From 8f16f66b27c6abcfaa04244f9e715376035dcfcb Mon Sep 17 00:00:00 2001
From: datafoo <34766150+datafoo@users.noreply.github.com>
Date: Fri, 29 May 2020 12:20:06 +0200
Subject: [PATCH] nixos/networking: check interface state files exist before
 acting on them

Fix #89158
---
 .../tasks/network-interfaces-scripted.nix     | 24 +++++++++++--------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/nixos/modules/tasks/network-interfaces-scripted.nix b/nixos/modules/tasks/network-interfaces-scripted.nix
index d895c58bab0..2e87197176b 100644
--- a/nixos/modules/tasks/network-interfaces-scripted.nix
+++ b/nixos/modules/tasks/network-interfaces-scripted.nix
@@ -232,18 +232,22 @@ let
               '';
             preStop = ''
               state="/run/nixos/network/routes/${i.name}"
-              while read cidr; do
-                echo -n "deleting route $cidr... "
-                ip route del "$cidr" dev "${i.name}" >/dev/null 2>&1 && echo "done" || echo "failed"
-              done < "$state"
-              rm -f "$state"
+              if [ -e "$state" ]; then
+                while read cidr; do
+                  echo -n "deleting route $cidr... "
+                  ip route del "$cidr" dev "${i.name}" >/dev/null 2>&1 && echo "done" || echo "failed"
+                done < "$state"
+                rm -f "$state"
+              fi
 
               state="/run/nixos/network/addresses/${i.name}"
-              while read cidr; do
-                echo -n "deleting address $cidr... "
-                ip addr del "$cidr" dev "${i.name}" >/dev/null 2>&1 && echo "done" || echo "failed"
-              done < "$state"
-              rm -f "$state"
+              if [ -e "$state" ]; then
+                while read cidr; do
+                  echo -n "deleting address $cidr... "
+                  ip addr del "$cidr" dev "${i.name}" >/dev/null 2>&1 && echo "done" || echo "failed"
+                done < "$state"
+                rm -f "$state"
+              fi
             '';
           };