Abstract
Due to user demand and to support new development workflows based on code review and multiple development streams, LHCb decided to port the source code management from Subversion to Git, using the CERN GitLab hosting service. Although tools exist for this kind of migration, LHCb specificities and development models required careful planning of the migration, development of migration tools, changes to the development model, and redefinition of the release procedures. Moreover we had to support a hybrid situation with some software projects hosted in Git and others still in Subversion, or even branches of one projects hosted in different systems.We present the way we addressed the special LHCb requirements, the technical details of migrating large non standard Subversion repositories, and how we managed to smoothly migrate the software projects following the schedule of each project manager.
Highlights
With Git[1] gaining more and more popularity among High Energy Physics developers, and given requests for Git support in the LHCb development workflow, the LHCb Core Software Group decided to migrate our source code repositories from the existing CERN Subversion[2] hosting service to the new CERN Git hosting service based on GitLab[3].The layout of the LHCb Subversion repository[4] required a special migration strategy, and the development tools and workflow required adaptation.2
We present the way we addressed the special LHCb requirements, the technical details of migrating large non standard Subversion repositories, and how we managed to smoothly migrate the software projects following the schedule of each project manager
Requirements The main requirements for migration of the code were formalized by the LHCb Core Software Group in the following list:
Summary
- The LHCb Turbo Stream Sean Benson, Vladimir Gligorov, Mika Anton Vesterinen et al. - Software Development Infrastructure for the FAIR Experiments F Uhlig, M Al-Turany, D Bertini et al. - The LHCb Turbo Stream Sean Benson, Vladimir Gligorov, Mika Anton Vesterinen et al. - Software Development Infrastructure for the FAIR Experiments F Uhlig, M Al-Turany, D Bertini et al. - Migration of the Gaudi and LHCb software repositories from CVS to Subversion M Clemencic, H Degaudenzi and the LHCb Collaboration.
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