`dotnet --info` includes two RID values with .NET 8

[tmds]

Previous versions of .NET list RID under Runtime Environment, and .NET 8 includes it also under Host.

.NET SDK:
 Version:   8.0.100-preview.7.23376.1
 Commit:    daebeea8ea

Runtime Environment:
 OS Name:     fedora
 OS Version:  37
 OS Platform: Linux
 RID:         fedora.37-x64
 Base Path:   /usr/lib64/dotnet/sdk/8.0.100-preview.7.23376.1/

.NET workloads installed:
There are no installed workloads to display.

Host:
  Version:      8.0.0-preview.7.23375.6
  Architecture: x64
  Commit:       65b696cf5e
  RID:          fedora.37-x64

.NET SDKs installed:
  7.0.110 [/usr/lib64/dotnet/sdk]
  8.0.100-preview.7.23376.1 [/usr/lib64/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 7.0.10 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.7.23375.9 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 7.0.10 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.7.23375.6 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
  None

Environment variables:
  DOTNET_ROOT       [/usr/lib64/dotnet]

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

Afaik, these RID values will be the same, so it can be confusing to list them twice.

This change can break scripts that try to extract the rid using dotnet --info | grep RID because they now get two lines instead of one.

cc @richlander @elinor-fung

[vitek-karas]

This change can break scripts that try to extract the rid using dotnet --info | grep RID because they now get two lines instead of one.

The dotnet --info is designed to produce human-readable output. We sometimes do change its format without considering it a breaking change - to add more information, to make it more readable, ...
I understand that people might have scripts using it, but I can't see us making the format "rigid" and not changing it at all going forward. That feels like too much of a burden to carry.

[tmds]

I understand that people might have scripts using it, but I can't see us making the format "rigid"

The --json option proposed in #33697 would solve this.

Without another way to get this information, people do try to get it from dotnet --info: https://grep.app/search?q=dotnet%20--info%20%7C%20grep%20.

When do the two rids that get output now differ in value?

[elinor-fung]

This is from having dotnet --info coming from both the sdk and the host. As mentioned, #33697 where the sdk can provide all the info would provide the machine-readable format (when an sdk is installed). But meanwhile, we could probably make the output cleaner by having the host skip printing information it 'knows' the sdk output has when there is an sdk.

[tmds]

we could probably make the output cleaner by having the host skip printing information it 'knows' the sdk output has when there is an sdk.

Yes, please do.

Printing the same value may be confusing, and it will break scripts that try to parse the value.