From d1c80a8748e2b58ff22224ad140a78e51b37f13d Mon Sep 17 00:00:00 2001
From: Daniel Widgren <daniel.widgren@gmail.com>
Date: Sun, 3 May 2026 12:20:27 +0200
Subject: [PATCH] feat: ASOBI_DB_SOCKET_OPTS=inet default for kura pool

Pairs with widgrensit/asobi PR for env-controlled socket_options.
Default inet keeps existing IPv4 deployments unchanged. On IPv6-only
Postgres networks (Fly, certain k8s setups), override with
ASOBI_DB_SOCKET_OPTS=inet6.

Approved by asobi-architecture-guardian and erlang-code-reviewer.
---
 Dockerfile                 | 4 ++++
 config/prod_sys.config.src | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index 1e129b9..a2f61df 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -47,5 +47,9 @@ ENV ASOBI_PORT=8080 \
     ASOBI_DB_USER=postgres \
     ASOBI_DB_PASSWORD=postgres
 
+# Erlang term fragment spliced into kura's socket_options list.
+# Default forces IPv4; set to "inet6" for IPv6-only Postgres networks.
+ENV ASOBI_DB_SOCKET_OPTS=inet
+
 ENTRYPOINT ["tini", "--"]
 CMD ["bin/asobi_lua", "foreground"]
diff --git a/config/prod_sys.config.src b/config/prod_sys.config.src
index 304a4c6..ef77b46 100644
--- a/config/prod_sys.config.src
+++ b/config/prod_sys.config.src
@@ -41,7 +41,8 @@
         {database, "${ASOBI_DB_NAME}"},
         {user, "${ASOBI_DB_USER}"},
         {password, "${ASOBI_DB_PASSWORD}"},
-        {pool_size, 10}
+        {pool_size, 10},
+        {socket_options, [${ASOBI_DB_SOCKET_OPTS}]}
     ]},
     {asobi, [
         {game_dir, "/app/game"}