Sigal Build command fails due to AttributeError

[thepowerfulwoz]

Traceback (most recent call last):
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\Scripts\sigal.exe\__main__.py", line 7, in <module>
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\site-packages\click\core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\site-packages\sigal\__init__.py", line 173, in build
    gal = Gallery(settings, ncpu=ncpu, quiet=quiet)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\site-packages\sigal\gallery.py", line 692, in __init__
    self.init_pool(ncpu)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\site-packages\sigal\gallery.py", line 800, in init_pool
    self.pool = multiprocessing.Pool(processes=ncpu, initializer=pool_init)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\multiprocessing\context.py", line 119, in Pool
    return Pool(processes, initializer, initargs, maxtasksperchild,
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\multiprocessing\pool.py", line 212, in __init__
    self._repopulate_pool()
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\multiprocessing\pool.py", line 303, in _repopulate_pool
    return self._repopulate_pool_static(self._ctx, self.Process,
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\multiprocessing\pool.py", line 326, in _repopulate_pool_static
    w.start()
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\multiprocessing\process.py", line 121, in start
    self._popen = self._Popen(self)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\multiprocessing\context.py", line 327, in _Popen
    return Popen(process_obj)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Users\Alex\AppData\Local\Programs\Python\Python310\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'Gallery.init_pool.<locals>.pool_init'

Not even sure what the issue is in order to begin solving it. Windows 10.

[Simon Conseil]

Hmm I guess the problem is with

sigal/sigal/gallery.py

Lines 796 to 798 in 246aed5

 def pool_init(): 
     if self.settings['max_img_pixels']: 
         PILImage.MAX_IMAGE_PIXELS = self.settings['max_img_pixels'] 

Could you try with this patch : 5c287be ?

[thepowerfulwoz]

Yes that fixed the issue instantly, thank you. Thanks for making such a great tool!

[Simon Conseil]

Great, thanks for the quick feedback!