The static code checks in Airflow are used to verify that the code meets certain quality standards. All the static code checks can be run through pre-commit hooks.
The pre-commit hooks perform all the necessary installation when you run them for the first time. See the table below to identify which pre-commit checks require the Breeze Docker images.
You can also run some static code checks via Breeze environment using available bash scripts.
Pre-commit hooks help speed up your local development cycle and place less burden on the CI infrastructure. Consider installing the pre-commit hooks as a necessary prerequisite.
The pre-commit hooks by default only check the files you are currently working on and make them fast. Yet, these checks use exactly the same environment as the CI tests use. So, you can be sure your modifications will also work for CI if they pass pre-commit hooks.
We have integrated the fantastic pre-commit framework in our development workflow. To install and use it, you need at least Python 3.7 locally.
It is the best to use pre-commit hooks when you have your local virtualenv for
Airflow activated since then pre-commit hooks and other dependencies are
automatically installed. You can also install the pre-commit hooks manually
using pip install.
pip install pre-commitAfter installation, pre-commit hooks are run automatically when you commit the code and they will
only run on the files that you change during your commit, so they are usually pretty fast and do
not slow down your iteration speed on your changes. There are also ways to disable the pre-commits
temporarily when you commit your code with --no-verify switch or skip certain checks that you find
to much disturbing your local workflow. See `Available pre-commit checks<#available-pre-commit-checks>`_
and Using pre-commit
Note
Additional prerequisites might be needed
The pre-commit hooks use several external linters that need to be installed before pre-commit is run.
Each of the checks installs its own environment, so you do not need to install those, but there are some
checks that require locally installed binaries. On Linux, you typically install
them with sudo apt install, on macOS - with brew install.
The current list of prerequisites is limited to xmllint:
- on Linux, install via
sudo apt install libxml2-utils - on macOS, install via
brew install libxml2
Some pre-commit hooks also require the Docker Engine to be configured as the static checks are executed in the Docker environment (See table in the Available pre-commit checks<#available-pre-commit-checks>`_ . You should build the images locally before installing pre-commit checks as described in BREEZE.rst.
Sometimes your image is outdated and needs to be rebuilt because some dependencies have been changed. In such cases, the Docker-based pre-commit will inform you that you should rebuild the image.
In case you do not have your local images built, the pre-commit hooks fail and provide instructions on what needs to be done.
To turn on pre-commit checks for commit operations in git, enter:
pre-commit installTo install the checks also for pre-push operations, enter:
pre-commit install -t pre-pushFor details on advanced usage of the install method, use:
pre-commit install --helpThis table lists pre-commit hooks used by Airflow. The Image column indicates which hooks
require Breeze Docker image to be build locally.
Note
Disabling particular checks
In case you have a problem with running particular pre-commit check you can still continue using the
benefits of having pre-commit installed, with some of the checks disabled. In order to disable
checks you might need to set SKIP environment variable to coma-separated list of checks to skip. For example
when you want to skip some checks (flake/mypy for example), you should be able to do it by setting
export SKIP=run-flake8,run-mypy. You can also add this to your .bashrc or .zshrc if you
do not want to set it manually every time you enter the terminal.
In case you do not have breeze image configured locally, you can also disable all checks that require
the image by setting SKIP_IMAGE_PRE_COMMITS to "true". This will mark the tests as "green" automatically
when run locally (note that those checks will anyway run in CI).
| ID | Description | Image |
|---|---|---|
| black | Run Black (the uncompromising Python code formatter) | |
| blacken-docs | Run black on python code blocks in documentation files | |
| check-airflow-2-2-compatibility | Check that providers are 2.2 compatible. | |
| check-airflow-config-yaml-consistent | Checks for consistency between config.yml and default_config.cfg | |
| check-apache-license-rat | Check if licenses are OK for Apache | |
| check-base-operator-partial-arguments | Check BaseOperator and partial() arguments | |
| check-base-operator-usage |
|
|
| check-boring-cyborg-configuration | Checks for Boring Cyborg configuration consistency | |
| check-breeze-top-dependencies-limited | Breeze should have small number of top-level dependencies | |
| check-builtin-literals | Require literal syntax when initializing Python builtin types | |
| check-changelog-has-no-duplicates | Check changelogs for duplicate entries | |
| check-core-deprecation-classes | Verify using of dedicated Airflow deprecation classes in core | |
| check-daysago-import-from-utils | Make sure days_ago is imported from airflow.utils.dates | |
| check-decorated-operator-implements-custom-name | Check @task decorator implements custom_operator_name | |
| check-docstring-param-types | Check that docstrings do not specify param types | |
| check-example-dags-urls | Check that example dags url include provider versions | |
| check-executables-have-shebangs | Check that executables have shebang | |
| check-extra-packages-references | Checks setup extra packages | |
| check-extras-order | Check order of extras in Dockerfile | |
| check-for-inclusive-language | Check for language that we do not accept as community | |
| check-hooks-apply | Check if all hooks apply to the repository | |
| check-incorrect-use-of-LoggingMixin | Make sure LoggingMixin is not used alone | |
| check-integrations-are-consistent | Check if integration list is consistent in various places | |
| check-lazy-logging | Check that all logging methods are lazy | |
| check-merge-conflict | Check that merge conflicts are not being committed | |
| check-newsfragments-are-valid | Check newsfragments are valid | |
| check-no-providers-in-core-examples | No providers imports in core example DAGs | |
| check-no-relative-imports | No relative imports | |
| check-persist-credentials-disabled-in-github-workflows | Check that workflow files have persist-credentials disabled | |
| check-pre-commit-information-consistent | Update information re pre-commit hooks and verify ids and names | |
| check-provide-create-sessions-imports | Check provide_session and create_session imports | |
| check-provider-yaml-valid | Validate providers.yaml files | |
| check-providers-init-file-missing | Provider init file is missing | |
| check-providers-subpackages-init-file-exist | Provider subpackage init files are there | |
| check-pydevd-left-in-code | Check for pydevd debug statements accidentally left | |
| check-revision-heads-map | Check that the REVISION_HEADS_MAP is up-to-date | |
| check-safe-filter-usage-in-html | Don't use safe in templates | |
| check-setup-order | Check order of dependencies in setup.cfg and setup.py | |
| check-start-date-not-used-in-defaults | 'start_date' not to be defined in default_args in example_dags | |
| check-system-tests-present | Check if system tests have required segments of code | |
| check-system-tests-tocs | Check that system tests is properly added | |
| check-xml | Check XML files with xmllint | |
| codespell | Run codespell to check for common misspellings in files | |
| compile-www-assets | Compile www assets | |
| compile-www-assets-dev | Compile www assets in dev mode | |
| create-missing-init-py-files-tests | Create missing init.py files in tests | |
| debug-statements | Detect accidentally committed debug statements | |
| detect-private-key | Detect if private key is added to the repository | |
| doctoc | Add TOC for md and rst files | |
| end-of-file-fixer | Make sure that there is an empty line at the end | |
| fix-encoding-pragma | Remove encoding header from python files | |
| flynt | Run flynt string format converter for Python | |
| identity | Print input to the static check hooks for troubleshooting | |
| insert-license |
|
|
| isort | Run isort to sort imports in Python files | |
| lint-chart-schema | Lint chart/values.schema.json file | |
| lint-css | stylelint | |
| lint-dockerfile | Lint dockerfile | |
| lint-helm-chart | Lint Helm Chart | |
| lint-javascript | ESLint against airflow/ui | |
| lint-json-schema |
|
|
| lint-markdown | Run markdownlint | |
| lint-openapi |
|
|
| mixed-line-ending | Detect if mixed line ending is used (r vs. rn) | |
| pretty-format-json | Format json files | |
| pydocstyle | Run pydocstyle | |
| python-no-log-warn | Check if there are no deprecate log warn | |
| pyupgrade | Upgrade Python code automatically | |
| replace-bad-characters | Replace bad characters | |
| rst-backticks | Check if RST files use double backticks for code | |
| run-flake8 | Run flake8 | |
| run-mypy |
|
|
| run-shellcheck | Check Shell scripts syntax correctness | |
| static-check-autoflake | Remove all unused code | |
| trailing-whitespace | Remove trailing whitespace at end of line | |
| ts-compile-and-lint-javascript | TS types generation and ESLint against current UI files | |
| update-breeze-cmd-output | Update output of breeze commands in BREEZE.rst | |
| update-breeze-readme-config-hash | Update Breeze README.md with config files hash | |
| update-extras | Update extras in documentation | |
| update-in-the-wild-to-be-sorted | Sort INTHEWILD.md alphabetically | |
| update-inlined-dockerfile-scripts | Inline Dockerfile and Dockerfile.ci scripts | |
| update-local-yml-file | Update mounts in the local yml file | |
| update-migration-references | Update migration ref doc | |
| update-providers-dependencies | Update cross-dependencies for providers packages | |
| update-setup-cfg-file | Update setup.cfg file with all licenses | |
| update-spelling-wordlist-to-be-sorted | Sort alphabetically and uniquify spelling_wordlist.txt | |
| update-supported-versions | Updates supported versions in documentation | |
| update-vendored-in-k8s-json-schema | Vendor k8s definitions into values.schema.json | |
| update-version | Update version to the latest version in the documentation | |
| yamllint | Check YAML files with yamllint | |
| yesqa | Remove unnecessary noqa statements |
After installation, pre-commit hooks are run automatically when you commit the code. But you can run pre-commit hooks manually as needed.
- Run all checks on your staged files by using:
pre-commit run- Run only mypy check on your staged files by using:
pre-commit run run-mypy- Run only mypy checks on all files by using:
pre-commit run run-mypy --all-files- Run all checks on all files by using:
pre-commit run --all-files- Run all checks only on files modified in the last locally available commit in your checked out branch:
pre-commit run --source=HEAD^ --origin=HEAD- Show files modified automatically by pre-commit when pre-commits automatically fix errors
pre-commit run --show-diff-on-failure- Skip one or more of the checks by specifying a comma-separated list of checks to skip in the SKIP variable:
SKIP=run-mypy,run-flake8 pre-commit run --all-filesYou can always skip running the tests by providing --no-verify flag to the
git commit command.
To check other usage types of the pre-commit framework, see Pre-commit website.
The static code checks can be launched using the Breeze environment.
You run the static code checks via breeze static-check or commands.
You can see the list of available static checks either via --help flag or by using the autocomplete
option.
Run the mypy check for the currently staged changes:
breeze static-checks --type run-mypyRun the mypy check for all files:
breeze static-checks --type run-mypy --all-filesRun the flake8 check for the tests.core.py file with verbose output:
breeze static-checks --type run-flake8 --file tests/core.py --verboseRun the flake8 check for the tests.core package with verbose output:
breeze static-checks --type run-flake8 --file tests/core/* --verboseRun all checks for the currently staged files:
breeze static-checksRun all checks for all files:
breeze static-checks --all-filesRun all checks for last commit :
breeze static-checks --last-commitThose commits that use Breeze docker image might sometimes fail, depending on your operating system and
docker setup, so sometimes it might be required to run debugging with the commands. This is done via
two environment variables VERBOSE and DRY_RUN. Setting them to "true" will respectively show the
commands to run before running them or skip running the commands.
Note that you need to run pre-commit with --verbose command to get the output regardless of the status of the static check (normally it will only show output on failure).
Printing the commands while executing:
VERBOSE="true" pre-commit run --verbose run-flake8Just performing dry run:
DRY_RUN="true" pre-commit run --verbose run-flake8