CI/CD Pipeline¶

What is CI/CD?¶

CI/CD stands for Continuous Integration and Continuous Deployment.

Continuous Integration (CI): This is the practice of automatically integrating code changes from multiple contributors into a single software project. The CI process is comprised of automatic tools that assert the new code's correctness before integration. A source code version control system, like Git, is often involved.
Continuous Deployment (CD): This is an automated process that takes validated features from CI and automatically deploys them into the production environment without manual intervention.

Why Use CI/CD?¶

Automated Testing: Every change is automatically tested. If a test fails, you'll know immediately.
Quick Deployment: Once the code is tested and built, it can be deployed automatically.
Quality Assurance: Ensures that all code is reviewed and tested, improving code quality.

Setting Up a Simple CI/CD Pipeline for Shell Scripting¶

For your homelab, a simple CI/CD pipeline could just be a script that runs ShellCheck on all your shell scripts whenever you make a change. Here's a basic guide to set this up:

Tools Needed¶

Git: To keep track of changes in your scripts.
ShellCheck: To perform static analysis on your shell scripts.
A Script to Tie It All Together: A simple shell script can serve as your CI/CD pipeline.

Steps¶

Install Git and ShellCheck

sudo apt update
sudo apt install git shellcheck

Initialize a Git repository Navigate to the directory where your shell scripts are stored and run:
```
git init
```

Create the CI/CD Script Create a new shell script, let's call it cicd_pipeline.sh:

#!/bin/bash

# Loop through every shell script in the directory
for script in *.sh; do
    # Run shellcheck on the script
    shellcheck "$script"

    # Check if shellcheck passed or failed
    if [[ $? -eq 0 ]]; then
        echo "$script passed."
    else
        echo "$script failed."
    fi
done