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create unique temporary directories to prevent permission issues #7173

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ErikApption
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@ErikApption ErikApption commented Jun 9, 2024

Fixes #7172

This is a tentative fix for #7172 where ml.net fails when multiple users are using same directory. This fix checks if there is already a ml_dotnet if so, it will increase the number until the path is available.

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@michaelgsharp
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so Path.GetRandomFileName() should make sure we are getting unique temp directories. What problems are you seeing in regards to this?

@ErikApption
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ErikApption commented Jun 26, 2024

so Path.GetRandomFileName() should make sure we are getting unique temp directories. What problems are you seeing in regards to this?

Current code has this

string path = Path.Combine(Path.GetFullPath(tempPath), "ml_dotnet", Path.GetRandomFileName());

Issue is the directory name ml_dotnet, not the temp file name. The Path.Combine will create a subdirectory and a random file name inside that directory. The directory name is not unique. When one user processes creates /tmp/ml_dotnet/ for ML.net and a second user runs the same ML.net application at the same time, the second user cannot create /tmp/ml_dotnet/<temp file name> because permissions on /tmp/ml_dotnet/ are restricted to user 1. User 2 doesn't have write permissions (at least on default ubuntu but would be surprised this is different on other distros).

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Directory permission exception with multiple concurrent users on linux
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