Microsoft.Build.NoTargets missing in prep-source-build on 10.0.0-preview.6 #2009
Description
Describe the Bug
When building 10.0.0-preview.6 in a sandbox without networking, I get these errors:
/build/dotnet-10.0.0-preview.6.25358.103/eng/init-detect-binaries.proj : error : Could not resolve SDK "Microsoft.Build.NoTargets". Exactly one of the probing messages below indicates why we could not resolve the SDK. Investigate and resolve that message to correctly specify the SDK.
/build/dotnet-10.0.0-preview.6.25358.103/eng/init-detect-binaries.proj : error : SDK resolver "Microsoft.DotNet.MSBuildWorkloadSdkResolver" returned null.
/build/dotnet-10.0.0-preview.6.25358.103/eng/init-detect-binaries.proj : error : Unable to find package Microsoft.Build.NoTargets. No packages exist with this id in source(s): dotnet-eng, dotnet-libraries, dotnet-public
/build/dotnet-10.0.0-preview.6.25358.103/eng/init-detect-binaries.proj : warning : Unable to load the service index for source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json.
/build/dotnet-10.0.0-preview.6.25358.103/eng/init-detect-binaries.proj : warning : Unable to load the service index for source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json.
/build/dotnet-10.0.0-preview.6.25358.103/eng/init-detect-binaries.proj : warning : Unable to load the service index for source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries/nuget/v3/index.json.
/build/dotnet-10.0.0-preview.6.25358.103/eng/init-detect-binaries.proj : error MSB4236: The SDK 'Microsoft.Build.NoTargets' specified could not be found.
This worked okay on preview 5.
Steps to Reproduce
Build dotnetCorePackages.dotnet_10.stage0.vmr from NixOS/nixpkgs#426786
Other Information
I believe this is something to do with init-detect-binaries.proj being called from prep-source-build.sh without the bootstrap packages being available.