[solved] Migrate from 5.1.x to 5.2.x -> error in plone.app.widgets

1

Hi,
I just tried to migrate 5.1-latest to 5.2-latest on py2 but get the following traceback:

2021-12-09 08:50:04,560 ERROR   [plone.app.upgrade:299][waitress-1] Upgrade aborted. Error:
Traceback (most recent call last):
  File "/Volumes/WORKSPACE2/interreg/eggs/Products.CMFPlone-5.2.6-py2.7.egg/Products/CMFPlone/MigrationTool.py", line 292, in upgrade
    step['step'].doStep(setup)
  File "/Volumes/WORKSPACE2/interreg/eggs/Products.GenericSetup-2.1.4-py2.7.egg/Products/GenericSetup/upgrade.py", line 168, in doStep
    self.handler(tool)
  File "/Volumes/WORKSPACE2/interreg/eggs/plone.app.upgrade-2.0.41-py2.7.egg/plone/app/upgrade/v52/alphas.py", line 89, in to52alpha1
    loadMigrationProfile(context, 'profile-plone.app.upgrade.v52:to52alpha1')
  File "/Volumes/WORKSPACE2/interreg/eggs/plone.app.upgrade-2.0.41-py2.7.egg/plone/app/upgrade/utils.py", line 203, in loadMigrationProfile
    context.runAllImportStepsFromProfile(profile, purge_old=False)
  File "/Volumes/WORKSPACE2/interreg/eggs/Products.GenericSetup-2.1.4-py2.7.egg/Products/GenericSetup/tool.py", line 405, in runAllImportStepsFromProfile
    dependency_strategy=dependency_strategy)
  File "/Volumes/WORKSPACE2/interreg/eggs/Products.GenericSetup-2.1.4-py2.7.egg/Products/GenericSetup/tool.py", line 1487, in _runImportStepsFromContext
    message = self._doRunImportStep(step, context)
  File "/Volumes/WORKSPACE2/interreg/eggs/Products.GenericSetup-2.1.4-py2.7.egg/Products/GenericSetup/tool.py", line 1299, in _doRunImportStep
    return handler(context)
  File "/Volumes/WORKSPACE2/interreg/eggs/Products.CMFPlone-5.2.6-py2.7.egg/Products/CMFPlone/resources/exportimport/bundles.py", line 34, in combine
    combine_bundles(site)
  File "/Volumes/WORKSPACE2/interreg/eggs/Products.CMFPlone-5.2.6-py2.7.egg/Products/CMFPlone/resources/browser/combine.py", line 180, in combine_bundles
    write_js(context, production_folder, 'default')
  File "/Volumes/WORKSPACE2/interreg/eggs/Products.CMFPlone-5.2.6-py2.7.egg/Products/CMFPlone/resources/browser/combine.py", line 120, in write_js
    folder.writeFile(meta_bundle + '.js', fi)
  File "/Volumes/WORKSPACE2/interreg/eggs/plone.resource-2.1.4-py2.7.egg/plone/resource/directory.py", line 163, in writeFile
    f = File(filename, filename, data)
  File "/Volumes/WORKSPACE2/interreg/eggs/Zope-4.6.3-py2.7.egg/OFS/Image.py", line 157, in __init__
    data, size = self._read_data(file)
  File "/Volumes/WORKSPACE2/interreg/eggs/Zope-4.6.3-py2.7.egg/OFS/Image.py", line 617, in _read_data
    transaction.savepoint(optimistic=True)
  File "/Volumes/WORKSPACE2/interreg/eggs/transaction-3.0.1-py2.7.egg/transaction/_manager.py", line 272, in savepoint
    return self.manager.savepoint(optimistic)
  File "/Volumes/WORKSPACE2/interreg/eggs/transaction-3.0.1-py2.7.egg/transaction/_manager.py", line 150, in savepoint
    return self.get().savepoint(optimistic)
  File "/Volumes/WORKSPACE2/interreg/eggs/transaction-3.0.1-py2.7.egg/transaction/_transaction.py", line 228, in savepoint
    self._saveAndRaiseCommitishError()  # reraises!
  File "/Volumes/WORKSPACE2/interreg/eggs/transaction-3.0.1-py2.7.egg/transaction/_transaction.py", line 316, in _saveAndRaiseCommitishError
    reraise(t, v, tb)
  File "/Volumes/WORKSPACE2/interreg/eggs/transaction-3.0.1-py2.7.egg/transaction/_transaction.py", line 225, in savepoint
    savepoint = Savepoint(self, optimistic, *self._resources)
  File "/Volumes/WORKSPACE2/interreg/eggs/transaction-3.0.1-py2.7.egg/transaction/_transaction.py", line 626, in __init__
    savepoint = savepoint()
  File "/Volumes/WORKSPACE2/interreg/eggs/ZODB-5.6.0-py2.7.egg/ZODB/Connection.py", line 997, in savepoint
    self._commit(None)
  File "/Volumes/WORKSPACE2/interreg/eggs/ZODB-5.6.0-py2.7.egg/ZODB/Connection.py", line 546, in _commit
    self._store_objects(ObjectWriter(obj), transaction)
  File "/Volumes/WORKSPACE2/interreg/eggs/ZODB-5.6.0-py2.7.egg/ZODB/Connection.py", line 578, in _store_objects
    p = writer.serialize(obj)  # This calls __getstate__ of obj
  File "/Volumes/WORKSPACE2/interreg/eggs/ZODB-5.6.0-py2.7.egg/ZODB/serialize.py", line 430, in serialize
    return self._dump(meta, obj.__getstate__())
  File "/Volumes/WORKSPACE2/interreg/eggs/ZODB-5.6.0-py2.7.egg/ZODB/serialize.py", line 439, in _dump
    self._p.dump(state)
PicklingError: Can't pickle <class 'plone.app.widgets.interfaces.IWidgetsLayer'>: attribute lookup plone.app.widgets.interfaces.IWidgetsLayer failed

which is obvious, because plone.app.widgets.interfaces.IWidgetsLayer was removed since 3.0 ...

Has anybody else this problem and maybe a solution?

Thx

2

Where's the related issue on GitHub?

3

If its a browser-layer it should be configured in the olds site ZMI components tab on the Plone site-root, where it can be removed before migration.

4

Thanks for the tip. I've found the interface in the components tab. Though trying to remove it leads to another traceback when saving the list:

2021-12-09 12:02:27,887 ERROR   [Zope.SiteErrorLog:252][waitress-2] 1639047747.890.331829548938 http://localhost:8080/Plone/manage_components
Traceback (innermost last):
  Module ZPublisher.WSGIPublisher, line 162, in transaction_pubevents
  Module ZPublisher.WSGIPublisher, line 371, in publish_module
  Module ZPublisher.WSGIPublisher, line 274, in publish
  Module ZPublisher.mapply, line 85, in mapply
  Module ZPublisher.WSGIPublisher, line 63, in call_object
  Module Products.GenericSetup.browser.components, line 74, in __call__
  Module Products.GenericSetup.browser.components, line 70, in update
  Module Products.GenericSetup.browser.components, line 53, in _setBody
  Module Products.GenericSetup.utils, line 557, in _importBody
  Module Products.GenericSetup.components, line 105, in _importNode
  Module Products.GenericSetup.components, line 350, in _initUtilities
TypeError: __init__() takes at least 6 arguments (1 given)

Nevertheless I found out why this browserlayer is listed here. A few years ago the Site was migrated fom Plone 4.3 to 5.1 and so the browserlayer was never removed but the interface still existed in p.a.widgets < 3 ... now since 3.0.x this got removed.

So I make a custom upgrade step which removes the layer ...