feat: enable dhcp

base.nix

@@ -22,6 +22,10 @@ with lib;
       type = types.bool;
       description = "enable nix-daemon and a writeable store";
     };
+    not-os.dhcp = mkOption {
+      type = types.bool;
+      description = "enable dhcp initial discovery on startup";
+    };
     not-os.rngd = mkOption {
       type = types.bool;
       description = "enable rngd";
@@ -104,6 +108,7 @@ with lib;
       passwd.text = ''
         root:x:0:0:System administrator:/root:/run/current-system/sw/bin/bash
         sshd:x:498:65534:SSH privilege separation user:/var/empty:/run/current-system/sw/bin/nologin
+        dhcpcd:x:499:65534:DHCP Client privilege separation user:/var/empty:/run/current-system/sw/bin/nologin
         toxvpn:x:1010:65534::/var/lib/toxvpn:/run/current-system/sw/bin/nologin
         nixbld1:x:30001:30000:Nix build user 1:/var/empty:/run/current-system/sw/bin/nologin
         nixbld2:x:30002:30000:Nix build user 2:/var/empty:/run/current-system/sw/bin/nologin

runit.nix

@@ -42,9 +42,16 @@ in
         ip route add 10.0.2.0/24 dev eth0
         ip  route add default via 10.0.2.2 dev eth0
         ''}
+
         mkdir /bin/
         ln -s ${pkgs.runtimeShell} /bin/sh
 
+        ${lib.optionalString config.not-os.dhcp ''
+          mkdir -p /var/db/dhcpcd /var/run/dhcpcd
+          touch /etc/dhcpcd.conf
+          ${pkgs.dhcpcd}/sbin/dhcpcd --oneshot
+        ''}
+
         ${lib.optionalString (config.networking.timeServers != []) ''
           ${pkgs.ntp}/bin/ntpdate ${toString config.networking.timeServers}
         ''}
@@ -56,7 +63,6 @@ in
 
         touch /etc/runit/stopit
         chmod 0 /etc/runit/stopit
-        ${if true then "" else "${pkgs.dhcpcd}/sbin/dhcpcd"}
       '';
       "runit/2".source = pkgs.writeScript "2" ''
         #!${pkgs.runtimeShell}
@@ -79,6 +85,13 @@ in
         nix-daemon
       '';
     }
+    (lib.mkIf config.not-os.dhcp {
+      "service/dhcp/run".source = pkgs.writeScript "dhcp_run" ''
+        #!${pkgs.runtimeShell}
+        echo Start dhcp client
+        ${pkgs.dhcpcd}/sbin/dhcpcd --background
+      '';
+    })
     (lib.mkIf config.not-os.rngd {
       "service/rngd/run".source = pkgs.writeScript "rngd" ''
         #!${pkgs.runtimeShell}