GSoC 2019 [Buildbot ideas]

[Mojca Miklavec]

Dear Rajdeep,

It's not just a question of how to fetch a PR. That shouldn't be too
difficult, I hope (and probably the link you provided works as intended).

The tricky question is how to prevent malicious PRs from doing damage on
the builders. I assume that a proper solution would require starting a
fresh VM for each build. There is some support in the buildbot already:
    http://docs.buildbot.net/2.1.0/manual/configuration/workers-libvirt.html
    https://github.com/kholia/OSX-KVM
but we would need to find a way to create VMs with macOS, so it might not
be trivial to do it. On top of that what we would really need the PRs for
are the old machines (say, 10.6, or even 10.4 if we would want to go to
extremes) where it might be even less trivial to automate this in a nice
way.

(A compromise solution would be to only allow trusted developers to test
pull requests on devoted builders, where we would also need to make sure to
uninstall the software after the PR is done building.)

While implementing this remains almost the number one requested thing when
people contribute to packages, I'm not sure how much time doing this would
take. It could be that this could be done in a day or a few days, but it's
also possible that there would be some stumbling block that would require
more hacking skills and would prevent us from proceeding, and not even two
months would suffice. In one way, I wouldn't mind if a student would work
on this for the full summer to get this working; on the other hand, if
there's a block and none of us is skilled enough to overcome it, it makes
more sense to proceed with other stuff that can certainly be done.

Mojca


On Wed, 27 Mar 2019 at 16:05, Rajdeep Bharati <rajdeepbharati13 at gmail.com>
wrote:

> I could use the GitHubPullrequestPoller
> <http://docs.buildbot.net/current/manual/configuration/changesources.html#chsrc-GitHubPullrequestPoller> which
> periodically polls the Github API for new/updated PRs.
>
> Here is an example:
> https://github.com/halide/build_bot/blob/master/master/master.cfg
>
> c['change_source'].append(GitHubPullrequestPoller(
> owner = 'halide',
> repo = 'Halide',
> token = token,
> pullrequest_filter = pr_filter,
> pollInterval = 60*5, # Check Halide PRs every five minutes
> pollAtLaunch = True))
> Rajdeep
>
> On Wed, Mar 27, 2019 at 3:59 AM Mojca Miklavec <mojca at macports.org> wrote:
>
>> Dear Rajdeep,
>>
>> On Tue, 26 Mar 2019 at 19:51, Rajdeep Bharati wrote:
>> >
>> > I have submitted a draft proposal:
>> https://docs.google.com/document/d/12wRjA8sOWNOuApHZ_fm0n1aIPLVPt9Xm2yGiMwiK3AI/edit.
>> Could you please provide some feedback?
>>
>> Cool, thank you very much, it looks nice, please give us a bit of time.
>>
>> One question: what precisely is your plan for setting up disposable
>> builds for PRs?
>>
>> Mojca
>>
>
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