GitLab & GitHub

In the previous chapter we covered local usage of Git. We learned how to keep our code versioned using it, how to go back in time, how to undo changes, how to keep separate branches of our code to work in more than one thing at a time, and how to move changes from one branch to another. That is a lot!

In this chapter we will continue doing more or less the same thing, but with a twist: how about having branches that don't live in your own computer?

If you worked in a project with someone else, you could each work in your own copy of the repo, and then sync changes with each other!

Or, if there was a company that provided the service, there could be a "central" copy of your repository, and you could both sync your codes with it, and then no matter how many people worked on the project, all of them could cooperate!

Good news! There are a number of companies that provide that service. For free! I am going to focus on Gitlab mostly because they provide not only a service to give you public repositories of your projects for free, but also private ones for things you don't want to share.

When I am giving specific instructions, I will give alternatives for gitlab and github. They are very, very similar.

Preparation

Create an account for yourself. Mine is ralsina so I will use that in the examples, feel free to use your own!

The details on how to setup the account I leave to you, they are no different to any other online service. Except for SSH keys.

All the communication between you and the site is private and encrypted. To do that, you need to give the site your "public key". This also allows the site to know you are who you say you are. You can sign your code using your keys.

So, if you have a ~/.ssh/id_rsa.pub file, good. If you don't you can create one with this command:

ssh-keygen -t rsa -C "your_email@example.com"

And then that will create the ~/.ssh/id_rsa.pub file. That file is your public key. There is also one without the .pub extension. That is your private key. NEVER SHARE THAT ONE WITH ANYONE. EVER EVER.

REALLY NEVER EVER SHARE THAT ONE.

Open that public file in a text editor and copy its contents.

In gitlab:
In the top-right menu ▶ Settings ▶ SSH keys ▶ Paste the public key.
In github:
In the top-right menu ▶ Settings ▶ SSH and GPG keys ▶ New SSH key ▶ Paste the public key.

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