Importing list data

If you have the config.pck file for a version 2.1 mailing list, you can import that into an existing mailing list in Mailman 3.0.

>>> from mailman.testing.documentation import cli
>>> command = cli('mailman.commands.cli_import.import21')

You must specify the mailing list you are importing into, and it must exist.

>>> command('mailman import21')
Usage: ... [OPTIONS] LISTSPEC PICKLE_FILE
Try 'import21 --help' for help.

Error: Missing argument 'LISTSPEC'.

You must also specify a pickle file to import.

>>> command('mailman import21 import@example.com')
Usage: ... [OPTIONS] LISTSPEC PICKLE_FILE
Try 'import21 --help' for help.

Error: Missing argument 'PICKLE_FILE'.

Too bad the list doesn’t exist.

>>> from importlib.resources import path
>>> with path('mailman.testing', 'config.pck') as pickle_path:
...     pickle_file = str(pickle_path)
...     command('mailman import21 import@example.com ' + pickle_file)
Usage: ... [OPTIONS] LISTSPEC PICKLE_FILE
Try 'import21 --help' for help.

Error: No such list: import@example.com

When the mailing list exists, you must specify a real pickle file to import from.

>>> from mailman.app.lifecycle import create_list
>>> mlist = create_list('import@example.com')
>>> from mailman.config import config
>>> transaction = config.db
>>> transaction.commit()
>>> command('mailman import21 import@example.com ' + __file__)
Usage: ... [OPTIONS] LISTSPEC PICKLE_FILE
Try 'import21 --help' for help.

Error: Not a Mailman 2.1 configuration file: .../import.rst'...

Now we can import the test pickle file. As a simple illustration of the import, the mailing list’s “real name” will change.

>>> print(mlist.display_name)
Import

>>> command('mailman import21 import@example.com ' + pickle_file)
Importing ...
>>> print(mlist.display_name)
Test