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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Mark,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If we have a mirror from Bazaar to CVS, we should be able to migrate to git and preserve history quite cleanly. I have used the cvs2git conversion successfully. It is non-destructive and should allow the procedure to be tested and verified prior to making the call to cut over. I am a big fan of git, and have a moderate amount of experience navigating its subtleties, so if you wish to contact me for assistance, don’t hesitate.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Randall<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> developers-owner@bugzilla.org [mailto:developers-owner@bugzilla.org] <b>On Behalf Of </b>Mark Côté<br><b>Sent:</b> October-21-13 12:20 PM<br><b>To:</b> developers@bugzilla.org<br><b>Subject:</b> Moving Bugzilla to git?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><pre>Hi all, I'm the manager of Mozilla's Bugzilla team. We've talked about<o:p></o:p></pre><pre>this idea before, but I thought I would flesh it out and ask for feedback.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>I think we should move the Bugzilla code off of the Bazaar system hosted<o:p></o:p></pre><pre>by Mozilla and onto git, and maybe even GitHub. There are a few reasons<o:p></o:p></pre><pre>for this:<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* git is pretty much the de facto standard for VCSs these days. This<o:p></o:p></pre><pre>means many people are familiar with it and like its flexibility (I<o:p></o:p></pre><pre>certainly do).<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* On the other side, Bazaar is almost dead. There are maybe 2-3 commits<o:p></o:p></pre><pre>to trunk every month.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* GitHub is extremely popular, and for good reason, since it's a very<o:p></o:p></pre><pre>powerful system. Exposure via GitHub could mean increased contributions<o:p></o:p></pre><pre>(whether we can keep up with them or not is, of course, another question. <o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* Mozilla would very much like to retire Tinderbox, since Bugzilla is<o:p></o:p></pre><pre>the only system still using it. Moving to GitHub means we could use<o:p></o:p></pre><pre>travis-ci, which is really nice (we use it for other projects on my team).<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>* Mozilla would also very much like to retire the Bazaar and CVS servers,<o:p></o:p></pre><pre>both of which are used solely by Bugzilla.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Doing a one-time migration is quite easy using fast-import/fast-export.<o:p></o:p></pre><pre>I've verified that it works, with one small error that should be simple<o:p></o:p></pre><pre>to fix (a single file not deleted in the git version).<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>However, even with some advance warning, I don't think we can convert<o:p></o:p></pre><pre>and then abandon Bazaar immediately due to Bugzilla's suggested upgrade<o:p></o:p></pre><pre>path, which is to install a package and then pull updates directly from<o:p></o:p></pre><pre>the Bazaar repository. If we had to do a security release, it doesn't<o:p></o:p></pre><pre>seem right to require users to switch VCSs to get that fix. That said, I<o:p></o:p></pre><pre>don't think we need to maintain Bazaar indefinitely, just for some grace<o:p></o:p></pre><pre>period. I suggest 9 months, which would put that sometime mid-2014. I<o:p></o:p></pre><pre>would, however, like to shut down CVS when we migrate to git,<o:p></o:p></pre><pre>so that we don't have to maintain three VCSs at the same time.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>I haven't found a suitable solution to automatically mirror changes from<o:p></o:p></pre><pre>git to Bazaar; there is one project[1] that at first glance appeared<o:p></o:p></pre><pre>suitable, but after running into problems, I had a discussion with the<o:p></o:p></pre><pre>package's author, who stated that there difficult bugs that would<o:p></o:p></pre><pre>prevent it from working the way we would need it to.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Luckily Bugzilla has already gone through this before, from CVS to<o:p></o:p></pre><pre>Bazaar, and we have a script[2] that steps through Bazaar commits and<o:p></o:p></pre><pre>applies them to a CVS repo. I've been modifying that script to do a<o:p></o:p></pre><pre>similar git-to-bzr translation, and I'm confident I can get it working.<o:p></o:p></pre><pre>The mirroring would be in a single direction, that is, from git to<o:p></o:p></pre><pre>Bazaar; after the migration, Bazaar would be read only to everyone<o:p></o:p></pre><pre>except the mirroring script.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>We would still need migration instructions, which I believe we can do<o:p></o:p></pre><pre>using the old cvs-to-bzr instructions[3] as a base.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>As for location of the repository, we could have Mozilla host the<o:p></o:p></pre><pre>official git repository and set up two-way mirroring to GitHub.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>How does this sound to everyone? Any strong objections? I and the rest<o:p></o:p></pre><pre>of the BMO team are willing to do most of the work.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Mark<o:p></o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>[1] <a href="https://launchpad.net/bzr-git">https://launchpad.net/bzr-git</a><o:p></o:p></pre><pre>[2] <a href="http://bzr.mozilla.org/bzr-plugins/bzr-to-cvs/view/head:/bzr-to-cvs.pl">http://bzr.mozilla.org/bzr-plugins/bzr-to-cvs/view/head:/bzr-to-cvs.pl</a><o:p></o:p></pre><pre>[3] <a href="https://wiki.mozilla.org/Bugzilla:Moving_From_CVS_To_Bazaar">https://wiki.mozilla.org/Bugzilla:Moving_From_CVS_To_Bazaar</a><o:p></o:p></pre><pre><o:p> </o:p></pre></div></div></body></html>