[llvm-dev] RFC: Switching from Bugzilla to Github Issues [UPDATED]

James Y Knight via llvm-dev llvm-dev at lists.llvm.org
Mon Apr 20 16:08:39 PDT 2020

In a previous discussion, one other suggestion had been to migrate all the
bugzilla bugs to a separate initially-private "bug archive" repository in
github. This has a few benefits:
1. If the migration is messed up, the repo can be deleted, and the process
run again, until we get a result we like.
2. The numbering can be fully-controlled.
Once the bugs are migrated to *some* github repository, individual issues
can then be "moved" between repositories, and github will redirect from the
movefrom-repository's bug to the target repository's bug.

We could also just have llvm.org/PR### be the url only for legacy bugzilla
issue numbers -- and have it use a file listing the mappings of bugzilla id
-> github id to generate the redirects. (GCC just did this recently for svn
revision number redirections,

Then we could introduce a new naming scheme for github issue shortlinks.

On Mon, Apr 20, 2020 at 3:50 PM Richard Smith via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> On Mon, 20 Apr 2020 at 12:31, Tom Stellard via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>> Hi,
>> I wanted to continue discussing the plan to migrate from Bugzilla to
>> Github.
>> It was suggested that I start a new thread and give a summary of the
>> proposal
>> and what has changed since it was originally proposed in October.
>> == Here is the original proposal:
>> http://lists.llvm.org/pipermail/llvm-dev/2019-October/136162.html
>> == What has changed:
>> * You will be able to subscribe to notifications for a specific issue
>>   labels.  We have a proof of concept notification system using github
>> actions
>>   that will be used for this.
>> * Emails will be sent to llvm-bugs when issues are opened or closed.
>> * We have the initial list of labels:
>> https://github.com/llvm/llvm-project/labels
>> == Remaining issue:
>> * There is one remaining issue that I don't feel we have consensus on,
>> and that is what to do with bugs in the existing bugzilla.  Here are some
>> options
>> that we have discussed:
>> 1. Switch to GitHub issues for new bugs only.  Bugs filed in bugzilla
>> that are
>> still active will be updated there until they are closed.  This means
>> that over
>> time the number of active bugs in bugzilla will slowly decrease as bugs
>> are closed
>> out.  Then at some point in the future, all of the bugs from bugzilla
>> will be archived
>> into their own GitHub repository that is separate from the llvm-project
>> repo.
>> 2. Same as 1, but also create a migration script that would allow anyone
>> to
>> manually migrate an active bug from bugzilla to a GitHub issue in the
>> llvm-project
>> repo.  The intention with this script is that it would be used to migrate
>> high-traffic
>> or important bugs from bugzilla to GitHub to help increase the visibility
>> of the bug.
>> This would not be used for mass migration of all the bugs.
>> 3. Do a mass bug migration from bugzilla to GitHub and enable GitHub
>> issues at the same time.
>> Closed or inactive bugs would be archived into their own GitHub
>> repository, and active bugs
>> would be migrated to the llvm-project repo.
> Can we preserve the existing bug numbers if we migrate this way? There are
> lots of references to "PRxxxxx" in checked in LLVM artifacts and elsewhere
> in the world, as well as links to llvm.org/PRxxxxx, and if we can
> preserve all the issue numbers this would ease the transition pain
> substantially.
>> The key difference between proposal 1,2 and 3, is when bugs will be
>> archived from bugzilla
>> to GitHub.  Delaying the archiving of bugs (proposals 1 and 2) means that
>> we can migrate
>> to GitHub issues sooner (within 1-2 weeks), whereas trying to archive
>> bugs during the
>> transition (proposal 3) will delay the transition for a while (likely
>> several months)
>> while we evaluate the various solutions for moving bugs from bugzilla to
>> GitHub.
>> The original proposal was to do 1 or 2, however there were some concerns
>> raised on the list
>> that having 2 different places to search for bugs for some period of time
>> would
>> be very inconvenient.  So, I would like to restart this discussion and
>> hopefully we can
>> come to some kind of conclusion about the best way forward.
>> Thanks,
>> Tom
>> _______________________________________________
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>> llvm-dev at lists.llvm.org
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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