postgresql: Fix use with extensions

Fixes #15512 and #16032

With the multi output, postgresql cannot find at runtime what is its
basedir when looking for libdir and pkglibdir. This commit fixes that.

2 files changed, 33 insertions, 1 deletions

diff --git a/nixos/modules/services/databases/postgresql.nix b/nixos/modules/services/databases/postgresql.nix
index 9988fc6e63b..24ef4637ec9 100644
--- a/nixos/modules/services/databases/postgresql.nix
+++ b/nixos/modules/services/databases/postgresql.nix
@@ -11,12 +11,14 @@ let
     if cfg.extraPlugins == [] then pg
     else pkgs.buildEnv {
       name = "postgresql-and-plugins-${(builtins.parseDrvName pg.name).version}";
-      paths = [ pg ] ++ cfg.extraPlugins;
+      paths = [ pg pg.lib ] ++ cfg.extraPlugins;
+      buildInputs = [ pkgs.makeWrapper ];
       postBuild =
         ''
           mkdir -p $out/bin
           rm $out/bin/{pg_config,postgres,pg_ctl}
           cp --target-directory=$out/bin ${pg}/bin/{postgres,pg_config,pg_ctl}
+          wrapProgram $out/bin/postgres --set NIX_PGLIBDIR $out/lib
         '';
     };
 
diff --git a/nixos/tests/postgis.nix b/nixos/tests/postgis.nix
new file mode 100644
index 00000000000..1dba5c363c0
--- /dev/null
+++ b/nixos/tests/postgis.nix
@@ -0,0 +1,30 @@
+import ./make-test.nix ({ pkgs, ...} : {
+  name = "postgis";
+  meta = with pkgs.stdenv.lib.maintainers; {
+    maintainers = [ lsix ];
+  };
+
+  nodes = {
+    master =
+      { pkgs, config, ... }:
+
+      {
+        services.postgresql = let mypg = pkgs.postgresql95; in {
+            enable = true;
+            package = mypg;
+            extraPlugins = [ (pkgs.postgis.override { postgresql = mypg; }).v_2_2_1 ];
+            initialScript =  pkgs.writeText "postgresql-init.sql"
+          ''
+          CREATE ROLE postgres WITH superuser login createdb;
+          '';
+          };
+      };
+  };
+
+  testScript = ''
+    startAll;
+    $master->waitForUnit("postgresql");
+    $master->sleep(10); # Hopefully this is long enough!!
+    $master->succeed("sudo -u postgres psql -c 'CREATE EXTENSION postgis;'");
+  '';
+})