l 1 mors: add umts config

lass/1systems/mors.nix

@@ -29,6 +29,7 @@
     ../2configs/cbase.nix
     ../2configs/mail.nix
     ../2configs/krebs-pass.nix
+    ../2configs/umts.nix
     #../2configs/buildbot-standalone.nix
     {
       #risk of rain port

lass/2configs/umts.nix

@@ -0,0 +1,61 @@
+{ config, lib, pkgs, ... }:
+
+with config.krebs.lib;
+
+let
+  nixpkgs-1509 = import (pkgs.fetchFromGitHub {
+    owner = "NixOS"; repo = "nixpkgs-channels";
+    rev = "91371c2bb6e20fc0df7a812332d99c38b21a2bda";
+    sha256 = "1as1i0j9d2n3iap9b471y4x01561r2s3vmjc5281qinirlr4al73";
+  }) {};
+
+  wvdial = nixpkgs-1509.wvdial; # https://github.com/NixOS/nixpkgs/issues/16113
+
+  modem-device = "/dev/serial/by-id/usb-Lenovo_F5521gw_38214921FBBBC7B0-if09";
+
+  # TODO: currently it is only netzclub
+  umts-bin = pkgs.writeScriptBin "umts" ''
+    #!/bin/sh
+    set -euf
+    systemctl stop wpa_supplicant
+    systemctl start umts
+    trap "systemctl stop umts;trap - INT TERM EXIT;exit" INT TERM EXIT
+    echo nameserver 8.8.8.8 | tee -a /etc/resolv.conf
+    journalctl -xfu umts
+    systemctl start wpa_supplicant
+  '';
+
+  wvdial-defaults = ''
+    Modem = ${modem-device}
+    Init1 = AT+CFUN=1
+    Init2 = AT+CGDCONT=1,"IP","pinternet.interkom.de","",0,0
+    Stupid mode = 1
+    phone= *99#
+    Username = netzclub
+    Password = netzclub
+  '';
+
+
+  out = {
+    environment.shellAliases = {
+      umts = "sudo ${umts-bin}/bin/umts";
+    };
+
+    security.sudo.extraConfig = ''
+      lass ALL= (root) NOPASSWD: ${umts-bin}/bin/umts
+    '';
+
+    environment.wvdial.dialerDefaults = wvdial-defaults;
+
+    systemd.services.umts = {
+      description = "UMTS wvdial Service";
+      serviceConfig = {
+        Type = "simple";
+        Restart = "always";
+        RestartSec = "10s";
+        ExecStart = "${wvdial}/bin/wvdial -n";
+      };
+    };
+  };
+in out
+