SVN 中的 -r 和 url@rev 有什么区别? [英] What's the difference between -r and url@rev in SVN?

问题描述

谁能解释一下下面两个SVN命令中-r REV和URL@REV语法的使用区别:

Can someone explain the difference between the use of the -r REV and URL@REV syntax in the following two SVN commands:

• svn co -r6002 https://svnserv2.acme.com/stx/project1/trunk/gui/Mammoth/WebContent/css

svn:无法在修订版 6002 中找到https://svnserv2.acme.com/stx/project1/trunk/gui/Mammoth/WebContent/css"的存储库位置

svn: Unable to find repository location for 'https ://svnserv2.acme.com/stx/project1/trunk/gui/Mammoth/WebContent/css' in revision 6002

svn co https://svnserv2.acme.com/stx/project1/trunk/gui/Mammoth/WebContent/css@6002

检出修订版 6002.

Checked out revision 6002.

因此，如果我使用 -r 签出一个 SVN 目录的版本，它会失败，但是如果我使用 url@REV 它可以工作 - 我会认为这两个是等价的，不幸的是 SVN 文档似乎没有解释差异.

So if I checkout a version of an SVN directory with -r it fails, but if I use url@REV it works - I would have thought the two were equivalent and unfortunately the SVN docs do not seem to explain the difference.

推荐答案

-r X 对 Subversion 说转到今天的 URL，告诉我你对修订版 X 的了解"(假设您尚未指定 @ 修订版)

-r X says to Subversion "go to the URL as it is today, and tell me what you know about revision X" (assuming you haven't specified an @ revision)

url@X 对 Subversion 说转到修订版 X 并找到此 URL"

url@X says to Subversion "go to revision X and find this URL"

@ 语法称为 挂钩修订.-r X 是操作修订版.

The @ syntax is called a Peg Revision. The -r X is the Operative Revision.

这是一个非常微妙的区别，但非常重要.当您使用 @X 时，您会经常使用 -r X.

It's a very subtle difference, but very important. You'll often use -r X when you're using @X.

因此，如果您在修订版 6003 中删除了 https://svnserv2.acme.com/stx/project1/trunk/gui/Mammoth/WebContent/css，它现在无法查看该 URLHEAD 是修订版 6004(或更高版本)，因为它不存在.

So if you deleted https://svnserv2.acme.com/stx/project1/trunk/gui/Mammoth/WebContent/css in revision 6003, it can't look at that URL now that HEAD is revision 6004 (or anything later) because it doesn't exist.

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