New `--os` argument for `dotnet restore`

[joegoldman2]

Summary

Currently, the dotnet restore command lacks an option to specify the target operating system directly, similar to the existing options in dotnet build and dotnet publish. I propose the addition of a new argument: --os <OS>.

Motivation

The motivation behind this request is to align the dotnet restore command with the capabilities of dotnet build and dotnet publish, which both support the --os argument. While dotnet restore already has the -r|--runtime option to specify the target runtime identifier, having a dedicated --os argument would provide consistency.

Usage

dotnet restore --os linux

Additional Information

N/A

[baronfel]

totally agree - both the --arch and --os options should be unified across all commands that can take a --runtime argument currently.

@joegoldman2 what version of the SDK did you discover this on?

[joegoldman2]

I'm using the latest stable version 8.100.0.

[baronfel]

So I was looking into some additional testing for #37429 and realized something -- restore allows multiple --runtime options, so --arch and --os either have reduced utility (meaning they should either not be present here or only contribute part of the full set of runtimes). pack is similar - it only surfaces --runtime from the 'implicit restore' that can happen under the covers. We should make sure that adding --os and --arch works correctly when multiple --runtime options are provided.