1. Иш бошланиши
- 1.1 Талқинларни бошқариш ҳақида
- 1.2 Git нинг қисқача тарихи
- 1.3 Git асоси
- 1.4 Командалар сатри
- 1.5 Git ни ўрнатиш
- 1.6 Git да биринчи созлашлар
- 1.7 Қандай ёрдам олиш мумкин?
- 1.8 Хулосалар
2. Git асослари
3. Git да тармоқланиш
4. Git серверда
- 4.1 The Protocols
- 4.2 Getting Git on a Server
- 4.3 Sizning SSH ochiq (public) kalitingizni generatsiyalash
- 4.4 Setting Up the Server
- 4.5 Git Daemon
- 4.6 Smart HTTP
- 4.7 GitWeb
- 4.8 GitLab
- 4.9 Third Party Hosted Options
- 4.10 Хулосалар
5. Distributed Git
- 5.1 Distributed Workflows
- 5.2 Contributing to a Project
- 5.3 Maintaining a Project
- 5.4 Summary
7. Git Tools
- 7.1 Revision Selection
- 7.2 Interactive Staging
- 7.3 Stashing and Cleaning
- 7.4 Signing Your Work
- 7.5 Searching
- 7.6 Rewriting History
- 7.7 Reset Demystified
- 7.8 Advanced Merging
- 7.9 Rerere
- 7.10 Debugging with Git
- 7.11 Qism modullar (Submodule)
- 7.12 Bundling
- 7.13 Replace
- 7.14 Credential Storage
- 7.15 Summary
8. Customizing Git
- 8.1 Git Configuration
- 8.2 Git Attributes
- 8.3 Git Hooks
- 8.4 An Example Git-Enforced Policy
- 8.5 Summary
9. Git and Other Systems
- 9.1 Git as a Client
- 9.2 Migrating to Git
- 9.3 Summary
10. Git Internals
- 10.1 Plumbing and Porcelain
- 10.2 Git Objects
- 10.3 Git References
- 10.4 Packfiles
- 10.5 The Refspec
- 10.6 Transfer Protocols
- 10.7 Maintenance and Data Recovery
- 10.8 Environment Variables
- 10.9 Summary
A1. Appendix A: Git in Other Environments
- A1.1 Graphical Interfaces
- A1.2 Git in Visual Studio
- A1.3 Git in Eclipse
- A1.4 Git in Bash
- A1.5 Git in Zsh
- A1.6 Git in Powershell
- A1.7 Summary
A2. Appendix B: Embedding Git in your Applications
- A2.1 Command-line Git
- A2.2 Libgit2
- A2.3 JGit
A3. Appendix C: Git Commands
- A3.1 Setup and Config
- A3.2 Getting and Creating Projects
- A3.3 Basic Snapshotting
- A3.4 Branching and Merging
- A3.5 Sharing and Updating Projects
- A3.6 Inspection and Comparison
- A3.7 Debugging
- A3.8 Patching
- A3.9 Email
- A3.10 External Systems
- A3.11 Administration
- A3.12 Plumbing Commands
10.1 Git Internals - Plumbing and Porcelain
You may have skipped to this chapter from a previous chapter, or you may have gotten here after reading the rest of the book – in either case, this is where we’ll go over the inner workings and implementation of Git. We found that learning this information was fundamentally important to understanding how useful and powerful Git is, but others have argued to us that it can be confusing and unnecessarily complex for beginners. Thus, we’ve made this discussion the last chapter in the book so you could read it early or later in your learning process. We leave it up to you to decide.
Now that you’re here, let’s get started. First, if it isn’t yet clear, Git is fundamentally a content-addressable filesystem with a VCS user interface written on top of it. You’ll learn more about what this means in a bit.
In the early days of Git (mostly pre 1.5), the user interface was much more complex because it emphasized this filesystem rather than a polished VCS. In the last few years, the UI has been refined until it’s as clean and easy to use as any system out there; but often, the stereotype lingers about the early Git UI that was complex and difficult to learn.
The content-addressable filesystem layer is amazingly cool, so we’ll cover that first in this chapter; then, you’ll learn about the transport mechanisms and the repository maintenance tasks that you may eventually have to deal with.
Plumbing and Porcelain
This book covers how to use Git with 30 or so verbs such as
remote, and so on.
But because Git was initially a toolkit for a VCS rather than a full user-friendly VCS, it has a bunch of verbs that do low-level work and were designed to be chained together UNIX style or called from scripts.
These commands are generally referred to as “plumbing” commands, and the more user-friendly commands are called “porcelain” commands.
The book’s first nine chapters deal almost exclusively with porcelain commands. But in this chapter, you’ll be dealing mostly with the lower-level plumbing commands, because they give you access to the inner workings of Git, and help demonstrate how and why Git does what it does. Many of these commands aren’t meant to be used manually on the command line, but rather to be used as building blocks for new tools and custom scripts.
When you run
git init in a new or existing directory, Git creates the
.git directory, which is where almost everything that Git stores and manipulates is located.
If you want to back up or clone your repository, copying this single directory elsewhere gives you nearly everything you need.
This entire chapter basically deals with the stuff in this directory.
Here’s what it looks like:
$ ls -F1 HEAD config* description hooks/ info/ objects/ refs/
You may see some other files in there, but this is a fresh
git init repository – it’s what you see by default.
description file is only used by the GitWeb program, so don’t worry about it.
config file contains your project-specific configuration options, and the
info directory keeps a global exclude file for ignored patterns that you don’t want to track in a .gitignore file.
hooks directory contains your client- or server-side hook scripts, which are discussed in detail in Git Hooks.
This leaves four important entries: the
HEAD and (yet to be created)
index files, and the
These are the core parts of Git.
objects directory stores all the content for your database, the
refs directory stores pointers into commit objects in that data (branches), the
HEAD file points to the branch you currently have checked out, and the
index file is where Git stores your staging area information.
You’ll now look at each of these sections in detail to see how Git operates.