{ lib, values, ... }:
let
  # See microbel:/etc/exports
  letters = [ "a" "b" "c" "d"  "h" "i" "j" "k" "l" "m" "z" ];
in
{
  systemd.targets."pvv-homedirs" = {
    description = "PVV Homedir Partitions";
  };

  systemd.mounts =
    (map (l: {
      description = "PVV Homedir Partition ${l}";

      before = [ "remote-fs.target" ];
      wantedBy = [ "multi-user.target" ];
      requiredBy = [ "pvv-homedirs.target" ];

      type = "nfs";
      what = "homepvv${l}.pvv.ntnu.no:/export/home/pvv/${l}";
      where = "/run/pvv-home-mounts/${l}";

      options = lib.concatStringsSep "," [
        "nfsvers=3"

        # NOTE: this is a bit unfortunate. The address above seems to resolve to IPv6 sometimes,
        #       and it doesn't seem possible to specify proto=tcp,tcp6, meaning we have to tell
        #       NFS which exact address to use here, despite it being specified in the `what` attr :\
        "proto=tcp"
        "addr=${values.hosts.microbel.ipv4}"
        "mountproto=tcp"
        "mounthost=${values.hosts.microbel.ipv4}"
        "port=2049"

        # NOTE: this is yet more unfortunate. When enabling locking, it will sometimes complain about connection failed.
        #       dmesg(1) reveals that it has something to do with registering the lockdv1 RPC service (errno: 111), not
        #       quite sure how to fix it. Living life on dangerous mode for now.
        "nolock"

        # Don't wait on every read/write
        "async"

        # Always keep mounted
        "noauto"

        # We don't want to update access time constantly
        "noatime"

        # No SUID/SGID, no special devices
        "nosuid"
        "nodev"

        # TODO: are there cgi scripts that modify stuff in peoples homedirs?
        # "ro"
        "rw"

        # TODO: can we enable this and still run cgi stuff?
        # "noexec"
      ];
    }) letters)
    ++ [{
      description = "PVV Merged Homedir OverlayFS";

      after = [ "remote-fs.target" ];
      wantedBy = [ "multi-user.target" ];
      requiredBy = [ "pvv-homedirs.target" ];

      type = "overlay";
      what = "overlay";
      where = "/run/pvv-home-mounts-merged";

      options = lib.concatStringsSep "," [
        "lowerdir=${lib.concatMapStringsSep ":" (l: "/run/pvv-home-mounts/${l}") letters}"
      ];
    }];
}