Bundle-Migration errors with "cannot access file...being used by another process"

Originally reported by @ryanrichard19 in https://github.com/dotnet/efcore/issues/19693#issuecomment-900396649

For some reason, dotnet publish is behaving differently between Bundle-Migration and dotnet ef migrations bundle.

PM> Bundle-Migration -Verbose
Using project 'MarketingIncentive.Data'.
Using startup project 'MarketingIncentive.API'.
Build started...
Build succeeded.
C:\Program Files\dotnet\dotnet.exe exec --depsfile C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.API.deps.json --additionalprobingpath C:\Users\mrrar\.nuget\packages --additionalprobingpath "C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages" --additionalprobingpath "C:\Program Files (x86)\Microsoft\Xamarin\NuGet" --additionalprobingpath "C:\Program Files\dotnet\sdk\NuGetFallbackFolder" --runtimeconfig C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.API.runtimeconfig.json C:\Users\mrrar\.nuget\packages\microsoft.entityframeworkcore.tools\6.0.0-preview.7.21378.4\tools\netcoreapp2.0\any\ef.dll migrations bundle --verbose --no-color --prefix-output --assembly C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll --project C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\MarketingIncentive.Data.csproj --startup-assembly C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.API.dll --startup-project C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj --project-dir C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\ --language C# --working-dir C:\Users\mrrar\Development\MarketingIncentive --root-namespace MarketingIncentive.Data
Using assembly 'MarketingIncentive.Data'.
Using startup assembly 'MarketingIncentive.API'.
Using application base 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0'.
Using working directory 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API'.
Using root namespace 'MarketingIncentive.Data'.
Using project directory 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\'.
Remaining arguments: .
Finding DbContext classes...
Finding IDesignTimeDbContextFactory implementations...
Finding application service provider in assembly 'MarketingIncentive.API'...
Finding Microsoft.Extensions.Hosting service provider...
Using environment 'Development'.
Using application service provider from Microsoft.Extensions.Hosting.
Found DbContext 'MarketingIncentiveDBContext'.
Finding DbContext classes in the project...
Using context 'MarketingIncentiveDBContext'.
Building bundle...
dotnet publish --output C:\Users\mrrar\AppData\Local\Temp\etc5av4u.vrh\publish
Microsoft (R) Build Engine version 17.0.0-preview-21378-03+d592862ed for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  Restored C:\Users\mrrar\AppData\Local\Temp\etc5av4u.vrh\bundle.csproj (in 319 ms).
  2 of 3 projects are up-to-date for restore.
  You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
  You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
  MarketingIncentive.Data -> C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 1 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 2 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 3 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 4 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 5 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 6 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 7 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 8 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 9 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): warning MSB3026: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Beginning retry 10 in 1000ms. The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): error MSB3027: Could not copy "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". Exceeded retry count of 10. Failed.  [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
C:\Program Files\dotnet\sdk\6.0.100-preview.7.21379.14\Microsoft.Common.CurrentVersion.targets(4685,5): error MSB3021: Unable to copy file "C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.Data\bin\Debug\net6.0\MarketingIncentive.Data.dll" to "bin\Debug\net6.0\MarketingIncentive.Data.dll". The process cannot access the file 'C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\bin\Debug\net6.0\MarketingIncentive.Data.dll' because it is being used by another process. [C:\Users\mrrar\Development\MarketingIncentive\MarketingIncentive.API\MarketingIncentive.API.csproj]
Microsoft.EntityFrameworkCore.Tools.CommandException: Build failed. Use --verbose to see errors.
   at Microsoft.EntityFrameworkCore.Tools.Commands.MigrationsBundleCommand.Execute(String[] args) in ef.dll:token 0x60001a9+0x23b
   at Microsoft.EntityFrameworkCore.Tools.Commands.CommandBase.<>c__DisplayClass0_0.<Configure>b__0(String[] args) in ef.dll:token 0x6000205+0x3b
   at Microsoft.DotNet.Cli.CommandLine.CommandLineApplication.Execute(String[] args) in ef.dll:token 0x6000053+0x100
   at Microsoft.EntityFrameworkCore.Tools.Program.Main(String[] args) in ef.dll:token 0x60000cf+0x2e
Build failed. Use --verbose to see errors.

[ivanmonteiro]

I gave up, so for me, this is a dead feature. A shame.

I manged to get it working after a couple of hours using the workaroud dotnet ef migrations bundle --configuration Bundle but it is not documented and it seems to not work for everybody.

My sistem configuration is: Windows 10, Dotnet sdk 6.0.2. and git bash as terminal.

BTW, have you tried using --configuration Bundle option?

[ivanmonteiro]

I feel that this issue is a show-stopper and not given the proper attention. This makes developers unable to create the bundle, and many will give will up using it completely. Is there any deadline to fix this?