`dotnet/dotnet` experiments

VMR experiments.md

ℹ️ Instructions for https://twitter.com/premun_/status/1626560566469791746

Using Codespaces

1. Create a Codespace from https://github.com/dotnet/dotnet
2. Change the NullReferenceException.cs file
   code /workspaces/dotnet/src/runtime/src/libraries/System.Private.CoreLib/src/System/NullReferenceException.cs
3. Build the .NET SDK (~45 minutes)
   cd /workspaces/dotnet && ./prep.sh && ./build.sh --online
4. Unpack the SDK
   mkdir /workspaces/.dotnet && tar -zxf artifacts/x64/Release/dotnet-sdk-* -C /workspaces/.dotnet
5. Create a new project:
   mkdir /workspaces/foo && cd /workspaces/foo && /workspaces/.dotnet/dotnet new console
6. Change Program.cs to throw an NRE
   code Program.cs
   You can put something like Console.WriteLine(((string?)null)!.Length);
7. Run it /workspaces/.dotnet/dotnet run
   🔥🔥🔥

Using Docker

1. Run the container:
   docker run --rm -itv vmr:/vmr -w /vmr mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-36
2. Clone the monorepo
   git clone https://github.com/dotnet/dotnet .
3. Change the NullReferenceException.cs file
   vi /vmr/src/runtime/src/libraries/System.Private.CoreLib/src/System/NullReferenceException.cs
4. Build the .NET SDK
   ./prep.sh && ./build.sh --online --clean-while-building
5. Unpack the SDK
   mkdir -p $HOME/.dotnet && tar -zxf artifacts/x64/Release/dotnet-sdk-* -C $HOME/.dotnet
6. Create a new project:
   mkdir $HOME/foo && cd $HOME/foo && $HOME/.dotnet/dotnet new console
7. Change Program.cs to throw an NRE
   echo 'Console.WriteLine(((string?)null)!.Length);' > Program.cs
8. Run it $HOME/.dotnet/dotnet run
   🔥🔥🔥