ecs-agent NixOS module: init

A very simple skeleton for now that doesn't attempt to model any of
the agent configuration, but we can grow it later. Tested and works
on an EC2 instance with ECS.

2 files changed, 43 insertions, 0 deletions

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index d2d7203119a..afaaccb0156 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -645,6 +645,7 @@
   ./virtualisation/container-config.nix
   ./virtualisation/containers.nix
   ./virtualisation/docker.nix
+  ./virtualisation/ecs-agent.nix
   ./virtualisation/libvirtd.nix
   ./virtualisation/lxc.nix
   ./virtualisation/lxcfs.nix
diff --git a/nixos/modules/virtualisation/ecs-agent.nix b/nixos/modules/virtualisation/ecs-agent.nix
new file mode 100644
index 00000000000..5e28d8379cb
--- /dev/null
+++ b/nixos/modules/virtualisation/ecs-agent.nix
@@ -0,0 +1,42 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.services.ecs-agent;
+in {
+  options.services.ecs-agent = {
+    enable = mkEnableOption "Amazon ECS agent";
+
+    package = mkOption {
+      type = types.path;
+      description = "The ECS agent package to use";
+      default = pkgs.ecs-agent;
+    };
+
+    extra-environment = mkOption {
+      type = types.attrsOf types.str;
+      description = "The environment the ECS agent should run with. See the ECS agent documentation for keys that work here.";
+      default = {};
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.ecs-agent = {
+      inherit (cfg.package.meta) description;
+      after    = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+
+      environment = cfg.extra-environment;
+
+      script = ''
+        if [ ! -z "$ECS_DATADIR" ]; then
+          echo "FOOOO"
+          mkdir -p "$ECS_DATADIR"
+        fi
+        ${cfg.package.bin}/bin/agent
+      '';
+    };
+  };
+}
+