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I'm using tortoise svn in Windows.
How can I branch in SVN and have it branch my svn:external folders as well?
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A trunk in SVN is main development area, where major development happens. A branch in SVN is sub development area where parallel development on different functionalities happens. After completion of a functionality, a branch is usually merged back into trunk.
Subversion Branching Strategies Subversion branches (SVN branches) allow your team to work on multiple versions of your code simultaneously. Developers can test out new features without impacting the rest of development with errors and bugs. SVN's “branch” directory runs parallel to the “trunk” directory.
What are externals definitions? Externals definitions map a local directory to the URL of a versioned resource. The svn:externals property can be set on any versioned directory and its value is a multi-line table of subdirectories and absolute repository URLs.
To create a branch or a tag in a Subversion repository, do the following: From the main menu, choose VCS | Subversion | Branch or Tag. Alternatively, select the source folder in the SVN Repositories tool window and choose the Branch or Tag command from the context menu.
You should use svn:externals as external references from different repositories. So svn:externals should refer to components, modules, 3rd party tools, etc.
You should not use svn:externals to emulate a "symbolic link"-behaviour by using externals to point into the same repository. You can solve such issues most of the time by modifying your build-structure, or use checkout-scripts and sparse checkout feature.
svn:externals have a lot of problems most of them are difficult to see, track and repair: see an example here
If you use externals to point to other repositories, you will most of the time do not have these problems.
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