Helix-related builds failing for Python Wheels install of cryptography on ARM32

[mthalman]

It's failing on this line of the Dockerfile:

dotnet-buildtools-prereqs-docker/src/debian/10/helix/arm32v7/Dockerfile

Line 36 in 560e5e7

RUN ln -sf /usr/bin/python3 /usr/bin/python && \

This is failing on all Debian/Ubuntu ARM32 Helix Dockerfiles.

Here's the relevant part of the error output:

2020-08-17T21:13:27.8108471Z �[91mERROR: Could not build wheels for cryptography which use PEP 517 and cannot be installed directly
2020-08-17T21:13:27.8110708Z �[0mFailed to build cryptography

Attached is the log output:
log.txt

[MichaelSimons]

@MattGal - Can you please take a look at this?

[MattGal]

Hrm, I suspect unintended fallout from the --extra-index-url changes I made recently, though weird it's just now showing up. How might I get some hardware to try this out on?

[MichaelSimons]

For the most part Docker does a good job of supporting arm via QEMU. My suggestion is to try building in a Win 10 Linux Containers environment.

[mthalman]

@MattGal - Any progress on this? This is getting in the way of producing other images because they all get built in the same job.

[MattGal]

I was able to reproduce the problem, but no progress made. My sense is we should disable the DockerFiles used and pick this back up when we actually have a real need to regenerate them. I'll chat with @Chrisboh and get back to you.

[MichaelSimons]

@MattGal - Did you get a chance to discuss w/@Chrisboh on this? What is the plan?

[MattGal]

Ooops, too many distractions. Here's my plan:

• I see updates on the broken python libraries since my last change; I'm going to try this again and see what I see.
• If this is fixable, I will make a PR that re-enables the images
• If not, I will reach out to the owners and create an issue for the python cryptography library.

I should be able to do these three things before EOD and get back to you.

[MattGal]

It is fixable, I didn't troll the internet enough the first time it happened to find the workarounds.

The bug is pypa/wheel#367 . I am applying the suggested workaround and reenabling the images via PR now.

[MattGal]

#365

[MattGal]

PR merged.