mergerfs is a union filesystem for FUSE. It allows to join multiple source directories, declare priority mappings for file operations, to provide a joined view to the underlying files. It's similar to mhddfs, unionfs, and aufs; but allows for accessing standard and extended attributes.
ReleaseNotes
minor feature: 7edd3c6 config: invalid error check when parsing config file.1b26f49 general cleanup, slight memory reduction.C3fffef msp policies: used wrong path to check existence.7e583e3 use relative option for rsync.
