Open Source 101: A Deep Dive into Version Control with Git

Hey friend! If you‘re new to software development, wrapping your head around topics like open source, version control, and Git can feel like learning a foreign language. But I‘m here to be your guide and make these concepts click!

In this epic walkthrough, we‘ll explore:

What open source is all about, the values it represents, and why it matters
How version control systems like Git came to be so essential to modern coding
Step-by-step instructions for installing and configuring Git yourself
How developers leverage Git workflows to build amazing open source software
Tips for making your first open source contributions using professional Git practices

Let‘s get started! This is going to be fun 🙂

Open Source: Software Powered by Community

Open source software is software with source code that anyone can inspect, modify, and enhance. Projects embrace transparency and decentralization rather than hiding code away behind closed doors.

The concept dates back to the early days of computing in the 1950s/60s. But the modern open source movement really gained steam in the 1990s with the rise of Linux and other freely shared programs.

Some core open source values include:

Freedom – Users have complete control over the software and can customize it to their needs.
Transparency – The code is out in the open for anyone to audit, critique, or contribute to.
Collaboration – Projects welcome contributions from anyone in the world. Coding becomes a social activity.
Meritocracy – Ideas and contributions are judged on technical merit rather than who submitted them.
Community – Users become co-developers; there‘s a shared purpose and identity around projects.

Thousands of incredible open source projects exist today, including:

Operating systems like Linux, Android, and Chrome OS
Programming languages like Python, Perl, Ruby
Web servers like Apache (runs 37% of all web sites)
Databases like MySQL, MongoDB, Redis
Developer tools like Git, Node.js, WordPress
Cloud computing tools like Kubernetes, Docker, OpenStack

A 2016 survey by Black Duck estimates that open source now comprises 80% to 90% of all software code. It has become ubiquitous across tech.

What drives such massive growth? For many, open source is about freedom, transparency, and the mutual joy of creating something together. But there are also significant practical benefits:

Cost – Open source software is free to acquire and use. There are massive cost savings compared to proprietary code.
Security – With everything out in the open, the community can quickly find and patch bugs. Many eyes makes flaws shallow.
Quality – Open source projects often match or outpace proprietary counterparts in terms of features, stability, and performance.
Innovation – By bringing together diverse developers, open collaboration fuels cutting-edge advances.

Let‘s be clear – open source is about much more than just free software. It‘s about freedom, ethics, and building community. It‘s a development model that, when done right, produces higher quality software through global cooperation.

Version Control: Managing Code History

Alright, so open source code is shared freely…but how exactly do hundreds of developers collaborate on a single project together?

This is where version control systems like Git come into play!

Version control software allows developers to:

Track code changes over time for a project
Maintain read-only snapshots of the code (called "commits")
Collaborate with others without colliding code changes
Review project history to understand when/why things changed
Revert back to older versions if needed

For example, say I‘m working on a simple script with some other developers. I edit and save the file multiple times as I add new functionality:

Version 1: Initial script draft
Version 2: Added error handling
Version 3: Improved input validation
Version 4: Optimized performance

Rather than just saving over the same file again and again, version control lets me snapshot each state. If I realize I messed up in version 4, I can easily roll back changes to version 3.

Version control acts like an "undo" button for entire projects. It‘s an essential backbone that enables large-scale open source collaboration.

And version control systems have been around almost as long as software itself!

The original CVS (Concurrent Versions System) tool emerged in 1986.
Subversion (SVN) arrived in 2000 and rapidly displaced CVS as the dominant open source version control system.
But in 2005, along came Git…

Git Changes the Game

Created by Linus Torvalds to manage Linux kernel development, Git took version control to a whole new level.

Some key ways Git broke from past version control systems like CVS and SVN:

Distributed architecture – Each developer has the full codebase locally, enabling many decentralized workflows.
Cheap branching – It‘s incredibly fast and easy to spin up new branches to isolate changes.
Integrity – All changes are validated with a checksum, making corruption impossible.
Offline functionality – Entire commit history is on every developer‘s disk, enabling offline work.
Merge tracking – Git tracks merges to avoid repeating them, simplifying conflict resolution.

But beyond the technology, Git was groundbreaking because of its culture and ecosystem.

Unlike CVS and SVN, Git promotes distributed workflows that enable crazy new ways to collaborate at scale. Dozens of developers can work independently and merge changes together with relatively little friction.

This "pull request" model, where developers publish branches and review/merge code on centralized hubs like GitHub, has become a cornerstone of open source development.

And the vibrant ecosystem of cloud platforms like GitHub and GitLab, graphical clients like GitKraken, and Continuous Integration tools like Travis CI means Git fits right into modern development workflows.

Because Git is so fast, efficient, and scalable, it has become the standard version control system for virtually all open source and commercial development today. Over 90% of projects on GitHub use Git. And that brings us to…

Installing Git Locally

Alright, enough background and history. Let‘s actually get Git up and running locally so you can start using it!

The process looks slightly different across operating systems:

Installing Git on Linux

On Debian/Ubuntu systems, use the package manager:

sudo apt install git

For other distros, install tools like yum or compile the latest Git from source.

Installing Git on macOS

On macOS, use the Homebrew package manager:

brew install git

You can also download the official macOS Git installer from git-scm.com.

Installing Git on Windows

The official Git for Windows package gives you Git bundled with the Bash shell:

Git bash terminal on Windows

Run the exe installer and select "Git Bash Only" during setup to add it to your PATH.

Once installed, verify Git is available by typing git --version from your terminal.

Configuring Git

With Git installed, we need to configure some basic settings so it knows who you are:

git config --global user.name "Your Name"
git config --global user.email "[email protected]"

I also recommend setting your default text editor, such as:

git config --global core.editor vim

And to keep things simple, let‘s set the default branch name to main instead of master:

git config --global init.defaultBranch main

Okay, now Git is personalized – great start!

The last piece is to set up SSH keys…

Generating SSH Keys

SSH keys allow you to establish a secure connection between your local machine and GitHub for pushing or pulling code.

You can check for existing SSH keys first:

ls -al ~/.ssh

If you see a id_rsa.pub or id_ed25519.pub file, you‘re all set!

Otherwise, generate a new SSH key pair:

ssh-keygen -t ed25519 -C "[email protected]"

When prompted, hit enter to accept default file location. And optionally add a password.

Finally, copy the public SSH key:

cat ~/.ssh/id_ed25519.pub

And paste it on GitHub.com under SSH settings.

Now you can git push and git pull from GitHub repos over SSH!

Git Workflows for Open Source

Phew, I know that was a lot of installation and setup. But now Git is officially up and running locally and hooked up with GitHub.

So what can you actually do with this powerful tool?

Well, Git by itself just manages version control. But coupled with a hosting platform like GitHub, it enables awesome collaboration workflows like:

1. Fork & Pull

Fork a GitHub project to your own account
Clone it locally and make changes
Push changes to your fork
Open pull request to the original repo

This allows you to contribute to projects without direct write access. Changes are safely reviewed and merged by maintainers.

2. Shared Repository

Collaborators cloned from a shared central repo
Each develop independently on topic branches
Sync changes by pulling/pushing to the central repo
Pull requests used for review before merging

This "shared repo" model lets developers concurrently make isolated changes that can be merged back together.

3. GitFlow

Uses develop as main working branch
New features developed in feature/ branches
Changes merged to develop when ready
main branch stays stable for releases
hotfix/ branches for quick patches

GitFlow provides a robust branching model for managing larger projects.

There are endless ways to leverage Git‘s flexibility. Don‘t be afraid to innovate and find a workflow that suits your team!

Making Your First Open Source Contributions

As you can see, Git provides the foundation for developers to collaborate on open source software at scale. So I hope by now you‘re feeling eager to jump in and start contributing!

Here are my tips for making that first open source commit:

Find projects you actively use – Contribute to libraries and tools you already love! Familiarity makes getting started much easier.
Review open issues – Look for bugs or feature requests labeled as "good first issue" – these are ideal starting points.
Start small – Aim to keep your first PRs relatively minor, like fixing typos in documentation. Get familiar with the workflow.
Ask for feedback – Ping project maintainers kindly asking them to review your pull request. Most are very welcoming of new contributors!
Don‘t get discouraged – If your PR needs changes or isn‘t accepted, shake it off and try another project!
Soak up the culture – Beyond the code itself, absorb open source values like transparency and collaboration.

And most importantly, remember that open source is ultimately driven by passion. If you love software and enjoy tinkering/learning, you belong in this community!

Now go forth, share code freely, squash tricky bugs, and have fun changing the world through open source!

Warmly,

–Your New Coding Buddy