jbampton opened a new issue, #2202: URL: https://github.com/apache/sedona/issues/2202
A quick example which I created for `mruby` here: https://github.com/mruby/mruby/blob/8e074f185bd940f7dd52e3296f3c9bf70c830ba4/Dockerfile#L11 Apache Airflow uses Docker and pre-commit Airflow has 1700 lines of code in their pre-commit config: https://github.com/apache/airflow/blob/main/.pre-commit-config.yaml And now what Google Gemini says about it. Gemini can make mistakes, so double-check it. Installing pre-commit hooks *inside* a Docker container usually means one of two things: 1. **You want `pre-commit` to run as part of your CI/CD pipeline within a Docker image.** In this scenario, the Docker container is the environment where the hooks will execute to validate your code. 2. **You want to set up your development environment to run `pre-commit` hooks locally, but your development setup itself is Dockerized (e.g., using Docker Compose or a devcontainer).** This is a bit more nuanced, as `pre-commit` typically interacts with your local Git repository. Let's break down both scenarios: ## Scenario 1: Installing Pre-Commit Hooks for CI/CD within a Docker Container This is the more common and straightforward approach. You include `pre-commit` and your configuration in your Dockerfile so that your automated checks can run reliably. **Steps:** 1. **Create your `.pre-commit-config.yaml`:** Make sure you have a `.pre-commit-config.yaml` file at the root of your project. This file defines which hooks to run. ```yaml # .pre-commit-config.yaml repos: - repo: https://github.com/pre-commit/pre-commit-hooks rev: v4.6.0 # Use the latest stable version hooks: - id: trailing-whitespace - id: end-of-file-fixer - id: check-yaml - id: check-added-large-files - repo: https://github.com/psf/black rev: 24.4.2 # Use the latest stable version hooks: - id: black # Add other hooks as needed (e.g., for Python, JavaScript, etc.) ``` 2. **Add `pre-commit` installation to your Dockerfile:** You'll need to install `pre-commit` and then "install" the hook environments. The `pre-commit install-hooks` command will download and set up the necessary tools for the hooks defined in your `.pre-commit-config.yaml`. ```dockerfile # Dockerfile # Use an appropriate base image for your project FROM python:3.9-slim-buster # Set working directory WORKDIR /app # Copy your project files, including .pre-commit-config.yaml COPY . /app/ # Install pre-commit RUN pip install pre-commit # Initialize a dummy Git repository and install hook environments # This is crucial for pre-commit to cache the hook executables # The `rm -rf .git` ensures this temporary repo doesn't affect your main repo. RUN git init . && pre-commit install-hooks && rm -rf .git # You can now run pre-commit against your files # For CI, you'd typically run it as part of a build script or directly in the Dockerfile # Example for a CI step: CMD ["/usr/local/bin/pre-commit", "run", "--all-files"] # If your app needs to run, add your usual entrypoint/cmd here # ENTRYPOINT ["python", "your_app.py"] ``` **Explanation of `RUN git init . && pre-commit install-hooks && rm -rf .git`:** * `git init .`: `pre-commit` needs a Git repository to set up its hooks and cache environments. We create a temporary one. * `pre-commit install-hooks`: This command processes your `.pre-commit-config.yaml` and downloads/installs the tools required by your hooks into `~/.cache/pre-commit` within the container. This makes your Docker image self-contained with all the necessary hook dependencies. * `rm -rf .git`: After `pre-commit` has set up its environments, the temporary `.git` directory is no longer needed for the image itself, so we remove it to keep the image clean. 3. **Run `pre-commit` in your CI/CD pipeline:** In your CI/CD configuration (e.g., GitHub Actions, GitLab CI, Jenkins), you would build this Docker image and then execute `pre-commit run --all-files` within a container spun up from this image. Example (conceptual CI step): ```bash docker build -t my-project-linted . docker run my-project-linted pre-commit run --all-files ``` If `pre-commit run --all-files` exits with a non-zero status (meaning hooks failed), your CI pipeline will fail, indicating a code quality issue. ## Scenario 2: Running Pre-Commit Hooks in a Dockerized Local Development Environment This is more complex because `pre-commit` usually needs to interact directly with your host machine's Git repository. There are a few approaches, each with pros and cons: ### Option A: Install `pre-commit` on the Host (Recommended for Local Dev) This is generally the simplest and most robust way to use `pre-commit` for local development, even if your application runs in Docker. 1. **Install `pre-commit` on your host machine:** ```bash pip install pre-commit # Or using your system's package manager, e.g., brew install pre-commit on macOS ``` 2. **Navigate to your project root and run:** ```bash pre-commit install ``` This creates the necessary Git hooks in your `.git/hooks` directory. 3. **Ensure hooks have access to necessary tools:** If your `pre-commit` hooks rely on tools that are only installed inside your Docker container (e.g., a specific Python version, a linter, or formatter), you have a few choices: * **Install those tools on your host machine as well.** (Simplest for common tools). * **Use `language: docker_image` hooks in your `.pre-commit-config.yaml`:** This allows `pre-commit` to run a specific hook inside a Docker image. This can be complex to set up, but ensures consistency. You'd need to define the Docker image and entry point for that hook. * **Manually modify your `pre-commit` hook script:** You could theoretically modify the `.git/hooks/pre-commit` script to execute a Docker command that runs the actual linter/formatter inside your development container. This is generally discouraged as it deviates from `pre-commit`'s standard usage and can be brittle. **Why this is often preferred:** * `pre-commit` is designed to run locally on your Git repository. * It provides immediate feedback before you even commit. * Avoids complexities of Docker-in-Docker or mounting Git directories. ### Option B: Running `pre-commit` within a Development Container (e.g., VS Code Dev Containers) If your *entire* development environment, including Git operations, happens inside a Docker container (like with VS Code Dev Containers), then installing `pre-commit` inside that container makes sense. 1. **Add `pre-commit` installation to your Dev Container's Dockerfile or `devcontainer.json`:** You'd follow steps similar to the CI/CD scenario, making sure `pre-commit` and its hook environments are set up when the dev container builds. Example in a `devcontainer.json` for VS Code: ```json { "name": "My Project", "dockerFile": "Dockerfile", "mounts": [ "source=${localWorkspaceFolder},target=/workspace,type=bind" ], "postCreateCommand": "pre-commit install", // This runs after the container is created "postStartCommand": "pre-commit install --install-hooks" // Can also run on start if needed } ``` And in your `Dockerfile` for the dev container: ```dockerfile FROM python:3.9-slim-buster WORKDIR /workspace COPY . /workspace/ RUN pip install pre-commit # No need for `git init` and `rm -rf .git` here if the .git directory is mounted from host ``` The key is that the `.git` directory from your host machine is mounted into the container, allowing `pre-commit` to set up the hooks directly within that mounted Git repository. ### Option C: Running `pre-commit` via `docker run` or `docker-compose exec` This is less about "installing" hooks inside the container, and more about *running* the `pre-commit` command using your container's environment. You would typically do this manually or integrate it into a wrapper script. 1. **Ensure `pre-commit` is installed in your Docker image (as in Scenario 1).** 2. **Manually execute the checks:** ```bash docker-compose run --rm my_service pre-commit run --all-files ``` Or if you just have a Dockerfile: ```bash docker build -t my_linter_image . # Build the image with pre-commit installed docker run -v $(pwd):/app my_linter_image pre-commit run --all-files ``` This is useful for ad-hoc checks or for a custom script that integrates with your local `git commit` process, but it's not the typical way `pre-commit install` works. ## Key Considerations: * **Caching:** `pre-commit` caches its hook environments. When building a Docker image for CI/CD, running `pre-commit install-hooks` during the build process pre-populates this cache, making subsequent `pre-commit run` commands faster and independent of external network access at runtime. * **Git Repository:** `pre-commit` needs access to a Git repository. For CI/CD, you typically copy your code into the container, and then `git init` a temporary repo. For local dev, you usually mount your host's Git repo. * **Performance:** For local development, running `pre-commit` directly on your host is often faster than spinning up Docker containers for each check. * **Consistency:** Using `pre-commit` ensures that all developers and CI/CD pipelines use the exact same code quality checks, regardless of their local setup. Choose the method that best fits your workflow and the needs of your team. For CI/CD, embedding `pre-commit` in your Dockerfile as shown in Scenario 1 is highly recommended. For local development, installing `pre-commit` on the host machine and letting it manage hooks against your local `.git` repository (Option A) is generally the most straightforward. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
