SCRUM#87 - Get distro info on Windows

src/agent/get_distro.cpp

@@ -155,19 +155,17 @@ std::string get_distro_win() {
         try {
             cmd  = exec("systeminfo");
         } catch (std::string err) {
-            throw std::string("unknown distro");
+            return err;
         }
 
-        const std::string key = "Nome do sistema operacional:";
+        const std::string key = "Microsoft Windows";
         std::size_t found;
         found = cmd.find(key);
         std::istringstream iss(cmd);
         while (std::getline(iss, line)) {
             found = line.find(key);
             if (found != std::string::npos) {
-                return line.substr(found+key.length()+1,
-                        // remove key
-                        line.length()-(found+key.length()+1));
+                return line.substr(found);
             }
         }
     } else if (!IsWindowsXPSP1OrGreater()) {