Auto restore does not work for .NET Core projects when building via MSBuild

Description

I have .NET Core solution with netstandard2.0 project using Paket to manage dependencies. I followed instructions on https://fsprojects.github.io/Paket/paket-and-dotnet-cli.html to setup automatic restore of packages. When I build solution from Visual Studio it works fine, but when I build it from command line on CI server using msbuild solution.sln it fails with:

C:\Program Files\dotnet\sdk\2.0.0\Sdks\Microsoft.NET.Sdk\build\Microsoft.PackageDependencyResolution.targets(323,5): er
ror : Assets file 'e:\Temp\PaketTest\PaketRestoreTest\TestProject\obj\project.assets.json' not found. Run a NuGet packa
ge restore to generate this file. [e:\Temp\PaketTest\PaketRestoreTest\TestProject\TestProject.csproj]

Repro steps

I attached PaketRestoreTest.zip with sample solution to reproduce this issue.

1. Have Visual Studio 2017 Update 3 and .NET Core SDK 2.0
2. Extract attached solution
3. Open Visual Studio Command Prompt and run msbuild PaketRestoreTest.sln

Expected behavior

I would expect that building from command line properly restores packages and build succeeds.

Actual behavior

Build from command line fails, unless you explicitly call msbuild PaketRestoreTest.sln /t:Restore or dotnet restore before calling msbuild PaketRestoreTest.sln.

Known workarounds

Call msbuild PaketRestoreTest.sln /t:Restore or dotnet restore before calling msbuild PaketRestoreTest.sln.

[Katulus]

I’m using common build scripts using msbuild. I could do conditional branch to build some projects using dotnet build but then I rather add conditional step to call msbuild /t:Restore (as I did as the workaround anyway).

[davkean]

dotnet build will auto-restore, msbuild foo.csproj does not currently.