Snactor: add command to show dependencies between actors

[MichalHe]

Adds a new command show-dependencies <workflow> that displays all producer/consumer dependencies in the workflow. The output of the command is in the DOT language that allows easy visualization of graphs.

Example use:

# snactor show-dependencies WORKFLOW > deps.dot
# xdot deps.dot

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[pirat89]

# snactor show-dependencies IPUConfig
Traceback (most recent call last):
  File "/usr/bin/snactor", line 11, in <module>
    load_entry_point('leapp==0.18.0', 'console_scripts', 'snactor')()
  File "/usr/lib/python3.6/site-packages/leapp/snactor/__init__.py", line 79, in main
    cli.command.execute(version=_('snactor version {}').format(VERSION))
  File "/usr/lib/python3.6/site-packages/leapp/utils/clicmd.py", line 111, in execute
    args.func(args)
  File "/usr/lib/python3.6/site-packages/leapp/utils/clicmd.py", line 133, in called
    self.target(args)
  File "/usr/lib/python3.6/site-packages/leapp/utils/repository.py", line 20, in checker
    return f(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/leapp/snactor/context.py", line 34, in wrapper
    return f(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/leapp/snactor/commands/show_dependencies.py", line 36, in cli
    raise CommandError('Could not find any workflow named "{}"'.format(params.name))
AttributeError: 'Namespace' object has no attribute 'name'

Possibly workflow_name?

[MichalHe]

Thank you, should be fixed (untested, will test in a moment).

[pirat89]

@MichalHe thinking about the current implementation, it seems to me that it would fit more as sub-command for the workflow command, like:

$ snactor workflow show-dependencies

as snactor (and leapp) can works also without workflows at all, but currently it's connected strictly to workflow. If we want to have it as the main command, I would expect maybe something like this:

snactor show-dependencies  # nothing else - print dependencies for all actors discovered in the leapp repository
snactor show-dependencies --all # cover also actors in referenced repositories
snactor show-dependencies --workflow <WORKFLOW>  # like --all but filter everything based on the specified workflow

wdyt?

[MichalHe]

@pirat89 You are right with having a subcommand of workflow would be better. I will move the code into the workflow command.

What I also wish to do is to collect actors from multiple repositories, not just the repository defined at ., because this feature is a bit useless if the actor I am developing lives in el8to9, but all of its dependencies are in common. Perhaps, is there a part of snactor's codebase that I could use as an example?