add pppoe

pkgs/liminix-tools/default.nix

@@ -77,6 +77,7 @@ in {
       name = "${interface.device}.odhcp";
       run = "odhcpcd ${interface.device}";
     };
+    pppoe = callPackage ./networking/pppoe.nix {};
   };
   services = {
     inherit longrun oneshot bundle target;

pkgs/liminix-tools/networking/pppoe.nix

@@ -0,0 +1,48 @@
+{
+  liminix
+, lib
+, busybox
+, ppp
+, pppoe
+, writeShellScript
+} :
+let
+  inherit (liminix.services) longrun;
+  ip-up = writeShellScript "ip-up" ''
+action=$1
+env > /run/udhcp.values
+
+set_address() {
+    ip address replace $ip/$mask dev $interface
+    mkdir -p data/outputs
+    for i in lease mask ip router siaddr dns serverid subnet opt53 interface ; do
+        echo ''${!i} > data/outputs/$i
+    done
+}
+case $action in
+  deconfig)
+    ip address flush $interface
+    ip link set up dev $interface
+    ;;
+  bound)
+    # this doesn't actually replace, it adds a new address.
+    set_address
+    ;;
+  renew)
+    set_address
+    ;;
+  nak)
+    echo "received NAK on $interface"
+    ;;
+esac
+'';
+
+in
+interface: {
+  synchronous ? false
+, ppp-options ? []
+, ...
+} @ args: longrun {
+  name = "${interface.device}.ppppoe";
+  run = "${ppp}/bin/pppd pty '${pppoe}/bin/pppoe -I ${interface.device}' ${lib.concatStringsSep " " ppp-options}" ;
+}