133 lines
4.5 KiB
Nix
133 lines
4.5 KiB
Nix
{ config, lib, pkgs, utils, ...}:
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with utils.systemdUtils.unitOptions;
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with utils.systemdUtils.lib;
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with lib;
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let
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cfg = config.systemd.nspawn;
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checkExec = checkUnitConfig "Exec" [
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(assertOnlyFields [
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"Boot" "ProcessTwo" "Parameters" "Environment" "User" "WorkingDirectory"
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"PivotRoot" "Capability" "DropCapability" "NoNewPrivileges" "KillSignal"
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"Personality" "MachineId" "PrivateUsers" "NotifyReady" "SystemCallFilter"
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"LimitCPU" "LimitFSIZE" "LimitDATA" "LimitSTACK" "LimitCORE" "LimitRSS"
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"LimitNOFILE" "LimitAS" "LimitNPROC" "LimitMEMLOCK" "LimitLOCKS"
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"LimitSIGPENDING" "LimitMSGQUEUE" "LimitNICE" "LimitRTPRIO" "LimitRTTIME"
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"OOMScoreAdjust" "CPUAffinity" "Hostname" "ResolvConf" "Timezone"
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"LinkJournal"
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])
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(assertValueOneOf "Boot" boolValues)
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(assertValueOneOf "ProcessTwo" boolValues)
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(assertValueOneOf "NotifyReady" boolValues)
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];
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checkFiles = checkUnitConfig "Files" [
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(assertOnlyFields [
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"ReadOnly" "Volatile" "Bind" "BindReadOnly" "TemporaryFileSystem"
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"Overlay" "OverlayReadOnly" "PrivateUsersChown"
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])
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(assertValueOneOf "ReadOnly" boolValues)
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(assertValueOneOf "Volatile" (boolValues ++ [ "state" ]))
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(assertValueOneOf "PrivateUsersChown" boolValues)
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];
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checkNetwork = checkUnitConfig "Network" [
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(assertOnlyFields [
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"Private" "VirtualEthernet" "VirtualEthernetExtra" "Interface" "MACVLAN"
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"IPVLAN" "Bridge" "Zone" "Port"
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])
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(assertValueOneOf "Private" boolValues)
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(assertValueOneOf "VirtualEthernet" boolValues)
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];
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instanceOptions = {
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options = sharedOptions // {
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execConfig = mkOption {
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default = {};
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example = { Parameters = "/bin/sh"; };
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type = types.addCheck (types.attrsOf unitOption) checkExec;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Exec]</literal> section of this unit. See
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<citerefentry><refentrytitle>systemd.nspawn</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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filesConfig = mkOption {
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default = {};
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example = { Bind = [ "/home/alice" ]; };
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type = types.addCheck (types.attrsOf unitOption) checkFiles;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Files]</literal> section of this unit. See
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<citerefentry><refentrytitle>systemd.nspawn</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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networkConfig = mkOption {
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default = {};
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example = { Private = false; };
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type = types.addCheck (types.attrsOf unitOption) checkNetwork;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Network]</literal> section of this unit. See
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<citerefentry><refentrytitle>systemd.nspawn</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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};
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instanceToUnit = name: def:
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let base = {
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text = ''
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[Exec]
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${attrsToSection def.execConfig}
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[Files]
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${attrsToSection def.filesConfig}
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[Network]
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${attrsToSection def.networkConfig}
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'';
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} // def;
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in base // { unit = makeUnit name base; };
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in {
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options = {
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systemd.nspawn = mkOption {
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default = {};
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type = with types; attrsOf (submodule instanceOptions);
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description = "Definition of systemd-nspawn configurations.";
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};
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};
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config =
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let
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units = mapAttrs' (n: v: let nspawnFile = "${n}.nspawn"; in nameValuePair nspawnFile (instanceToUnit nspawnFile v)) cfg;
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in
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mkMerge [
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(mkIf (cfg != {}) {
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environment.etc."systemd/nspawn".source = mkIf (cfg != {}) (generateUnits' false "nspawn" units [] []);
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})
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{
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systemd.targets.multi-user.wants = [ "machines.target" ];
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# Workaround for https://github.com/NixOS/nixpkgs/pull/67232#issuecomment-531315437 and https://github.com/systemd/systemd/issues/13622
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# Once systemd fixes this upstream, we can re-enable -U
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systemd.services."systemd-nspawn@".serviceConfig.ExecStart = [
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"" # deliberately empty. signals systemd to override the ExecStart
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# Only difference between upstream is that we do not pass the -U flag
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"${config.systemd.package}/bin/systemd-nspawn --quiet --keep-unit --boot --link-journal=try-guest --network-veth --settings=override --machine=%i"
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];
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}
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];
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}
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