From 9f00d8a38e5268b4799a32ce94f575e404021452 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Thu, 29 Jul 2021 12:05:51 +0200
Subject: [PATCH] modules: services: add postgresql

Enable the service itself in other modules when needed, but pin the
package in a single place.
---
 modules/services/default.nix    |  1 +
 modules/services/drone.nix      |  1 +
 modules/services/matrix.nix     |  1 -
 modules/services/postgresql.nix | 18 ++++++++++++++++++
 4 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 modules/services/postgresql.nix

diff --git a/modules/services/default.nix b/modules/services/default.nix
index a0f11fd..29ae034 100644
--- a/modules/services/default.nix
+++ b/modules/services/default.nix
@@ -20,6 +20,7 @@
     ./pirate.nix
     ./podgrab.nix
     ./postgresql-backup.nix
+    ./postgresql.nix
     ./quassel.nix
     ./rss-bridge.nix
     ./sabnzbd.nix
diff --git a/modules/services/drone.nix b/modules/services/drone.nix
index 50119ac..b1e80ea 100644
--- a/modules/services/drone.nix
+++ b/modules/services/drone.nix
@@ -81,6 +81,7 @@ in
     users.groups.drone = { };
 
     services.postgresql = {
+      enable = true;
       ensureDatabases = [ "drone" ];
       ensureUsers = [{
         name = "drone";
diff --git a/modules/services/matrix.nix b/modules/services/matrix.nix
index 8f8c82e..5d81448 100644
--- a/modules/services/matrix.nix
+++ b/modules/services/matrix.nix
@@ -63,7 +63,6 @@ in
   config = lib.mkIf cfg.enable {
     services.postgresql = {
       enable = true;
-      package = pkgs.postgresql_12;
       initialScript = pkgs.writeText "synapse-init.sql" ''
         CREATE ROLE "matrix-synapse" WITH LOGIN PASSWORD 'synapse';
         CREATE DATABASE "matrix-synapse" WITH OWNER "matrix-synapse"
diff --git a/modules/services/postgresql.nix b/modules/services/postgresql.nix
new file mode 100644
index 0000000..8da9ab7
--- /dev/null
+++ b/modules/services/postgresql.nix
@@ -0,0 +1,18 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.services.postgresql;
+in
+{
+  options.my.services.postgresql = with lib; {
+    enable = my.mkDisableOption "postgres configuration";
+  };
+
+  config = lib.mkMerge [
+    # Let other services enable postgres when they need it
+    (lib.mkIf cfg.enable {
+      services.postgresql = {
+        package = pkgs.postgresql_12;
+      };
+    })
+  ];
+}