Shadow database demotion checks from native path

ocf/loxthelion/managed-container.d/applications/postgresql/native_peers.sh

@@ -29,6 +29,59 @@ mc_peer_write_recovery \"\$PGDATA\" \"\$1\" \"\$2\" \"\$3\" \"\$4\" \"\$5\"" sh
         "${REPLICATION_USER}" "${OCF_RESKEY_CRM_meta_on_node:-$(hostname)}" "${REPLICATION_SLOT}"
 }
 
+mc_pg_demote_database_shadow()
+{
+    local socket_path resource response rc
+
+    socket_path="${MC_PROXY_SOCKET:-/run/user/1000/managed-containerd/managed-containerd.sock}"
+    resource="${OCF_RESOURCE_INSTANCE:-}"
+    resource="${resource%%:*}"
+
+    [ -n "${resource}" ] || return 0
+
+    response="$(
+        timeout --kill-after=1s 5s \
+            python3 \
+            "${MC_PROXY_CLIENT:-/usr/lib/ocf/resource.d/loxthelion/managed-container.d/proxy_client.py}" \
+            "${socket_path}" \
+            "${resource}" \
+            "demote.database" \
+            10 \
+            11
+    )"
+    rc=$?
+
+    if [ "${rc}" -ne 0 ]; then
+        ocf_log warn \
+            "managed-containerd demote.database shadow unavailable rc=${rc}"
+        return 0
+    fi
+
+    if MC_DAEMON_RESPONSE="${response}" python3 -c '
+import json
+import os
+
+response = json.loads(os.environ["MC_DAEMON_RESPONSE"])
+
+if (
+    response.get("ocf_rc") != 0
+    or response.get("ready") is not True
+    or response.get("mutation") is not False
+    or response.get("final_handoff_required") is not True
+):
+    raise SystemExit(1)
+'; then
+        ocf_log info \
+            "managed-containerd demote.database shadow: comparison=MATCH response=${response}"
+    else
+        ocf_log err \
+            "managed-containerd demote.database shadow MISMATCH response=${response}"
+    fi
+
+    return 0
+}
+
+
 mc_pg_native_demote()
 (
     local mc_native_started=${SECONDS}
@@ -100,6 +153,8 @@ mc_pg_native_demote()
         return "${OCF_ERR_GENERIC}"
     }
 
+    mc_pg_demote_database_shadow
+
     if [ "$(printf '%s' "${target_node}" | tr '[:upper:]' '[:lower:]')" = \
          "$(printf '%s' "${local_node}" | tr '[:upper:]' '[:lower:]')" ]; then
         self_restart=true