v3 build doesn't work without 2.2 on the box

[jeffhollan]

If you try to do a dotnet build and only have 3.0 on the box, it throws an error. If you are using SDK version 1.0.29 it just complains it doesn't have .NET Core 2.1. If you upgrade the SDK to 3.0.0-preview1 it complains about this (below). Workaround is to also have 2.x on the machine:

error message

> Restore completed in 18.07 sec for /home/vsts/work/1/s/devops3test.csproj. devops3test -> /home/vsts/work/1/s/bin/Release/netcoreapp3.0/bin/devops3test.dll /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : It was not possible to find any compatible framework version [/home/vsts/work/1/s/devops3test.csproj] /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : The specified framework 'Microsoft.NETCore.App', version '2.0.0' was not found. [/home/vsts/work/1/s/devops3test.csproj] /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : - The following frameworks were found: [/home/vsts/work/1/s/devops3test.csproj] /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : 3.0.0 at [/opt/hostedtoolcache/dotnet/shared/Microsoft.NETCore.App] [/home/vsts/work/1/s/devops3test.csproj] /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : [/home/vsts/work/1/s/devops3test.csproj] /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : You can resolve the problem by installing the specified framework and/or SDK. [/home/vsts/work/1/s/devops3test.csproj] /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : [/home/vsts/work/1/s/devops3test.csproj] /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : The .NET Core frameworks can be found at: [/home/vsts/work/1/s/devops3test.csproj] /home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): warning : - https://aka.ms/dotnet-download [/home/vsts/work/1/s/devops3test.csproj] Debug output from extension.json generator:

/home/vsts/.nuget/packages/microsoft.azure.webjobs.script.extensionsmetadatagenerator/1.1.2/build/Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator.targets(33,5): error : Metadata generation failed. Exit code: '150' Error: 'It was not possible to find any compatible framework versionThe specified framework 'Microsoft.NETCore.App', version '2.0.0' was not found. - The following frameworks were found: 3.0.0 at [/opt/hostedtoolcache/dotnet/shared/Microsoft.NETCore.App]You can resolve the problem by installing the specified framework and/or SDK.The .NET Core frameworks can be found at: - https://aka.ms/dotnet-download' [/home/vsts/work/1/s/devops3test.csproj]

Build FAILED.

[cmendible]

Hi I can confirm that with just v3.0 installed in the box I get: "The specified framework 'Microsoft.NETCore.App', version '2.1.0' was not found" when trying to build. Once I installed the 2.2 SDK the v3 function builds.

[brettsam]

@jeffhollan -- did you have a repro of this locally? I've got a fix that it'd be good to have someone try out.

[brettsam]

I've just published Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator 1.1.3 to nuget. This should handle the scenario where .NET Core 2 is not installed.

Soon we will include this version directly in Microsoft.NET.Sdk.Functions, but in the meantime, you can add a direct nuget reference to this package version and it should unblock you. Please let me know if you continue to see this error and I can investigate.