Support reproducible flow-build-info.json and stats.json

[lightoze]

Currently (v14) generated flow-build-info.json and stats.json entries are randomly reordered during build. In containerized environment it means that every build produces an unique image which creates problems both in development and CD workflows.

This should be also taken into account in relation to #6398

[denis-anisimov]

As I understand you would like to have the same content of the flow-build-info.json and stats.json files, right ?

[lightoze]

@denis-anisimov Right. It appears to me that the only difference I get now is content ordering.

As a more generic requirement, you could create a test where you build project twice and expect it to produce exact same artifact. Results may differ though depending on how much "from scratch" you are building each time - at the moment I am testing in dev environment where project is not cleaned between rebuilds.

[denis-anisimov]

OK, thanks for clarification.

[lightoze]

I've got back to this issue, tested with Vaadin 21.0.6, flow-build-info.json still seems to be randomly reordered after each build. When building to containers it forces a new set of layers to be created on each build, even when particular application in multi-module repository is unchanged.

For testing purposes I've created a test project which allows quickly deploying a test app into a Kubernetes cluster using Skaffold: https://github.com/lightoze/vaadin-build-demo. After byte to byte comparison of images produces by a clean build it is seen that flow-build-info.json is the only file that differs between the builds.

[Artur-]

In Vaadin 22, stats.json has been reduced to almost nothing

#12431 should make the jsModule and cssImports parts deterministic. Is there any other part that keeps changing?

[lightoze]

Looks like it's only jsModule and cssImports so #12431 should help. I remember stats.json being non-deterministic in the past but now with V21 it seems stable, at least for the test project.

[vaadin-bot]

This ticket/PR has been released with platform 23.0.0.alpha1 and is also targeting the upcoming stable 23.0.0 version.

[vaadin-bot]

This ticket/PR has been released with Vaadin 22.0.24.