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-python.nix { inherit system pkgs; }) makeTest;
testCombinations = pkgs.lib.cartesianProductOfSets {
predictable = [true false];
withNetworkd = [true false];
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systemdStage1 = [true false];
};
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in pkgs.lib.listToAttrs (builtins.map ({ predictable, withNetworkd, systemdStage1 }: {
name = pkgs.lib.optionalString (!predictable) "un" + "predictable"
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+ pkgs.lib.optionalString withNetworkd "Networkd"
+ pkgs.lib.optionalString systemdStage1 "SystemdStage1";
value = makeTest {
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name = pkgs.lib.optionalString (!predictable) "un" + "predictableInterfaceNames"
+ pkgs.lib.optionalString withNetworkd "-with-networkd"
+ pkgs.lib.optionalString systemdStage1 "-systemd-stage-1";
meta = {};
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nodes.machine = { lib, ... }: let
script = ''
ip link
if ${lib.optionalString predictable "!"} ip link show eth0; then
echo Success
else
exit 1
fi
'';
in {
networking.usePredictableInterfaceNames = lib.mkForce predictable;
networking.useNetworkd = withNetworkd;
networking.dhcpcd.enable = !withNetworkd;
networking.useDHCP = !withNetworkd;
# Check if predictable interface names are working in stage-1
boot.initrd.postDeviceCommands = lib.mkIf (!systemdStage1) script;
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boot.initrd.systemd = lib.mkIf systemdStage1 {
enable = true;
initrdBin = [ pkgs.iproute2 ];
services.systemd-udev-settle.wantedBy = ["initrd.target"];
services.check-interfaces = {
requiredBy = ["initrd.target"];
after = ["systemd-udev-settle.service"];
serviceConfig.Type = "oneshot";
path = [ pkgs.iproute2 ];
inherit script;
};
};
};
testScript = ''
print(machine.succeed("ip link"))
machine.${if predictable then "fail" else "succeed"}("ip link show eth0")
'';
};
}) testCombinations)