There is a very rare situation when a process finishes immediately, and the EOF (indicating that the process completed) occurs before any percentage output is generated by the process.
exception in thread Thread-38:
Traceback (most recent call last):
File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
self.run()
File "/usr/lib/python3.9/threading.py", line 892, in run
self._target(*self._args, **self._kwargs)
File "/usr/share/cubic/cubic/navigator.py", line 566, in navigate
result = new_page.enter(action, page) if new_page else None
File "/usr/share/cubic/cubic/pages/generate_page.py", line 200, in enter
is_error = create_iso_image()
File "/usr/share/cubic/cubic/pages/generate_page.py", line 943, in create_iso_image
exception, message = show_progress(command, progress_callback, working_directory=model.project.custom_disk_directory)
File "/usr/share/cubic/cubic/utilities/progressor.py", line 312, in show_progress
exception, message = process_command(command, progress_tracker, working_directory)
File "/usr/share/cubic/cubic/utilities/progressor.py", line 274, in process_command
if percent < FINAL_PERCENT:
UnboundLocalError: local variable 'percent' referenced before assignment
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In this case, we need to increment the final percent from zero to 100%. However, the percent variable is not assigned, and this results in the following error:
UnboundLocalError: local variable 'percent' referenced before assignment
The solution is to initialize the percent variable before we begin executing the process.