Switch back to using $USER to get username

Author: Flamefire

libs/common/src/System_Other.cpp

@@ -16,8 +16,7 @@
 // along with Return To The Roots. If not, see <http://www.gnu.org/licenses/>.
 
 #include "System.h"
-#include <pwd.h>
-#include <unistd.h>
+#include <stdexcept>
 
 boost::filesystem::path System::getHomePath()
 {
@@ -33,7 +32,8 @@ boost::filesystem::path System::getHomePath()
 
 std::string System::getUserName()
 {
-    const auto uid = geteuid();
-    const auto* pw = getpwuid(uid);
-    return pw ? pw->pw_name : "";
+    const std::string name = getEnvVar("USER");
+    if(name.empty())
+        throw std::runtime_error("Could not get username");
+    return name;
 }