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Update on Version Control Services at CERN

Update on Version Control Services at CERN. Giacomo Tenaglia , Hugo Jonatan Hugosson , Artur Wiecek , Alvaro Gonzalez Alvarez, Manuel Guijarro HEPiX Fall ’09 Meeting, LBNL. Agenda. Overview of VCS at CERN Subversion hosting VCS Roadmap Conclusions. VCS at CERN. CVS Started on 2000

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Update on Version Control Services at CERN

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  1. Update onVersion Control Servicesat CERN GiacomoTenaglia, Hugo JonatanHugosson, ArturWiecek, Alvaro Gonzalez Alvarez, Manuel Guijarro HEPiX Fall ’09 Meeting, LBNL

  2. Agenda • Overview of VCS at CERN • Subversion hosting • VCS Roadmap • Conclusions Update on VCS at CERN - 2

  3. VCS at CERN • CVS • Started on 2000 • >60 Active Projects, >23K commits/month • AFS-centric • LCGCVS • Started on 2002 • ~20 Active Projects, >22K commits/month • FS-based (faster access) • Subversion • Pilot: June 2008, Production: January 2009 • >110 Active Projects, >33K commits/month Update on VCS at CERN - 3

  4. VCS at CERN (2) • CVS to Subversion Migration • Campaign started on January 2009 • 34 CVS projects have migrated(*) so far, including: • ATLAS (Offline, Groups and Documents) • CMS Online and DAQ • CASTOR • 0 LCGCVS projects have migrated(*) so far • Tentative CVS shutdown (write access): • End 2009 • End 2010 • Beginning 2011 (*) based on spontaneous declarations by librarians Update on VCS at CERN - 4

  5. Usage Statistics Update on VCS at CERN - 5

  6. Support Requests Update on VCS at CERN - 6

  7. Subversion Hosting Golden Rule: “Thou Shalt Not Provide Personalizations” Update on VCS at CERN - 7

  8. SVN Service Design Update on VCS at CERN - 8

  9. SVN Service Design (2) • Repository access • “Core business” • Restricted shell (SVN+SSH) • Minimal Webserverconfig (HTTPS) • Hooks chrooted • Web interface(s) • WebSVN • Trac (yes, it’s also a ticketing system) • Standard CERN SSO authenticated access Update on VCS at CERN - 9

  10. SVN Service Design (3) • Administration delegated to librarians: • AuthZ management • Versioning of config files • Hooks personalization • Trac administrator privileges • Usage statistics • Personal repositories • Lifetime = account lifetime • Limited quota Update on VCS at CERN - 10

  11. SVN Service Design (4) • Librarians and Users have influence on: • Architecture and Standards (eg: NFS for Trac) • Functional Requirements (eg: HTTPS Access) • Usability Requirements (eg: Migration Recipes) • KPI (eg: Single repository availability) • SVN Forum twice a year: • Meet users in non-stressful situations • Review of major changes and incidents • Presentation of current development efforts • Proposals for future changes and discussion Update on VCS at CERN - 11

  12. SVN Service Operation • Built on top of standard CERN IT tools: • HelpDesk • Change Management (TBD) • Incident Management (Remedy) • Access Management (E-Groups, CERN SSO) • Monitoring and Control (LEMON, SLS) • IT Operations (SLC, Quattor, TSM, AFS) • Complemented by standard DES tools: • Functional Monitoring (Oracle EM) • Extended IT Operations (OffSite Backup) • NAS-based storage (NFS) Update on VCS at CERN - 12

  13. SVN: Open Issues • CVS Migration • “Tags Blues” • Big success stories help.. sometimes • 100% User-driven • Not your “standard” FLOSS-based service • AFS limitation on max files per dir: upgrade to SVN 1.5 Server-side • “Endless checkout” problem for statistics generation: change tool Update on VCS at CERN - 13

  14. SVN: More Open Issues • Clients madness • “1.5 is strongly recommended for branching/merging” (SVN Book) • SL5 has only 1.4 • Server is 1.5 (“version envy”) • Security is a trade-off • Less flexibility • Slower request fulfillment • Full-blown test environment/sandbox • Lack of it Update on VCS at CERN - 14

  15. VCS Roadmap • LCGCVS: Migration to “standard” CVS • Measure performance • CVS: Guess what ? • We rely on librarians will.. • SVN: Usability and Maintainability • User-centricness (docs, “My projects” page) • Fully move to NFS Storage Update on VCS at CERN - 15

  16. Conclusions • VCS hosting is not trivial: • Users know clearly what they want (eg: Trac popularity) • Being up to date is essential • Communication with Users is useful: • Are we correctly measuring our Service ? • Are we implementing the right standards ? • Which percentage of the functionalities are actually used ? • ITIL (in our case) works! Update on VCS at CERN - 16

  17. Questions(maybe also Answers) ? Thanks for listening! http://cern.ch/((lcg)?cvs|svn) Update on VCS at CERN - 17

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