From 4b68729a8a9d0af293abcb3a093f49f59d10b4be Mon Sep 17 00:00:00 2001
From: Joseph Doherty <dohejw01@gmail.com>
Date: Wed, 11 Nov 2026 10:12:49 -0500
Subject: [PATCH] fix(ci): find the docker host without `ip` in the act_runner
 job image (#860)

catthehacker/ubuntu:act-latest ships no iproute2, so fixture_host() fell back to 127.0.0.1 inside the
job container and every published-port fixture timed out (QuestDB is the first one probed over the
network). Read the default gateway from /proc/net/route in plain bash, warn when none is found, and log
the chosen host. Verified in that image on a user-defined network: gateway parsed, published port 200.

Claude-Session: https://claude.ai/code/session_01GT67AD99zQQqpLCVm3p7xk
---
 scripts/ci/integration-fixtures.sh | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/scripts/ci/integration-fixtures.sh b/scripts/ci/integration-fixtures.sh
index 4a4a8effd..41ff32bf8 100755
--- a/scripts/ci/integration-fixtures.sh
+++ b/scripts/ci/integration-fixtures.sh
@@ -42,10 +42,30 @@ questdb_image() {
   echo "$img"
 }
 
+# The job container's default gateway, read from /proc/net/route (#860): the act_runner job image
+# (catthehacker/ubuntu:act-latest) ships no `ip`, so the old `ip route` probe silently fell back to 127.0.0.1
+# inside the container and every published-port fixture (QuestDB first) timed out.
+default_gateway() {
+  if command -v ip >/dev/null 2>&1; then
+    ip route | awk '/^default/{print $3; exit}'; return
+  fi
+  # Columns: Iface Destination Gateway ...; the default route has Destination 00000000. Gateway is little-endian hex.
+  # Plain bash (no gawk strtonum: the image's awk may be mawk).
+  local iface dest gw _
+  [ -r /proc/net/route ] || return 0
+  while read -r iface dest gw _; do
+    if [ "$dest" = "00000000" ] && [ "$gw" != "00000000" ] && [ ${#gw} -eq 8 ]; then
+      echo "$((16#${gw:6:2})).$((16#${gw:4:2})).$((16#${gw:2:2})).$((16#${gw:0:2}))"; return 0
+    fi
+  done < /proc/net/route
+}
+
 fixture_host() {
   if [ -n "${FIXTURE_HOST:-}" ]; then echo "$FIXTURE_HOST"; return; fi
-  if [ -f /.dockerenv ] && command -v ip >/dev/null 2>&1; then
-    ip route | awk '/^default/{print $3; exit}'; return
+  if [ -f /.dockerenv ]; then
+    local gw; gw="$(default_gateway)"
+    if [ -n "$gw" ]; then echo "$gw"; return; fi
+    echo "WARNING: in a container but no default gateway found; falling back to 127.0.0.1" >&2
   fi
   echo 127.0.0.1
 }
@@ -88,6 +108,7 @@ up() {
     < "$ROOT/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Sql.IntegrationTests/Docker/postgres/seed-pg.sql" >/dev/null
   echo "seeded: postgres"
 
+  echo "fixture host: $(fixture_host) (in container: $([ -f /.dockerenv ] && echo yes || echo no))"
   local sqlcmd=/opt/mssql-tools18/bin/sqlcmd
   wait_for "sql server" 300 docker exec otopcua-ci-mssql "$sqlcmd" -C -S localhost -U sa -P "$SA_PASSWORD" -Q 'SELECT 1'
   wait_for "questdb" 120 curl -fsS "http://$(fixture_host):$QDB_HTTP_PORT/exec?query=select%201"