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...not sure I follow what you have in mind here. Can you give a little more detail? > How can you be sure the file actually exists on the FS? That's what the VFS should be all about, hiding this abstraction... if you *are* sure it exists, or want to make sure, you need to pull the appropriate realFS from the VFS Overlay (most tools have an overlay of a memoryFS above the realFS). That makes sense, for LLDB's use case we would be happy having just a real or redirecting filesystem (with fall through). > What I am not sure about is extending the general interface in a way that it caters...

I'd like to get some more perspectives on the role of the VirtualFileSystem abstraction in llvm/Support. (The VFS layer has recently moved from Clang to LLVM, so crossposting to both lists) https://reviews.llvm.org/D54277 proposed adding a function to VirtualFileSystem to get the underlying "real file" path from a VFS path. LLDB is starting to use VFS for some filesystem