crashpad: detect when crashpad handler is missing

app/common/crashpadinterface.cpp

@@ -71,16 +71,23 @@ bool LinuxExceptionHandler(int, siginfo_t*, ucontext_t*)
 
 bool InitializeCrashpad()
 {
-  QString exe_dir = QCoreApplication::applicationDirPath();
+  QString handler_fn;
 
+  // Determine filename of handler from platform
 #ifdef OS_WIN
-  base::FilePath handler(QSTRING_TO_BASE_STRING(QDir(exe_dir).filePath(QStringLiteral("crashpad_handler.exe"))));
+  handler_fn = QStringLiteral("crashpad_handler.exe");
 #else
-  // FIXME: On Linux, probably should put this in a subdir so that it doesn't conflict with
-  //        anything else in /usr/bin
-  base::FilePath handler(QSTRING_TO_BASE_STRING(QDir(exe_dir).filePath(QStringLiteral("crashpad_handler"))));
+  handler_fn = QStringLiteral("crashpad_handler");
 #endif
 
+  // Generate absolute path
+  QString handler_abs_path = QDir(QCoreApplication::applicationDirPath()).filePath(handler_fn);
+
+  bool status = false;
+
+  if (QFileInfo::exists(handler_abs_path)) {
+    base::FilePath handler(QSTRING_TO_BASE_STRING(handler_fn));
+
     base::FilePath reports_dir = GenerateReportPathForCrashpad();
 
     base::FilePath metrics_dir(QSTRING_TO_BASE_STRING(QDir(OLIVE_NAMESPACE::FileFunctions::GetTempFilePath()).filePath(QStringLiteral("metrics"))));
@@ -104,16 +111,22 @@ bool InitializeCrashpad()
 
     // Start crash handler
     client = new crashpad::CrashpadClient();
-  bool status = client->StartHandler(handler, reports_dir, metrics_dir,
+    status = client->StartHandler(handler, reports_dir, metrics_dir,
                                   "https://olivevideoeditor.org/crashpad/report.php",
                                   annotations, arguments, true, true);
+  }
+
 
   // Override Crashpad exception filter with our own
+  if (status) {
 #if defined(OS_WIN)
     SetUnhandledExceptionFilter(Win32ExceptionHandler);
 #elif defined(OS_LINUX)
     crashpad::CrashpadClient::SetFirstChanceExceptionHandler(LinuxExceptionHandler);
 #endif
+  } else {
+    qWarning() << "Failed to start Crashpad, automatic crash reporting will be disabled";
+  }
 
   return status;
 }