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slides/compsoc/2025-2025/intro_to_git.md
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---
title: "Intro to git"
sub_title: "Force push"
sub_title: "git push -f origin main"
author: "Prabuddha Hans"
date: "2025-09-22"
@ -10,348 +10,407 @@ theme:
# Git
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Git is tool that's used in the programming industry.
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Another name for Git is a Version Control System (VCS) tool.
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Specifically to track project work done, and the changes to files we've made.
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The more correct term is Source Control.
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It is NOT a programming language.
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Git is a tool made for (usually) us programmers to track the work we've done.
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Programmer socks (not) included.
![image:width:100%](intro_to_git/compsocks.png)
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Now we need to ask WHY.
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Why would we need a tool like this?
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Why not use Google Drive instead?
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I will find your IP address.
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In all honesty,
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It's to help keep track of who did what.
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And to work on unique features...
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without affecting the main area/branch of our work.
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When DO we use git?
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Because Git keeps track of the changes we've made to files,
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We can then use it to commit and stage these files,
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and push them to a place where we can store them.
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This place is called a Repository.
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Repositories are hosted on websites like GitLab, GitHub and Forgejo.
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But, an interesting feature of git, is that it allows you to time-travel.
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Meaning that if a project breaks, you can go back to before it broke.
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Now I hear you in the audience asking...
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Why not use SVN?
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The answer is simple.
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![image:width:100%](intro_to_git/NAH.jpg)
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An actual answer is that Git is Distributed, and SVN in centralized.
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Simply put, devs can store their changes locally on their machines,
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where on SVN they're stored on a central system.
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With a central system you NEED to be connected at all times to work on it.
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You can work locally on git without having to be connected,
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and then push once you're reconnected.
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Back to git.
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Let's start with the basics.
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# Live demonstration time
Please get your laptop out
Please get your laptops out
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How to download git & git LFS
How to download Git & Git LFS
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## Download
<<https://git-scm.com/downloads>>
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![image:width:100%](intro_to_git/git_download_button.png)
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![image:width:100%](intro_to_git/git_installer.png)
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![image:width:100%](intro_to_git/git_installer_notepad_as_default_editor.png)
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![image:width:100%](intro_to_git/git_installer_rename_master_to_main.png)
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![image:width:100%](intro_to_git/git_installer_checkout_unix.png)
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![image:width:100%](intro_to_git/git_installer_default_rebase_pull.png)
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<<https://forgejo.skynet.ie/Skynet/deploy_user>>
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Don't do this
![image:width:100%](intro_to_git/bad_message.png)
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![image:width:100%](intro_to_git/forgejo_template_button.png)
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![image:width:100%](intro_to_git/forgejo_template_repo_creation.png)
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![image:width:100%](intro_to_git/forgejo_repo_link.png)
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LFS Install
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````bash
git lfs install
````
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Setup SSH key (see Readme.md))
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![image:width:100%](intro_to_git/forgejo_repo_settings.png)
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![image:width:100%](intro_to_git/forgejo_secrets_location.png)
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![image:width:100%](intro_to_git/forgejo_add_secret.png)
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![image:width:100%](intro_to_git/forgejo_ssh_key_example.png)
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````bash
git init
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git push origin <branch_name>
````
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``https://<username>.users.skynet.ie/``
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TroubleShooting
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If you see this:
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> Credit: Geeks for Geeks
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Go here: https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent
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