Git for Programmers

5 (3 reviews total)
By Jesse Liberty
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  1. Creating Your Repository

About this book

Git is the most popular version control system in the world. It allows developers to keep up with frequent code changes in a project, ensures there are no code conflicts between the developers, and reverts to an older version of code when required.

Git for Programmers comprehensively equips you with actionable insights on advanced Git concepts in an engaging and straightforward way. This book will help you gain expertise on Git with many practical use cases as you progress through the chapters.

The book begins with a quick history of Git and instructions on how to get it and install it, after which you’ll dive into the creation and cloning of your repository. As you progress through the book, you'll explore Git places, branching, and GUIs.

Once you understand the fundamentals, you’ll learn how to handle merge conflicts, rebase, amend, interactive rebase, and use the log. You’ll also explore important Git commands for managing your repository. Finally, the book concludes with coverage of bisect, blame, and several other problem handling techniques.

By the end of this book, you’ll be able to use Git with confidence; saving, sharing, and managing files as well as undoing mistakes and rewriting history.

Publication date:
June 2021
Publisher
Packt
Pages
264
ISBN
9781801075732

 

Introduction

In this chapter, we will cover the following topics:

  • A very brief history of version control and Git
  • Getting and setting up Visual Studio 2019, GitHub Desktop, and your terminal
  • Getting and installing Git
  • Configuring Git for Visual Studio, GitHub Desktop, and GitHub at the command line

Let's get started!

 

About this book

"Begin at the beginning," the King said gravely, "and go on till you come to the end, then stop." – Alice in Wonderland

In this book, we will cover Git from the very beginning all the way through to advanced topics. No experience with Git is expected. Though if you have been using Git, you'll probably want to skim the initial chapters. Git is arguably the most popular version control system in the world, but this raises the question: "What is version control?"

 

Version control

Before version control, I would code a bit and then when I became afraid of losing that code, I would make a backup of my directory. This is slow, inefficient, takes up a lot of disk space, and is very hard to share with others.

A Version Control System (VCS) does all this work for you (and more) and does so in a way that is fast, efficient, and takes up a minimum of disk space. One of the fastest and most efficient is Git, although there are others. This book will not spend a lot of time convincing you that Git is better than the others. First, the market has spoken, and Git prevails. Second, if you've purchased this book, you've already decided. And if you haven't already purchased this book, go do so. I'll wait here.

 

About the code examples

In order to demonstrate the use of Git, we need to have a small program that we can evolve. The code examples are given in C#, but they are so simple that you'll be able to follow them regardless of your experience with the language. For example, if you can figure out what this does, you're all set.

public class Program
{
    public void PrintHello()
    {
        Console.WriteLine("Hello World!");
    }
}

This code declares a class (don't worry about what that is) named Program. Inside that class is a method (function) called PrintHello that prints Hello World to the console (your screen).

This is about as complex as it gets, and I'll explain each code snippet as we go.

 

Just a brief history

In July of 2005, after just a few month's work, Linus Torvalds, the genius behind Linux, released Git to meet his own needs, the needs of the Linux community, and eventually, the rest of us. The goal of Git was to be fast and efficient. It succeeded.

While most VCSes at the time were centralized (all the files were kept on a big server), Git uses a distributed system, in which everyone has their own repository. Technically, no central server is required for Git, although if you are working in a team, a central place for sharing code is convenient. But the huge difference is that with Git, the vast majority of your interactions with the VCS are local – right there on your disk.

 

Tools for working with Git

There are a number of easily confused terms (such as Git versus GitHub) and there are many tools for working with Git – from the command line to Graphical User Interface (GUI) tools. This section will review some of these options.

GitHub, et al.

There are many services that allow you to create shared "repositories" (the location of all the versions of your program). The most famous and popular are GitHub and Microsoft's Azure, as well as BitBucket and GitLab. Azure is a very powerful system for DevOps, while GitHub is a very straightforward way to host your program. We'll be using GitHub in this book. (Recently, Microsoft acquired GitHub for $7.5 billion in stock – and made a huge commitment to GitHub, open source and, of course, to Git.)

Key point: Git is the system we're covering in this book. GitHub is a central repository system for sharing code (we'll make this more specific later in the...

 

Getting Git

The very first thing you need to do is to install Git on your computer. The official Git site states that "even if Git is already installed on your computer, it is probably a good idea to reinstall to update to the latest version."

Getting Git on Windows

There are also a few ways in which to install Git on Windows. I recommend using the official build. The most recent one is available from the Git website: https://git-scm.com/download/win.

Another way to get Git, and to kill two birds with one stone, is to download and install GitHub Desktop. The installer will also install a command-line version of Git. You can get it at https://desktop.github.com/:

Figure 1.6: Obtaining GitHub Desktop

This book will show its demonstrations on Windows 10, using Git version 2.30.0.windows.2, but the examples should work with just about any version of Git.

Getting Git on a Mac

There are several ways to install Git on a Mac. The easiest is probably...

 

Configuring Git – the command line

We'll look at configuring Git to personalize throughout this book, but for now, let's add your name and email address so that every entry into Git is stamped appropriately. Enter the command-line command:

git config --global --edit

This will bring up your editor. Find or create the [user] section and add the following:

[user]
name = Jesse Liberty
email = [email protected]

You will probably want to use your own name and email address.

There are other entries in the config file. Ignore them for now and save and close the file.

 

Configuring Git – Visual Studio

In Visual Studio for Windows, click on the Git menu and a dialog box will open. On the first tab, enter your username and email address:

Figure 1.8: Setting Git options in Visual Studio

 

Configuring Git – GitHub Desktop

To configure GitHub Desktop, you'll need an account on GitHub. We'll cover that in the next chapter. Once you do have an account, go to File | Options, select the Accounts tab, and then click on Sign in:

Figure 1.9: Setting up GitHub Desktop

 

Summary

In this chapter you saw an introduction to the book, listing what is in each chapter. You also saw a quick history of version control and of Git itself.

Next, we took a look at downloading the environments you'll need to follow along: Visual Studio 2019, GitHub Desktop, and PowerShell as your command line. All of these can be obtained for free.

Once the software was downloaded, we looked at how to set up Git, and how to set up the tools we'll be using.

About the Author

  • Jesse Liberty

    Jesse Liberty is a senior programmer specializing in Xamarin.Forms and related tools, including Git. He has been working with Git for fourteen years and is considered an expert by the developer community.

    Liberty hosts the popular, Yet Another Podcast and he is the author of more than a dozen best-selling programming books. and one not yet published novel. Liberty is a Microsoft MVP and has worked as a Program Manager for Microsoft, Distinguished Software Engineer at AT&T; Software Architect for PBS and Vice President of Information Technology at Citibank, and he was on the teaching staff at Brandeis University.

    Browse publications by this author

Latest Reviews

(3 reviews total)
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