don't overwrite config on update

Config.cpp namespace instead of static class
print version on service startup

CMakeLists.txt

@@ -1,3 +1,6 @@
+# author Lukas Heiligenbrunner
+# main CMake file
+#
 cmake_minimum_required(VERSION 3.13)
 project(iprefresher DESCRIPTION "Dynu ip refresher")
 
@@ -47,7 +50,7 @@ message("")
 
 #add version header
 FILE(WRITE ${CMAKE_SOURCE_DIR}/inc/Version.h
-        "\#pragma once\nclass Version {\npublic:\n  static const std::string VERSION;\n};\n\nstd::string const Version::VERSION = \"${PROJECT_VERSION}\";"
+        "\#pragma once\n#include <string>\nnamespace Version {\n  const std::string VERSION = \"${PROJECT_VERSION}\";\n}"
         )
 
 add_library(api ${LIB_METHOD}
@@ -78,9 +81,17 @@ target_link_libraries(iprefresher api logger ${CURL_LIBRARIES} config++)
 
 # INSTALL to SYSTEM #
 set(CMAKE_INSTALL_PREFIX "/")
+# install binaries
 install(TARGETS iprefresher DESTINATION usr/bin)
+# install config file if it doesn't exist
+install(CODE "MESSAGE(STATUS \"Copy iprefresher.cfg to ${CMAKE_INSTALL_PREFIX}etc/iprefresher.cfg\")
+    IF (NOT EXISTS ${CMAKE_INSTALL_PREFIX}etc/iprefresher.cfg)
+        EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E copy
+                ${CMAKE_CURRENT_SOURCE_DIR}/config/iprefresher.cfg
+                ${CMAKE_INSTALL_PREFIX}etc/iprefresher.cfg)
+    ENDIF (NOT EXISTS ${CMAKE_INSTALL_PREFIX}etc/iprefresher.cfg)")
+# install systemd service and enable it
 install(FILES service/iprefresher.service DESTINATION lib/systemd/system)
-install(FILES config/iprefresher.cfg DESTINATION etc)
 
 
 IF (UNIX)

src/Config.cpp

@@ -5,6 +5,7 @@
 #include <Config.h>
 #include <iostream>
 #include <cstring>
+#include <fstream>
 
 #include "libconfig.h++"
 
@@ -22,7 +23,31 @@ bool Config::readCredentials() {
     }
     catch (const libconfig::FileIOException &fioex) {
         std::cout << "I/O error while reading config file." << std::endl << "creating new config file!" << std::endl;
-        cfg.writeFile("/etc/iprefresher.cfg");
+
+        std::string defaultconf = R"(# Dynu IP refresher config
+# 2020
+# Lukas Heiligenbrunner
+
+## DYNU API Config
+dynuapikey = ""
+domainid = ""
+domainname = ""
+
+## Telegram API Config (optional)
+#telegramApiKey = ""
+#chatId = ""
+)";
+
+        std::ofstream myfile;
+        myfile.open("/etc/iprefresher.cfg");
+        if(myfile.is_open()){
+            myfile << defaultconf;
+            myfile.close();
+        } else {
+            std::cout << "error creating file" << std::endl;
+        }
+
+
         return false;
     }
     catch (const libconfig::ParseException &pex) {

src/IPRefresher.cpp

@@ -15,6 +15,7 @@
 
 #include <IPRefresher.h>
 #include <Config.h>
+#include <Version.h>
 
 void IPRefresher::checkIPAdress(bool force) {
     FileLogger logger;
@@ -55,6 +56,7 @@ IPRefresher::IPRefresher() = default;
 IPRefresher::IPRefresher(bool loop) {
     if (loop) {
         Logger::message("startup of service");
+        Logger::message("Version: " + Version::VERSION);
         if (Config::readCredentials()) {
             while (true) {
                 Logger::message("starting check");

src/main.cpp

@@ -3,8 +3,8 @@
 //
 
 #include <iostream>
-#include <IPRefresher.h>
 #include <Version.h>
+#include <IPRefresher.h>
 #include <Logger.h>
 #include <Config.h>