nixos-config/home-manager/modules/rclone/default.nix

{
  pkgs,
  config,
  lib,
  ...
}:
with lib;
let
  cfg = config.eboskma.programs.rclone;

  rcloneConnectionString =
    mount:
    let
      type = mount.remoteConfig.type;
      config = builtins.removeAttrs mount.remoteConfig [ "type" ];
      connectionStringOptions = mapAttrsToList (key: value: "${key}=${builtins.toJSON value}") config;
    in
    ":${type},${builtins.concatStringsSep "," connectionStringOptions}:${mount.remote}";

  rcloneRemote =
    with types;
    attrsOf (oneOf [
      str
      int
      bool
    ]);

  rcloneMount =
    with types;
    submodule {
      options = {
        remoteConfig = mkOption {
          description = "Configuration for the remote to use";
          type = rcloneRemote;
        };
        remote = mkOption {
          description = "Remote path";
          type = str;
        };
        local = mkOption {
          description = "Local mountpoint";
          type = path;
        };
      };
    };
in
{
  options.eboskma.programs.rclone = {
    enable = mkEnableOption "rclone";

    mounts = mkOption {
      description = "Mount remotes on a local path";
      type = with types; listOf rcloneMount;
      default = [ ];
    };
  };

  config = mkIf cfg.enable {
    home.packages = [ pkgs.rclone ];

    systemd.user.services = builtins.listToAttrs (
      builtins.map (
        mount:
        let
          localPath = toString mount.local;
          unitName = builtins.replaceStrings [ "/" ] [ "-" ] (
            builtins.substring 1 (builtins.stringLength localPath) localPath
          );
        in
        {
          name = "rclone-${unitName}";
          value = {
            Unit = {
              Description = "rclone mount ${unitName}";
              After = [ "network.target" ];
              AssertPathIsDirectory = toString mount.local;
            };

            Service = {
              Environment = [ "PATH=/run/wrappers/bin:$PATH" ];
              ExecStart = "${pkgs.rclone}/bin/rclone mount --vfs-cache-mode full --vfs-cache-poll-interval 5s --poll-interval 5s --dir-cache-time 10s --umask 022 --allow-other ${rcloneConnectionString mount} ${mount.local}";
              ExecStop = "/run/wrappers/bin/fusermount -zu ${mount.local}";
              Restart = "on-failure";
              RestartSec = 10;
            };

            Install = {
              WantedBy = [ "default.target" ];
            };
          };
        }
      ) cfg.mounts
    );
  };
}