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# Welcome to the top-level default.nix of stockholm.
#
# You can discover the whole thing easily using the `get` utility,
# which can be found at http://cgit.cd.krebsco.de/get/tree/get
# To install `get` on any Nix-enabled system, use:
#
# nix-env -f /path/to/stockholm -iA pkgs.get
#
# The "current" arguments are used to provide information about the user who's
# evaluating this file. This information is used to determine which user
# namespace is to be used. Of course there's nothing trying to prevent you
# from forging this information. E.g. you could try to generate the deployment
# script for some random user's system, targeting some random host:
#
# LOGNAME=tv get krebs.deploy system=nomic target=8.8.8.8
#
{ current-date ? abort "current-date not defined"
, current-host-name ? abort "current-host-name not defined"
, current-user-name ? builtins.getEnv "LOGNAME"
}@current:
let out = {
# The generated scripts to deploy (or infest) systems can be found in the
# `krebs` attribute. There's also an init script, but it's in its early
# stages, not well integrated and mostly useless at the moment. :)
#
# You'll also find lib here, which is nixpkgs/lib + krebs lib, but nobody
# is really accessing this directly, as this lib gets reexported below.
inherit krebs;
# All systems of all users can be found here.
#
# /!\ Please note that `get users.${user-name}.${host-name}.system` is a
# bad idea because it will produce vast amounts of output. These are the
# actual and complete system derivations that can be installed on the
# respective host.
#
# Another thing to notice here is that other user's systems might not be
# evaluable because of missing secrets. If you _are_ able to evaluate
# another user's system, then you probably share a similar naming scheme
# for your secret files! :)
inherit users;
# Additionally, output lib and pkgs for easy access from the shell.
# Notice how we're evaluating just the base module to obtain pkgs.
inherit lib;
inherit (eval {}) pkgs;
};
krebs = import ./krebs (current // { stockholm = out; });
inherit (krebs) lib;
# Path resolvers for common and individual files.
# Example: `upath "3modules"` produces the current user's 3modules directory
kpath = lib.nspath "krebs";
upath = lib.nspath current-user-name;
# This is the base module. Its purpose is to provide modules and
# packages, both common ones, found in krebs/ as well as the current user's,
# found in the user's namespace.
base-module = {
imports = map (f: f "3modules") [ kpath upath ];
nixpkgs.config.packageOverrides = pkgs:
let
# Notice the ordering. Krebs packages can only depend on Nixpkgs,
# whereas user packages additionally can depend on krebs packages.
kpkgs = import (kpath "5pkgs") { inherit pkgs; };
upkgs = import (upath "5pkgs") { pkgs = pkgs // kpkgs; };
in
kpkgs // upkgs;
};
# The above base module is used together with a NixOS configuration to
# produce a system. Notice how stockholm really just provides additional
# packages and modules on top of NixOS. Some of this stuff might become
# useful to a broader audience, at which point it should probably be merged
# and pull-requested for inclusion into NixOS/nixpkgs.
# TODO provide krebs lib, so modules don't have to import it awkwardly
eval = config: import <nixpkgs/nixos/lib/eval-config.nix> {
modules = [
base-module
config
];
};
# Any top-level directory other than krebs/ is considered to be a user
# namespace, configuring a bunch of systems.
# Have a look at the definition of install in krebs/default.nix to see how
# nix-env is using this attribute set to obtain the system to be installed.
# TODO move user namespaces' to users/, so no exception for krebs/ is needed
users =
lib.mapAttrs
(name: _: eval-all-systems (lib.nspath name "1systems"))
(lib.filterAttrs
(n: t: !lib.hasPrefix "." n && t == "directory" && n != "krebs")
(builtins.readDir ./.));
# Given a path to a user namespace, provide an attribute of evaluated
# system configurations, keyed by system names (AKA host names).
eval-all-systems = path:
lib.mapAttrs'
(n: _: (lib.nameValuePair (lib.removeSuffix ".nix" n)
(eval-system (path + "/${n}"))))
(builtins.readDir path);
eval-system = path: rec {
inherit (eval path) config options;
system = config.system.build.toplevel;
};
in out
|
