nixos-configuration/digital-ocean/default.nix

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{ pkgs, stateVersion }:
let
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module = { config, modulesPath, lib, ... }:
let
cfg = config.virtualisation.digitalOceanImage;
in
{
# This import must exist for all configurations to take effect the first
# time launching a droplet. Refer to `config.system.build.toplevel` in
# `make-disk-image.nix`.
imports = [ ./configuration.nix ];
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options = {
virtualisation.digitalOceanImage.diskSize = lib.mkOption {
type = with lib.types; either (enum [ "auto" ]) int;
default = "auto";
example = 4096;
description = lib.mdDoc ''
Size of disk image. Unit is MB.
'';
};
virtualisation.digitalOceanImage.configFile = lib.mkOption {
type = with lib.types; nullOr path;
default = null;
description = lib.mdDoc ''
A path to a configuration file which will be placed at
`/etc/nixos/configuration.nix` and be used when switching
to a new configuration. If set to `null`, a default
configuration is used that imports
`(modulesPath + "/virtualisation/digital-ocean-config.nix")`.
'';
};
virtualisation.digitalOceanImage.compressionMethod = lib.mkOption {
type = lib.types.enum [ "gzip" "bzip2" ];
default = "gzip";
example = "bzip2";
description = lib.mdDoc ''
Disk image compression method. Choose bzip2 to generate smaller
images that take longer to generate but will consume less metered
storage space on your Digital Ocean account.
'';
};
};
config = {
system.build.digitalOceanImage = lib.mkForce (
import ./make-disk-image.nix {
name = "digital-ocean-image";
format = "qcow2";
postVM = let
compress = {
"gzip" = "${pkgs.gzip}/bin/gzip";
"bzip2" = "${pkgs.bzip2}/bin/bzip2";
}.${cfg.compressionMethod};
in ''
${compress} $diskImage
'';
configFile = ./configuration.nix;
swapSize = 1024;
inherit (cfg) diskSize;
inherit config lib pkgs;
}
);
system.stateVersion = stateVersion;
};
};
in
(pkgs.nixos module).digitalOceanImage