Difference between revisions of "Using Subversion"

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== Setting up Subversion for Developer Use ==
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The first thing you will want to do is setup the ssh access to svn.gna.org.  If you cannot type
 
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svn list svn+ssh://svn.gna.org/svn/gnustep/devmodules
 
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without having to type a password or in some way change the above command, you will need to visit the [[Svn SSH Setup]] page (this includes if you have to specify a different user).
 
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== Some background on repository layout ==
 
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To familiarize yourself with the layout, I would recommend looking at the [http://svn.gna.org/viewcvs/gnustep/ web-access to svn]
 
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for GNUstep.  You will notice that every project is in its own portion of the repository.  For example:
 
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/libs
 
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/libs/gui
 
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/libs/gui/trunk
 
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/libs/gui/branches
 
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/libs/gui/branches/dawn
 
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/libs/gui/branches/...
 
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/libs/gui/tags
 
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/libs/gui/tags/alex_last_semistable
 
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/libs/gui/tags/...
 
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This layout is very handy for having a per-project repository.  I can easily branch or tag just /libs/gui and it all stays in its own namespace.  However, what this DOES mean is that you cannot simply checkout /libs/gui or you will end up with several copies of the source.  To get around this, we are using a nifty feature of Subversion called externals.  Externals are metadata on a directory that basically tell the svn client to checkout some other url into a subdirectory when it is checked out.  So if I type:
 
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svn proplist -v svn+ssh://svn.gna.org/svn/gnustep/devmodules/core
 
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It will tell me that the svn:externals property contains:
 
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gui    svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk
 
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back    svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk
 
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base    svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk
 
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make    svn+ssh://svn.gna.org/svn/gnustep/tools/make/trunk
 
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So everytime I checkout /devmodules/core the svn client will automatically go to these URLs and check them out into subdirectories.  When I make changes in gui/ and commit them, it will really commit to /libs/gui/trunk.  For the most part if you checkout /devmodules, the externals have already been setup such that it will checkout something similar to checking out the whole repository before.
 
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== Tips, Tricks, and Resources ==
 
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* [http://svnbook.red-bean.com Version Control with Subversion]
 
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* [http://svnbook.red-bean.com/en/1.1/apa.html Appendix A: Subversion for CVS Users]
 
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* [http://gcc.gnu.org/wiki/SvnSetup GCC's SVN Setup page] (especially the ssh connection caching)
 
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* [[Subversion_Migration]] (notes on the initial migration)
 

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