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20-CMS - Change Version Management A look at CVS Subversion...

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Change / Version  Management A look at: CVS, Subversion and cfengine
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What is Version Management? Management of multiple revisions of the same unit of information Application Source Code, Art Resources such as blueprints or electronic models SCM (Software Configuration Management) - Revision control for software projects
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Why is it important? Teamwork Allows for information to be worked on by a team of people concurrently “copy-modify-merge” model Prevent overwriting of someone else’s change Development Develop two versions of the software concurrently Fix minor bugs in a stable version while adding bleeding edge features to another Debugging Retrieve and run different versions of the software to determine in which version(s) the problem occurs Provides accountability, who made what change when
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SCM Packages Server Based CVS Subversion Rational Clear Case (proprietary) Distributed GNU Arch Git – Used for Linux kernel development BitKeeper (proprietary) Many Others
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CVS Concurrent Versions System CVS developed from an earlier versioning system called Revision Control System (RCS) The code that eventually evolved into the current version of CVS started in April 1989 CVS is extremely popular, and it does the job.
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CVS Terminology Module A single project managed by CVS Repository Where a CVS server stores the modules it manages Checking out Acquiring a copy of a module Working copy The checked out files Committing Updating the repository with the changes you made on your working copy Update Acquire the latest changes from the repository in the working copy
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CVS Problems Number of awkward limitations Changes are tracked per-file instead of per- change Commits aren't atomic Renaming files and directories is awkward Must be deleted and re-added Branching limitations Some of the maintainers of the original CVS have declared that the CVS code has become too crusty to effectively maintain.
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Subversion Background Designed specifically to be a modern replacement for CVS Don’t need to break new ground in version control methodology
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  • Spring '08
  • DAVISON
  • Revision control, Comparison of revision control software, Concurrent Versions System, cfengine, svn svn svn

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