git

How GIT works under the HOOD?

git objects

3 basic objects in git:

• commit
• tree
• blob (branch 都不是 object, branch 只是个指向于某个 commit 的 pointer)

一个 commit 的 data structure:

• commit = tree + metadata
• 

tree:

• a tree is some blobs and trees
• basically like a dir, there could be just files or files and dirs inside
• blob:
• a blob is a file
• basically like a file
• the whole file that changed between this commit and parent commit (not just the diff)
• files that didn’t change will NOT be in the blob
• 

tags:

• 实际上可以理解为一个指向某个特定 commit 的 pointer; 像是个 branch, but never moves
• gives a friendlier name than a commit
•