From 8639182fa40a55e70ce03a243ad9f5b366afc7a5 Mon Sep 17 00:00:00 2001
From: Sander van der Burg <svanderburg@gmail.com>
Date: Fri, 22 Sep 2023 00:13:47 +0200
Subject: [PATCH] Add container service for the simple PostgreSQL variant

---
 service-containers-agnostic/constructors.nix  |  9 ++++
 .../postgresql/default.nix                    |  1 +
 .../postgresql/simplepostgresql.nix           | 45 +++++++++++++++++++
 3 files changed, 55 insertions(+)
 create mode 100644 service-containers-agnostic/postgresql/simplepostgresql.nix

diff --git a/service-containers-agnostic/constructors.nix b/service-containers-agnostic/constructors.nix
index 1b8eaa7..5ba1c95 100644
--- a/service-containers-agnostic/constructors.nix
+++ b/service-containers-agnostic/constructors.nix
@@ -89,6 +89,15 @@ in
     });
   };
 
+  simplePostgresql = import ./postgresql/simplepostgresql.nix {
+    inherit runtimeDir;
+    inherit (pkgs) lib;
+    postgresqlConstructorFun = constructors.simplePostgresql;
+    dysnomia = pkgs.dysnomia.override (origArgs: {
+      enablePostgreSQLDatabase = true;
+    });
+  };
+
   extendableSupervisord = import ./supervisord/extendable.nix {
     inherit libDir;
     inherit (pkgs) lib;
diff --git a/service-containers-agnostic/postgresql/default.nix b/service-containers-agnostic/postgresql/default.nix
index 6eb9b2f..eb60705 100644
--- a/service-containers-agnostic/postgresql/default.nix
+++ b/service-containers-agnostic/postgresql/default.nix
@@ -30,6 +30,7 @@ in
 rec {
   name = instanceName;
   postgresqlPort = port;
+  postgresqlRuntimeDir = "${runtimeDir}/${instanceName}";
   postgresqlUsername = username;
 
   inherit pkg;
diff --git a/service-containers-agnostic/postgresql/simplepostgresql.nix b/service-containers-agnostic/postgresql/simplepostgresql.nix
new file mode 100644
index 0000000..1aa9412
--- /dev/null
+++ b/service-containers-agnostic/postgresql/simplepostgresql.nix
@@ -0,0 +1,45 @@
+{postgresqlConstructorFun, lib, dysnomia, runtimeDir}:
+
+{ instanceSuffix ? "", instanceName ? "postgresql${instanceSuffix}"
+, containerName ? "postgresql-database${instanceSuffix}"
+, port ? 5432
+, authentication ? null
+, identMap ? null
+, enableTCPIP ? false
+, settings ? {}
+, type ? null
+, properties ? {}
+}:
+
+let
+  username = instanceName;
+
+  pkg = postgresqlConstructorFun {
+    inherit instanceName instanceSuffix port authentication identMap enableTCPIP settings;
+    postInstall = ''
+      # Add Dysnomia container configuration file for PostgreSQL
+      mkdir -p $out/etc/dysnomia/containers
+      cat > $out/etc/dysnomia/containers/${containerName} <<EOF
+      postgresqlPort=${toString port}
+      postgresqlRuntimeDir=${runtimeDir}/${instanceName}
+      postgresqlUsername=${username}
+      EOF
+
+      # Copy the Dysnomia module that manages a PostgreSQL database
+      mkdir -p $out/libexec/dysnomia
+      ln -s ${dysnomia}/libexec/dysnomia/postgresql-database $out/libexec/dysnomia
+    '';
+  };
+in
+rec {
+  name = instanceName;
+  postgresqlPort = port;
+  postgresqlRuntimeDir = "${runtimeDir}/${instanceName}";
+  postgresqlUsername = username;
+
+  inherit pkg;
+
+  providesContainer = containerName;
+} // lib.optionalAttrs (type != null) {
+  inherit type;
+} // properties