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{ config, lib, pkgs, ... }:
with lib;
let cfg = config.services.cloud-init;
path = with pkgs; [ cloud-init nettools utillinux e2fsprogs shadow dmidecode openssh ];
configFile = pkgs.writeText "cloud-init.cfg" ''
users:
- root
disable_root: false
preserve_hostname: false
cloud_init_modules:
- migrator
- seed_random
- bootcmd
- write-files
- growpart
- resizefs
- set_hostname
- update_hostname
- update_etc_hosts
- ca-certs
- rsyslog
- users-groups
cloud_config_modules:
- emit_upstart
- disk_setup
- mounts
- ssh-import-id
- set-passwords
- timezone
- disable-ec2-metadata
- runcmd
- ssh
cloud_final_modules:
- rightscale_userdata
- scripts-vendor
- scripts-per-once
- scripts-per-boot
- scripts-per-instance
- scripts-user
- ssh-authkey-fingerprints
- keys-to-console
- phone-home
- final-message
- power-state-change
'';
in
{
options = {
services.cloud-init = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Enable the cloud-init service. This services reads
configuration metadata in a cloud environment and configures
the machine according to this metadata.
This configuration is not completely compatible with the
NixOS way of doing configuration, as configuration done by
cloud-init might be overriden by a subsequent nixos-rebuild
call. However, some parts of cloud-init fall outside of
NixOS's responsibility, like filesystem resizing and ssh
public key provisioning, and cloud-init is useful for that
parts. Thus, be wary that using cloud-init in NixOS might
come as some cost.
'';
};
};
};
config = mkIf cfg.enable {
systemd.services.cloud-init-local =
{ description = "Initial cloud-init job (pre-networking)";
wantedBy = [ "multi-user.target" ];
wants = [ "local-fs.target" ];
after = [ "local-fs.target" ];
path = path;
serviceConfig =
{ Type = "oneshot";
ExecStart = "${pkgs.cloud-init}/bin/cloud-init -f ${configFile} init --local";
RemainAfterExit = "yes";
TimeoutSec = "0";
StandardOutput = "journal+console";
};
};
systemd.services.cloud-init =
{ description = "Initial cloud-init job (metadata service crawler)";
wantedBy = [ "multi-user.target" ];
wants = [ "local-fs.target" "cloud-init-local.service" "sshd.service" "sshd-keygen.service" ];
after = [ "local-fs.target" "network.target" "cloud-init-local.service" ];
before = [ "sshd.service" "sshd-keygen.service" ];
requires = [ "network.target "];
path = path;
serviceConfig =
{ Type = "oneshot";
ExecStart = "${pkgs.cloud-init}/bin/cloud-init -f ${configFile} init";
RemainAfterExit = "yes";
TimeoutSec = "0";
StandardOutput = "journal+console";
};
};
systemd.services.cloud-config =
{ description = "Apply the settings specified in cloud-config";
wantedBy = [ "multi-user.target" ];
wants = [ "network.target" ];
after = [ "network.target" "syslog.target" "cloud-config.target" ];
path = path;
serviceConfig =
{ Type = "oneshot";
ExecStart = "${pkgs.cloud-init}/bin/cloud-init -f ${configFile} modules --mode=config";
RemainAfterExit = "yes";
TimeoutSec = "0";
StandardOutput = "journal+console";
};
};
systemd.services.cloud-final =
{ description = "Execute cloud user/final scripts";
wantedBy = [ "multi-user.target" ];
wants = [ "network.target" ];
after = [ "network.target" "syslog.target" "cloud-config.service" "rc-local.service" ];
requires = [ "cloud-config.target" ];
path = path;
serviceConfig =
{ Type = "oneshot";
ExecStart = "${pkgs.cloud-init}/bin/cloud-init -f ${configFile} modules --mode=final";
RemainAfterExit = "yes";
TimeoutSec = "0";
StandardOutput = "journal+console";
};
};
systemd.targets.cloud-config =
{ description = "Cloud-config availability";
requires = [ "cloud-init-local.service" "cloud-init.service" ];
};
};
}
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