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# nixos-config - My current NixOS configuration
#
# Copyright (C) 2025 Jörg Thalheim and contributors
# SPDX-License-Identifier: MIT
#
# This file is part of my nixos-config.
#
# You should have received a copy of the License along with this program.
# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
{
lib,
config,
pkgs,
self,
...
}: let
cfg = config.soispha.nixos-shell;
in {
options.soispha.nixos-shell = {
enable = lib.mkEnableOption "nixos-shell";
user_name = lib.mkOption {
type = lib.types.str;
default = "soispha";
description = "The user to auto-login into the vm.";
};
configuration = {
specialArgs = lib.mkOption {
type = lib.types.attrsOf lib.types.anything;
default = {};
description = ''
The arguments to pass to the `specialArgs` attribute set.
'';
};
value = lib.mkOption {
type = lib.types.deferredModule;
default = {};
description = ''
Additional NixOS configuration to load into the VM's config.
'';
};
};
mounts = lib.mkOption {
type = lib.types.attrsOf (lib.types.submodule ({config, ...}: {
options = {
target = lib.mkOption {
type = lib.types.path;
description = "Target on the guest.";
};
cache_mode = lib.mkOption {
type = lib.types.enum ["none" "loose" "fscache" "mmap"];
default = "loose"; # bad idea? Well, at least it is fast!1!!
description = "9p caching policy";
};
readOnly =
(lib.mkEnableOption "mount this disk in read-only mode")
// {
default = true;
};
tag = lib.mkOption {
type = lib.types.str;
internal = true;
};
};
config.tag = lib.mkDefault (
builtins.substring 0 31 ( # tags must be shorter than 32 bytes
"a"
+ # tags must not begin with a digit
builtins.hashString "md5" config._module.args.name
)
);
}));
default = {};
description = ''
Extra paths to make available in the vm.
These will be mounted ro to their `target.`
'';
};
};
config = let
vmSystem = self.inputs.nixpkgs.lib.nixosSystem {
inherit (cfg.configuration) specialArgs;
modules = [
{
# TODO(@bpeetz): This should be bumped each release. <2025-05-17>
system.stateVersion = "25.05";
}
cfg.configuration.value
(import ./shell_setup.nix {inherit cfg;})
];
};
nixos-shell = pkgs.writeShellApplication {
name = "nixos-shell";
text = builtins.readFile ./nixos-shell.sh;
# We need to keep the PATH, as we otherwise can't pass it along.
inheritPath = true;
runtimeInputs = [
vmSystem.config.system.build.vm
pkgs.mktemp
pkgs.coreutils
pkgs.moreutils # for sponge
];
runtimeEnv = {
HOST_NAME = vmSystem.config.system.name;
};
};
in
lib.mkIf cfg.enable {
environment.systemPackages = [
nixos-shell
];
system.build.nixos-shell = vmSystem.config.system.build.vm;
};
}
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