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nixpkgs/nixos/tests/predictable-interface-names.nix

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Nix

{ system ? builtins.currentSystem }:
let
inherit (import ../lib/testing.nix { inherit system; }) makeTest pkgs;
in pkgs.lib.listToAttrs (pkgs.lib.crossLists (predictable: withNetworkd: {
name = pkgs.lib.optionalString (!predictable) "un" + "predictable"
+ pkgs.lib.optionalString withNetworkd "Networkd";
value = makeTest {
name = "${if predictable then "" else "un"}predictableInterfaceNames${if withNetworkd then "-with-networkd" else ""}";
meta = {};
machine = { lib, ... }: {
networking.usePredictableInterfaceNames = lib.mkForce predictable;
networking.useNetworkd = withNetworkd;
networking.dhcpcd.enable = !withNetworkd;
};
testScript = ''
print $machine->succeed("ip link");
$machine->succeed("ip link show ${if predictable then "ens3" else "eth0"}");
$machine->fail("ip link show ${if predictable then "eth0" else "ens3"}");
'';
};
}) [[true false] [true false]])