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Git, Docker & Modern DevOps Engineering Masterclass/Beginner/Git Architecture: Working Directory, Staging & Commits

Git Architecture: Working Directory, Staging & Commits

Key Takeaway:Git tracks project snapshots across three areas: Working Directory, Staging Area (Index), and Commit History.

What Is It & Why Use It?

Unlike simple file backups, Git is a distributed version control system. When you edit code, changes exist in your Working Directory. Using 'git add' stages changes into the Index. Running 'git commit' captures a permanent cryptographic snapshot (SHA-1/SHA-256 hash) into the repository database.

Git Three-Stage Architecture Pipeline

Interactive Diagram

Visual Architecture & Runtime Schematic

Git Three-Stage Architecture Pipeline

Node 01

Working Directory (Unstaged files)

Entity state & role in architecture: Working Directory (Unstaged files)

Example Code

# 1. Initialize a brand-new Git repository
$ git init my-awesome-app
$ cd my-awesome-app

# 2. Check current status
$ git status
# On branch main: No commits yet

# 3. Stage changes and commit snapshot
$ echo "console.log('Hello World');" > index.js
$ git add index.js
$ git commit -m "feat: initialize project entry point"

# 4. View concise commit history log
$ git log --oneline
# 7f3a9b1 feat: initialize project entry point

Language: bash

Code Line-by-Line Breakdown

git init

Creates a hidden .git metadata folder containing object storage.

git add index.js

Moves modified file into the staging area preparing for snapshot.

git commit -m "..."

Records snapshot permanently with an explanatory commit message.

Remember These Rules

Git stores snapshots of content, not incremental line diffs.

Use a .gitignore file to prevent node_modules, .env secrets, and build outputs from polluting history.

Commit messages should follow conventional commits (feat:, fix:, docs:, chore:).

Quick Test

Which command moves modified files from the Working Directory into the Staging Area?

# 1. Initialize a brand-new Git repository $ git init my-awesome-app $ cd my-awesome-app # 2. Check current status $ git status # On branch main: No commits yet # 3. Stage changes and commit snapshot $ echo "console.log('Hello World');" > index.js $ git add index.js $ git commit -m "feat: initialize project entry point" # 4. View concise commit history log $ git log --oneline # 7f3a9b1 feat: initialize project entry point