66967ec752
machinectl compliant NixOS installation
236 lines
6.4 KiB
Nix
236 lines
6.4 KiB
Nix
# generate the script used to activate the configuration.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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addAttributeName = mapAttrs (a: v: v // {
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text = ''
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#### Activation script snippet ${a}:
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_localstatus=0
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${v.text}
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if (( _localstatus > 0 )); then
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printf "Activation script snippet '%s' failed (%s)\n" "${a}" "$_localstatus"
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fi
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'';
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});
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path = with pkgs; map getBin
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[ coreutils
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gnugrep
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findutils
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getent
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stdenv.cc.libc # nscd in update-users-groups.pl
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shadow
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nettools # needed for hostname
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utillinux # needed for mount and mountpoint
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];
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in
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{
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###### interface
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options = {
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system.activationScripts = mkOption {
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default = {};
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example = literalExample ''
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{ stdio = {
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text = '''
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# Needed by some programs.
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ln -sfn /proc/self/fd /dev/fd
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ln -sfn /proc/self/fd/0 /dev/stdin
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ln -sfn /proc/self/fd/1 /dev/stdout
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ln -sfn /proc/self/fd/2 /dev/stderr
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''';
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deps = [];
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};
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}
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'';
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description = ''
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A set of shell script fragments that are executed when a NixOS
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system configuration is activated. Examples are updating
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/etc, creating accounts, and so on. Since these are executed
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every time you boot the system or run
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<command>nixos-rebuild</command>, it's important that they are
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idempotent and fast.
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'';
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type = types.attrsOf types.unspecified; # FIXME
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apply = set: {
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script =
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''
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#! ${pkgs.runtimeShell}
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systemConfig=@out@
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export PATH=/empty
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for i in ${toString path}; do
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PATH=$PATH:$i/bin:$i/sbin
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done
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_status=0
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trap "_status=1 _localstatus=\$?" ERR
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# Ensure a consistent umask.
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umask 0022
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${
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let
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set' = mapAttrs (n: v: if isString v then noDepEntry v else v) set;
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withHeadlines = addAttributeName set';
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in textClosureMap id (withHeadlines) (attrNames withHeadlines)
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}
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# Make this configuration the current configuration.
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# The readlink is there to ensure that when $systemConfig = /system
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# (which is a symlink to the store), /run/current-system is still
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# used as a garbage collection root.
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ln -sfn "$(readlink -f "$systemConfig")" /run/current-system
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# Prevent the current configuration from being garbage-collected.
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ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
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exit $_status
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'';
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};
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};
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system.userActivationScripts = mkOption {
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default = {};
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example = literalExample ''
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{ plasmaSetup = {
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text = '''
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${pkgs.libsForQt5.kservice}/bin/kbuildsycoca5"
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''';
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deps = [];
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};
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}
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'';
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description = ''
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A set of shell script fragments that are executed by a systemd user
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service when a NixOS system configuration is activated. Examples are
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rebuilding the .desktop file cache for showing applications in the menu.
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Since these are executed every time you run
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<command>nixos-rebuild</command>, it's important that they are
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idempotent and fast.
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'';
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type = types.attrsOf types.unspecified;
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apply = set: {
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script = ''
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unset PATH
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for i in ${toString path}; do
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PATH=$PATH:$i/bin:$i/sbin
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done
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_status=0
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trap "_status=1 _localstatus=\$?" ERR
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${
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let
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set' = mapAttrs (n: v: if isString v then noDepEntry v else v) set;
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withHeadlines = addAttributeName set';
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in textClosureMap id (withHeadlines) (attrNames withHeadlines)
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}
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exit $_status
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'';
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};
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};
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environment.usrbinenv = mkOption {
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default = "${pkgs.coreutils}/bin/env";
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example = literalExample ''
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"''${pkgs.busybox}/bin/env"
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'';
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type = types.nullOr types.path;
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visible = false;
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description = ''
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The env(1) executable that is linked system-wide to
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<literal>/usr/bin/env</literal>.
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'';
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};
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};
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###### implementation
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config = {
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system.activationScripts.stdio = ""; # obsolete
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system.activationScripts.var =
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''
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# Various log/runtime directories.
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mkdir -m 1777 -p /var/tmp
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# Empty, immutable home directory of many system accounts.
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mkdir -p /var/empty
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# Make sure it's really empty
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${pkgs.e2fsprogs}/bin/chattr -f -i /var/empty || true
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find /var/empty -mindepth 1 -delete
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chmod 0555 /var/empty
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chown root:root /var/empty
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${ # reasons for not setting immutable flag:
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# 1. flag is not changeable inside a container
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# 2. systemd-nspawn can not perform chown in case of --private-users-chown
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# then the owner is nobody and ssh will not start
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optionalString (!config.boot.isContainer) ''
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${pkgs.e2fsprogs}/bin/chattr -f +i /var/empty || true
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''}
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'';
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system.activationScripts.usrbinenv = if config.environment.usrbinenv != null
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then ''
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mkdir -m 0755 -p /usr/bin
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ln -sfn ${config.environment.usrbinenv} /usr/bin/.env.tmp
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mv /usr/bin/.env.tmp /usr/bin/env # atomically replace /usr/bin/env
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''
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else ''
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rm -f /usr/bin/env
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rmdir --ignore-fail-on-non-empty /usr/bin /usr
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'';
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system.activationScripts.specialfs =
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''
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specialMount() {
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local device="$1"
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local mountPoint="$2"
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local options="$3"
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local fsType="$4"
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if mountpoint -q "$mountPoint"; then
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local options="remount,$options"
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else
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mkdir -m 0755 -p "$mountPoint"
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fi
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mount -t "$fsType" -o "$options" "$device" "$mountPoint"
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}
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source ${config.system.build.earlyMountScript}
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'';
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systemd.user = {
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services.nixos-activation = {
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description = "Run user-specific NixOS activation";
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script = config.system.userActivationScripts.script;
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unitConfig.ConditionUser = "!@system";
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serviceConfig.Type = "oneshot";
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};
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};
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};
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}
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