nixos/postgresql: turn `settings` into a submodule

The main idea behind that was to be able to do more sophisticated
merging for stuff that goes into `postgresql.conf`:
`shared_preload_libraries` is a comma-separated list in a `types.str`
and thus not mergeable. With this change, the option accepts both a
comma-separated string xor a list of strings.

This can be implemented rather quick using `coercedTo` +
freeform modules. The interface still behaves equally, but it allows to
merge declarations for this option together.

One side-effect was that I had to change the `attrsOf (oneOf ...)` part into
a submodule to allow declaring options for certain things. While at it,
I decided to move `log_line_prefix` and `port` into this structure as
well.

1 files changed, 1 insertions, 1 deletions

diff --git a/nixos/tests/invidious.nix b/nixos/tests/invidious.nix
index e31cd87f6a004..372b47b56c345 100644
--- a/nixos/tests/invidious.nix
+++ b/nixos/tests/invidious.nix
@@ -18,7 +18,7 @@ import ./make-test-python.nix ({ pkgs, ... }: {
           host invidious invidious samenet scram-sha-256
         '';
       };
-      networking.firewall.allowedTCPPorts = [ config.services.postgresql.port ];
+      networking.firewall.allowedTCPPorts = [ config.services.postgresql.settings.port ];
     };
     machine = { config, lib, pkgs, ... }: {
       services.invidious = {