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From Brett Porter <br...@apache.org>
Subject Re: Full support for Git at Apache, a dangerously indigo plan.
Date Wed, 03 Nov 2010 21:51:13 GMT
Probably a trivial thing, but how important are aggregated statistical info about where individual
committers do their work, the "1,000,000 commits" type of tracking, svnsearch.org, etc. for
us or PR? Do we need to do the svn commit mirroring to keep that, or perhaps have something
else optionally available?

On 03/11/2010, at 10:08 AM, Paul Querna wrote:

> Please provide feedback and more tasks.  This is a brainstorm.  Please help out.
> If you want to help with a task, go do it.  The velocity of this
> project is entirely dependent on volunteers.
> Tomorrow I will take all the reasonable tasks we have, and put them
> each into a INFRA jira ticket.
> Stage -1: Please avoid bike sheds.
>  Goal: Indigo is my color today. <http://indigo.bikeshed.com/>  We
> will be providing full r/w git support for projects.  It isn't a
> trivial project, both for communities and for infrastructure.
>  Task: Recruit people to help with the following tasks.
> Stage 0: Basic development and design
>  Goal: Resolve any remaining questions about design and
> implementation of full Git support at Apache.
>  Task: Send this email. Status: Done!
>  Task: Evaluate Gitolite <https://github.com/sitaramc/gitolite>  We
> can definitely at least learn things from Gitolite even if we do not
> end up using the code.
>  Task: Decide on push transport.  Currently leaning towards offering
> only HTTPS based pushing, as then it is very easy to re-use our
> existing LDAP infrastructure.  We can do SSH based with a single git
> user + ssh public keys, but it is more work.
>  Task: Start putting tools, scripts and documentation in SVN.
> <https://svn.apache.org/repos/infra/infrastructure/trunk/projects/git/>
> Stage 1: Testing Repository
>  Goal: Build experience and document how the ASF is hosting
> repositories, and ensure correct permissions, hooks, backups,
> replication/mirror, etc are all working.
>  Task: Find server to do testing repository.  My preference is to use
> eris / harmonia as a pair in the long run, but for stage 1 we can just
> use a pair of small VMs.
>  Task: HTTPS Server setup.  Configure Apache + LDAP +
> git-http-backend
> <http://www.kernel.org/pub/software/scm/git/docs/git-http-backend.html>
>  Task: Figure out details of Git Slave.  Just like SVN, we will have
> git mirrored in both EU and US.  A push to the EU server should
> transparently push to the US server, and replicate back as needed.
>  Task: pre-receive hook: Authorization.  Based on groups in LDAP,
> restrict write access to members of the correct project. We will not
> have path based authorization under, only whole project.
>  Task: pre-receive hook: Repository temporarily disabled.  If
> /etc/nocommit is present, do not allow any commits.  This allows for
> server and repository maintenance.
>  Task: pre-receive hook: Do not allow history rewriting / git push --force.
>  Task: post-update hook: Logging of commit.  Log both the Apache
> committer, and the 'git' committer. Figure out how to make this
> information useful.
>  Task: post-receive hook: E-Mail notification.  We have a traditional
> dependence on 'good' commit emails.  We need a very good mailer, as
> SvnMailer handles many cases like large commits, weird charactersets,
> etc, that most git based mailers don't even approach.
>  Task: post-receive hook: CIA Notification.  <http://cia.vc/>
>  Task: post-receive hook: SvnPubSub Notification.  I think we should
> add support to SvnPubSub for git repositories. Maybe rename SvnPubSub
> -> VcPubSub too.
>  Task: post-receive hook: Slave Mirroring.  Every commit will be
> mirrored to a second ASF machine, just like we do with Subversion.
> This should just be a git push --mirror to a remote repository, but it
> needs testing.
>  Task: post-receive hook: Github mirroring.  After each push, every
> repository will be mirrored to github.
>  Task: Find web based view of Git repositories.  Gitweb or cgit or
> viewvc.  Evaluate and configure one of them.
>  Task: Determine policies for merge commits.  See what Postgres has
> done: <http://lwn.net/Articles/409635/>
>  Task: Document committer workflow.  Needs a /dev/ page describing
> all of the basic workflows that will be used by ASF committers.  This
> includes community expectations on how often to push, merge, and
> moving patches around.
>  Task: Document infrastructure workflows.  How to import a project
> from SVN.  How to import an external git repository. How to backup a
> repository. How to verify a repository.  How to setup a new TLP.
>  Task: Infrastructure Git run book.  Add run book for all services
> used in the git project.
> <https://svn.apache.org/repos/infra/infrastructure/trunk/docs/services/>
>  Task: Consider SVN-Mirroring of projects.  Once the primary VC is in
> Git, it is possible to provide a replicated copy in Subversion, so
> that existing users and build tools can continue using their checkouts
> over SVN.  We need to determine how feasible this is to actually
> implement.
> Stage 2: "beta" Testing by a project.
>  Goal: Test the new service on a volunteer project, ensuring both the
> technical and community issues are successfully addressed.
>  Task: Testing full history conversion.  We will be preserving 100%
> of the history of a project.
>  Task: Evaluate after a few months.  Whats working, whats not.
> Iterate on problems and documentation.
>  Task: Ensure widespread Infrastructure Team knowledge of git.  As
> the goal is to have Git be a core service, equivalent to Subversion,
> we must have multiple members of the team who are experienced with our
> setup and git in general. "Team" includes adding new root@ members, so
> step up :-)
> Stage 3: Wide availability
>  Goal: Projects can choose Subversion or Git as their primary Version
> Control, and conversion between each is done via standard INFRA
> tickets.

Brett Porter

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