From 06d28e9b0847dbac195ec7a0a88b96c3e21e344c Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Sat, 15 Jun 2024 15:34:49 +0100
Subject: [PATCH] dhcpc handle case when env vars are missing

the notify-script should continue and signal readiness even if one or
more of the outputs it writes are mssing in the environment
---
 modules/network/dhcpc.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/network/dhcpc.nix b/modules/network/dhcpc.nix
index ed665b3..cd652b2 100644
--- a/modules/network/dhcpc.nix
+++ b/modules/network/dhcpc.nix
@@ -17,7 +17,7 @@ let
         ip address replace $ip/$mask dev $interface
         (in_outputs ${name}
          for i in lease mask ip router siaddr dns serverid subnet opt53 interface ; do
-            printenv $i > $i
+            (printenv $i || true) > $i
          done)
     }
     case $action in
@@ -40,7 +40,7 @@ let
   '';
 in longrun {
   inherit name;
-  run = "/bin/udhcpc -f -i $(output ${interface} ifname) -x hostname:$(cat /proc/sys/kernel/hostname) -s ${script}";
+  run = "exec /bin/udhcpc -f -i $(output ${interface} ifname) -x hostname:$(cat /proc/sys/kernel/hostname) -s ${script}";
   notification-fd = 10;
   dependencies = [ interface ];
 }