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nixos/switch-to-configuration: add sysinit-reactivation.target
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@ -37,7 +37,7 @@ of actions is always the same:
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- Forget about the failed state of units (`systemctl reset-failed`)
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- Reload systemd (`systemctl daemon-reload`)
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- Reload systemd user instances (`systemctl --user daemon-reload`)
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- Set up tmpfiles (`systemd-tmpfiles --create`)
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- Reactivate sysinit (`systemctl restart sysinit-reactivation.target`)
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- Reload units (`systemctl reload`)
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- Restart units (`systemctl restart`)
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- Start units (`systemctl start`)
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@ -889,9 +889,15 @@ while (my $f = <$list_active_users>) {
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close($list_active_users) || die("Unable to close the file handle to loginctl");
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# Set the new tmpfiles
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print STDERR "setting up tmpfiles\n";
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system("$new_systemd/bin/systemd-tmpfiles", "--create", "--remove", "--exclude-prefix=/dev") == 0 or $res = 3;
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# Restart sysinit-reactivation.target.
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# This target only exists to restart services ordered before sysinit.target. We
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# cannot use X-StopOnReconfiguration to restart sysinit.target because then ALL
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# services of the system would be restarted since all normal services have a
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# default dependency on sysinit.target. sysinit-reactivation.target ensures
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# that services ordered BEFORE sysinit.target get re-started in the correct
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# order. Ordering between these services is respected.
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print STDERR "restarting sysinit-reactivation.target\n";
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system("$new_systemd/bin/systemctl", "restart", "sysinit-reactivation.target") == 0 or $res = 4;
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# Before reloading we need to ensure that the units are still active. They may have been
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# deactivated because one of their requirements got stopped. If they are inactive
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@ -569,6 +569,13 @@ in
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unitConfig.X-StopOnReconfiguration = true;
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};
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# This target only exists so that services ordered before sysinit.target
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# are restarted in the correct order, notably BEFORE the other services,
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# when switching configurations.
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systemd.targets.sysinit-reactivation = {
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description = "Reactivate sysinit units";
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};
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systemd.units =
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mapAttrs' (n: v: nameValuePair "${n}.path" (pathToUnit n v)) cfg.paths
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// mapAttrs' (n: v: nameValuePair "${n}.service" (serviceToUnit n v)) cfg.services
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@ -150,6 +150,41 @@ in
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"systemd-tmpfiles-setup.service"
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];
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# Allow systemd-tmpfiles to be restarted by switch-to-configuration. This
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# service is not pulled into the normal boot process. It only exists for
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# switch-to-configuration.
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#
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# This needs to be a separate unit because it does not execute
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# systemd-tmpfiles with `--boot` as that is supposed to only be executed
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# once at boot time.
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#
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# Keep this aligned with the upstream `systemd-tmpfiles-setup.service` unit.
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systemd.services."systemd-tmpfiles-resetup" = {
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description = "Re-setup tmpfiles on a system that is already running.";
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requiredBy = [ "sysinit-reactivation.target" ];
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after = [ "local-fs.target" "systemd-sysusers.service" "systemd-journald.service" ];
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before = [ "sysinit-reactivation.target" "shutdown.target" ];
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conflicts = [ "shutdown.target" ];
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restartTriggers = [ config.environment.etc."tmpfiles.d".source ];
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unitConfig.DefaultDependencies = false;
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = "systemd-tmpfiles --create --remove --exclude-prefix=/dev";
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SuccessExitStatus = "DATAERR CANTCREAT";
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ImportCredential = [
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"tmpfiles.*"
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"loging.motd"
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"login.issue"
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"network.hosts"
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"ssh.authorized_keys.root"
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];
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};
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};
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environment.etc = {
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"tmpfiles.d".source = (pkgs.symlinkJoin {
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name = "tmpfiles.d";
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@ -819,6 +819,7 @@ in {
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syncthing-init = handleTest ./syncthing-init.nix {};
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syncthing-many-devices = handleTest ./syncthing-many-devices.nix {};
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syncthing-relay = handleTest ./syncthing-relay.nix {};
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sysinit-reactivation = runTest ./sysinit-reactivation.nix;
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systemd = handleTest ./systemd.nix {};
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systemd-analyze = handleTest ./systemd-analyze.nix {};
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systemd-binfmt = handleTestOn ["x86_64-linux"] ./systemd-binfmt.nix {};
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107
nixos/tests/sysinit-reactivation.nix
Normal file
107
nixos/tests/sysinit-reactivation.nix
Normal file
@ -0,0 +1,107 @@
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# This runs to two scenarios but in one tests:
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# - A post-sysinit service needs to be restarted AFTER tmpfiles was restarted.
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# - A service needs to be restarted BEFORE tmpfiles is restarted
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{ lib, ... }:
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let
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makeGeneration = generation: {
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"${generation}".configuration = {
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systemd.services.pre-sysinit-before-tmpfiles.environment.USER =
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lib.mkForce "${generation}-tmpfiles-user";
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systemd.services.pre-sysinit-after-tmpfiles.environment = {
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NEEDED_PATH = lib.mkForce "/run/${generation}-needed-by-pre-sysinit-after-tmpfiles";
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PATH_TO_CREATE = lib.mkForce "/run/${generation}-needed-by-post-sysinit";
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};
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systemd.services.post-sysinit.environment = {
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NEEDED_PATH = lib.mkForce "/run/${generation}-needed-by-post-sysinit";
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PATH_TO_CREATE = lib.mkForce "/run/${generation}-created-by-post-sysinit";
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};
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systemd.tmpfiles.settings.test = lib.mkForce {
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"/run/${generation}-needed-by-pre-sysinit-after-tmpfiles".f.user =
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"${generation}-tmpfiles-user";
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};
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};
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};
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in
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{
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name = "sysinit-reactivation";
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meta.maintainers = with lib.maintainers; [ nikstur ];
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nodes.machine = { config, lib, pkgs, ... }: {
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systemd.services.pre-sysinit-before-tmpfiles = {
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wantedBy = [ "sysinit.target" ];
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requiredBy = [ "sysinit-reactivation.target" ];
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before = [ "systemd-tmpfiles-setup.service" "systemd-tmpfiles-resetup.service" ];
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unitConfig.DefaultDependencies = false;
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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environment.USER = "tmpfiles-user";
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script = "${pkgs.shadow}/bin/useradd $USER";
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};
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systemd.services.pre-sysinit-after-tmpfiles = {
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wantedBy = [ "sysinit.target" ];
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requiredBy = [ "sysinit-reactivation.target" ];
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after = [ "systemd-tmpfiles-setup.service" "systemd-tmpfiles-resetup.service" ];
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unitConfig.DefaultDependencies = false;
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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environment = {
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NEEDED_PATH = "/run/needed-by-pre-sysinit-after-tmpfiles";
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PATH_TO_CREATE = "/run/needed-by-post-sysinit";
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};
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script = ''
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if [[ -e $NEEDED_PATH ]]; then
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touch $PATH_TO_CREATE
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fi
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'';
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};
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systemd.services.post-sysinit = {
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wantedBy = [ "default.target" ];
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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environment = {
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NEEDED_PATH = "/run/needed-by-post-sysinit";
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PATH_TO_CREATE = "/run/created-by-post-sysinit";
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};
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script = ''
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if [[ -e $NEEDED_PATH ]]; then
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touch $PATH_TO_CREATE
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fi
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'';
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};
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systemd.tmpfiles.settings.test = {
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"/run/needed-by-pre-sysinit-after-tmpfiles".f.user =
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"tmpfiles-user";
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};
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specialisation = lib.mkMerge [
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(makeGeneration "second")
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(makeGeneration "third")
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];
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};
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testScript = { nodes, ... }: ''
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def switch(generation):
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toplevel = "${nodes.machine.system.build.toplevel}";
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machine.succeed(f"{toplevel}/specialisation/{generation}/bin/switch-to-configuration switch")
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machine.wait_for_unit("default.target")
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machine.succeed("test -e /run/created-by-post-sysinit")
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switch("second")
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machine.succeed("test -e /run/second-created-by-post-sysinit")
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switch("third")
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machine.succeed("test -e /run/third-created-by-post-sysinit")
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'';
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}
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