harcode paths for kpppoed, add port num in config

bordervm-configuration.nix

@@ -9,13 +9,14 @@
   systemd.services.pppoe =
     let conf = pkgs.writeText "kpppoed.toml"
     ''
-      interface_name = "eth0"
+      interface_name = "eth1"
       services = [ "myservice" ]
-      lns_ipaddr = "90.155.53.19"
+      lns_ipaddr = "90.155.53.19:1701"
       ac_name = "kpppoed-1.0"
     '';
     in  {
       wantedBy = [ "multi-user.target" ];
+      after = [ "network-online.target" ];
       serviceConfig = {
         ExecStart = "${pkgs.go-l2tp}/bin/kpppoed -config ${conf}";
       };

overlay.nix

@@ -26,6 +26,7 @@ final: prev: {
 
   mips-vm = final.callPackage ./pkgs/mips-vm {};
   pppoe = final.callPackage ./pkgs/pppoe {};
+  pppBuild = prev.ppp;
   ppp =
     (prev.ppp.override {
       libpcap = null;

pkgs/go-l2tp/default.nix

@@ -1,6 +1,7 @@
 {
   buildGoModule
 , fetchFromGitHub
+, pppBuild
 }:
 
 buildGoModule rec {
@@ -13,6 +14,13 @@ buildGoModule rec {
     rev = "570d763";
     hash= "sha256-R8ImKPkPBC+FvzKOBEZ3VxQ12dEjtfRa7AH94xMsAGA=";
   };
+
+  patchPhase = ''
+    sed -i.bak -e 's:/usr/sbin/pppd:${pppBuild}/bin/pppd:' cmd/kl2tpd/pppd.go
+    sed -i.bak -e 's:/usr/sbin/kl2tpd:${placeholder "out"}/bin/kl2tpd:' cmd/kpppoed/l2tpd_kl2tpd.go
+    grep bin/kl2tp cmd/kpppoed/l2tpd_kl2tpd.go
+  '';
+
   doCheck = false;
   vendorHash = "sha256-hOkhJhToN/VJwjQmnQJSPGz26/YDR2Ch+1yeW51OF+U=";