nixpkgs/nixos/modules/system/boot/systemd.nix
r-vdp 9258f57625
systemd: add a name option to all systemd units
This allows us to set things like dependencies in a way that we can
catch typos at eval time.
So instead of
```nix
systemd.services.foo.wants = [ "bar.service" ];
```
we can write
```nix
systemd.services.foo.wants = [ config.systemd.services.bar.name ];
```
which will throw an error if no such service has been defined.

Not all cases can be done like this (eg template services), but in a lot
of cases this will allow to avoid typos.

There is a matching option on the unit option
(`systemd.units."foo.service".name`) as well.
2024-04-15 11:32:45 +02:00

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{ config, lib, pkgs, utils, ... }:
with utils;
with systemdUtils.unitOptions;
with lib;
let
cfg = config.systemd;
inherit (systemdUtils.lib)
generateUnits
targetToUnit
serviceToUnit
socketToUnit
timerToUnit
pathToUnit
mountToUnit
automountToUnit
sliceToUnit;
upstreamSystemUnits =
[ # Targets.
"basic.target"
"sysinit.target"
"sockets.target"
"exit.target"
"graphical.target"
"multi-user.target"
"network.target"
"network-pre.target"
"network-online.target"
"nss-lookup.target"
"nss-user-lookup.target"
"time-sync.target"
] ++ optionals cfg.package.withCryptsetup [
"cryptsetup.target"
"cryptsetup-pre.target"
"remote-cryptsetup.target"
] ++ [
"sigpwr.target"
"timers.target"
"paths.target"
"rpcbind.target"
# Rescue mode.
"rescue.target"
"rescue.service"
# systemd-debug-generator
"debug-shell.service"
# Udev.
"systemd-tmpfiles-setup-dev-early.service"
"systemd-udevd-control.socket"
"systemd-udevd-kernel.socket"
"systemd-udevd.service"
"systemd-udev-settle.service"
] ++ (optional (!config.boot.isContainer) "systemd-udev-trigger.service") ++ [
# hwdb.bin is managed by NixOS
# "systemd-hwdb-update.service"
# Consoles.
"getty.target"
"getty-pre.target"
"getty@.service"
"serial-getty@.service"
"console-getty.service"
"container-getty@.service"
"systemd-vconsole-setup.service"
# Hardware (started by udev when a relevant device is plugged in).
"sound.target"
"bluetooth.target"
"printer.target"
"smartcard.target"
# Kernel module loading.
"systemd-modules-load.service"
"kmod-static-nodes.service"
"modprobe@.service"
# Filesystems.
"systemd-fsck@.service"
"systemd-fsck-root.service"
"systemd-growfs@.service"
"systemd-growfs-root.service"
"systemd-remount-fs.service"
"systemd-pstore.service"
"local-fs.target"
"local-fs-pre.target"
"remote-fs.target"
"remote-fs-pre.target"
"swap.target"
"dev-hugepages.mount"
"dev-mqueue.mount"
"sys-fs-fuse-connections.mount"
] ++ (optional (!config.boot.isContainer) "sys-kernel-config.mount") ++ [
"sys-kernel-debug.mount"
# Maintaining state across reboots.
"systemd-random-seed.service"
] ++ (optional cfg.package.withBootloader "systemd-boot-random-seed.service") ++ [
"systemd-backlight@.service"
"systemd-rfkill.service"
"systemd-rfkill.socket"
# Hibernate / suspend.
"hibernate.target"
"suspend.target"
"suspend-then-hibernate.target"
"sleep.target"
"hybrid-sleep.target"
"systemd-hibernate.service"
"systemd-hybrid-sleep.service"
"systemd-suspend.service"
"systemd-suspend-then-hibernate.service"
# Reboot stuff.
"reboot.target"
"systemd-reboot.service"
"poweroff.target"
"systemd-poweroff.service"
"halt.target"
"systemd-halt.service"
"shutdown.target"
"umount.target"
"final.target"
"kexec.target"
"systemd-kexec.service"
] ++ lib.optional cfg.package.withUtmp "systemd-update-utmp.service" ++ [
# Password entry.
"systemd-ask-password-console.path"
"systemd-ask-password-console.service"
"systemd-ask-password-wall.path"
"systemd-ask-password-wall.service"
# Slices / containers.
"slices.target"
] ++ optionals cfg.package.withImportd [
"systemd-importd.service"
] ++ optionals cfg.package.withMachined [
"machine.slice"
"machines.target"
"systemd-machined.service"
] ++ [
"systemd-nspawn@.service"
# Misc.
"systemd-sysctl.service"
] ++ optionals cfg.package.withTimedated [
"dbus-org.freedesktop.timedate1.service"
"systemd-timedated.service"
] ++ optionals cfg.package.withLocaled [
"dbus-org.freedesktop.locale1.service"
"systemd-localed.service"
] ++ optionals cfg.package.withHostnamed [
"dbus-org.freedesktop.hostname1.service"
"systemd-hostnamed.service"
] ++ optionals cfg.package.withPortabled [
"dbus-org.freedesktop.portable1.service"
"systemd-portabled.service"
] ++ [
"systemd-exit.service"
"systemd-update-done.service"
] ++ cfg.additionalUpstreamSystemUnits;
upstreamSystemWants =
[ "sysinit.target.wants"
"sockets.target.wants"
"local-fs.target.wants"
"multi-user.target.wants"
"timers.target.wants"
];
proxy_env = config.networking.proxy.envVars;
in
{
###### interface
options.systemd = {
package = mkPackageOption pkgs "systemd" {};
units = mkOption {
description = "Definition of systemd units; see {manpage}`systemd.unit(5)`.";
default = {};
type = systemdUtils.types.units;
};
packages = mkOption {
default = [];
type = types.listOf types.package;
example = literalExpression "[ pkgs.systemd-cryptsetup-generator ]";
description = "Packages providing systemd units and hooks.";
};
targets = mkOption {
default = {};
type = systemdUtils.types.targets;
description = "Definition of systemd target units; see {manpage}`systemd.target(5)`";
};
services = mkOption {
default = {};
type = systemdUtils.types.services;
description = "Definition of systemd service units; see {manpage}`systemd.service(5)`.";
};
sockets = mkOption {
default = {};
type = systemdUtils.types.sockets;
description = "Definition of systemd socket units; see {manpage}`systemd.socket(5)`.";
};
timers = mkOption {
default = {};
type = systemdUtils.types.timers;
description = "Definition of systemd timer units; see {manpage}`systemd.timer(5)`.";
};
paths = mkOption {
default = {};
type = systemdUtils.types.paths;
description = "Definition of systemd path units; see {manpage}`systemd.path(5)`.";
};
mounts = mkOption {
default = [];
type = systemdUtils.types.mounts;
description = ''
Definition of systemd mount units; see {manpage}`systemd.mount(5)`.
This is a list instead of an attrSet, because systemd mandates
the names to be derived from the `where` attribute.
'';
};
automounts = mkOption {
default = [];
type = systemdUtils.types.automounts;
description = ''
Definition of systemd automount units; see {manpage}`systemd.automount(5)`.
This is a list instead of an attrSet, because systemd mandates
the names to be derived from the `where` attribute.
'';
};
slices = mkOption {
default = {};
type = systemdUtils.types.slices;
description = "Definition of slice configurations; see {manpage}`systemd.slice(5)`.";
};
generators = mkOption {
type = types.attrsOf types.path;
default = {};
example = { systemd-gpt-auto-generator = "/dev/null"; };
description = ''
Definition of systemd generators; see {manpage}`systemd.generator(5)`.
For each `NAME = VALUE` pair of the attrSet, a link is generated from
`/etc/systemd/system-generators/NAME` to `VALUE`.
'';
};
shutdown = mkOption {
type = types.attrsOf types.path;
default = {};
description = ''
Definition of systemd shutdown executables.
For each `NAME = VALUE` pair of the attrSet, a link is generated from
`/etc/systemd/system-shutdown/NAME` to `VALUE`.
'';
};
defaultUnit = mkOption {
default = "multi-user.target";
type = types.str;
description = ''
Default unit started when the system boots; see {manpage}`systemd.special(7)`.
'';
};
ctrlAltDelUnit = mkOption {
default = "reboot.target";
type = types.str;
example = "poweroff.target";
description = ''
Target that should be started when Ctrl-Alt-Delete is pressed;
see {manpage}`systemd.special(7)`.
'';
};
globalEnvironment = mkOption {
type = with types; attrsOf (nullOr (oneOf [ str path package ]));
default = {};
example = { TZ = "CET"; };
description = ''
Environment variables passed to *all* systemd units.
'';
};
managerEnvironment = mkOption {
type = with types; attrsOf (nullOr (oneOf [ str path package ]));
default = {};
example = { SYSTEMD_LOG_LEVEL = "debug"; };
description = ''
Environment variables of PID 1. These variables are
*not* passed to started units.
'';
};
enableCgroupAccounting = mkOption {
default = true;
type = types.bool;
description = ''
Whether to enable cgroup accounting; see {manpage}`cgroups(7)`.
'';
};
enableUnifiedCgroupHierarchy = mkOption {
default = true;
type = types.bool;
description = ''
Whether to enable the unified cgroup hierarchy (cgroupsv2); see {manpage}`cgroups(7)`.
'';
};
extraConfig = mkOption {
default = "";
type = types.lines;
example = "DefaultLimitCORE=infinity";
description = ''
Extra config options for systemd. See {manpage}`systemd-system.conf(5)` man page
for available options.
'';
};
sleep.extraConfig = mkOption {
default = "";
type = types.lines;
example = "HibernateDelaySec=1h";
description = ''
Extra config options for systemd sleep state logic.
See {manpage}`sleep.conf.d(5)` man page for available options.
'';
};
additionalUpstreamSystemUnits = mkOption {
default = [ ];
type = types.listOf types.str;
example = [ "debug-shell.service" "systemd-quotacheck.service" ];
description = ''
Additional units shipped with systemd that shall be enabled.
'';
};
suppressedSystemUnits = mkOption {
default = [ ];
type = types.listOf types.str;
example = [ "systemd-backlight@.service" ];
description = ''
A list of units to skip when generating system systemd configuration directory. This has
priority over upstream units, {option}`systemd.units`, and
{option}`systemd.additionalUpstreamSystemUnits`. The main purpose of this is to
prevent a upstream systemd unit from being added to the initrd with any modifications made to it
by other NixOS modules.
'';
};
watchdog.device = mkOption {
type = types.nullOr types.path;
default = null;
example = "/dev/watchdog";
description = ''
The path to a hardware watchdog device which will be managed by systemd.
If not specified, systemd will default to `/dev/watchdog`.
'';
};
watchdog.runtimeTime = mkOption {
type = types.nullOr types.str;
default = null;
example = "30s";
description = ''
The amount of time which can elapse before a watchdog hardware device
will automatically reboot the system.
Valid time units include "ms", "s", "min", "h", "d", and "w";
see {manpage}`systemd.time(7)`.
'';
};
watchdog.rebootTime = mkOption {
type = types.nullOr types.str;
default = null;
example = "10m";
description = ''
The amount of time which can elapse after a reboot has been triggered
before a watchdog hardware device will automatically reboot the system.
If left `null`, systemd will use its default of 10 minutes;
see {manpage}`systemd-system.conf(5)`.
Valid time units include "ms", "s", "min", "h", "d", and "w";
see also {manpage}`systemd.time(7)`.
'';
};
watchdog.kexecTime = mkOption {
type = types.nullOr types.str;
default = null;
example = "10m";
description = ''
The amount of time which can elapse when `kexec` is being executed before
a watchdog hardware device will automatically reboot the system. This
option should only be enabled if `reloadTime` is also enabled;
see {manpage}`kexec(8)`.
Valid time units include "ms", "s", "min", "h", "d", and "w";
see also {manpage}`systemd.time(7)`.
'';
};
};
###### implementation
config = {
warnings = let
mkOneNetOnlineWarn = typeStr: name: def: lib.optional
(lib.elem "network-online.target" def.after && !(lib.elem "network-online.target" (def.wants ++ def.requires ++ def.bindsTo)))
"${name}.${typeStr} is ordered after 'network-online.target' but doesn't depend on it";
mkNetOnlineWarns = typeStr: defs: lib.concatLists (lib.mapAttrsToList (mkOneNetOnlineWarn typeStr) defs);
mkMountNetOnlineWarns = typeStr: defs: lib.concatLists (map (m: mkOneNetOnlineWarn typeStr m.what m) defs);
in concatLists (
mapAttrsToList
(name: service:
let
type = service.serviceConfig.Type or "";
restart = service.serviceConfig.Restart or "no";
hasDeprecated = builtins.hasAttr "StartLimitInterval" service.serviceConfig;
in
concatLists [
(optional (type == "oneshot" && (restart == "always" || restart == "on-success"))
"Service '${name}.service' with 'Type=oneshot' cannot have 'Restart=always' or 'Restart=on-success'"
)
(optional hasDeprecated
"Service '${name}.service' uses the attribute 'StartLimitInterval' in the Service section, which is deprecated. See https://github.com/NixOS/nixpkgs/issues/45786."
)
(optional (service.reloadIfChanged && service.reloadTriggers != [])
"Service '${name}.service' has both 'reloadIfChanged' and 'reloadTriggers' set. This is probably not what you want, because 'reloadTriggers' behave the same whay as 'restartTriggers' if 'reloadIfChanged' is set."
)
]
)
cfg.services
)
++ (mkNetOnlineWarns "target" cfg.targets)
++ (mkNetOnlineWarns "service" cfg.services)
++ (mkNetOnlineWarns "socket" cfg.sockets)
++ (mkNetOnlineWarns "timer" cfg.timers)
++ (mkNetOnlineWarns "path" cfg.paths)
++ (mkMountNetOnlineWarns "mount" cfg.mounts)
++ (mkMountNetOnlineWarns "automount" cfg.automounts)
++ (mkNetOnlineWarns "slice" cfg.slices);
assertions = concatLists (
mapAttrsToList
(name: service:
map (message: {
assertion = false;
inherit message;
}) (concatLists [
(optional ((builtins.elem "network-interfaces.target" service.after) || (builtins.elem "network-interfaces.target" service.wants))
"Service '${name}.service' is using the deprecated target network-interfaces.target, which no longer exists. Using network.target is recommended instead."
)
])
)
cfg.services
);
system.build.units = cfg.units;
system.nssModules = [ cfg.package.out ];
system.nssDatabases = {
hosts = (mkMerge [
(mkOrder 400 ["mymachines"]) # 400 to ensure it comes before resolve (which is mkBefore'd)
(mkOrder 999 ["myhostname"]) # after files (which is 998), but before regular nss modules
]);
passwd = (mkMerge [
(mkAfter [ "systemd" ])
]);
group = (mkMerge [
(mkAfter [ "[success=merge] systemd" ]) # need merge so that NSS won't stop at file-based groups
]);
};
environment.systemPackages = [ cfg.package ];
environment.etc = let
# generate contents for /etc/systemd/system-${type} from attrset of links and packages
hooks = type: links: pkgs.runCommand "system-${type}" {
preferLocalBuild = true;
packages = cfg.packages;
} ''
set -e
mkdir -p $out
for package in $packages
do
for hook in $package/lib/systemd/system-${type}/*
do
ln -s $hook $out/
done
done
${concatStrings (mapAttrsToList (exec: target: "ln -s ${target} $out/${exec};\n") links)}
'';
enabledUpstreamSystemUnits = filter (n: ! elem n cfg.suppressedSystemUnits) upstreamSystemUnits;
enabledUnits = filterAttrs (n: v: ! elem n cfg.suppressedSystemUnits) cfg.units;
in ({
"systemd/system".source = generateUnits {
type = "system";
units = enabledUnits;
upstreamUnits = enabledUpstreamSystemUnits;
upstreamWants = upstreamSystemWants;
};
"systemd/system.conf".text = ''
[Manager]
ManagerEnvironment=${lib.concatStringsSep " " (lib.mapAttrsToList (n: v: "${n}=${lib.escapeShellArg v}") cfg.managerEnvironment)}
${optionalString cfg.enableCgroupAccounting ''
DefaultCPUAccounting=yes
DefaultIOAccounting=yes
DefaultBlockIOAccounting=yes
DefaultIPAccounting=yes
''}
DefaultLimitCORE=infinity
${optionalString (cfg.watchdog.device != null) ''
WatchdogDevice=${cfg.watchdog.device}
''}
${optionalString (cfg.watchdog.runtimeTime != null) ''
RuntimeWatchdogSec=${cfg.watchdog.runtimeTime}
''}
${optionalString (cfg.watchdog.rebootTime != null) ''
RebootWatchdogSec=${cfg.watchdog.rebootTime}
''}
${optionalString (cfg.watchdog.kexecTime != null) ''
KExecWatchdogSec=${cfg.watchdog.kexecTime}
''}
${cfg.extraConfig}
'';
"systemd/sleep.conf".text = ''
[Sleep]
${cfg.sleep.extraConfig}
'';
"systemd/system-generators" = { source = hooks "generators" cfg.generators; };
"systemd/system-shutdown" = { source = hooks "shutdown" cfg.shutdown; };
});
services.dbus.enable = true;
users.users.systemd-network = {
uid = config.ids.uids.systemd-network;
group = "systemd-network";
};
users.groups.systemd-network.gid = config.ids.gids.systemd-network;
users.users.systemd-resolve = {
uid = config.ids.uids.systemd-resolve;
group = "systemd-resolve";
};
users.groups.systemd-resolve.gid = config.ids.gids.systemd-resolve;
# Target for charon send-keys to hook into.
users.groups.keys.gid = config.ids.gids.keys;
systemd.targets.keys =
{ description = "Security Keys";
unitConfig.X-StopOnReconfiguration = true;
};
# This target only exists so that services ordered before sysinit.target
# are restarted in the correct order, notably BEFORE the other services,
# when switching configurations.
systemd.targets.sysinit-reactivation = {
description = "Reactivate sysinit units";
};
systemd.units =
let
withName = cfgToUnit: cfg: lib.nameValuePair cfg.name (cfgToUnit cfg);
in
mapAttrs' (_: withName pathToUnit) cfg.paths
// mapAttrs' (_: withName serviceToUnit) cfg.services
// mapAttrs' (_: withName sliceToUnit) cfg.slices
// mapAttrs' (_: withName socketToUnit) cfg.sockets
// mapAttrs' (_: withName targetToUnit) cfg.targets
// mapAttrs' (_: withName timerToUnit) cfg.timers
// listToAttrs (map (withName mountToUnit) cfg.mounts)
// listToAttrs (map (withName automountToUnit) cfg.automounts);
# Environment of PID 1
systemd.managerEnvironment = {
# Doesn't contain systemd itself - everything works so it seems to use the compiled-in value for its tools
# util-linux is needed for the main fsck utility wrapping the fs-specific ones
PATH = lib.makeBinPath (config.system.fsPackages ++ [cfg.package.util-linux]);
LOCALE_ARCHIVE = "/run/current-system/sw/lib/locale/locale-archive";
TZDIR = "/etc/zoneinfo";
# If SYSTEMD_UNIT_PATH ends with an empty component (":"), the usual unit load path will be appended to the contents of the variable
SYSTEMD_UNIT_PATH = lib.mkIf (config.boot.extraSystemdUnitPaths != []) "${builtins.concatStringsSep ":" config.boot.extraSystemdUnitPaths}:";
};
system.requiredKernelConfig = map config.lib.kernelConfig.isEnabled
[ "DEVTMPFS" "CGROUPS" "INOTIFY_USER" "SIGNALFD" "TIMERFD" "EPOLL" "NET"
"SYSFS" "PROC_FS" "FHANDLE" "CRYPTO_USER_API_HASH" "CRYPTO_HMAC"
"CRYPTO_SHA256" "DMIID" "AUTOFS_FS" "TMPFS_POSIX_ACL"
"TMPFS_XATTR" "SECCOMP"
];
# Generate timer units for all services that have a startAt value.
systemd.timers =
mapAttrs (name: service:
{ wantedBy = [ "timers.target" ];
timerConfig.OnCalendar = service.startAt;
})
(filterAttrs (name: service: service.enable && service.startAt != []) cfg.services);
# Some overrides to upstream units.
systemd.services."systemd-backlight@".restartIfChanged = false;
systemd.services."systemd-fsck@".restartIfChanged = false;
systemd.services."systemd-fsck@".path = [ pkgs.util-linux ] ++ config.system.fsPackages;
systemd.services."systemd-makefs@" = {
restartIfChanged = false;
path = [ pkgs.util-linux ] ++ config.system.fsPackages;
# Since there is no /etc/systemd/system/systemd-makefs@.service
# file, the units generated in /run/systemd/generator would
# override anything we put here. But by forcing the use of a
# drop-in in /etc, it does apply.
overrideStrategy = "asDropin";
};
systemd.services."systemd-mkswap@" = {
restartIfChanged = false;
path = [ pkgs.util-linux ];
overrideStrategy = "asDropin";
};
systemd.services.systemd-random-seed.restartIfChanged = false;
systemd.services.systemd-remount-fs.restartIfChanged = false;
systemd.services.systemd-update-utmp.restartIfChanged = false;
systemd.services.systemd-udev-settle.restartIfChanged = false; # Causes long delays in nixos-rebuild
systemd.targets.local-fs.unitConfig.X-StopOnReconfiguration = true;
systemd.targets.remote-fs.unitConfig.X-StopOnReconfiguration = true;
systemd.targets.network-online.wantedBy = [ "multi-user.target" ];
systemd.services.systemd-importd.environment = proxy_env;
systemd.services.systemd-pstore.wantedBy = [ "sysinit.target" ]; # see #81138
# NixOS has kernel modules in a different location, so override that here.
systemd.services.kmod-static-nodes.unitConfig.ConditionFileNotEmpty = [
"" # required to unset the previous value!
"/run/booted-system/kernel-modules/lib/modules/%v/modules.devname"
];
# Don't bother with certain units in containers.
systemd.services.systemd-remount-fs.unitConfig.ConditionVirtualization = "!container";
# Increase numeric PID range (set directly instead of copying a one-line file from systemd)
# https://github.com/systemd/systemd/pull/12226
boot.kernel.sysctl."kernel.pid_max" = mkIf pkgs.stdenv.is64bit (lib.mkDefault 4194304);
boot.kernelParams = optional (!cfg.enableUnifiedCgroupHierarchy) "systemd.unified_cgroup_hierarchy=0";
# Avoid potentially degraded system state due to
# "Userspace Out-Of-Memory (OOM) Killer was skipped because of a failed condition check (ConditionControlGroupController=v2)."
systemd.oomd.enable = mkIf (!cfg.enableUnifiedCgroupHierarchy) false;
services.logrotate.settings = {
"/var/log/btmp" = mapAttrs (_: mkDefault) {
frequency = "monthly";
rotate = 1;
create = "0660 root ${config.users.groups.utmp.name}";
minsize = "1M";
};
"/var/log/wtmp" = mapAttrs (_: mkDefault) {
frequency = "monthly";
rotate = 1;
create = "0664 root ${config.users.groups.utmp.name}";
minsize = "1M";
};
};
};
# FIXME: Remove these eventually.
imports =
[ (mkRenamedOptionModule [ "boot" "systemd" "sockets" ] [ "systemd" "sockets" ])
(mkRenamedOptionModule [ "boot" "systemd" "targets" ] [ "systemd" "targets" ])
(mkRenamedOptionModule [ "boot" "systemd" "services" ] [ "systemd" "services" ])
(mkRenamedOptionModule [ "jobs" ] [ "systemd" "services" ])
(mkRemovedOptionModule [ "systemd" "generator-packages" ] "Use systemd.packages instead.")
];
}