svn - [SVN] : The concept of branch

Question

我想知道在创建分支时，SVN只是从主干上复制一个完整的副本还是利用某种机制来实现？

谢谢。

Answer 1

AFAIK，它所做的是对您要从中分支的修订版本的引用，然后记录您 checkin 的任何内容的增量。

引用SVN书:

Subversion's repository has a special design. When you copy a directory, you don't need to worry about the repository growing huge—Subversion doesn't actually duplicate any data. Instead, it creates a new directory entry that points to an existing tree. If you're a Unix user, this is the same concept as a hard-link. From there, the copy is said to be “lazy”. That is, if you commit a change to one file within the copied directory, then only that file changes—the rest of the files continue to exist as links to the original files in the original directory.