haccfiles/modules/containers.nix

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{ config, lib, pkgs, modules, profiles, sources, nixosSystem, ... }:
let
mkIPv4 = index: local:
"192.168.${if local then "100" else "101"}.${toString index}";
mkIPv6 = index: local:
"fd00::${if local then "100" else "101"}:${toString index}";
evalConfig = nixosConfig: (nixosSystem {
inherit (config.nixpkgs) system;
modules = [
nixosConfig
modules.nopersist
profiles.container
{ nixpkgs.pkgs = lib.mkForce pkgs; }
];
specialArgs = {
inherit modules sources;
};
}).config.system.build.toplevel;
in {
options.hacc.containers = with lib.options;
mkOption {
description = ''
hacc-specific containers. These are a thin wrapper around "normal" nixos containers:
- they automatically get an IPv4/IPv6 address assigned
(note that these are not guaranteed to be stable across config changes,
so please use {option}`containers.<name>.hostAddress` & friends to
reference them elsewhere)
- they set a couple default options (e.g. ephemeral, autoStart, privateNetwork)
- they are evaluated with our own version of {nix}`evalConfig`, which includes a
couple more modules by default, use our version of `nixpkgs`, and includes the
{nix}`profiles.containers` profile setting sane defaults for containers.
'';
default = { };
type = with lib.types;
types.attrsOf (types.submodule {
options = {
bindToPersist = mkOption {
default = true;
type = types.bool;
description =
"Wether to mount /persist/containers/<name> at /persist into this container.";
};
bindSecrets = mkOption {
default = false;
type = types.bool;
description =
"Whether to mount /run/secrets/<name> at /secrets into this container.";
};
config = mkOption {
type = types.unspecified;
description =
"The container's config, to be evaluated with our own {nix}`evalConfig`.";
};
};
});
};
# wrapped into imap1, which enumerates the containers; IP addresses are then
# simply assigned based on the order the containers are in the list.
config.containers = lib.mkMerge (lib.imap1
(index: { name, value }: let container = value; in {
${name} = {
hostAddress = mkIPv4 index false;
localAddress = mkIPv4 index true;
hostAddress6 = mkIPv6 index false;
localAddress6 = mkIPv6 index true;
privateNetwork = true;
autoStart = true;
ephemeral = true;
bindMounts = lib.mkMerge [
(lib.mkIf container.bindToPersist {
"/persist" = {
hostPath = "/persist/containers/${name}";
isReadOnly = false;
};
})
(lib.mkIf container.bindSecrets {
"/secrets" = {
hostPath = "/run/secrets/${name}";
isReadOnly = true;
};
})
];
path = evalConfig container.config;
};
}) (lib.attrsToList config.hacc.containers));
}