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Migration from CVS to Subversion (SVN) at CERN: Benefits, Process, and Timeline

This document discusses the migration process from CVS to Subversion (SVN) at CERN, highlighting the advantages of SVN, which is a more powerful and flexible version control system. It outlines the similarities and differences between CVS and SVN, the necessary preparations for migration, and the current status of the project. A proposed timeline is provided, along with links to documentation and tools to facilitate the migration. This transition aims to enhance repository management and improve workflow for all users.

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Migration from CVS to Subversion (SVN) at CERN: Benefits, Process, and Timeline

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  1. Study forMigration from CVStoSubVersion (SVN) Gunter Folger CERN/PH/SFT

  2. Why to migrate • svn is more powerful • Usage largely similar to cvs • Except handling of cvs style tags • G4 cvs repository hosted by CERN/IT cvs/lcg service • Service provided by CERN/IT • CERN/IT runs two services, cvs/general and CVS/lcg • Strong push to migrate to SVN Gunter Folger - SVN

  3. Overview • What is SVN • What is needed before migration • Current status • Timeline for migration • Documentation links Gunter Folger - SVN

  4. What is Subversion (SVN) “Subversion • was designed to be a successor to CVS • its originators set out to win the hearts of CVS users in two ways • by creating an opensource system with a design (and “look and feel”) similar to CVS, • by attempting to avoid most of CVS's noticeable flaws. • Subversion is very powerful, very usable, and very flexible.” from Suvbersion book, Preface Gunter Folger - SVN

  5. SVN differs from CVS “Subversion tracks tree structures, not just file contents. It's one of the biggest reasons Subversion was written to replace CVS.” from SubVersion book, App. B Gunter Folger - SVN

  6. SVN features • SVN versions everything • Including directories • Allows to keep under ‘revision’ control the renaming, move, or deletion of files or directories • Revisions IDs are not per file, but on repository • Commits are transactions • No notion of cvs style Tag • Branch, which is a named copy, places Tag • Improved access to repository • Svn, also over ssh, • dav(http or https) • local Gunter Folger - SVN

  7. What is needed before migration Gunter Folger - SVN

  8. Prototype migration • Snapshot of cvs migrated in svn • https://svnweb.cern.ch/cern/wsvn/g4test/ • svn co svn+ssh://svn.cern.ch/reps/g4test/tags/geant4/_symbols/geant4-09-03-ref-07 • Directory structure ok, i.e. as wanted – can be changed • Set of tools developed to achieve this • Conversion needs about one working day • Emulation of sticky tag • Will be implemented via svn hook (still missing) • Performance is good • More technical details on migration in session 2-B, PrzemyslawPaprocki Gunter Folger - SVN

  9. Development tools (1) Bonsai • Tag collection • Ok, much simpler with svn • Web interface • Bonsai web interface needs re-write independent of svn! • Careful testing needed before switch to svn • replacement exists in alpha version • https://sftweb.cern.ch/geant4/geant4tags • Testing starting using tags from current db • New tags copied across • Needs testing, volunteers please contact me! Gunter Folger - SVN

  10. Development tools (2) • Adapt other procedures and scripts • system testing • release building • Currently moving tag • Prepare in branch, ‘tag’ final ? • Disclaimer, check for std::, ... • Adapt procedures to svn • Documentation • Work on documentation has started Gunter Folger - SVN

  11. Current status • Migration possible • Still work to be done, but no problems expected • G4Tags - Bonsai replacement • Alpha version ready • Should be fully ready and tested before actual migration • Do with tags from cvs • Switch before svn migration, if all goes well? • Need decision to go ahead with migration Gunter Folger - SVN

  12. Proposed schedule • Provide updated documentation by end 2010 • G4Tags tested by December 2010 • Migrate to svn early January 2011 • Decide upon migration – this workshop Gunter Folger - SVN

  13. svn References • SVN home page: • http://subversion.tigris.org/ • Ben Collins-Sussman, Brian W. Fitzpatrick, C. Michael Pilato“Version Control with Subversion”, • O’Reilly: http://www.oreilly.com/catalog/0596004486/ • Online version of book: http://svnbook.red-bean.com/ • SVN service at CERN: • http://cern.ch/svn • cvs2svn home page • http://cvs2svn.tigris.org/cvs2svn.html Gunter Folger - SVN

  14. Summary • Propose to migrate to svn • Lots of work for some • Some learning to do for all • Long term profit from modern repository • More in session 2-B today at 14:10 Gunter Folger - SVN

  15. Backup Gunter Folger - SVN

  16. Geant4:cvs use by developer • Developer checks out a reference tag • Updates files in partial directory tree to head, • Tags are not changed after creation • See differences to previous versions, log files,... Gunter Folger - SVN

  17. CVS use by testing or release manager • Checkout reference tag • Update list of dirs to more recent tag • Global to global-V09-02-02 • Particles to ... • ... • Frequent need to move tag prior to release • Release manager Gunter Folger - SVN

  18. Re-organizationClean-up? • Chance to re-organize repository • Several directories probably not in best place • But SVN supports fully support move, so can be done in transparent way later • Clean-up • No longer needed or (near-)duplicate directories • But do we want to break possibility to go back? Gunter Folger - SVN

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