[Pkg-mailman-hackers] Bug#891703: DB user isn't read from setting_local (mailman3-suite.py in /etc)

[Markus Gschwendt]

I'm not sure if this is the same bug.

I get following in the logs:

```
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-
packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", 
line 249, in _legacy_get_response
    response = self._get_response(request)
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", 
line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", 
line 185, in _get_response
    response = wrapped_callback(request, *callback_args,
**callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", 
line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/utils/decorators.py",
line 67, in _wrapper
    return bound_func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-
packages/django/views/decorators/debug.py", line 76, in
sensitive_post_parameters_wrapper
    return view(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/utils/decorators.py",
line 63, in bound_func
    return func.__get__(self, type(self))(*args2, **kwargs2)
  File "/usr/lib/python2.7/dist-packages/allauth/account/views.py",
line 137, in dispatch
    return super(LoginView, self).dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/allauth/account/views.py",
line 80, in dispatch
    **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", 
line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/allauth/account/views.py",
line 103, in post
    response = self.form_valid(form)
  File "/usr/lib/python2.7/dist-packages/allauth/account/views.py",
line 150, in form_valid
    return form.login(self.request, redirect_url=success_url)
  File "/usr/lib/python2.7/dist-packages/allauth/account/forms.py",
line 197, in login
    redirect_url=redirect_url)
  File "/usr/lib/python2.7/dist-packages/allauth/account/utils.py",
line 146, in perform_login
    send_email_confirmation(request, user, signup=signup)
  File "/usr/lib/python2.7/dist-packages/allauth/account/utils.py",
line 323, in send_email_confirmation
    confirm=True)
  File "/usr/lib/python2.7/dist-packages/allauth/account/managers.py",
line 15, in add_email
    user=user, email__iexact=email, defaults={"email": email}
  File "/usr/lib/python2.7/dist-packages/django/db/models/manager.py",
line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/db/models/query.py",
line 466, in get_or_create
    return self._create_object_from_params(lookup, params)
  File "/usr/lib/python2.7/dist-packages/django/db/models/query.py",
line 498, in _create_object_from_params
    obj = self.create(**params)
  File "/usr/lib/python2.7/dist-packages/django/db/models/query.py",
line 394, in create
    obj.save(force_insert=True, using=self.db)
  File "/usr/lib/python2.7/dist-packages/django/db/models/base.py",
line 808, in save
    force_update=force_update, update_fields=update_fields)
  File "/usr/lib/python2.7/dist-packages/django/db/models/base.py",
line 838, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update,
using, update_fields)
  File "/usr/lib/python2.7/dist-packages/django/db/models/base.py",
line 924, in _save_table
    result = self._do_insert(cls._base_manager, using, fields,
update_pk, raw)
  File "/usr/lib/python2.7/dist-packages/django/db/models/base.py",
line 963, in _do_insert
    using=using, raw=raw)
  File "/usr/lib/python2.7/dist-packages/django/db/models/manager.py",
line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/db/models/query.py",
line 1076, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/usr/lib/python2.7/dist-
packages/django/db/models/sql/compiler.py", line 1112, in execute_sql
    cursor.execute(sql, params)
  File "/usr/lib/python2.7/dist-packages/django/db/backends/utils.py",
line 64, in execute
    return self.cursor.execute(sql, params)
  File "/usr/lib/python2.7/dist-packages/django/db/utils.py", line 94,
in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/usr/lib/python2.7/dist-packages/django/db/backends/utils.py",
line 64, in execute
    return self.cursor.execute(sql, params)
  File "/usr/lib/python2.7/dist-
packages/django/db/backends/sqlite3/base.py", line 328, in execute
    return Database.Cursor.execute(self, query, params)
OperationalError: attempt to write a readonly database
```

after changing the owner of the database the error disappears:

chown www-data:www-data /var/lib/mailman3/web/mailman3suite.db.db

as a sidenote:
there are 2 .db files in that directory:

/var/lib/mailman3/web/
0 -rw-r-----  1 www-data www-data 0 Mar 1 19:25 mailman3suite.db
476 -rw-r--r--  1 root root 487424 Mar 1 20:00 mailman3suite.db.db

mailman 3.1.1 stretch-backports
fresh install an new machine