nixpkgs/system/activate-configuration.nix

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# generate the script used to activate the configuration.
{pkgs, config, ...}:
let
inherit (pkgs.stringsWithDeps) textClosureOverridable;
inherit (pkgs.lib) mkOption mergeTypedOption mergeAttrs mapRecordFlatten id;
textClosure = steps:
textClosureOverridable steps
(["#!/bin/sh"] ++ (mapRecordFlatten (a: v: v) steps));
aggregateScripts = name: steps:
pkgs.writeScript name (textClosure steps);
in
{
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 mergeAttrs;
apply = lib: {
inherit lib; # used to fetch dependencies.
script = aggregateScripts "activationScript" lib;
};
};
};
}