Show time

Ok no actually I meant Fix time but Show time sounds good so that's
officially the commit's name now.

hm/common.nix

@@ -229,6 +229,7 @@
       # toolbox
       imagemagick
       numbat
+      bc
 
       # hardware
       pciutils

hm/desktop/default.nix

@@ -185,6 +185,7 @@
         xclip
         keynav
         xorg.xinit
+        scrot
       ];
       sessionVariables = {
         # XAUTHORITY = "${config.xdg.configHome}/Xauthority"; # Disabled as this causes lock-ups with DMs

os/common.nix

@@ -80,12 +80,6 @@
     # Enable the OpenSSH daemon
     openssh.enable = true;
 
-    # Time sychronisation
-    chrony = {
-      enable = true;
-      servers = map (n: "${toString n}.europe.pool.ntp.org") (lib.lists.range 0 3);
-    };
-
     # Prevent power button from shutting down the computer.
     # On Pinebook it's too easy to hit,
     # on others I sometimes turn it off when unsuspending.

os/default.nix

@@ -6,8 +6,8 @@
     ./battery.nix
     ./boot
     ./ccc
-    ./cuda
     ./common.nix
+    ./cuda
     ./desktop
     ./dev
     disko.nixosModules.disko
@@ -18,6 +18,7 @@
     ./remote-builds
     ./style
     ./syncthing
+    ./time
     ./wireless
   ];
 }

os/time/default.nix

@@ -0,0 +1,47 @@
+{
+  lib,
+  config,
+  ...
+}:
+{
+  config = {
+    # Apparently better than reference implementation
+    services.chrony.enable = true;
+
+    networking = {
+      # Using community provided service
+      timeServers = map (n: "${toString n}.europe.pool.ntp.org") (lib.lists.range 0 3);
+
+      # Only try to sync time when we have internet connection
+      dhcpcd.runHook = ''
+        if $if_up
+        then
+            /run/wrappers/bin/sudo ${config.services.chrony.package}/bin/chronyc online
+        elif $if_down
+        then
+            /run/wrappers/bin/sudo ${config.services.chrony.package}/bin/chronyc offline
+        fi
+      '';
+    };
+
+    # Allow dhcpcd to control chrony
+    security.sudo.extraRules = [
+      {
+        users = [ "dhcpcd" ];
+        commands =
+          builtins.map
+            (arg: {
+              command = "${config.services.chrony.package}/bin/chronyc ${arg}";
+              options = [ "NOPASSWD" ];
+
+            })
+            [
+              "online"
+              "offline"
+            ];
+      }
+    ];
+    systemd.services.dhcpcd.serviceConfig.NoNewPrivileges = false;
+
+  };
+}

os/wireless/default.nix

@@ -54,15 +54,6 @@ in
   ];
   # wireless support via wpa_supplicant
   networking = {
-    # Tell the time synchronisation service when we got/lost the connection
-    dhcpcd.runHook = ''
-      if $if_up; then
-          ${config.services.chrony.package}/bin/chronyc online
-      elif $if_down; then
-          ${config.services.chrony.package}/bin/chronyc offline
-      fi
-    '';
-
     wireless = {
       enable = true;
       extraConfig = ''