Book Image

Git Essentials - Second Edition

By : Ferdinando Santacroce
Book Image

Git Essentials - Second Edition

By: Ferdinando Santacroce

Overview of this book

Since its inception, Git has attracted skilled developers due to its robust, powerful, and reliable features. Its incredibly fast branching ability transformed a piece of code from a niche tool for Linux Kernel developers into a mainstream distributed versioning system. Like most powerful tools, Git can be hard to approach since it has a lot of commands, subcommands, and options that easily confuse newcomers. The 2nd edition of this very successful book will help you overcome this fear and become adept in all the basic tasks in Git. Building upon the success of the first book, we start with a brief step-by-step installation guide; after this, you'll delve into the essentials of Git. For those of you who have bought the first edition, this time we go into internals in far greater depth, talking less about theory and using much more practical examples. The book serves as a primer for topics to follow, such as branching and merging, creating and managing a GitHub personal repository, and fork and pull requests. You’ll then learn the art of cherry-picking, taking only the commits you want, followed by Git blame. Finally, we'll see how to interoperate with a Subversion server, covering the concepts and commands needed to convert an SVN repository into a Git repository. To conclude, this is a collection of resources, links, and appendices to satisfy even the most curious.
Table of Contents (8 chapters)

Merging branches

Yes, I know, probably there's a thought on your mind since we start playing with branches: why he doesn't talk about merging?.

Now the moment has arrived.

In Git, merging two (or more!) branches is the act of making their personal history meet each other. When they meet, two things can happen:

  • Files in their tip commit are different, so some conflict will rise
  • Files do not conflict
  • Commits of the target branch are directly behind commits of the branch we are merging, so a fast-forward will happen

In the first two cases, Git will guide us assembling a new commit, a so-called merge commit; in the fast-forward case instead, no new commit is needed: Git will simply move the target branch label to the tip commit of the branch we are merging.

Let's give it a try.

We can try to merge the melons branch into the master one; to do so, you have to check...