nixos/stage-1: fix predictable interfaces names

This makes predictable interfaces names available as soon as possible
with udev by adding the default network link units to initrd which are read
by udev. Also adds some udev rules that are needed but which would normally
loaded from the udev store path which is not included in the initrd.

1 files changed, 6 insertions, 0 deletions

diff --git a/nixos/tests/predictable-interface-names.nix b/nixos/tests/predictable-interface-names.nix
index 83883477a5cc..bab091d57acf 100644
--- a/nixos/tests/predictable-interface-names.nix
+++ b/nixos/tests/predictable-interface-names.nix
@@ -17,6 +17,12 @@ in pkgs.lib.listToAttrs (pkgs.lib.crossLists (predictable: withNetworkd: {
       networking.useNetworkd = withNetworkd;
       networking.dhcpcd.enable = !withNetworkd;
       networking.useDHCP = !withNetworkd;
+
+      # Check if predictable interface names are working in stage-1
+      boot.initrd.postDeviceCommands = ''
+        ip link
+        ip link show eth0 ${if predictable then "&&" else "||"} exit 1
+      '';
     };
 
     testScript = ''