Add netcoreapp3.0 target for nbgv

[clairernovotny]

.NET Core global tools will auto roll-forward to the next minor. So for people that only have netcoreapp2.2, the current netcoreapp2.1 target will work just fine. Major versions do not roll forward, so if a user only has netcoreapp3.0, then the tool will fail.

The solution is to either have users with both a .NET Core 2.x SDK and a 3.x SDK or to have tools multi-target. For ease of users, I'm recommending all .NET Core global tools add a netcoreapp3.0 target.

/cc @KathleenDollard

[clairernovotny]

I can add this as a PR

[KathleenDollard]

We have started of recommendations on tools and anticipate suggesting tools target 2.1 and 3.0, although another solution for customers is to keep a 2.1 runtime available for tools

…

________________________________ From: Oren Novotny <[email protected]> Sent: Saturday, December 15, 2018 10:28:39 AM To: AArnott/Nerdbank.GitVersioning Cc: Kathleen Dollard; Mention Subject: [AArnott/Nerdbank.GitVersioning] Add netcoreapp3.0 target for nbgv (#277) .NET Core global tools will auto roll-forward to the next minor. So for people that only have netcoreapp2.2, the current netcoreapp2.1 target will work just fine. Major versions do not roll forward, so if a user only has netcoreapp3.0, then the tool will fail. The solution is to either have users with both a .NET Core 2.x SDK and a 3.x SDK or to have tools multi-target. For ease of users, I'm recommending all .NET Core global tools add a netcoreapp3.0 target. /cc @KathleenDollard<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FKathleenDollard&data=02%7C01%7Ckathleen.dollard%40microsoft.com%7Ca971529371b547cf712d08d662bb22c5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636804953217886792&sdata=utwX8mHJDUueaFaUVOIwcAJ3tvMK31qHQzTkAf2xJS8%3D&reserved=0> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FAArnott%2FNerdbank.GitVersioning%2Fissues%2F277&data=02%7C01%7Ckathleen.dollard%40microsoft.com%7Ca971529371b547cf712d08d662bb22c5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636804953217886792&sdata=Ut71kVE6bnPc%2BF0dC7v80ljVIErqR85mO7ML0vwm%2BKY%3D&reserved=0>, or mute the thread<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAFktXiParMdstih35nKdp5VpHDXyEBudks5u5T9XgaJpZM4ZU2JR&data=02%7C01%7Ckathleen.dollard%40microsoft.com%7Ca971529371b547cf712d08d662bb22c5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636804953217896806&sdata=EkKGW%2FqPRzYqgr7b2XwXVg47gE45BZ3SN3az%2FVCRchU%3D&reserved=0>.

[ctaggart]

It would be nice to be able to do this:

docker run --rm -it mcr.microsoft.com/dotnet/core/sdk:3.0.100-preview3-alpine3.9 sh
dotnet tool install -g nbgv
$HOME/.dotnet/tools/nbgv get-version

But it does not currently work:

/ # dotnet tool install -g nbgv
Tools directory '/root/.dotnet/tools' is not currently on the PATH environment variable.
If you are using bash, you can add it to your profile by running the following command:

cat << \EOF >> ~/.bash_profile
# Add .NET Core SDK tools
export PATH="$PATH:/root/.dotnet/tools"
EOF

You can add it to the current session by running the following command:

export PATH="$PATH:/root/.dotnet/tools"

You can invoke the tool using the following command: nbgv
Tool 'nbgv' (version '2.3.138') was successfully installed.
/ # $HOME/.dotnet/tools/nbgv get-version
It was not possible to find any compatible framework version
The specified framework 'Microsoft.NETCore.App', version '2.1.0' was not found.
  - Check application dependencies and target a framework version installed at:
      /usr/share/dotnet
  - The .NET Core Runtime and SDK can be installed from:
      https://aka.ms/dotnet-download
  - The following versions are installed:
      3.0.0-preview3-27503-5 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  - Installing .NET Core prerequisites might help resolve this problem:
      https://go.microsoft.com/fwlink/?linkid=2063370