Git at CASD

Datascience team

Goals

  • What is git?
  • How does git work?
  • What is GitHub/Gitlab?
  • Git at CASD

What is git?

Git is a distributed version control system (VCS) created by Linus Torvalds in 2005 to manage the Linux kernel. The main objective of git is:

  • Version control: Every change is recorded with author, date, and message.
  • Backtracking: Recover any version of any file at any time.
  • Collaboration: Creating a "parallel universe" for your code to make changes safely

Key concepts in git (1)

  • Git Repository(repo): is the project folder where Git tracks all versions of your files
  • Working Directory: The files and folders you're actively editing.
  • Staging Area (Index): A temporary area to preview and prepare changes before committing.
  • Snapshot: A snapshot records all your files at a given point of time.
  • Commit: The act of taking a snapshot with date, author, and message.

Key concepts in git (2)

  • Branch: A branch is a collection of linked commits. Each repo must have at least one branch. The main branch is called master branch by default
  • Master Branch: is the production-ready code version of your project
  • HEAD: A pointer to your current branch. It represents where you are in the Git history, and where the next commit will be written
  • Merging Branch: A temporary area to preview and prepare changes before committing.

Git workflow

git-workflow

Git merge branch

git-branch

TP1

git-workflow-tp1

What is github?

github.com is the most popular web-based git repository hosting service. It adds extra functinality on top of git (e.g. UI, pull requests, project management, etc.). There are other similar git hosting services:

Self-hosted web-based git repository

There are many self-hosted web-based git repository solutions:

  • GitLab Community Edition (CE): Full-featured web-based git repository and open source
  • Gitea: Lightweight, open source, easy to install
  • SourceHut: Modular, minimalist, fast
  • Gitprep: It is Github clone

Git at casd

CASD proposes two types of remote git repository: git-bare and self-hosted gitlab-ce server

  • Git Bare Repository: provided by default for all CASD projects
    •
  • Gitlab-ce server: need to ask PMS for a cost estimation based on the server config
    •

What is a Git Bare Repository?

A bare repository is a Git repository that does not have a working directory. It only contains the .git directory (i.e., the version control data), and it's typically used:

  • As a central repository for collaboration (lightweight version of GitHub).
  • As a continuous deployment target.

TP2

git-workflow-tp2