SUBVERSION

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SUBVERSION

• The next generation of version control

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What is Subversion?

• Subversion is a newly designed open source
  version control system
• Subversion extends and enhances the methodology
  created by CVS
• Subversion is open source (free!)
• Subversion is available on nearly all platforms

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Why Subversion?

• Versioning of the whole repository, not
  individual files
• Support for both concurrent access and locking
• Support for attributes on all objects files,
  folders and revisions
• Optimized for distributed use

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Why Subversion, cont.?

• Updates are done in atomic transactions
• One version of the repository includes updates to
  multiple objects
• Operations like branching and tagging are
  extremely efficient

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What is the Version in Subversion?

• Revisions (version) contain a set of
  modifications to any number of files/folders.
• Users can see which files are modified in
  parallel
• Revision numbers are global for the repository.
  Each commit increases the version of the
  repository.

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Concurrent Work

• Subversion supports the two currently accepted
  models for dealing with concurrent development
• Concurrent edits
• Locking
• Both models can be used on the same repository at
  the same time

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Core Concepts

• Trunk
• Branches
• Merges
• Conflicts
• Tags

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Metadata and Objects

• Subversion (SVN) supports properties that can be
  associated with all objects (files, folders,
  revisions)
• Properties are name-value pairs
• Properties are revisioned as well (except
  properties of revisions)
• Uses of properties (notes, defect tracking,
  status of revision, etc)

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Accessing SVN

• HTTP/S by extending Apache
• Proprietary network protocol

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Subversion Clients

• TortoiseSVN integrated into Windows shell
• Subclipse integrated into Eclipse
• Standalone desktop client (Windows, Mac, Linux,
  Unix)
• Unix style command line

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Downsides to SVN

• Visual Studio 2003 Bug
• Visual Studio 2003 errors when operating on a web
  project using subversion
• Concurrent editing model may be frustrating for
  SourceSafe users

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Extensibility

• Subversion plays well with others
• Trac
• Wiki
• Issue tracker
• Can cross reference SVN items with Wiki and Issues

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More Information

• Subversion
• http//subversion.tigris.org
• TortoiseSVN
• http//tortoisesvn.tigris.org
• Trac
• http//www.edgewall.com/trac