[BUG]: UseDotNet task installs x64 build on Mac OS arm64

[jasongin]

On a macOS arm64 (M1/M2) build agent, the task incorrectly detects the architecture as x64, and downloads the x64 build of .NET. It can run successfully via the Rosetta compatibility mode, but is probably not what anyone wants, and defeats the purpose of using a (more expensive) Mac M1 build agent.

Task name

UseDotNet

Task version

2.228.0

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

macOS 12.6.9

Task log

Tool to install: .NET Core sdk version 8.0.x.
Found version 8.0.100-rc.2.23502.2 in channel 8.0 for user specified version spec: 8.0.x
Version 8.0.100-rc.2.23502.2 was not found in cache.
Getting URL to download .NET Core sdk version: 8.0.100-rc.2.23502.2.
Detecting OS platform to find correct download package for the OS.
/Users/runner/work/_tasks/UseDotNet_b0ce7256-7898-45d3-9cb5-176b752bfea6/2.228.0/externals/get-os-distro.sh
Primary:osx-x64
Legacy:osx-x64
Detected platform (Primary): osx-x64
Detected platform (Legacy): osx-x64
Downloading: https://download.visualstudio.microsoft.com/download/pr/2cb4fcbd-ba5d-41c4-9907-8120aa4b5f23/98fd104ada4105462cefb1123a0df533/dotnet-sdk-8.0.100-rc.2.23502.2-osx-x64.tar.gz

Aditional info

This appears to be caused by an incomplete list of ARM64 detection strings in
get-os-distro.h get_machine_architecture()

Specifically, uname -m returns arm64 on a Mac arm64 (M1/M2) system.
Reference: https://stackoverflow.com/questions/65259300/detect-apple-silicon-from-command-line

[svaldetero]

This is currently an issue for me on my self-hosted macstudio agent. It causes my net8-ios build to freeze and eventually time out. This has been plaguing our builds for months. My workaround is to not run the UseDontNet task if on the self-hosted agent, but would prefer if it would install the correct dotnet version.

[merlynomsft]

The change has been merged and will be in the next release of the task. Thank you for the contribution!

[svaldetero]

@merlynomsft when will this get released? It was merged 2 weeks ago but I still see task 2.232.0 being used on my ADO runs.

[merlynomsft]

We roll out task updates incrementally, that said, this update should show up soon. @max-zaytsev, do you have an estimate when this will be available to everyone?

[max-zaytsev]

@svaldetero the fix should be available now.