deduplicated files on ReFS are not readable inside Windows containers

[doctorpangloss]

Please fill out all the sections below for bug issues, otherwise it'll be closed as it won't be actionable for us to address.

Describe the bug
deduplicated files on ReFS are not readable inside Windows containers

To Reproduce

1. create a refs volume
2. deduplicate a file on it
3. mount the directory containing the deduplicated reparse point / symbolic link file into a docker engine container
4. try to read the file from inside the container
5. observe it fails, for example:

(this is a deduplicated file)

PS C:\workspace> Get-Content -Path "Assets/3rd Party/Photon/PhotonChat/Code/ChatClient.cs"
Get-Content : The file or directory is corrupted and unreadable.
At line:1 char:1
+ Get-Content -Path "Assets/3rd Party/Photon/PhotonChat/Code/ChatClient ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ReadError: (C:\workspace\As...e\ChatClient.cs:String) [Get-Content], IOException
    + FullyQualifiedErrorId : GetContentReaderIOError,Microsoft.PowerShell.Commands.GetContentCommand

Expected behavior
deduplicated files should be supported

Configuration:

• Edition: Windows Server 2022
• Base Image being used: dotnetfx 6
• Container engine: docker
• Container Engine version: 27.0.3

[github-actions]

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[ntrappe-msft]

Hi, thanks for reaching out. We're discussing deduplication support and expected behavior with another team. In the meantime, can you explain more about what your scenario is and why you're trying to use deduplicated files in Windows Containers?

[doctorpangloss]

Hi, thanks for reaching out. We're discussing deduplication support and expected behavior with another team. In the meantime, can you explain more about what your scenario is and why you're trying to use deduplicated files in Windows Containers?

I am mounting volumes from a "Dev Drive" with deduplication enabled, such as a git repository, and I would expect an application inside the container to be able to read the files in the repository.

I am mounting large binaries like images to a container which are deduplicated.

I am mounting a build cache for gradle, dotnet, etc.

[microsoft-github-policy-service]

This issue has been open for 30 days with no updates.
no assignees, please provide an update or close this issue.

[microsoft-github-policy-service]

This issue has been open for 30 days with no updates.
no assignees, please provide an update or close this issue.