[2.0a4] Disks less than 4MB in size cause a traceback on the MAAS server

[Brendan Donegan]

I came across the following traceback when running MAAS on my laptop using 'make run':

==> logs/regiond2/current <==
2016-05-10 17:42:00 [maasserver] ERROR: ################################ Exception: {'size': ['Ensure this value is greater than or equal to 4194304.']} ################################
2016-05-10 17:42:00 [maasserver] ERROR: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/django/core/handlers/base.py", line 132, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/brendand/src/maas/trunk/src/maasserver/utils/views.py", line 180, in view_atomic_with_post_commit_savepoint
    return view_atomic(*args, **kwargs)
  File "/usr/lib/python3.5/contextlib.py", line 30, in inner
    return func(*args, **kwds)
  File "/home/brendand/src/maas/trunk/src/maasserver/api/support.py", line 54, in __call__
    response = upcall(request, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/django/views/decorators/vary.py", line 21, in inner_func
    response = func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/piston3/resource.py", line 190, in __call__
    result = self.error_handler(e, request, meth, em_format)
  File "/usr/lib/python3/dist-packages/piston3/resource.py", line 188, in __call__
    result = meth(request, *args, **kwargs)
  File "/home/brendand/src/maas/trunk/src/maasserver/api/support.py", line 235, in dispatch
    return function(self, request, *args, **kwargs)
  File "/home/brendand/src/maas/trunk/src/metadataserver/api.py", line 494, in signal
    self._store_commissioning_results(node, request)
  File "/home/brendand/src/maas/trunk/src/metadataserver/api.py", line 441, in _store_commissioning_results
    exit_status=script_result)
  File "/home/brendand/src/maas/trunk/src/metadataserver/models/commissioningscript.py", line 324, in update_node_physical_block_devices
    serial=serial,
  File "/usr/lib/python3/dist-packages/django/db/models/manager.py", line 127, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/django/db/models/query.py", line 348, in create
    obj.save(force_insert=True, using=self.db)
  File "/home/brendand/src/maas/trunk/src/maasserver/models/cleansave.py", line 28, in save
    self.full_clean()
  File "/usr/lib/python3/dist-packages/django/db/models/base.py", line 1171, in full_clean
    raise ValidationError(errors)
django.core.exceptions.ValidationError: {'size': ['Ensure this value is greater than or equal to 4194304.']}

This was due to having a GPS watch plugged in which was showing itself as a disk of 978k in size.

[Blake Rouse (blake-rouse)]

That disk should be skipped and not added to MAAS.

[Lee Trager (ltrager)]

Brendan, could you please verify the MP linked fixes your problem? I tested using a small loop back device but I don't have a GPS watch to verify with.