fix: rds handoff path

scripts/images/rds-postgres/rds-agent.initd

@@ -13,7 +13,6 @@ error_log="/var/log/rds-agent.log"
 start_stop_daemon_args="--wait 2000"
 
 AGENT_ENV="/etc/spinifex-rds/agent.env"
-HANDOFF_ENV="${RDS_HANDOFF_DIR:-/run/spinifex-rds}/bootstrap.env"
 
 # The agent retries indefinitely, so this only bounds how long the boot waits
 # before letting rds-init fail visibly rather than hanging forever.
@@ -42,6 +41,10 @@ start_pre() {
 }
 
 start_post() {
+    # Resolve this after start_pre loads agent.env so custom handoff directories
+    # are shared by the agent, this wait, and rds-init.
+    HANDOFF_ENV="${RDS_HANDOFF_DIR:-/run/spinifex-rds}/bootstrap.env"
+
     # `before rds-init` only orders the starts; rds-init needs the fetched config
     # itself. The agent writes bootstrap.env last and renames it into place, so
     # its appearance means the whole handoff is there.

scripts/images/rds-postgres/rds-agent_initd_test.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+set -eu
+
+SCRIPT_DIR=$(CDPATH='' cd -- "$(dirname -- "$0")" && pwd)
+CASE=$(mktemp -d)
+trap 'rm -rf "${CASE}"' EXIT
+
+source_time_handoff="${CASE}/source-time"
+configured_handoff="${CASE}/configured"
+mkdir -p "${configured_handoff}"
+touch "${configured_handoff}/bootstrap.env"
+printf 'RDS_HANDOFF_DIR=%s\n' "${configured_handoff}" >"${CASE}/agent.env"
+
+# Simulate OpenRC sourcing the service before start_pre loads agent.env.
+export RDS_HANDOFF_DIR="${source_time_handoff}"
+# shellcheck source=rds-agent.initd
+. "${SCRIPT_DIR}/rds-agent.initd"
+export AGENT_ENV="${CASE}/agent.env"
+export handoff_timeout=0
+
+EEND_STATUS=
+ebegin() { :; }
+einfo() { :; }
+eend() { EEND_STATUS=$1; }
+
+start_pre
+start_post
+
+if [ "${HANDOFF_ENV}" != "${configured_handoff}/bootstrap.env" ]; then
+    echo "FAIL: handoff path did not use RDS_HANDOFF_DIR from agent.env" >&2
+    exit 1
+fi
+if [ "${EEND_STATUS}" != "0" ]; then
+    echo "FAIL: post-start wait did not find the configured handoff" >&2
+    exit 1
+fi
+
+echo "rds-agent.initd: all tests passed"