Testing engine releases for Flutter channels

[jwinarske]

What is the official way to test for a channel roll?

Is this it?

https://github.com/flutter/flutter/blob/beta/bin/internal/engine.version
https://github.com/flutter/flutter/blob/stable/bin/internal/engine.version

I wouldn't expect the two channels to have the same value

Also what about roll backs?

[TahaTesser]

Hi @jwinarske
The reason why currently stable and beta have the same value because they're on the same version right now

As you can see, the same framework, engine, and release timestamp (beta is likely to receive another update soon)
stable

[✓] Flutter (Channel stable, 2.2.2, on Microsoft Windows [Version 10.0.19043.1055], locale en-US)
    • Flutter version 2.2.2 at C:\Users\Taha\Code\flutter_stable
    • Framework revision d79295af24 (7 days ago), 2021-06-11 08:56:01 -0700
    • Engine revision 91c9fc8fe0
    • Dart version 2.13.3

beta

[✓] Flutter (Channel beta, 2.2.2, on Microsoft Windows [Version 10.0.19043.1055], locale en-US)
    • Flutter version 2.2.2 at C:\Users\Taha\Code\flutter_beta
    • Framework revision d79295af24 (7 days ago), 2021-06-11 08:56:01 -0700
    • Engine revision 91c9fc8fe0
    • Dart version 2.13.3

What is the official way to test for a channel roll?

Can you please clarify what you testing with this? engine?
Thank you

[jwinarske]

Sorry I should have explained better. I have a CI job that checks for channel roll every 15 minutes using the mentioned endpoints, for the purpose of re-spinning engine build. Just wondering if using the mentioned endpoints is the best / most direct way?

Also for desktop debug builds I use this endpoint:
https://storage.googleapis.com/flutter_infra/flutter/91c9fc8fe011352879e3bb6660966eafc0847233/linux-x64/linux-x64-embedder

A couple of channel rolls ago there was no artifact for a couple of days, and for the latest roll there is no build artifact at all.

Is the linux-x64-embedder build artifact deprecated (removed from pipeline builds)?

[stuartmorgan]

What is a "channel roll"? AFAIK there's no Flutter process with that name, so it's not really clear what the question is here without a definition of what exactly it is that you want to do.

[TahaTesser]

The author wants to test check the version for the engine, every 15 minutes using the following links

https://github.com/flutter/flutter/blob/beta/bin/internal/engine.version
https://github.com/flutter/flutter/blob/stable/bin/internal/engine.version

They want to know if this is the best way to do the check for the engine version

@jwinarske
Correct me If I'm mistaken

[jwinarske]

@TahaTesser you are correct.

The follow up to that is the build artifact missing, and is that part of a deprecation plan?

[TahaTesser]

@jwinarske
I am not sure about the missing artifact, somebody from infra could answer it better

[stuartmorgan]

What is the official way to test for a channel roll?

There's no "official" way to be informed of an engine rolling having been released to a specific channel, but

Is this it?

https://github.com/flutter/flutter/blob/beta/bin/internal/engine.version
https://github.com/flutter/flutter/blob/stable/bin/internal/engine.version

Those files are (currently; there's no guarantee that the format of internal wouldn't change in the future) the source of truth for what version of the engine is being used in a given version of Flutter.

Also what about roll backs?

There is no difference from the perspective of the flutter tool between a roll and a rollback. The value in that file changes, and a new version is used.

Is the linux-x64-embedder build artifact deprecated (removed from pipeline builds)?

No, but going forward artifacts are uploaded to flutter_infra_release, not flutter_infra. I'll update the custom embedder wiki page.