From fa7e682e87963ffc4560bf792ecd469efd13e132 Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Fri, 26 May 2023 18:36:44 +0100
Subject: [PATCH] dhcp6c readiness notification

---
 examples/rotuer.nix        | 1 +
 examples/udhcp6-script.fnl | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/examples/rotuer.nix b/examples/rotuer.nix
index b715da6..c19301c 100644
--- a/examples/rotuer.nix
+++ b/examples/rotuer.nix
@@ -244,6 +244,7 @@ in rec {
       '';
     in longrun {
       inherit name;
+      notification-fd = 10;
       run = ''
         ${pkgs.odhcp6c}/bin/odhcp6c -s ${script} -e -v -p /run/${name}.pid -P 48 $(output ${services.wan} ifname)
         )
diff --git a/examples/udhcp6-script.fnl b/examples/udhcp6-script.fnl
index f7d2b37..cd1c287 100644
--- a/examples/udhcp6-script.fnl
+++ b/examples/udhcp6-script.fnl
@@ -45,3 +45,11 @@
        ]]
   (each [_ n (ipairs wanted)]
     (write-value-from-env n)))
+
+(let [ready (match state
+              "started" false
+              "unbound" false
+              "stopped" false
+              _ true)]
+  (and ready
+       (with-open [fd (io.open "/proc/self/fd/10" :w)] (fd:write "\n"))))