git - 什么是 git "Snapshot"？

Question

The official Git doc说:

$ git diff test

This will show you what is different between your current working directory and the snapshot on the 'test' branch

作为新手，这是非常令人困惑的。我从没听说过快照这个词。它们是指“test”分支的“HEAD”吗？

Answer 1

术语快照也用于 git 引用站点

它是“修订”的替代词。在其他版本控制系统中，对单个文件的更改被跟踪并称为修订，但使用 git 时，您跟踪的是整个工作区，因此他们使用术语快照来表示差异。

来自 http://gitref.org/index.html

Instead of writing a tool that versions each file individually, like Subversion, we would probably write one that makes it easier to store snapshots of our project without having to copy the whole directory each time.

This is essentially what Git is. You tell Git you want to save a snapshot of your project with the git commit command and it basically records a manifest of what all of the files in your project look like at that point. Then most of the commands work with those manifests to see how they differ or pull content out of them, etc.

If you think about Git as a tool for storing and comparing and merging snapshots of your project, it may be easier to understand what is going on and how to do things properly.