/config.yml` modify the image name to match the image tag on Docker Hub.
- `image: pyodide/pyodide-env:20230301-chrome109-firefox109-py311`
6. In `run_docker` modify the `PYODIDE_IMAGE_TAG` to match the image tag on Docker Hub.
- `PYODIDE_IMAGE_TAG="20230301-chrome109-firefox109-py311"`
7. Rebase any patches which do not apply cleanly.
8. Create a pull request and fix any failing tests. This may be complicated for non-micro releases of CPython.