snapcraft list-plugins --base=core20 fails in a core24 project directory

[mr-cal]

Bug Description

snapcraft list-plugins --base=core20 fails in a core24 project directory

To Reproduce

snapcraft list-plugins --base=core20

Environment

n/a

snapcraft.yaml

name: hello-world
version: "1.0"
summary: test
description: test
confinement: strict
base: core24

parts:
  my-part:
    plugin: nil

Relevant log output

2024-08-29 09:45:43.404 Starting snapcraft, version 8.3.2.post65+git4bbfde2a
2024-08-29 09:45:43.404 Log verbosity level set to BRIEF
2024-08-29 09:45:43.404 Configuring application...
2024-08-29 09:45:43.404 Preparing application...
2024-08-29 09:45:43.405 Build plan: platform=None, build_for=None
2024-08-29 09:45:43.405 Running snapcraft list-plugins on host
2024-08-29 09:45:43.405 snapcraft internal error: LegacyFallback()
2024-08-29 09:45:43.408 Traceback (most recent call last):
2024-08-29 09:45:43.408   File "/snap/snapcraft/12498/lib/python3.10/site-packages/craft_application/application.py", line 538, in run
2024-08-29 09:45:43.408     return_code = dispatcher.run() or os.EX_OK
2024-08-29 09:45:43.408   File "/snap/snapcraft/12498/lib/python3.10/site-packages/craft_cli/dispatcher.py", line 487, in run
2024-08-29 09:45:43.408     return self._loaded_command.run(self._parsed_command_args)
2024-08-29 09:45:43.408   File "/snap/snapcraft/12498/lib/python3.10/site-packages/snapcraft/commands/plugins.py", line 64, in run
2024-08-29 09:45:43.408     raise errors.LegacyFallback()
2024-08-29 09:45:43.408 snapcraft.errors.LegacyFallback
2024-08-29 09:45:43.408 Full execution log: '/home/developer/.local/state/snapcraft/log/snapcraft-20240829-094543.403830.log'

Additional context

This fails because snapcraft raises a LegacyFallback after creating a dispatcher via craft-application:

snapcraft/snapcraft/commands/plugins.py

Lines 62 to 64 in 4bbfde2

	def run(self, parsed_args):
	if parsed_args.base in ("core18", "core20"):
	raise errors.LegacyFallback()

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Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3315.

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