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This is mainly useful for specifying mounts that depend on other units. For example sshfs or davfs need network (and possibly nameservices). While systemd makes a distinction between local and remote filesystems, this only works for in-kernel filesystems such as nfs and cifs. fuse-based filesystems (such as sshfs and davs) are classified as local, so they fail without networking. By explicitly declaring these mounts as full systemd units (as opposed to having systemd generate them automatically from /etc/fstab), dependencies can be specified as on every other unit. In the future, we can probably port NixOS' filesystems handling to use these native systemd.mount units and skip /etc/fstab altogether, but this probably requires additional changes, such as starting systemd even earlier during boot (stage 1).
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.