No executable found matching command "dotnet-/app/Build\ClearPluginAssemblies.dll" Docker

Question

I'm trying to run my ASP.NET Core 2.1 application with docker image. For that I have docker file with the following content:

FROM microsoft/dotnet:2.1-sdk AS build
WORKDIR /app

# copy csproj and restore as distinct layers
COPY . .
RUN dotnet restore

# copy everything else and build app
COPY Presentation/MyProject.Web/. ./Presentation/MyProject.Web/
WORKDIR /app/Presentation/MyProject.Web
RUN dotnet publish -c Release -o out

# Build runtime image
FROM microsoft/dotnet:aspnetcore-runtime
WORKDIR /app
COPY --from=build /app/Presentation/MyProject.Web/out .
ENTRYPOINT ["dotnet", "MyProject.Web.dll"] 

But when execute the command docker build -t MyProject-web . it gives me an error:

The command '/bin/sh -c dotnet publish -c Release -o out' returned a non-zero code: 1

---

 MyProject.Web -> /app/Presentation/MyProject.Web/bin/Release/netcoreapp2.1/MyProject.Web.dll
  No executable found matching command "dotnet-/app/Build\ClearPluginAssemblies.dll"
/app/Build/ClearPluginAssemblies.proj(21,5): error MSB3073: The command "dotnet "/app/Build\ClearPluginAssemblies.dll" "OutputPath=/app/Build/../Presentation/MyProject.Web/bin/Release/netcoreapp2.1/|PluginPath=/app/Presentation/MyProject.Web/Plugins/DiscountRules.CustomerRoles/;/app/Presentation/MyProject.Web/Plugins/ExchangeRate.EcbExchange/;/app/Presentation/MyProject.Web/Plugins/ExternalAuth.Facebook/;/app/Presentation/MyProject.Web/Plugins/Payments.CheckMoneyOrder/;/app/Presentation/MyProject.Web/Plugins/Payments.Manual/;/app/Presentation/MyProject.Web/Plugins/Payments.PayPalStandard/;/app/Presentation/MyProject.Web/Plugins/Payments.Square/;/app/Presentation/MyProject.Web/Plugins/Payments.Worldpay/;/app/Presentation/MyProject.Web/Plugins/Pickup.PickupInStore/;/app/Presentation/MyProject.Web/Plugins/Shipping.FixedByWeightByTotal/;/app/Presentation/MyProject.Web/Plugins/Shipping.UPS/;/app/Presentation/MyProject.Web/Plugins/Tax.FixedOrByCountryStateZip/;/app/Presentation/MyProject.Web/Plugins/Widgets.GoogleAnalytics/;/app/Presentation/MyProject.Web/Plugins/Widgets.NivoSlider/|SaveLocalesFolders="" exited with code 1.
The command '/bin/sh -c dotnet publish -c Release -o out' returned a non-zero code: 1

Edit 1: Here is my project structure:

Build
    ClearPluginAssemblies
Libraries
    MyProject.Core
    MyProject.Data
    MyProject.Services
Plugins
    MyProject.Plugin.Discount
    MyProject.Plugin.Payment
    ..
Presentation
    MyProject.Web   
    MyProject.Web.Framework
Tests

Edit:2 Web project file:

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

  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>        
    <Description>MyProject.Web is also an MVC web application project, a presentation layer for public store and admin area.</Description>                
  </PropertyGroup>

  <ItemGroup>
    <ProjectReference Include="..\..\Libraries\MyProject.Core\MyProject.Core.csproj" />
    <ProjectReference Include="..\..\Libraries\MyProject.Data\MyProject.Data.csproj" />
    <ProjectReference Include="..\..\Libraries\MyProject.Services\MyProject.Services.csproj" />
    <ProjectReference Include="..\MyProject.Web.Framework\MyProject.Web.Framework.csproj" />
  </ItemGroup>

  <ItemGroup>
    <!-- We copy the entire \App_Data directory. But we ignore JSON files and data protection keys  -->
    <Content Include="App_Data\**" CopyToPublishDirectory="PreserveNewest" Exclude="App_Data\*.json" />
    <Content Update="App_Data\*.json" CopyToPublishDirectory="Never" />
    <Content Update="App_Data\DataProtectionKeys\*.xml" CopyToPublishDirectory="Never" />

    <Compile Remove="Plugins\**" />
    <EmbeddedResource Remove="Plugins\**" />
    <None Remove="Plugins\**" />

    <Content Include="Plugins\**" CopyToPublishDirectory="PreserveNewest" Exclude="Plugins\**\*.config;Plugins\**\*.cshtml;Plugins\**\*.json" />
    <Content Include="Themes\**" CopyToPublishDirectory="PreserveNewest" Exclude="Themes\**\*.config;Themes\**\*.cshtml;Themes\**\*.json" />

    <!-- We copy the \Logs directory -->
    <Content Include="Logs\**" CopyToPublishDirectory="PreserveNewest" />

    <None Update="Areas\Admin\sitemap.config">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
  </ItemGroup>

  <ItemGroup>
    <Folder Include="Plugins\" />
  </ItemGroup>

  <!-- This target execute after "Build" target.
    We use it to clean up folder with plugins from unnecessary and obsolete libraries. -->
  <Target Name="NopTarget" AfterTargets="Build">
    <ItemGroup>
      <!-- Get plugin description files to get plugin paths -->
      <PluginsDescription Include="$(MSBuildProjectDirectory)\Plugins\**\plugin.json;" />      
      <!-- Get paths for all plugins -->
      <PluginsFolders Include="@(PluginsDescription->'%(relativedir)')" />

      <!-- Get all the libraries from the shadow copy folder to remove them,
        because depending on the settings, this may not happen when the application is starting,
        but this can lead to unpredictable results during debugging of the project. -->
      <ShadowCopiesLibraries Include="$(MSBuildProjectDirectory)\Plugins\bin\*.*" Exclude="$(MSBuildProjectDirectory)\Plugins\bin\placeholder.txt" />
    </ItemGroup>
    <PropertyGroup>
      <PluginsFolders>@(PluginsFolders)</PluginsFolders>
    </PropertyGroup>
    <!-- Delete libraries from the shadow copy folder -->
    <Delete Files="@(ShadowCopiesLibraries)" />
    <!-- When .NET Core builds a project, it copies all referenced libraries to the output folder.
      For plugins it creates too many unnecessary files that just take up space.
      At the moment you can't disable this behavior. That's why we have to manually delete all unnecessary libraries from plugin output directories. -->
    <MSBuild Projects="$(MSBuildProjectDirectory)\..\..\Build\ClearPluginAssemblies.proj" Properties="PluginPath=$(PluginsFolders)" Targets="NopClear" />
  </Target>

  <PropertyGroup>  
    <ConcurrentGarbageCollection>false</ConcurrentGarbageCollection>
  </PropertyGroup>

</Project> 

Answer 1

This looks more like a dotnet publish issue then an actually issue with docker.

If you search on the actual error that dotnet cli shows MSB3073, you can find that it's often related to post build events. In many cases, the path to each folder/assembly referenced in the post build event is not correct.

If we look closer at where we are when the publish command is executed

WORKDIR /app/Presentation/MyProject.Web

And then for example look at the PluginPath in the error message

..PluginPath=/app/Presentation/MyProject.Web/Plugins/DiscountRules.CustomerRoles/;..

You can then see that the path is not inline from where the command is executed.

One solutions would be to add absolute path or make them relative from where the publish command is executed. You could also specify a specific post/pre-events for each configuration, here's an answer regarding publish-events