Access to the path is denied - MacOS 11 - Net6.0

Describe the bug

When trying to perform a build of a dotnet project, it fails with Access to path is denied exception. The build should succeed.

File permissions look correct and the copy step can be performed manually successfully.

On rerun of the build command, the build succeeds. It should work first time. In some situations in other more complex repos, it fails consistently. The simple scenario is detailed below.

To Reproduce

jamie.hopper@<machineID> Misc % dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.100
 Commit:    9e8b04bbff

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  11.6
 OS Platform: Darwin
 RID:         osx.11.0-x64
 Base Path:   /usr/local/share/dotnet/sdk/6.0.100/

Host (useful for support):
  Version: 6.0.0
  Commit:  4822e3c3aa

.NET SDKs installed:
  5.0.403 [/usr/local/share/dotnet/sdk]
  6.0.100 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 5.0.12 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 5.0.12 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download
jamie.hopper@<machineID> Misc % dotnet new console -n AccessDeniedDemo  
The template "Console App" was created successfully.

Processing post-creation actions...
Running 'dotnet restore' on /Users/jamie.hopper/Src/Misc/AccessDeniedDemo/AccessDeniedDemo.csproj...
  Determining projects to restore...
  Restored /Users/jamie.hopper/Src/Misc/AccessDeniedDemo/AccessDeniedDemo.csproj (in 81 ms).
Restore succeeded.

jamie.hopper@<machineID> Misc % cd AccessDeniedDemo 
jamie.hopper@<machineID> AccessDeniedDemo % dotnet build  
Microsoft (R) Build Engine version 17.0.0+c9eb9dd64 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  All projects are up-to-date for restore.
/usr/local/share/dotnet/sdk/6.0.100/Microsoft.Common.CurrentVersion.targets(5100,5): error MSB3021: Unable to copy file "/Users/jamie.hopper/Src/Misc/AccessDeniedDemo/obj/Debug/net6.0/apphost" to "bin/Debug/net6.0/AccessDeniedDemo". Access to the path is denied. [/Users/jamie.hopper/Src/Misc/AccessDeniedDemo/AccessDeniedDemo.csproj]

Build FAILED.

/usr/local/share/dotnet/sdk/6.0.100/Microsoft.Common.CurrentVersion.targets(5100,5): error MSB3021: Unable to copy file "/Users/jamie.hopper/Src/Misc/AccessDeniedDemo/obj/Debug/net6.0/apphost" to "bin/Debug/net6.0/AccessDeniedDemo". Access to the path is denied. [/Users/jamie.hopper/Src/Misc/AccessDeniedDemo/AccessDeniedDemo.csproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:02.83

And the output from the file referenced in the exception:

jamie.hopper@<machineID> AccessDeniedDemo % ls -lh obj/Debug/net6.0        
total 504
-rw-r--r--  1 jamie.hopper  staff   959B  7 Dec 10:21 AccessDeniedDemo.AssemblyInfo.cs
-rw-r--r--  1 jamie.hopper  staff    41B  7 Dec 10:21 AccessDeniedDemo.AssemblyInfoInputs.cache
-rw-r--r--  1 jamie.hopper  staff   443B  7 Dec 10:21 AccessDeniedDemo.GeneratedMSBuildEditorConfig.editorconfig
-rw-r--r--  1 jamie.hopper  staff   287B  7 Dec 10:21 AccessDeniedDemo.GlobalUsings.g.cs
-rw-r--r--  1 jamie.hopper  staff   145B  7 Dec 10:21 AccessDeniedDemo.assets.cache
-rw-r--r--  1 jamie.hopper  staff    70K  7 Dec 10:21 AccessDeniedDemo.csproj.AssemblyReference.cache
-rw-r--r--  1 jamie.hopper  staff    41B  7 Dec 10:21 AccessDeniedDemo.csproj.CoreCompileInputs.cache
-rw-r--r--  1 jamie.hopper  staff   881B  7 Dec 10:21 AccessDeniedDemo.csproj.FileListAbsolute.txt
-rw-r--r--  1 jamie.hopper  staff   4.5K  7 Dec 10:21 AccessDeniedDemo.dll
-rw-r--r--  1 jamie.hopper  staff    10K  7 Dec 10:21 AccessDeniedDemo.pdb
-rwxr-xr-x@ 1 jamie.hopper  staff   129K  7 Dec 10:21 apphost
drwxr-xr-x  3 jamie.hopper  staff    96B  7 Dec 10:21 ref

Exceptions (if any)

Exception below:

/usr/local/share/dotnet/sdk/6.0.100/Microsoft.Common.CurrentVersion.targets(5100,5): error MSB3021: Unable to copy file "/Users/jamie.hopper/Src/Misc/AccessDeniedDemo/obj/Debug/net6.0/apphost" to "bin/Debug/net6.0/AccessDeniedDemo". Access to the path is denied. [/Users/jamie.hopper/Src/Misc/AccessDeniedDemo/AccessDeniedDemo.csproj]

Further technical details

• See in repro steps for dotnet info output
• Consistent behaviour across zsh and pwsh cli instances and from within a terminal instance within vscode
• Have attempted to uninstall and reinstall desired SDKs using dotnet-core-uninstall tool and searching for references to dotnet and manually removing these directories and their contents.

[JamieHWK]

Hi @baronfel,

Thanks for the suggestion, I performed the following steps:

• dotnet clean
• Added <UseAppHost>False</UseAppHost> to the csproj file
• dotnet build
• Built successfully
• Removed/commented out UseAppHost
• Build failed with same result

So that does indeed resolve the issue for this example which is good. It is unfortunately not the only repo that is producing this same result. I have a more complicated one, albeit not too complicated, and the csproj is listed below:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>

    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="FluentAssertions" Version="6.2.0" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
    <PackageReference Include="Selenium.WebDriver" Version="4.0.1" />
    <PackageReference Include="Selenium.WebDriver.ChromeDriver" Version="95.0.4638.6900" />
    <PackageReference Include="SpecFlow" Version="3.9.40" />
    <PackageReference Include="SpecFlow.NUnit" Version="3.9.40" />
    <PackageReference Include="SpecFlow.NUnit.Runners" Version="3.9.40" />
  </ItemGroup>

</Project>

When this runs, I get essentially the same exception however it’s nothing to do with the AppHost file. Exception is listed below:

jamie.hopper | ~/ProjectPath/ProjectName dotnet build
Microsoft (R) Build Engine version 17.0.0+c9eb9dd64 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  All projects are up-to-date for restore.
  SpecFlowFeatureFiles: Features/Example.feature
-> Using default config
  SpecFlowGeneratedFiles: Features/Example.feature.cs
  ProjectName -> /Users/jamie.hopper/ProjectPath/ProjectName/bin/Debug/net5.0/ProjectName.dll
/Users/jamie.hopper/.nuget/packages/selenium.webdriver.chromedriver/95.0.4638.6900/build/Selenium.WebDriver.ChromeDriver.targets(89,5): error MSB3021: Unable to copy file "/Users/jamie.hopper/.nuget/packages/selenium.webdriver.chromedriver/95.0.4638.6900/build/../driver/mac64/chromedriver" to "/Users/jamie.hopper/ProjectPath/ProjectName/bin/Debug/net5.0/chromedriver". Access to the path is denied. [/Users/jamie.hopper/ProjectPath/ProjectName/ProjectName.csproj]

The reason I raise this, is I am conscious that the AppHost setting may be a red herring and it’s something unrelated to that which is causing this type of failure. Doing a build on this repo with the AppHost setting set to false, unsurprisingly doesn’t effect this repo and the build still fails. Would you suggest that this isn’t an SDK issue and is something else instead?

[jjxtra]

Same error here. Gave up on vs mac and just continued to use windows vs…