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I know how to use tags in subversion. I create a tag every time I get to a release milestone.
What I don't quite understand is how they work.
Is a tag just a copy, made from what ever revision I specify? Or is a tag more like a reference, where internally subversion just says GO TO /trunk/project/ Revision 5 or whatever.
The command to create a tag (svn copy) seems to imply that it's a copy, but I've seen other people write that subversion doesn't really copy anything.
Say I dump just the HEAD revision of a repository. I don't care about any history except the tags. Are those tags dumped along with the rest of the Head revision?
Finally, is all this just programming magic that I don't really want to know.
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Version Control System supports the tag operation by using that concept that one can give meaningful name to a specific version of the code. Tag allows to give descriptive and memorable names to specific version of code. For example BASIC_ARRAY_OPERATIONS is more memorable than revision 4.
Select the folder in your working copy which you want to copy to a branch or tag, then select the command TortoiseSVN → Branch/Tag.... If you can't remember the naming convention you used last time, click the button on the right to open the repository browser so you can view the existing repository structure.
Creating a branch is simple. All you need to do is make a copy of your project using "svn copy". This command will require the URL of your project's /trunk directory as well as the URL of the directory where you want to create your branch. This location will virtually always be inside of your /branches directory.
Yes, a svn copy (whether you are thinking of it as a tag, a branch, or copying a file in trunk) is all the same. SVN will internally create a pointer to the source location at that revision. If you then make changes to the copy (which you are likely to do if it is a branch or a copied file in trunk, but shouldn't do for tags), SVN will only store what was changed, rather than creating a whole new copy.
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