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Re: Proposed Gerrit workflow (was: Re: Notes from Sharkfest '13)
From: Bálint Réczey <balint () balintreczey hu>
Date: Mon, 24 Jun 2013 13:38:00 +0100

Hi Michael,

2013/6/24 Michael Tuexen <Michael.Tuexen () lurchi franken de>:
On Jun 23, 2013, at 8:58 PM, Bálint Réczey <balint () balintreczey hu> wrote:

Hi,

2013/6/22 Marc Petit-Huguenin <marc () petit-huguenin org>:
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On 06/22/2013 09:43 AM, Bálint Réczey wrote:
Hi Marc,

2013/6/22 Marc Petit-Huguenin <marc () petit-huguenin org>:
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On 06/22/2013 03:47 AM, Bálint Réczey wrote:
Hi All,

2013/6/21 Marc Petit-Huguenin <marc () petit-huguenin org>:
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On 06/20/2013 04:52 PM, Guy Harris wrote:

On Jun 20, 2013, at 2:58 PM, Marc Petit-Huguenin
<marc () petit-huguenin org> wrote:

On 06/20/2013 02:17 PM, Gerald Combs wrote:

Advantates: - I'm not sure that an in-house equivalent (e.g.
Gerrit plus a private repository) would be better than what
Github offers.

Yes, Gerrit is better than github:

Presumably you mean "Gerrit plus a private repository is better
than github", as Gerrit, as far as I can tell, is just software
that works with a Git repository.

Yes, although managing repositories being what Gerrit do, Gerrit
without a least one repository would be a very boring application.
:-)

I have started describing a Gerrit based workflow which IMO would fit
to the project at http://wiki.wireshark.org/Development/Workflow .
Please check it and share your opinion.


"Code is building and tests are passing on all platforms. (Tests
automatically start when at least one Core Developer gives +1 or +2 to
prevent overloading or cracking the build servers.)"

Why do not build and test all patchsets submitted?  Is that a limitation
of the build servers?  Having Jenkins automatically verify your patchset
is IMO one of the nice feature of Gerrit, and it will lower the workload
of core devs if building and testing are done before they start looking
at the patchset.
Build can be triggered by patchset submissin, too, but it would require
more build server resources. Usually not the first version of the
changeset will be accepted especially from new contributors and this means
more builds.

My view is the opposite: New contributors patchsets will probably be rejected
anyway (does not build, does not pass test, etc...), so having the system
doing that lowers the burden on core developers, who they can focus on more
high level problems.

Note that Core Developers would not have to wait since they can give +1 for
their own changesets.

The other reason behind requiring a +1 from someone we trust is that
otherwise it would be easy to prepare a changeset which does unspeakable
things to the build servers which we don't want to happen. Without
requiring +1 we would have to prepare build systems to cope with malicious
commits.

That is a good point (basically because of the halting problem).  But builds
are done in isolation (i.e a git clone is done each time), so apart using too
much resources or never ending, there is no harm that can be done to the
infrastructure.  And there is a Jenkins plugin to abort a build if it is stuck.
I was concerned about using the buildbots for attacking other systems, too,
but all of those threats can be handled and we have time for setting
up build bots
properly.

I have updated the proposal to start tests for every change and allow
Code Devs to
bypass peer review.

Comments are still welcome. :-)
Dear all,

hmm. From a process point of view: How long do I need to wait until condition 2
is fulfilled. For me this looks like a race condition. If I get a 2+ before a 2-
it gets in, if it is the other way, it doesn't...
Devs coming late can discuss the change they don't agree with, like now. ;-)


Anyway... I'm not sure if this process really improves wireshark as a project.
It all depends on others willing to to do peer reviews. In an industrial environment,
you can force developers to do that. In an open source community, you can't.
I'm not saying, that the peer reviews won't be done, but I'm not sure if they will.
We already have code review in our process but it is performed in
bugzilla or on the
mailing lists. Gerrit will give a better interface for those.
We already checked interesting changes after commits, and Gerrit will
help that, too.

I've just checked LibreOffice's and Android's Gerrit installation and
they seem to
be making progress on reviews and
https://www.google.com/search?q=open+source+projects+per+review
also lists several articles about peer-reviews performed in Open Source projects
which make me think that we could do it, too.


The current process puts responsibility on the core developer who commits a
change. Personally, I don't think it is bad if this breaks the build on
some buildbot, I only this it is bad if the committer doesn't care. This
worked out pretty well in the past, I think. I only run the head version
of wireshark and can usually build it (thanks to the Mac OS X buildbots).
If a core developer didn't want to take responsibility for a patch, he
could contact others to get feedback on questions. This also worked in
the past since you contacted people who also are interested in the subject.
I'm generally satisfied with the quality of trunk and I'm proud to be
part of the project.
I also think if we could break trunk even less often, it would be even better
and Gerrit would help that and would also help discussing the patches.

The same responsibility applies for changes being compiled by the
buildbots. Each such change comes from a core developer. I'm hesitating
to allow an arbitrary patch to compile on the buildbots where we have
no one being responsible for it in any way. Some of the buildbots run
older software, some of them are not hardened in any way.
If all the buildbots are running a newly cloned VM and limits network usage
of the VM, I think we can be safe.


Does someone have experience with an open source project comparable to
Wireshark requesting peer review? Linux wants patches to be signed, but
they have maintainers, Mozilla/Firefox has payed developers...
https://www.google.com/search?q=open+source+projects+per+review lists a
few in addition to the two I listed in the proposal.


Don't get me wrong: I'm against introducing more procedural constraints,
if it helps wireshark as a project. I just think that the current situation
isn't too bad and I'm not sure how to make sure non-trivial peer reviews
get done...
I hope we could put together a pleasant wokflow which helps the project.
I think we see Git bringing in a lot of improvements but with Git can't come
without changing the workflow a bit. Simply because Git is way faster than
Subversion and it is too easy to push a lot of things to master accidentally.
There needs to be someone (Linux's model) or something (Gerrit) preventing
that.

I think the proposed workflow with Gerrit would fit the project's way of doing
development with minimal changes to the current workflow.

Cheers,
Balint
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