It seems like the only two types of drivers are generic USB device drivers and HID input drivers, though.
There needs to be some OS-side FUSE-like kernel interface for userspace drivers like this to be able to actually mount them in the VFS.
There needs to be some OS-side FUSE-like kernel interface for userspace drivers like this to be able to actually mount them in the VFS.
They're more geared towards Dropbox-like synchronizing use cases. Some developers have made it work for SSHFS too, but even that's already a bit of a stretch; for more custom solutions it definitely falls short: https://developer.apple.com/forums/thread/681325
The only option currently seems to be to implement a network file server such as SMB (which is what Google Drive used to do before File Providers existed!) or NFS, for which there even is a FUSE bridge available: https://github.com/macos-fuse-t/fuse-t
I was hopeful that Ganesha NFS [1] would suffice as a bridge for the various FUSE filesystems I need to use with macOS, but alas, they have abandoned the FUSE interface and moved to FSAL/FSAL_VFS [2].
It would be really nice to have a clear path to building a copy of Ganesha NFS that supported a whole host of the great FUSE filesystems out there built to this API.
[1] https://github.com/nfs-ganesha/nfs-ganesha [2] https://github.com/nfs-ganesha/nfs-ganesha/issues/759
If you've ever had a suspicion about files on an SMB share going missing, occasionally, when there's been a Mac client using the share, this does indeed happen.