nixpkgs/modules/system/boot/systemd.nix
Eelco Dolstra 42ee3b4209 Add a ‘wantedBy’ attribute to unit definitions
This attribute allows a unit to make itself a dependency of another unit.

Also, add an option to set the default target unit.
2012-06-17 23:31:21 -04:00

270 lines
6.8 KiB
Nix

{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.boot.systemd;
systemd = pkgs.systemd;
makeUnit = name: unit:
pkgs.writeTextFile { name = "unit"; inherit (unit) text; destination = "/${name}"; };
upstreamUnits =
[ # Targets.
"basic.target"
"sysinit.target"
"sockets.target"
"graphical.target"
"multi-user.target"
"getty.target"
"rescue.target"
"network.target"
"nss-lookup.target"
"nss-user-lookup.target"
"syslog.target"
"time-sync.target"
# Udev.
"systemd-udev-control.socket"
"systemd-udev-kernel.socket"
"systemd-udev.service"
"systemd-udev-settle.service"
"systemd-udev-trigger.service"
# Login stuff.
"systemd-logind.service"
"autovt@.service"
"systemd-vconsole-setup.service"
"systemd-user-sessions.service"
"dbus-org.freedesktop.login1.service"
"user@.service"
# Journal.
"systemd-journald.socket"
"systemd-journald.service"
# SysV init compatibility.
"systemd-initctl.socket"
"systemd-initctl.service"
"runlevel0.target"
"runlevel1.target"
"runlevel2.target"
"runlevel3.target"
"runlevel4.target"
"runlevel5.target"
"runlevel6.target"
# Random seed.
"systemd-random-seed-load.service"
"systemd-random-seed-save.service"
# Utmp maintenance.
"systemd-update-utmp-runlevel.service"
"systemd-update-utmp-shutdown.service"
# Filesystems.
"fsck@.service"
"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"
"sys-fs-fuse-connections.mount"
"sys-kernel-config.mount"
"sys-kernel-debug.mount"
# Hibernate / suspend.
"hibernate.target"
"hibernate.service"
"suspend.target"
"suspend.service"
"sleep.target"
# Reboot stuff.
"reboot.target"
"reboot.service"
"poweroff.target"
"poweroff.service"
"halt.target"
"halt.service"
"ctrl-alt-del.target"
"shutdown.target"
"umount.target"
"final.target"
# Misc.
"syslog.socket"
];
upstreamWants =
[ "basic.target.wants"
"sysinit.target.wants"
"sockets.target.wants"
"local-fs.target.wants"
"multi-user.target.wants"
"shutdown.target.wants"
];
nixosUnits = mapAttrsToList makeUnit cfg.units;
units = pkgs.runCommand "units" { preferLocalBuild = true; }
''
mkdir -p $out/system
for i in ${toString upstreamUnits}; do
fn=${systemd}/example/systemd/system/$i
[ -e $fn ]
if [ -L $fn ]; then
cp -pd $fn $out/system/
else
ln -s $fn $out/system
fi
done
for i in ${toString upstreamWants}; do
fn=${systemd}/example/systemd/system/$i
[ -e $fn ]
x=$out/system/$(basename $fn)
mkdir $x
for i in $fn/*; do
y=$x/$(basename $i)
cp -pd $i $y
if ! [ -e $y ]; then rm -v $y; fi
done
done
for i in ${toString nixosUnits}; do
cp $i/* $out/system
done
${concatStrings (mapAttrsToList (name: unit:
concatMapStrings (name2: ''
mkdir -p $out/system/${name2}.wants
ln -sfn ../${name} $out/system/${name2}.wants/
'') unit.wantedBy) cfg.units)}
ln -s ${cfg.defaultUnit} $out/system/default.target
''; # */
in
{
###### interface
options = {
boot.systemd.units = mkOption {
default = {};
type = types.attrsOf types.optionSet;
options = {
text = mkOption {
types = types.uniq types.string;
description = "Text of this systemd unit.";
};
wantedBy = mkOption {
default = [];
types = types.listOf types.string;
description = "Units that want (i.e. depend on) this unit.";
};
};
description = "Definition of systemd units.";
};
boot.systemd.defaultUnit = mkOption {
default = "multi-user.target";
type = types.uniq types.string;
description = "Default unit started when the system boots.";
};
};
###### implementation
config = {
system.build.systemd = systemd;
system.build.units = units;
environment.systemPackages = [ systemd ];
environment.etc =
[ { source = units;
target = "systemd";
}
];
boot.systemd.units."getty@.service".text =
''
[Unit]
Description=Getty on %I
Documentation=man:agetty(8)
After=systemd-user-sessions.service plymouth-quit-wait.service
# If additional gettys are spawned during boot then we should make
# sure that this is synchronized before getty.target, even though
# getty.target didn't actually pull it in.
Before=getty.target
IgnoreOnIsolate=yes
[Service]
Environment=TERM=linux
ExecStart=-${pkgs.utillinux}/sbin/agetty --noclear --login-program ${pkgs.shadow}/bin/login %I 38400
Type=idle
Restart=always
RestartSec=0
UtmpIdentifier=%I
TTYPath=/dev/%I
TTYReset=yes
TTYVHangup=yes
TTYVTDisallocate=yes
KillMode=process
IgnoreSIGPIPE=no
# Unset locale for the console getty since the console has problems
# displaying some internationalized messages.
Environment=LANG= LANGUAGE= LC_CTYPE= LC_NUMERIC= LC_TIME= LC_COLLATE= LC_MONETARY= LC_MESSAGES= LC_PAPER= LC_NAME= LC_ADDRESS= LC_TELEPHONE= LC_MEASUREMENT= LC_IDENTIFICATION=
# Some login implementations ignore SIGTERM, so we send SIGHUP
# instead, to ensure that login terminates cleanly.
KillSignal=SIGHUP
'';
boot.systemd.units."rescue.service".text =
''
[Unit]
Description=Rescue Shell
DefaultDependencies=no
Conflicts=shutdown.target
After=sysinit.target
Before=shutdown.target
[Service]
Environment=HOME=/root
WorkingDirectory=/root
ExecStartPre=-${pkgs.coreutils}/bin/echo 'Welcome to rescue mode. Use "systemctl default" or ^D to enter default mode.'
#ExecStart=-/sbin/sulogin
ExecStart=-${pkgs.bashInteractive}/bin/bash --login
ExecStopPost=-${systemd}/bin/systemctl --fail --no-block default
Type=idle
StandardInput=tty-force
StandardOutput=inherit
StandardError=inherit
KillMode=process
# Bash ignores SIGTERM, so we send SIGHUP instead, to ensure that bash
# terminates cleanly.
KillSignal=SIGHUP
'';
};
}