Home: Access to dgspec.json is denied when building docker image

[blackchoey]

Details about Problem

On Azure Pipelines hosted windows-2019 agent, building a newly created solution in docker will result in Access to the path 'C:\app\obj\testmodule.csproj.nuget.dgspec.json' is denied. error. This may be a regression of issue https://github.com/NuGet/Home/issues/7836

NuGet product used (NuGet.exe | VS UI | Package Manager Console | dotnet.exe): dotnet.exe

NuGet version (x.x.x.xxx): 5.3.0.4

dotnet.exe --version (if appropriate): 3.0.100 (on build agent). The docker image uses image microsoft/dotnet:2.1-sdk to build solution.

VS version (if appropriate): Not using VS.

OS version (i.e. win10 v1607 (14393.321)): windows 1809

Worked before? If so, with which NuGet version: Worked before, but I couldn't get previous runtime information.

Detailed repro steps so we can see the same problem

1. Create a new build definition in Azure Pipelines. Select hosted agent windows-2019 to run the build.

2. Add following powershell task

steps:
- powershell: |
   dotnet new -i Microsoft.Azure.IoT.Edge.Module

   dotnet new aziotedgemodule -n testmodule -r localhost:5000/testmodule

   cd testmodule

   docker build --rm -f "./Dockerfile.windows-amd64" -t localhost:5000/testmodule:0.0.1-windows-amd64 .
  displayName: 'PowerShell Script'

1. Queue a new build

Actual behavior:
The docker build command failed with error Access to the path 'C:\app\obj\testmodule.csproj.nuget.dgspec.json' is denied.

Expected behavior:
The build finished successfully
...

Other suggested things

Sample Project

Run the dotnet new commands in repro steps and you can get the sample solution.

[riverar]

Any updates on this? Seeing this with mcr.microsoft.com/dotnet/core/sdk:3.1, with a simple Dockerfile (create an app folder locally with a sample dotnet project):

#escape=`
FROM mcr.microsoft.com/dotnet/core/sdk:3.1
ADD app ./app
RUN dotnet build ./app

Output:

Microsoft (R) Build Engine version 16.4.0+e901037fe for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

C:\Program Files\dotnet\sdk\3.1.101\NuGet.targets(123,5): error : Access to the path 'C:\app\obj\testharness.csproj.nuget.dgspec.json' is denied. [C:\app\testharness.csproj]

Build FAILED.

C:\Program Files\dotnet\sdk\3.1.101\NuGet.targets(123,5): error : Access to the path 'C:\app\obj\testharness.csproj.nuget.dgspec.json' is denied. [C:\app\testharness.csproj]
    0 Warning(s)
    1 Error(s)

Ping @onovotny @dominoFire

[riverar]

This was a result of me copying over existing obj/bin folders, from a local build. Added a .dockerignore to ignore those folders. Experience could be improved here.

[nkolev92]

Hey @blackchoey

Thank you filing this issue.

As @riverar suggested, this is a consequence of the permissions model in docker.
We'd recommend ensuring that the obj/bin folders are not copied over in the image.