Re: [chromium-dev] PSA: sub-tree mirrors of chromium/src.git will be lagged for ~2 hours

[Ryan Sleevi]

These were mirrored for ChromeOS, in particular, the deprecated 'platform' work (it has been replaced by 'platform2', which uses GYP and is much more hermetic)

If anything breaks, it should hopefully be constrained only to certain deprecated CrOS workflows.

On Aug 21, 2014 9:57 PM, "Robert Iannucci" <iann...@chromium.org> wrote:

Yes, they're all just directories in the chromium tree, but they're currently mirrored independently on chromium.googlesource.com. This is done today with git-svn, by having it mirror those subdirectories from svn to git. After chromium/src.git is a real git-repo, that will no longer be an option. What I'm doing is setting up a daemon which will mirror from the full src.git repo to these subtree mirrors.

For example, here's the repo mirror of the src/net subdirectory: https://chromium.googlesource.com/chromium/src/net.git

After this change is done, instead of being updated from src.chromium.org/viewvc/chrome/trunk/src/net via git-svn, it will be updated (same content) from src.git via an efficient daemon.

This was done in lieu of hunting down all the consumers of the existing sub-repo mirrors and getting them to change. This way we can transparently continue to provide these subtree mirrors.

Rob

On Thu, Aug 21, 2014 at 9:52 PM, James Robinson <jam...@chromium.org> wrote:

On Thu, Aug 21, 2014 at 7:39 PM, Robert Iannucci <iann...@chromium.org> wrote:

TL;DR: The following git repos will have about 2 hours of lag (on chromium.googlesource.com):

• chromium/src/base
• chromium/src/build
chromium/src/crypto
chromium/src/dbus
chromium/src/gpu
chromium/src/media
chromium/src/mojo
chromium/src/net

These (and several few others) are just directories in the chromium tree, not standalone projects.  What do you mean by the git repo?  Are projects pulling these independently?

- James

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[Robert Iannucci]

Hopefully :). I didn't want to spend a lot of time hunting for downstream dependencies on these repos, which is usually a endless endeavor. The subtree daemon is only going to push fast-forwards on these repos though, so I'm pretty hopeful that no one will really even notice that it's different.

[Robert Iannucci]

On Thu, Aug 21, 2014 at 10:11 PM, James Robinson <jam...@chromium.org> wrote:

OK, so this won't impact most chromium developers who are just using src.git.  Thanks for the clarification.

Correct

[Robert Iannucci]

Forgot to hit send, but this is completed, and you can see a live mirrored commit here: https://chromium.googlesource.com/chromium/src/media/+/58bb04040d462aaa868135abfd4e20b6e9dfec8c

[Robert Iannucci]

Yep, I completely agree, I just wanted to decouple that from the migration. FWIW, the new daemon is substantially less complex than the previous one.

In general, I'm in strong favor of removing code and disabling redundant systems :)

On Fri, Aug 22, 2014 at 8:38 AM, Viet-Trung Luu <viettr...@chromium.org> wrote:

Gah, from the right email address this time.

On Fri, Aug 22, 2014 at 8:37 AM, Viet-Trung Luu <v...@google.com> wrote:

On Thu, Aug 21, 2014 at 10:10 PM, Robert Iannucci <iann...@chromium.org> wrote:

Hopefully :). I didn't want to spend a lot of time hunting for downstream dependencies on these repos, which is usually a endless endeavor. The subtree daemon is only going to push fast-forwards on these repos though, so I'm pretty hopeful that no one will really even notice that it's different.

This seems like a reasonable solution at this moment, but we should try to turn down as many of those mirrors at some point, rather than eternally accumulating maintenance burden.

We should also track down all dependencies, and find a way of tracking new dependencies. (Even a policy saying that any new dependencies should add themselves to a spreadsheet -- or else they'll be broken whenever we feel like it -- would be progress.)

 

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