From 77b7d29bf83b40defe90c02e346665dc4a69721f Mon Sep 17 00:00:00 2001
From: Jean-Baptiste Giraudeau <jean-baptiste.giraudeau@iohk.io>
Date: Thu, 11 Mar 2021 11:09:50 +0100
Subject: [PATCH] nixos/switch-to-configuration: don't try restart deleted
 sockets

---
 .../system/activation/switch-to-configuration.pl       | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/nixos/modules/system/activation/switch-to-configuration.pl b/nixos/modules/system/activation/switch-to-configuration.pl
index b82d69b3bb85..0445f39a8279 100644
--- a/nixos/modules/system/activation/switch-to-configuration.pl
+++ b/nixos/modules/system/activation/switch-to-configuration.pl
@@ -243,9 +243,13 @@ while (my ($unit, $state) = each %{$activePrev}) {
                             foreach my $socket (@sockets) {
                                 if (defined $activePrev->{$socket}) {
                                     $unitsToStop{$socket} = 1;
-                                    $unitsToStart{$socket} = 1;
-                                    recordUnit($startListFile, $socket);
-                                    $socketActivated = 1;
+                                    # Only restart sockets that actually
+                                    # exist in new configuration:
+                                    if (-e "$out/etc/systemd/system/$socket") {
+                                        $unitsToStart{$socket} = 1;
+                                        recordUnit($startListFile, $socket);
+                                        $socketActivated = 1;
+                                    }
                                 }
                             }
                         }