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

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{ system ? builtins.currentSystem,
config ? {},
pkgs ? import ../.. { inherit system config; }
}:
let
inherit (import ../lib/testing.nix { inherit system pkgs; }) makeTest;
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");
$machine->${if predictable then "fail" else "succeed"}("ip link show eth0 ");
'';
};
}) [[true false] [true false]])