151 lines
3.9 KiB
Nix
151 lines
3.9 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 ${a}:
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${v.text}
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'';
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});
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path =
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[ pkgs.coreutils pkgs.gnugrep pkgs.findutils
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pkgs.glibc # needed for getent
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pkgs.shadow
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pkgs.nettools # needed for hostname
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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 = {
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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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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.stdenv.shell}
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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" 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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};
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###### implementation
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config = {
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system.activationScripts.stdio =
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''
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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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system.activationScripts.var =
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''
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# Various log/runtime directories.
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touch /run/utmp # must exist
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chgrp ${toString config.ids.gids.utmp} /run/utmp
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chmod 664 /run/utmp
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mkdir -m 0755 -p /run/nix/current-load # for distributed builds
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mkdir -m 0700 -p /run/nix/remote-stores
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mkdir -m 0755 -p /var/log
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touch /var/log/wtmp /var/log/lastlog # must exist
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chmod 644 /var/log/wtmp /var/log/lastlog
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mkdir -m 1777 -p /var/tmp
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# Empty, read-only home directory of many system accounts.
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mkdir -m 0555 -p /var/empty
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'';
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system.activationScripts.usrbinenv =
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''
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mkdir -m 0755 -p /usr/bin
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ln -sfn ${pkgs.coreutils}/bin/env /usr/bin/.env.tmp
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mv /usr/bin/.env.tmp /usr/bin/env # atomically replace /usr/bin/env
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'';
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system.activationScripts.tmpfs =
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''
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${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.devSize}" none /dev
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${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.devShmSize}" none /dev/shm
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${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.runSize}" none /run
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'';
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};
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}
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