202: iso: avoid systemd service startup r=nrdxp a=blaggacao

fixes #194
alternative to #197

# Manual Tests


<details>
<summary>was unrelated</summary>

- [ ] `flk install NixOS --impure` correctly onto `/mnt`  (looks like no profile is present)

Issue: https://github.com/divnix/devos/issues/204
Upstream Issue: https://github.com/NixOS/nixpkgs/issues/116938

</details>

- [x] acceptable build time / closure size ca 850MB (for a simple base OS) ✔️ 
- [x] local profile with `cage` service is disabled, that is: boots into terminal ✔️ 
- [x] success: air gapped / offline devshell enter ✔️ 
- [ ] failure: aire gapped target install: &larr; non blocking bonus item  
```console
$ flk install POS
warning: you don't have internet access; disabling some network-dependent features
building the flake in path:/iso/devos?narHash=sha265-...
warning: you don't have internet access; disabling some network-dependent features
error: unable to download 'https://api.github.com/repos/NixOS/nixpkgs/df8e3...': Couldn't resolve host name (6)
```

&rarr; detailed rationale in the commit messages

❤️ @Pacman99 for the excellent and detailed discussions in #197 and the may ideas, suggestions and code.

Co-authored-by: David Arnold <dar@xoe.solutions>
This commit is contained in:
bors[bot] 2021-03-22 21:59:12 +00:00 committed by GitHub
commit 870897a3e9
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 5 deletions

View file

@ -6,27 +6,42 @@ lib.nixosSystem (args // {
let let
moduleList = builtins.attrValues modules; moduleList = builtins.attrValues modules;
modpath = "nixos/modules"; modpath = "nixos/modules";
cd = "installer/cd-dvd/installation-cd-minimal-new-kernel.nix";
fullHostConfig = (lib.nixosSystem (args // { modules = moduleList; })).config;
isoConfig = (lib.nixosSystem isoConfig = (lib.nixosSystem
(args // { (args // {
modules = moduleList ++ [ modules = moduleList ++ [
"${nixos}/${modpath}/${cd}"
({ config, ... }: { "${nixos}/${modpath}/installer/cd-dvd/installation-cd-minimal-new-kernel.nix"
({ config, suites, ... }: {
# avoid unwanted systemd service startups
disabledModules = lib.remove modules.core suites.allProfiles;
nix.registry = lib.mapAttrs (n: v: { flake = v; }) inputs;
isoImage.isoBaseName = "nixos-" + config.networking.hostName; isoImage.isoBaseName = "nixos-" + config.networking.hostName;
isoImage.contents = [{ isoImage.contents = [{
source = self; source = self;
target = "/devos/"; target = "/devos/";
}]; }];
nix.registry = lib.mapAttrs (n: v: { flake = v; }) inputs;
isoImage.storeContents = [ isoImage.storeContents = [
self.devShell.${config.nixpkgs.system} self.devShell.${config.nixpkgs.system}
# include also closures that are "switched off" by the
# above profile filter on the local config attribute
fullHostConfig.system.build.toplevel
]; ];
# still pull in tools of deactivated profiles
environment.systemPackages = fullHostConfig.environment.systemPackages;
# confilcts with networking.wireless which might be slightly # confilcts with networking.wireless which might be slightly
# more useful on a stick # more useful on a stick
networking.networkmanager.enable = lib.mkForce false; networking.networkmanager.enable = lib.mkForce false;
# confilcts with networking.wireless # confilcts with networking.wireless
networking.wireless.iwd.enable = lib.mkForce false; networking.wireless.iwd.enable = lib.mkForce false;
# Set up a link-local boostrap network # Set up a link-local boostrap network
# See also: https://github.com/NixOS/nixpkgs/issues/75515#issuecomment-571661659 # See also: https://github.com/NixOS/nixpkgs/issues/75515#issuecomment-571661659
networking.usePredictableInterfaceNames = lib.mkForce true; # so prefix matching works networking.usePredictableInterfaceNames = lib.mkForce true; # so prefix matching works

View file

@ -27,7 +27,7 @@ let mkProfileAttrs =
f = n: _: f = n: _:
lib.optionalAttrs lib.optionalAttrs
(lib.pathExists "${dir}/${n}/default.nix") (lib.pathExists "${dir}/${n}/default.nix")
{ default = "${dir}/${n}"; } { default = /. + "${dir}/${n}"; }
// mkProfileAttrs "${dir}/${n}"; // mkProfileAttrs "${dir}/${n}";
in in
lib.mapAttrs f imports; lib.mapAttrs f imports;