Support for armv7l?

[robbiet480]

Any chance support for armv7l can be added? Would provide a faster way to get going on Raspberry Pi.

[robotastic]

Definitely! Any good pointers on how to have DockerHub automatically build for those platforms? Do I need to cross-compile on my Mac.

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On Jun 2, 2020, at 12:22 AM, Robbie Trencheny ***@***.***> wrote: Any chance support for armv7l can be added? Would provide a faster way to get going on Raspberry Pi. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAA3TXG36YVS2VXXOHBZDRLRUR5AVANCNFSM4NQLUHKA>.

[robbiet480]

I looked into this a bit today and seems the easiest way to go about this would be to use docker buildx. Gonna do some tests locally and see how hard it is to get this and then trunk-recorder building.

[robbiet480]

This was easier than I thought it would be! Took less than 30 minutes to have complete builds uploaded to Docker Hub. Here's all the commands I had to run locally on my Mac to get builds going:

1. Enable experimental mode on Docker Desktop for Mac: Docker menu bar item > Preferences > Command Line and then turn on the Enable experimental features toggle. Click Apply & Restart.
2. docker buildx create --name testbuilder
3. docker buildx use testbuilder
4. docker buildx inspect --bootstrap (the bootstrap is the key, it'll create the VMs used for builds)
5. docker login if you aren't already
6. docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t robotastic/docker-gnuradio --push .
7. The build took 791.4s and get automatically uploaded to Docker Hub. You can view mine here.

Figured it out thanks to docker buildx docs and this article that shows exactly how to build for rPi.

[robbiet480]

As for trunk-recorder, it took a lot longer to build: 75 minutes! Weirdly, building armv7 took almost 20 minutes less than building for arm64 (amd64 only took 200 seconds). I don't think its the limits of my machine either, i'm on a brand new fully loaded 16" MacBook Pro. It's extremely likely there's cross compile flags that could be set to speed up the time. Thankfully, I didn't have to make changes there either, just ran docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t robotastic/trunk-recorder --push .. I'd suggest running that as part of a Travis or other CI run since Docker Hub builds don't yet support buildx. More info on that at docker/hub-feedback#1874

You can view mine here.

[robbiet480]

Continuing this at robotastic/trunk-recorder#365