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nixpkgs/nixos/modules/service-managers/docker.nix

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Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.docker-containers;
containerModule = {
script = mkOption {
type = types.lines;
description = "Shell commands executed as the service's main process.";
};
};
toContainer = name: value: pkgs.dockerTools.buildImage {
inherit name;
config = {
Cmd = [ value.script ];
};
};
in {
options.docker-containers = mkOption {
default = {};
type = with types; attrsOf (types.submodule containerModule);
description = "Definition of docker containers";
};
config.system.build.toplevel-docker = lib.mapAttrs toContainer cfg;
}