Git Lecture 1 – Introduction and Objects

This lecture introduces git and drills down into Git’s “objects”. Objects are central to the internal design of git. We will encounter three kinds of objects: blobs, trees, and commits and explore the relation between them. A good understanding of objects is the basis for a good understanding of everything built on top of them such as commits, branches, and more.

Lecture by: Jamie Julius

Recorded on: December 28, 2021

Videos in this series:
Git Lecture 1: https://youtu.be/G3b2qLhGhlA (this video)
Git Lecture 2: https://youtu.be/NbkL1yoZl5k
Git Lecture 3: https://youtu.be/eHypbybRHIU
Git Lecture 4: https://youtu.be/3AZBvjrAppQ
Git Lecture 5: https://youtu.be/awPLZPjf7pw

Answers to questions:
- Two objects with different keys will definitely have different content

- Files are stored in the repository as blob objects

- If a file is stored as an object and its content changes and is then stored again, it will be stored as a new object under a new key

- If my computer contains an object named 3fda113575a69335301cb7754e019eaef7838560 and your computer contains an object with the same name, then the contents can be assumed to be the same

- If two separate files in separate sub-directories of the same working directory have the same content, they will be stored as a single blob object

- If a single file changes in a directory and a snapshot is taken (add + commit), which objects will be created in the repository to reflect this? One blob, at least one tree (but maybe more if the file is in a sub directory), and one commit object

- What is the meaning of the name "git"? (hint: consult Wikipedia) All of the above