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{
  config,
  lib,
  pkgs,
  ...
}:
with lib;
let
  cfg = config.nixfiles.modules.openssh;
in
{
  options.nixfiles.modules.openssh.client.enable = mkEnableOption "OpenSSH client";

  config = mkIf cfg.client.enable {
    hm = {
      home.packages = with pkgs; [
        mosh
        sshfs
        sshpass
      ];

      programs.ssh = {
        enable = true;

        hashKnownHosts = true;

        controlMaster = "auto";
        controlPersist = "24H";

        serverAliveCountMax = 30;
        serverAliveInterval = 60;

        matchBlocks =
          let
            mkBlock =
              name:
              {
                hostname ? name,
                port ? 22022, # NOTE This is not the default OpenSSH port.
                user ? my.username,
                identityFile ? "${config.my.home}/.ssh/${my.username}_${my.ssh.type}",
                extraAttrs ? { },
              }:
              nameValuePair name (
                {
                  inherit
                    hostname
                    port
                    user
                    identityFile
                    ;
                }
                // extraAttrs
              );

            internalServers = mapAttrs' mkBlock (
              mapAttrs (name: _: { hostname = "${name}.${my.domain.shire}"; }) (
                filterAttrs (_: attr: hasAttr "wireguard" attr && attr.isHeadless) my.configurations
              )
            );
          in
          internalServers
          // (mapAttrs' mkBlock {
            gitolite = {
              user = "git";
              hostname = "git.${my.domain.shire}";
            };
          });
      };
    };
  };
}

Consider giving Nix/NixOS a try! <3