set hostname before dhcp client runs

default.nix

@@ -22,6 +22,7 @@ let
       { _module.args = { inherit pkgs; lib = pkgs.lib; }; }
       ./modules/hardware.nix
       ./modules/base.nix
+      ./modules/hostname.nix
       device.module
       liminix-config
       ./modules/s6

extneder.nix

@@ -38,6 +38,8 @@ in rec {
     ./modules/flashable.nix
   ];
 
+  hostname = "extneder";
+
   kernel = {
     config = {
 
@@ -90,7 +92,10 @@ in rec {
     type = "bridge";
     device = "int";
   };
-  services.dhcpc = (udhcpc services.int {}) // {device = "int";};
+
+  services.dhcpc = (udhcpc services.int {
+    dependencies = [ config.services.hostname ];
+  }) // { device = "int"; };
 
   services.bridge = let
     primary = services.int;
@@ -154,7 +159,7 @@ in rec {
     name = "default";
     contents =
       let links = config.hardware.networkInterfaces;
-      in with services; [
+      in with config.services; [
         links.lo links.eth links.wlan
         int
         bridge

modules/hostname.nix

@@ -0,0 +1,19 @@
+{ lib, pkgs, config, ...}:
+let
+  inherit (lib) mkOption types;
+  inherit (pkgs.liminix.services) oneshot;
+in {
+  options = {
+    hostname = mkOption {
+      default = "liminix";
+      type = types.nonEmptyStr;
+    };
+  };
+  config = {
+    services.hostname = oneshot {
+      name = "hostname";
+      up = "echo ${config.hostname} > /proc/sys/kernel/hostname";
+      down = "true";
+    };
+  };
+}

pkgs/liminix-tools/networking/udhcpc.nix

@@ -7,7 +7,7 @@
 let
   inherit (liminix.services) longrun;
 in
-interface: { ... } @ args:
+interface: { dependencies ? [] } @ args:
 let
   name = "${interface.device}.udhcp";
   script = writeAshScript "udhcp-notify"  {
@@ -43,9 +43,9 @@ let
   '';
 in longrun {
   inherit name;
-  run = "${busybox}/bin/udhcpc -f -i ${interface.device} -s ${script}";
+  run = "${busybox}/bin/udhcpc -f -i ${interface.device} -x hostname:$(cat /proc/sys/kernel/hostname) -s ${script}";
   notification-fd = 10;
-  dependencies = [ interface ];
+  dependencies = [ interface ] ++ dependencies;
 }
 
 # lease=86400