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|
{ nixpkgsPath ? <nixpkgs>
, dockerConfig
, nixConfig
, name
, tag ? ""
, ...}:
let
pkgs = import nixpkgsPath {};
dummyOption = with pkgs.lib; mkOption {
type = types.attrs;
default = {};
};
systemModule = { lib, config, ... }: {
options = {
toplevel = lib.mkOption {
type = lib.types.str;
};
systemd = with lib; {
services = dummyOption;
targets = dummyOption;
timers = dummyOption;
};
environment = dummyOption;
users.users = dummyOption;
users.groups = dummyOption;
meta = dummyOption;
networking.enableIPv6 = lib.mkOption {
type = lib.types.bool;
default = false;
};
};
config._module.args.pkgs = pkgs;
};
config = pkgs.lib.evalModules {
modules = [
systemModule
nixConfig
"${nixpkgsPath}/nixos/modules/misc/assertions.nix"
];
};
in pkgs.dockerTools.buildImage {
inherit name tag;
# coreutils are included since we need them in startup scripts
contents = pkgs.coreutils;
# create home directories of users (some services create
# their state paths using this, so even without having
# users it's important)
runAsRoot = (with pkgs.lib;
strings.concatStrings
(mapAttrsToList
(n: u: if u ? createHome && u.createHome then ("mkdir -p ${u.home}\n") else "")
config.config.users.users));
# this maps all defined systemd services to simple shell
# scripts that are started when the docker container runs.
# Note that many features of the systemd.services config
# are just ignored (e.g. no auto-restarts yet)
config = with pkgs.lib; with pkgs.lib.strings; dockerConfig // {
Cmd = [ (pkgs.writeScript "main-entrypoint"
("#!${pkgs.dash.outPath}/bin/dash\n" + concatStrings
(map (command: "${command}&\n")
(mapAttrsToList
(name: service:
(pkgs.writeScript "systemd-script-${name}"
''
#!${pkgs.dash.outPath}/bin/dash
set -xue
# set up working directory
${optionalString (service ? serviceConfig
&& service.serviceConfig ? WorkingDirectory) ''
mkdir -p ${service.serviceConfig.WorkingDirectory}
cd ${service.serviceConfig.WorkingDirectory} ''}
# run the prestart script
${optionalString (service ? preStart) ''
echo ${escapeShellArg name}: running preStart script
${service.preStart}''}
echo ${name}: starting ...
# set up environment variables
${optionalString (service ? environment)
(concatStrings
(mapAttrsToList
(n: k: "export ${n}=${escapeShellArg k}\n")
service.environment))}
# start the service
${if service ? script
then service.script
else service.serviceConfig.ExecStart}
'').outPath)
config.config.systemd.services)) + "\n wait")) ];
};
}
|
