The POSIX Overlay Filesystem https://inai.de/projects/posixovl
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README.rst

The POSIX Overlay Filesystem

posixovl provides a filesystem view that supports various POSIX operations while using an otherwise incapable lower filesystem. Filesystems of various degrees of POSIXness can be utilitzed. VFAT is a common denominator when it comes to cross-compatibility, though NTFS — its features are unused in Linux — would be another possibility. Native POSIX-capable filesystems can be used too, though that seems like an unusual application of posixovl.

  • Installation instructions
  • Runtime use is described in a manpage. Use man -l posixovl.1 to view (or man posixovl when using a distro-supplied pre-built package).