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# generate the script used to activate the configuration.
{ config, pkgs, ... }:
with pkgs.lib;
let
addAttributeName = mapAttrs (a: v: v // {
text = ''
#### Activation script snippet ${a}:
${v.text}
'';
});
path =
[ pkgs.coreutils pkgs.gnugrep pkgs.findutils
pkgs.glibc # needed for getent
pkgs.shadow
pkgs.nettools # needed for hostname
];
in
{
###### interface
options = {
system.activationScripts = mkOption {
default = {};
example = {
stdio = {
text = ''
# Needed by some programs.
ln -sfn /proc/self/fd /dev/fd
ln -sfn /proc/self/fd/0 /dev/stdin
ln -sfn /proc/self/fd/1 /dev/stdout
ln -sfn /proc/self/fd/2 /dev/stderr
'';
deps = [];
};
};
description = ''
Activate the new configuration (i.e., update /etc, make accounts,
and so on).
'';
merge = mergeTypedOption "script" builtins.isAttrs (fold mergeAttrs {});
apply = set: {
script =
''
#! ${pkgs.stdenv.shell}
systemConfig=@out@
export PATH=/empty
for i in ${toString path}; do
PATH=$PATH:$i/bin:$i/sbin
done
# Ensure a consistent umask.
umask 0022
${
let
set' = mapAttrs (n: v: if builtins.isString v then noDepEntry v else v) set;
withHeadlines = addAttributeName set';
in textClosureMap id (withHeadlines) (attrNames withHeadlines)
}
# Make this configuration the current configuration.
# The readlink is there to ensure that when $systemConfig = /system
# (which is a symlink to the store), /run/current-system is still
# used as a garbage collection root.
ln -sfn "$(readlink -f "$systemConfig")" /run/current-system
# Prevent the current configuration from being garbage-collected.
ln -sfn /run/current-system /nix/var/nix/gcroots/current-system
'';
};
};
};
###### implementation
config = {
system.activationScripts.stdio =
''
# Needed by some programs.
ln -sfn /proc/self/fd /dev/fd
ln -sfn /proc/self/fd/0 /dev/stdin
ln -sfn /proc/self/fd/1 /dev/stdout
ln -sfn /proc/self/fd/2 /dev/stderr
'';
system.activationScripts.var =
''
# Various log/runtime directories.
touch /var/run/utmp # must exist
chgrp ${toString config.ids.gids.utmp} /var/run/utmp
chmod 664 /var/run/utmp
mkdir -m 0755 -p /var/run/nix/current-load # for distributed builds
mkdir -m 0700 -p /var/run/nix/remote-stores
# Directory holding symlinks to currently running Upstart
# jobs. Used to determine which jobs need to be restarted
# when switching to a new configuration.
mkdir -m 0700 -p /var/run/upstart-jobs
mkdir -m 0755 -p /var/log
touch /var/log/wtmp # must exist
chmod 644 /var/log/wtmp
touch /var/log/lastlog
chmod 644 /var/log/lastlog
mkdir -m 1777 -p /var/tmp
# Empty, read-only home directory of many system accounts.
mkdir -m 0555 -p /var/empty
'';
system.activationScripts.media =
''
mkdir -m 0755 -p /media
'';
system.activationScripts.usrbinenv =
''
mkdir -m 0755 -p /usr/bin
ln -sfn ${pkgs.coreutils}/bin/env /usr/bin/.env.tmp
mv /usr/bin/.env.tmp /usr/bin/env # atomically replace /usr/bin/env
'';
system.activationScripts.tmpfs =
''
${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.devSize}" none /dev
${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.devShmSize}" none /dev/shm
${pkgs.utillinux}/bin/mount -o "remount,size=${config.boot.runSize}" none /run
'';
};
}
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