add option to submit logs when download fails

Mergin/projects_manager.py

@@ -471,6 +471,8 @@ def download_project(self, project):
                     dlg.exception_details(),
                     "Project download",
                     f"Failed to download project {project_name} due to an unhandled exception.",
+                    dlg.log_file,
+                    self.mc.username(),
                 )
             return
         if not dlg.is_complete:

Mergin/sync_dialog.py

@@ -48,6 +48,7 @@ def __init__(self, parent=None):
         self.exception_tb = None
         self.is_complete = False
         self.job = None
+        self.log_file = None
 
         self.timer = QTimer(self)
         self.timer.setInterval(100)
@@ -72,6 +73,8 @@ def cancel_operation(self):
             self.pull_cancel()
 
     def reset_operation(self, success, close, exception=None):
+        if self.job.failure_log_file is not None:
+            self.log_file = self.job.failure_log_file
         self.operation = None
         self.mergin_client = None
         self.target_dir = None

Mergin/utils.py

@@ -900,7 +900,7 @@ def login_error_message(e):
     QMessageBox.critical(None, "Login failed", msg, QMessageBox.Close)
 
 
-def unhandled_exception_message(error_details, dialog_title, error_text):
+def unhandled_exception_message(error_details, dialog_title, error_text, log_file=None, username=None):
     msg = (
         error_text + "<p>This should not happen, "
         '<a href="https://github.com/MerginMaps/qgis-mergin-plugin/issues">'
@@ -910,7 +910,20 @@ def unhandled_exception_message(error_details, dialog_title, error_text):
     box.setIcon(QMessageBox.Critical)
     box.setWindowTitle(dialog_title)
     box.setText(msg)
-    box.setDetailedText(error_details)
+    if log_file is None:
+        box.setDetailedText(error_details)
+    else:
+        error_details = (
+            "An error occured during project synchronisation. The log was saved to "
+            f"{log_file}. Click 'Send logs' to send a diagnostic log to the developers "
+            "to help them determine the exact cause of the problem.\n\n"
+            "The log does not contain any of your data, only file names. "
+            "It would be useful if you also send a mail to [email protected] "
+            "and briefly describe the problem to add more context to the diagnostic log."
+        )
+        box.setDetailedText(error_details)
+        btn = box.addButton("Send logs", QMessageBox.ActionRole)
+        btn.clicked.connect(lambda: submit_logs(username, log_file))
     box.exec_()