rename-exdev

If using path preservation and a rename fails with EXDEV:

1. Move file from /branch/a/b/c to /branch/.mergerfs_rename_exdev/a/b/c.
2. symlink the rename's newpath to the moved file.

The target value is determined by the value of rename-exdev.

• rename-exdev=passthrough: Return EXDEV as normal.
• rename-exdev=rel-symlink: A relative path from the newpath.
• rename-exdev=abs-symlink: An absolute value using the mergerfs mount point.
• Defaults to passthrough.

NOTE: It is possible that some applications check the file they rename. In those cases it is possible it will error or complain.

NOTE: The reason abs-symlink is not split into two like link-exdev is due to the complexities in managing absolute base symlinks when multiple oldpaths exist.