add get aria2 launch cmd method

include/downloader.h

@@ -97,6 +97,7 @@ class Downloader
 
   size_t getNbDownload() { return m_knownDownloads.size(); }
   std::vector<std::string> getDownloadIds();
+  const std::string &getAria2LaunchCmd();
 
  private:
   std::map<std::string, std::unique_ptr<Download>> m_knownDownloads;

src/aria2.cpp

@@ -78,6 +78,9 @@ Aria2::Aria2():
   callCmd.push_back("--max-concurrent-downloads=42");
   callCmd.push_back("--rpc-max-request-size=6M");
   callCmd.push_back("--file-allocation=none");
+  for (auto &cmd : callCmd) {
+      m_launchCmd.append(cmd).append(" ");
+  }
   mp_aria = Subprocess::run(callCmd);
   mp_curl = curl_easy_init();
   char errbuf[CURL_ERROR_SIZE];

src/aria2.h

@@ -26,6 +26,7 @@ class Aria2
     std::string m_downloadDir;
     CURL* mp_curl;
     pthread_mutex_t m_lock;
+    std::string m_launchCmd;
 
     std::string doRequest(const MethodCall& methodCall);
 
@@ -43,6 +44,7 @@ class Aria2
     void pause(const std::string& gid);
     void unpause(const std::string& gid);
     void remove(const std::string& gid);
+    const std::string &getLaunchCmd() { return m_launchCmd; };
 };
 
 }; //end namespace kiwix

src/downloader.cpp

@@ -163,6 +163,11 @@ std::vector<std::string> Downloader::getDownloadIds() {
   return ret;
 }
 
+const std::string &Downloader::getAria2LaunchCmd()
+{ 
+  return mp_aria->getLaunchCmd();
+}
+
 Download* Downloader::startDownload(const std::string& uri)
 {
   for (auto& p: m_knownDownloads) {