chanbackup: add helpers to verify peer_storage as well in verifybackup.

plugins/chanbackup.c

@@ -822,6 +822,37 @@ static bool verify_bkp(struct command *cmd,
 	return true;
 }
 
+static struct command_result *after_fetchscb(struct command *cmd,
+					     const u8 *hexdata,
+					     struct json_stream *response)
+{
+	u64 version;
+	u32 timestamp;
+	struct scb_chan **scb;
+
+	if (tal_bytelen(hexdata) == 0) {
+		json_add_string(response, "peer_storage",
+				"Does not exist!");
+		return command_finished(cmd, response);
+	}
+
+	if (!fromwire_static_chan_backup(cmd,
+					 hexdata,
+					 &version,
+					 &timestamp,
+					 &scb)) {
+		json_add_string(response, "peer_storage", "Corrupted SCB on disk!");
+		return command_finished(cmd, response);
+	}
+
+	if (version != VERSION) {
+		json_add_string(response,"peer_storage",
+							"Incompatible version, Contact the admin or update the backup immediately!");
+		return command_finished(cmd, response);
+	}
+	json_add_bool(response, "peer_storage", true);
+	return command_finished(cmd, response);
+}
 
 static struct command_result *json_verifybackup(struct command *cmd,
 						const char *buf,
@@ -844,8 +875,11 @@ static struct command_result *json_verifybackup(struct command *cmd,
 		json_add_bool(response, "emergency.recover", true);
 	}
 
-	return command_finished(cmd, response);
-
+	return jsonrpc_get_datastore_binary(cmd->plugin,
+					    cmd,
+					    "chanbackup/latestscb",
+					    after_fetchscb,
+					    response);
 }
 
 static const char *init(struct plugin *p,