MVC application instructions for Raspberry Pi

[Tealons]

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[dnfclas]

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[dnfclas]

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[richlander]

@livarcocc I tried to follow these instructions. I was unable. Can you take a look?

C:\mvcapp>dotnet publish -c release -r linux-arm
Microsoft (R) Build Engine version 15.3.388.41745 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  mvcapp -> C:\mvcapp\bin\release\netcoreapp2.0\linux-arm\mvcapp.dll
  Could not find required library hostpolicy.dll in 2 probing paths:

    C:\Users\rich\.nuget\packages

    C:\Users\rich\.dotnet\NuGetFallbackFolder

  A fatal error was encountered. The library 'hostpolicy.dll' required to execute the application was not found in 'C:\mvcapp\bin\release\netcoreapp2.0\linux-arm\'.

C:\Users\rich\.dotnet\NuGetFallbackFolder\microsoft.aspnetcore.mvc.razor.viewcompilation\2.0.0-preview2-final\build\netcoreapp2.0\Microsoft.AspNetCore.Mvc.Razor.ViewCompilation.targets(27,5): error MSB3073: The command "dotnet exec --runtimeconfig "C:\mvcapp\bin\release\netcoreapp2.0\linux-arm\mvcapp.runtimeconfig.json" --depsfile "C:\mvcapp\bin\release\netcoreapp2.0\linux-arm\mvcapp.deps.json" "C:\Users\rich\.dotnet\NuGetFallbackFolder\microsoft.aspnetcore.mvc.razor.viewcompilation\2.0.0-preview2-final\build\netcoreapp2.0\../../lib/netcoreapp2.0/Microsoft.AspNetCore.Mvc.Razor.ViewCompilation.dll" @"obj\release\netcoreapp2.0\linux-arm\microsoft.aspnetcore.mvc.razor.viewcompilation.rsp"" exited with code -2147450749. [C:\mvcapp\mvcapp.csproj]

C:\mvcapp>dotnet --version
2.0.0-preview2-006497

[livarcocc]

@vijayrkn @mlorbetske Do you guys own the view compilation tool? The error above is happening when we try to run that tool during publish.

[vijayrkn]

+owners of razor view compilation tool
@NTaylorMullen @pranavkm

[pranavkm]

@livarcocc this is a known issue (aspnet/MvcPrecompilation#102) and isn't getting fixed until 2.1.0. Disabling the tool (like you did via MvcRazorCompileOnPublish is an acceptable option for now).

[vijayrkn]

Currently all webprojects have this set to true by default. Should we change this?
https://github.com/aspnet/websdk/blob/afbcec9b0951d09088f26e98e6aca6114e0d32ee/src/ProjectSystem/Microsoft.NET.Sdk.Web.ProjectSystem.Targets/netstandard1.0/Microsoft.NET.Sdk.Web.ProjectSystem.props#L24

[pranavkm]

cc @DamianEdwards. I think we were ok shipping it this way for 2.0.

[richlander]

Does that mean we cannot publish asp.net standalone apps (by default) for linux+arm? Is that the scenario we are discussing here?

[pranavkm]

@richlander - there's an bug with the precompilation tool that prevents publishing for a target that's not the current OS. There are workarounds available for it (aspnet/MvcPrecompilation#102 (comment)) for it. The other alternative is to disable precompilation as part of publish which is what this PR is attempting to do.

[richlander]

Got it. Is this issue written up anywhere (besides here)?

[Petermarcu]

I'm going to close this PR for now since its been dead since June. If someone wants to finish it, please go ahead and open a new PR.