Wego Docker Image

This project builds a Docker image for Wego, a CLI weather application. The image is built in a multi-stage Dockerfile that compiles the Go binary statically (with CGO disabled) for compatibility with a minimal Alpine Linux image.

Features

• Runtime Configuration: Uses environment variables (OWM_API_KEY and LOCATION) to dynamically update the generated Wego configuration file (~/.wegorc) at container startup.
• Wrapper Script: A shell script (runWego.sh) ensures configuration values are updated before starting the application.

Prerequisites

• Docker installed on your system.
• A valid OpenWeatherMap API key.

Build the Image

Run the following command in the project directory:

docker build -t wego .

Running the Image

You can supply the following environment variables at runtime:

• OWM_API_KEY: Your OpenWeatherMap API key.
• LOCATION: The desired location for weather forecasting.

For example:

docker run -e OWM_API_KEY=YOUR_KEY -e LOCATION=YOUR_LOCATION wego

To get the status of your weather after configurations have been made:

docker start -ai wego

Files

• Dockerfile: Multi-stage build file.
• runWego.sh: Startup script that updates the configuration file (~/.wegorc) from environment variables and executes Wego.
• .wegorc: The configuration file generated by Wego – updated during image build and runtime.

Troubleshooting

• Static Linking: If you encounter issues with the binary not executing on Alpine, ensure that CGO_ENABLED=0 is set during the build.
• Configuration Issues: The script checks ~/.wegorc for existing default values and updates them with provided environment variables. You can override these by passing variables at runtime.