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nixpkgs/nixos/modules/system/boot/systemd.nix
Christian Kauhaus 3530f3f20a systemd: make ctrl-alt-del target configurable. (#16911)
We currently only allow upstream's default of "reboot.target" due to the
way the symlinks are initialized. I made this configurable similar to the
default unit.
2016-07-19 09:42:53 +02:00

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{ config, lib, pkgs, utils, ... }:
with utils;
with lib;
with import ./systemd-unit-options.nix { inherit config lib; };
with import ./systemd-lib.nix { inherit config lib pkgs; };
let
cfg = config.systemd;
systemd = cfg.package;
upstreamSystemUnits =
[ # Targets.
"basic.target"
"sysinit.target"
"sockets.target"
"graphical.target"
"multi-user.target"
"network.target"
"network-pre.target"
"network-online.target"
"nss-lookup.target"
"nss-user-lookup.target"
"time-sync.target"
#"cryptsetup.target"
"sigpwr.target"
"timers.target"
"paths.target"
"rpcbind.target"
# Rescue mode.
"rescue.target"
"rescue.service"
# Udev.
"systemd-udevd-control.socket"
"systemd-udevd-kernel.socket"
"systemd-udevd.service"
"systemd-udev-settle.service"
"systemd-udev-trigger.service"
# Consoles.
"getty.target"
"getty@.service"
"serial-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"
# Login stuff.
"systemd-logind.service"
"autovt@.service"
#"systemd-vconsole-setup.service"
"systemd-user-sessions.service"
"dbus-org.freedesktop.login1.service"
"dbus-org.freedesktop.machine1.service"
"org.freedesktop.login1.busname"
"org.freedesktop.machine1.busname"
"user@.service"
# Journal.
"systemd-journald.socket"
"systemd-journald.service"
"systemd-journal-flush.service"
"systemd-journal-gatewayd.socket"
"systemd-journal-gatewayd.service"
"systemd-journald-audit.socket"
"systemd-journald-dev-log.socket"
"syslog.socket"
# SysV init compatibility.
"systemd-initctl.socket"
"systemd-initctl.service"
# Kernel module loading.
"systemd-modules-load.service"
"kmod-static-nodes.service"
# Filesystems.
"systemd-fsck@.service"
"systemd-fsck-root.service"
"systemd-remount-fs.service"
"local-fs.target"
"local-fs-pre.target"
"remote-fs.target"
"remote-fs-pre.target"
"swap.target"
"dev-hugepages.mount"
"dev-mqueue.mount"
"proc-sys-fs-binfmt_misc.mount"
"sys-fs-fuse-connections.mount"
"sys-kernel-config.mount"
"sys-kernel-debug.mount"
# Maintaining state across reboots.
"systemd-random-seed.service"
"systemd-backlight@.service"
"systemd-rfkill.service"
# Hibernate / suspend.
"hibernate.target"
"suspend.target"
"sleep.target"
"hybrid-sleep.target"
"systemd-hibernate.service"
"systemd-suspend.service"
"systemd-hybrid-sleep.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"
"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"
"-.slice"
"system.slice"
"user.slice"
"machine.slice"
"systemd-machined.service"
# Temporary file creation / cleanup.
"systemd-tmpfiles-clean.service"
"systemd-tmpfiles-clean.timer"
"systemd-tmpfiles-setup.service"
"systemd-tmpfiles-setup-dev.service"
# Misc.
"org.freedesktop.systemd1.busname"
"systemd-sysctl.service"
"dbus-org.freedesktop.timedate1.service"
"dbus-org.freedesktop.locale1.service"
"dbus-org.freedesktop.hostname1.service"
"org.freedesktop.timedate1.busname"
"org.freedesktop.locale1.busname"
"org.freedesktop.hostname1.busname"
"systemd-timedated.service"
"systemd-localed.service"
"systemd-hostnamed.service"
"systemd-binfmt.service"
]
++ cfg.additionalUpstreamSystemUnits;
upstreamSystemWants =
[ #"basic.target.wants"
"sysinit.target.wants"
"sockets.target.wants"
"local-fs.target.wants"
"multi-user.target.wants"
"timers.target.wants"
];
upstreamUserUnits =
[ "basic.target"
"default.target"
"exit.target"
"paths.target"
"shutdown.target"
"sockets.target"
"systemd-exit.service"
"timers.target"
];
makeJobScript = name: text:
let mkScriptName = s: (replaceChars [ "\\" ] [ "-" ] (shellEscape s) );
x = pkgs.writeTextFile { name = "unit-script"; executable = true; destination = "/bin/${mkScriptName name}"; inherit text; };
in "${x}/bin/${mkScriptName name}";
unitConfig = { name, config, ... }: {
config = {
unitConfig =
optionalAttrs (config.requires != [])
{ Requires = toString config.requires; }
// optionalAttrs (config.wants != [])
{ Wants = toString config.wants; }
// optionalAttrs (config.after != [])
{ After = toString config.after; }
// optionalAttrs (config.before != [])
{ Before = toString config.before; }
// optionalAttrs (config.bindsTo != [])
{ BindsTo = toString config.bindsTo; }
// optionalAttrs (config.partOf != [])
{ PartOf = toString config.partOf; }
// optionalAttrs (config.conflicts != [])
{ Conflicts = toString config.conflicts; }
// optionalAttrs (config.requisite != [])
{ Requisite = toString config.requisite; }
// optionalAttrs (config.restartTriggers != [])
{ X-Restart-Triggers = toString config.restartTriggers; }
// optionalAttrs (config.description != "") {
Description = config.description;
} // optionalAttrs (config.onFailure != []) {
OnFailure = toString config.onFailure;
};
};
};
serviceConfig = { name, config, ... }: {
config = mkMerge
[ { # Default path for systemd services. Should be quite minimal.
path =
[ pkgs.coreutils
pkgs.findutils
pkgs.gnugrep
pkgs.gnused
systemd
];
environment.PATH = config.path;
}
(mkIf (config.preStart != "")
{ serviceConfig.ExecStartPre = makeJobScript "${name}-pre-start" ''
#! ${pkgs.stdenv.shell} -e
${config.preStart}
'';
})
(mkIf (config.script != "")
{ serviceConfig.ExecStart = makeJobScript "${name}-start" ''
#! ${pkgs.stdenv.shell} -e
${config.script}
'' + " " + config.scriptArgs;
})
(mkIf (config.postStart != "")
{ serviceConfig.ExecStartPost = makeJobScript "${name}-post-start" ''
#! ${pkgs.stdenv.shell} -e
${config.postStart}
'';
})
(mkIf (config.reload != "")
{ serviceConfig.ExecReload = makeJobScript "${name}-reload" ''
#! ${pkgs.stdenv.shell} -e
${config.reload}
'';
})
(mkIf (config.preStop != "")
{ serviceConfig.ExecStop = makeJobScript "${name}-pre-stop" ''
#! ${pkgs.stdenv.shell} -e
${config.preStop}
'';
})
(mkIf (config.postStop != "")
{ serviceConfig.ExecStopPost = makeJobScript "${name}-post-stop" ''
#! ${pkgs.stdenv.shell} -e
${config.postStop}
'';
})
];
};
mountConfig = { name, config, ... }: {
config = {
mountConfig =
{ What = config.what;
Where = config.where;
} // optionalAttrs (config.type != "") {
Type = config.type;
} // optionalAttrs (config.options != "") {
Options = config.options;
};
};
};
automountConfig = { name, config, ... }: {
config = {
automountConfig =
{ Where = config.where;
};
};
};
commonUnitText = def: ''
[Unit]
${attrsToSection def.unitConfig}
'';
targetToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text =
''
[Unit]
${attrsToSection def.unitConfig}
'';
};
serviceToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text = commonUnitText def +
''
[Service]
${let env = cfg.globalEnvironment // def.environment;
in concatMapStrings (n:
let s = optionalString (env."${n}" != null)
"Environment=\"${n}=${env.${n}}\"\n";
in if stringLength s >= 2048 then throw "The value of the environment variable ${n} in systemd service ${name}.service is too long." else s) (attrNames env)}
${if def.reloadIfChanged then ''
X-ReloadIfChanged=true
'' else if !def.restartIfChanged then ''
X-RestartIfChanged=false
'' else ""}
${optionalString (!def.stopIfChanged) "X-StopIfChanged=false"}
${attrsToSection def.serviceConfig}
'';
};
socketToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text = commonUnitText def +
''
[Socket]
${attrsToSection def.socketConfig}
${concatStringsSep "\n" (map (s: "ListenStream=${s}") def.listenStreams)}
'';
};
timerToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text = commonUnitText def +
''
[Timer]
${attrsToSection def.timerConfig}
'';
};
pathToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text = commonUnitText def +
''
[Path]
${attrsToSection def.pathConfig}
'';
};
mountToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text = commonUnitText def +
''
[Mount]
${attrsToSection def.mountConfig}
'';
};
automountToUnit = name: def:
{ inherit (def) wantedBy requiredBy enable;
text = commonUnitText def +
''
[Automount]
${attrsToSection def.automountConfig}
'';
};
in
{
###### interface
options = {
systemd.package = mkOption {
default = pkgs.systemd;
defaultText = "pkgs.systemd";
type = types.package;
description = "The systemd package.";
};
systemd.units = mkOption {
description = "Definition of systemd units.";
default = {};
type = types.attrsOf types.optionSet;
options = { name, config, ... }:
{ options = concreteUnitOptions;
config = {
unit = mkDefault (makeUnit name config);
};
};
};
systemd.packages = mkOption {
default = [];
type = types.listOf types.package;
description = "Packages providing systemd units.";
};
systemd.targets = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ targetOptions unitConfig ];
description = "Definition of systemd target units.";
};
systemd.services = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ serviceOptions unitConfig serviceConfig ];
description = "Definition of systemd service units.";
};
systemd.sockets = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ socketOptions unitConfig ];
description = "Definition of systemd socket units.";
};
systemd.timers = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ timerOptions unitConfig ];
description = "Definition of systemd timer units.";
};
systemd.paths = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ pathOptions unitConfig ];
description = "Definition of systemd path units.";
};
systemd.mounts = mkOption {
default = [];
type = types.listOf types.optionSet;
options = [ mountOptions unitConfig mountConfig ];
description = ''
Definition of systemd mount units.
This is a list instead of an attrSet, because systemd mandates the names to be derived from
the 'where' attribute.
'';
};
systemd.automounts = mkOption {
default = [];
type = types.listOf types.optionSet;
options = [ automountOptions unitConfig automountConfig ];
description = ''
Definition of systemd automount units.
This is a list instead of an attrSet, because systemd mandates the names to be derived from
the 'where' attribute.
'';
};
systemd.generators = mkOption {
type = types.attrsOf types.path;
default = {};
example = { "systemd-gpt-auto-generator" = "/dev/null"; };
description = ''
Definition of systemd generators.
For each <literal>NAME = VALUE</literal> pair of the attrSet, a link is generated from
<literal>/etc/systemd/system-generators/NAME</literal> to <literal>VALUE</literal>.
'';
};
systemd.generator-packages = mkOption {
default = [];
type = types.listOf types.package;
example = literalExample "[ pkgs.systemd-cryptsetup-generator ]";
description = "Packages providing systemd generators.";
};
systemd.defaultUnit = mkOption {
default = "multi-user.target";
type = types.str;
description = "Default unit started when the system boots.";
};
systemd.ctrlAltDelUnit = mkOption {
default = "reboot.target";
type = types.str;
example = "poweroff.target";
description = ''
Target that should be started when Ctrl-Alt-Delete is pressed.
'';
};
systemd.globalEnvironment = mkOption {
type = types.attrs;
default = {};
example = { TZ = "CET"; };
description = ''
Environment variables passed to <emphasis>all</emphasis> systemd units.
'';
};
systemd.extraConfig = mkOption {
default = "";
type = types.lines;
example = "DefaultLimitCORE=infinity";
description = ''
Extra config options for systemd. See man systemd-system.conf for
available options.
'';
};
services.journald.console = mkOption {
default = "";
type = types.str;
description = "If non-empty, write log messages to the specified TTY device.";
};
services.journald.rateLimitInterval = mkOption {
default = "10s";
type = types.str;
description = ''
Configures the rate limiting interval that is applied to all
messages generated on the system. This rate limiting is applied
per-service, so that two services which log do not interfere with
each other's limit. The value may be specified in the following
units: s, min, h, ms, us. To turn off any kind of rate limiting,
set either value to 0.
'';
};
services.journald.rateLimitBurst = mkOption {
default = 100;
type = types.int;
description = ''
Configures the rate limiting burst limit (number of messages per
interval) that is applied to all messages generated on the system.
This rate limiting is applied per-service, so that two services
which log do not interfere with each other's limit.
'';
};
services.journald.extraConfig = mkOption {
default = "";
type = types.lines;
example = "Storage=volatile";
description = ''
Extra config options for systemd-journald. See man journald.conf
for available options.
'';
};
services.journald.enableHttpGateway = mkOption {
default = false;
type = types.bool;
description = ''
Whether to enable the HTTP gateway to the journal.
'';
};
services.logind.extraConfig = mkOption {
default = "";
type = types.lines;
example = "HandleLidSwitch=ignore";
description = ''
Extra config options for systemd-logind. See man logind.conf for
available options.
'';
};
systemd.tmpfiles.rules = mkOption {
type = types.listOf types.str;
default = [];
example = [ "d /tmp 1777 root root 10d" ];
description = ''
Rules for creating and cleaning up temporary files
automatically. See
<citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for the exact format. You should not use this option to create
files required by systemd services, since there is no
guarantee that <command>systemd-tmpfiles</command> runs when
the system is reconfigured using
<command>nixos-rebuild</command>.
'';
};
systemd.user.units = mkOption {
description = "Definition of systemd per-user units.";
default = {};
type = types.attrsOf types.optionSet;
options = { name, config, ... }:
{ options = concreteUnitOptions;
config = {
unit = mkDefault (makeUnit name config);
};
};
};
systemd.user.services = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ serviceOptions unitConfig serviceConfig ];
description = "Definition of systemd per-user service units.";
};
systemd.user.timers = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ timerOptions unitConfig ];
description = "Definition of systemd per-user timer units.";
};
systemd.user.sockets = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = [ socketOptions unitConfig ];
description = "Definition of systemd per-user socket units.";
};
systemd.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.
'';
};
};
###### implementation
config = {
warnings = concatLists (mapAttrsToList (name: service:
optional (service.serviceConfig.Type or "" == "oneshot" && service.serviceConfig.Restart or "no" != "no")
"Service ${name}.service with Type=oneshot must have Restart=no") cfg.services);
system.build.units = cfg.units;
environment.systemPackages = [ systemd ];
environment.etc = let
# generate contents for /etc/systemd/system-generators from
# systemd.generators and systemd.generator-packages
generators = pkgs.runCommand "system-generators" { packages = cfg.generator-packages; } ''
mkdir -p $out
for package in $packages
do
ln -s $package/lib/systemd/system-generators/* $out/
done;
${concatStrings (mapAttrsToList (generator: target: "ln -s ${target} $out/${generator};\n") cfg.generators)}
'';
in ({
"systemd/system".source = generateUnits "system" cfg.units upstreamSystemUnits upstreamSystemWants;
"systemd/user".source = generateUnits "user" cfg.user.units upstreamUserUnits [];
"systemd/system.conf".text = ''
[Manager]
${config.systemd.extraConfig}
'';
"systemd/journald.conf".text = ''
[Journal]
RateLimitInterval=${config.services.journald.rateLimitInterval}
RateLimitBurst=${toString config.services.journald.rateLimitBurst}
${optionalString (config.services.journald.console != "") ''
ForwardToConsole=yes
TTYPath=${config.services.journald.console}
''}
${config.services.journald.extraConfig}
'';
"systemd/logind.conf".text = ''
[Login]
KillUserProcesses=no
${config.services.logind.extraConfig}
'';
"systemd/sleep.conf".text = ''
[Sleep]
'';
"tmpfiles.d/systemd.conf".source = "${systemd}/example/tmpfiles.d/systemd.conf";
"tmpfiles.d/x11.conf".source = "${systemd}/example/tmpfiles.d/x11.conf";
"tmpfiles.d/nixos.conf".text = ''
# This file is created automatically and should not be modified.
# Please change the option systemd.tmpfiles.rules instead.
${concatStringsSep "\n" cfg.tmpfiles.rules}
'';
"systemd/system-generators" = { source = generators; };
});
services.dbus.enable = true;
system.activationScripts.systemd = stringAfter [ "groups" ]
''
mkdir -m 0755 -p /var/lib/udev
if ! [ -e /etc/machine-id ]; then
${systemd}/bin/systemd-machine-id-setup
fi
# Keep a persistent journal. Note that systemd-tmpfiles will
# set proper ownership/permissions.
mkdir -m 0700 -p /var/log/journal
'';
users.extraUsers.systemd-network.uid = config.ids.uids.systemd-network;
users.extraGroups.systemd-network.gid = config.ids.gids.systemd-network;
users.extraUsers.systemd-resolve.uid = config.ids.uids.systemd-resolve;
users.extraGroups.systemd-resolve.gid = config.ids.gids.systemd-resolve;
# Target for charon send-keys to hook into.
users.extraGroups.keys.gid = config.ids.gids.keys;
systemd.targets.keys =
{ description = "Security Keys";
unitConfig.X-StopOnReconfiguration = true;
};
systemd.targets.network-online.after = [ "ip-up.target" ];
systemd.targets.network-pre = {
wantedBy = [ "network.target" ];
before = [ "network.target" ];
};
systemd.targets.remote-fs-pre = {
wantedBy = [ "remote-fs.target" ];
before = [ "remote-fs.target" ];
};
systemd.units =
mapAttrs' (n: v: nameValuePair "${n}.target" (targetToUnit n v)) cfg.targets
// mapAttrs' (n: v: nameValuePair "${n}.service" (serviceToUnit n v)) cfg.services
// mapAttrs' (n: v: nameValuePair "${n}.socket" (socketToUnit n v)) cfg.sockets
// mapAttrs' (n: v: nameValuePair "${n}.timer" (timerToUnit n v)) cfg.timers
// mapAttrs' (n: v: nameValuePair "${n}.path" (pathToUnit n v)) cfg.paths
// listToAttrs (map
(v: let n = escapeSystemdPath v.where;
in nameValuePair "${n}.mount" (mountToUnit n v)) cfg.mounts)
// listToAttrs (map
(v: let n = escapeSystemdPath v.where;
in nameValuePair "${n}.automount" (automountToUnit n v)) cfg.automounts);
systemd.user.units =
mapAttrs' (n: v: nameValuePair "${n}.service" (serviceToUnit n v)) cfg.user.services
// mapAttrs' (n: v: nameValuePair "${n}.socket" (socketToUnit n v)) cfg.user.sockets
// mapAttrs' (n: v: nameValuePair "${n}.timer" (timerToUnit n v)) cfg.user.timers;
system.requiredKernelConfig = map config.lib.kernelConfig.isEnabled
[ "DEVTMPFS" "CGROUPS" "INOTIFY_USER" "SIGNALFD" "TIMERFD" "EPOLL" "NET"
"SYSFS" "PROC_FS" "FHANDLE" "DMIID" "AUTOFS4_FS" "TMPFS_POSIX_ACL"
"TMPFS_XATTR" "SECCOMP"
];
users.extraGroups.systemd-journal.gid = config.ids.gids.systemd-journal;
users.extraUsers.systemd-journal-gateway.uid = config.ids.uids.systemd-journal-gateway;
users.extraGroups.systemd-journal-gateway.gid = config.ids.gids.systemd-journal-gateway;
# 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);
# Generate timer units for all services that have a startAt value.
systemd.user.timers =
mapAttrs (name: service:
{ wantedBy = [ "timers.target" ];
timerConfig.OnCalendar = service.startAt;
})
(filterAttrs (name: service: service.startAt != "") cfg.user.services);
systemd.sockets.systemd-journal-gatewayd.wantedBy =
optional config.services.journald.enableHttpGateway "sockets.target";
# Provide the systemd-user PAM service, required to run systemd
# user instances.
security.pam.services.systemd-user =
{ # Ensure that pam_systemd gets included. This is special-cased
# in systemd to provide XDG_RUNTIME_DIR.
startSession = true;
};
# Some overrides to upstream units.
systemd.services."systemd-backlight@".restartIfChanged = false;
systemd.services."systemd-rfkill@".restartIfChanged = false;
systemd.services."user@".restartIfChanged = false;
systemd.services.systemd-journal-flush.restartIfChanged = false;
systemd.services.systemd-random-seed.restartIfChanged = false;
systemd.services.systemd-remount-fs.restartIfChanged = false;
systemd.services.systemd-update-utmp.restartIfChanged = false;
systemd.services.systemd-user-sessions.restartIfChanged = false; # Restart kills all active sessions.
systemd.services.systemd-logind.restartTriggers = [ config.environment.etc."systemd/logind.conf".source ];
systemd.services.systemd-logind.stopIfChanged = false;
systemd.targets.local-fs.unitConfig.X-StopOnReconfiguration = true;
systemd.targets.remote-fs.unitConfig.X-StopOnReconfiguration = true;
systemd.services.systemd-binfmt.wants = [ "proc-sys-fs-binfmt_misc.automount" ];
# Don't bother with certain units in containers.
systemd.services.systemd-remount-fs.unitConfig.ConditionVirtualization = "!container";
systemd.services.systemd-random-seed.unitConfig.ConditionVirtualization = "!container";
};
# FIXME: Remove these eventually.
imports =
[ (mkRenamedOptionModule [ "boot" "systemd" "sockets" ] [ "systemd" "sockets" ])
(mkRenamedOptionModule [ "boot" "systemd" "targets" ] [ "systemd" "targets" ])
(mkRenamedOptionModule [ "boot" "systemd" "services" ] [ "systemd" "services" ])
];
}