How does a Git repository works with a develop and master branch?

Question

I'm new to Git and this is really confusing. I wanted to start off developing a web application on Git and so far I've been dealing with troubles that have kept me behind.

I've read this blog post on a successful branching model for Git. I was really interested in setting up something similar to this.

It says that the repository has 2 main branches called master and develop. So I went ahead and created a repository. However, to my surprise, the repository itself was the default master branch. How was I supposed to create a develop branch? Do I create it in the parent of the master branch? That would mean that the develop branch is outside the repository.

Am I getting something totally wrong here? Do I just ignore the fact that I'm creating two branches inside the master branch?

Answer 1

A branch is not a directory. It is a commit label that moves along with commits, like tag is a commit label that stays with a particular commit. You will not have anything "inside" the master branch, rather master and develop will both initially label the same commit.

Create the develop branch like so:

git branch develop 

To clarify: let's say you have the initial commit A. It will be labeled as master branch.

git init  A [master] 

If you make a new commit B, the branch label will move:

git commit -a  A -> B [master] 

If you then branch into develop, the B will get the new label as well:

git branch develop  A -> B [master, develop] 

If you commit on the develop, it will move, but master won't:

git checkout develop git commit -a  A -> B [master] -> C [develop] 

If you now commit on the master, the tree will fork:

git checkout master git commit -a  A -> B -> C [develop]      +--> D [master] 

Meanwhile, you only have in your directory whatever the contents of your current commit is. Switch branches, and the directory contents change.