nixos/networkd: respect systemd.network.links also with disabled systemd-networkd
This mirrors the behaviour of systemd - It's udev that parses `.link` files, not `systemd-networkd`. This was originally applied in36ef112a47
, but was reverted due to1115959a8d
causing evaluation errors on hydra.
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b00b66e262
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355c58e485
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@ -768,6 +768,14 @@ auth required pam_succeed_if.so uid >= 1000 quiet
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</itemizedlist>
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="opt-systemd.network.links">systemd.network.links</link> option is now respected
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even when <link linkend="opt-systemd.network.enable">systemd-networkd</command> is disabled.
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This mirrors the behaviour of systemd - It's udev that parses <literal>.link</literal> files,
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not <command>systemd-networkd</command>.
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</para>
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</listitem>
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</itemizedlist>
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</section>
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</section>
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@ -355,6 +355,14 @@ let
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};
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linkOptions = commonNetworkOptions // {
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# overwrite enable option from above
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enable = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Whether to enable this .link unit. It's handled by udev no matter if <command>systemd-networkd</command> is enabled or not
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'';
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};
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linkConfig = mkOption {
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default = {};
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@ -1045,7 +1053,14 @@ in
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};
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config = mkIf config.systemd.network.enable {
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config = mkMerge [
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# .link units are honored by udev, no matter if systemd-networkd is enabled or not.
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{
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systemd.network.units = mapAttrs' (n: v: nameValuePair "${n}.link" (linkToUnit n v)) cfg.links;
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environment.etc = unitFiles;
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}
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(mkIf config.systemd.network.enable {
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users.users.systemd-network.group = "systemd-network";
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@ -1053,12 +1068,9 @@ in
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"systemd-networkd.service" "systemd-networkd-wait-online.service"
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];
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systemd.network.units = mapAttrs' (n: v: nameValuePair "${n}.link" (linkToUnit n v)) cfg.links
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// mapAttrs' (n: v: nameValuePair "${n}.netdev" (netdevToUnit n v)) cfg.netdevs
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systemd.network.units = mapAttrs' (n: v: nameValuePair "${n}.netdev" (netdevToUnit n v)) cfg.netdevs
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// mapAttrs' (n: v: nameValuePair "${n}.network" (networkToUnit n v)) cfg.networks;
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environment.etc = unitFiles;
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systemd.services.systemd-networkd = {
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wantedBy = [ "multi-user.target" ];
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restartTriggers = attrNames unitFiles;
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@ -1084,5 +1096,6 @@ in
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};
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services.resolved.enable = mkDefault true;
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};
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})
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];
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}
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@ -655,6 +655,31 @@ let
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), "The IPv6 routing table has not been properly cleaned:\n{}".format(ipv6Residue)
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'';
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};
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# even with disabled networkd, systemd.network.links should work
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# (as it's handled by udev, not networkd)
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link = {
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name = "Link";
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nodes.client = { pkgs, ... }: {
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virtualisation.vlans = [ 1 ];
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networking = {
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useNetworkd = networkd;
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useDHCP = false;
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};
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systemd.network.links."50-foo" = {
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matchConfig = {
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Name = "foo";
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Driver = "dummy";
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};
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linkConfig.MTUBytes = "1442";
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};
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};
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testScript = ''
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print(client.succeed("ip l add name foo type dummy"))
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print(client.succeed("stat /etc/systemd/network/50-foo.link"))
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client.succeed("udevadm settle")
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assert "mtu 1442" in client.succeed("ip l show dummy0")
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'';
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};
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};
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in mapAttrs (const (attrs: makeTest (attrs // {
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