79 lines
2.7 KiB
Nix
79 lines
2.7 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.amazon-ssm-agent;
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# The SSM agent doesn't pay attention to our /etc/os-release yet, and the lsb-release tool
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# in nixpkgs doesn't seem to work properly on NixOS, so let's just fake the two fields SSM
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# looks for. See https://github.com/aws/amazon-ssm-agent/issues/38 for upstream fix.
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fake-lsb-release = pkgs.writeScriptBin "lsb_release" ''
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#!${pkgs.runtimeShell}
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case "$1" in
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-i) echo "nixos";;
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-r) echo "${config.system.nixos.version}";;
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esac
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'';
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sudoRule = {
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users = [ "ssm-user" ];
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commands = [ { command = "ALL"; options = [ "NOPASSWD" ]; } ];
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};
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in {
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imports = [
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(mkRenamedOptionModule [ "services" "ssm-agent" "enable" ] [ "services" "amazon-ssm-agent" "enable" ])
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(mkRenamedOptionModule [ "services" "ssm-agent" "package" ] [ "services" "amazon-ssm-agent" "package" ])
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];
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options.services.amazon-ssm-agent = {
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enable = mkEnableOption "Amazon SSM agent";
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package = mkOption {
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type = types.path;
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description = "The Amazon SSM agent package to use";
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default = pkgs.amazon-ssm-agent.override { overrideEtc = false; };
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defaultText = literalExpression "pkgs.amazon-ssm-agent.override { overrideEtc = false; }";
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};
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};
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config = mkIf cfg.enable {
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# See https://github.com/aws/amazon-ssm-agent/blob/mainline/packaging/linux/amazon-ssm-agent.service
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systemd.services.amazon-ssm-agent = {
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inherit (cfg.package.meta) description;
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wants = [ "network-online.target" ];
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after = [ "network-online.target" ];
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wantedBy = [ "multi-user.target" ];
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path = [ fake-lsb-release pkgs.coreutils ];
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serviceConfig = {
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ExecStart = "${cfg.package}/bin/amazon-ssm-agent";
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KillMode = "process";
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# We want this restating pretty frequently. It could be our only means
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# of accessing the instance.
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Restart = "always";
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RestartPreventExitStatus = 194;
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RestartSec = "90";
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};
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};
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# Add user that Session Manager needs, and give it sudo.
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# This is consistent with Amazon Linux 2 images.
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security.sudo.extraRules = [ sudoRule ];
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security.sudo-rs.extraRules = [ sudoRule ];
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# On Amazon Linux 2 images, the ssm-user user is pretty much a
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# normal user with its own group. We do the same.
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users.groups.ssm-user = {};
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users.users.ssm-user = {
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isNormalUser = true;
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group = "ssm-user";
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};
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environment.etc."amazon/ssm/seelog.xml".source = "${cfg.package}/etc/amazon/ssm/seelog.xml.template";
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environment.etc."amazon/ssm/amazon-ssm-agent.json".source = "${cfg.package}/etc/amazon/ssm/amazon-ssm-agent.json.template";
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};
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}
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