Development: nautobot-server run server does not work using poetry run

[jathanism]

Environment

• Python version:
• Nautobot version: 1.0.0a2

Steps to Reproduce

1. Install nautobot using poetry install
2. Try to run poetry run nautobot-server runserver 0.0.0.0:8000

Expected Behavior

Dev server should start.

Observed Behavior

$ poetry run nautobot-server runserver 0.0.0.0:8000 --insecure
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/jathan/sandbox/src/nautobot/nautobot/core/cli.py", line 55, in main
    run_app(
  File "/Users/jathan/sandbox/src/nautobot/nautobot/core/runner/runner.py", line 268, in run_app
    management.execute_from_command_line([runner_name, command] + command_args)
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/core/management/base.py", line 330, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/core/management/commands/runserver.py", line 61, in execute
    super().execute(*args, **options)
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/core/management/base.py", line 371, in execute
    output = self.handle(*args, **options)
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/core/management/commands/runserver.py", line 96, in handle
    self.run(**options)
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/core/management/commands/runserver.py", line 103, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/utils/autoreload.py", line 620, in run_with_reloader
    exit_code = restart_with_reloader()
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/utils/autoreload.py", line 246, in restart_with_reloader
    args = get_child_arguments()
  File "/Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/lib/python3.9/site-packages/django/utils/autoreload.py", line 233, in get_child_arguments
    raise RuntimeError('Script %s does not exist.' % py_script)
RuntimeError: Script nautobot-server does not exist.

If I run poetry shell first to enter the virtualenv and then follow that with nautobot-server ... it works as expected.

$ poetry shell
Spawning shell within /Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9

$ . /Users/jathan/Library/Caches/pypoetry/virtualenvs/nautobot-b2ttWva6-py3.9/bin/activate

$ nautobot-server runserver 0.0.0.0:8000 --insecure
Performing system checks...

System check identified no issues (0 silenced).
February 24, 2021 - 18:59:51
Django version 3.1.7, using settings 'nautobot_config'
Starting development server at http://0.0.0.0:6789/
Quit the server with CONTROL-C.
nautobot     INFO     Nautobot initialized!

[jathanism]

Hmm this was not yet fixed. I think I must have tagged the wrong ticket.

[jathanism]

The root cause for this is when it attempts to use the auto-reload functionality, it fails because it can't find the root path of the script and determine the files needed to reload on change.

If you pass the --noreload flag, it works:

$ poetry run nautobot-server runserver 0.0.0.0:8000 --insecure --noreload
Performing system checks...

System check identified no issues (0 silenced).
March 19, 2021 - 21:52:21
Django version 3.1.7, using settings 'nautobot_config'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.```

[jathanism]

Related Poetry issue: python-poetry/poetry#2435