Allow molecule drivers to require collections

This change enables drivers to expose the list of required
collections they need for running.

Molecule will display required collections for each driver as part
of `molecule --version` listing.

During 'dependency' run molecule will check for presence of
required collections and install/upgrade them if needed.

.pre-commit-config.yaml

@@ -54,7 +54,7 @@ repos:
         entry: mypy src/
         pass_filenames: false
         additional_dependencies:
-          - ansible-lint>=5.0.10
+          - ansible-lint>=5.1.1
           - packaging
           - enrich>=1.2.5
           - subprocess-tee>=0.2.0
@@ -63,7 +63,7 @@ repos:
     hooks:
       - id: pylint
         additional_dependencies:
-          - ansible-lint>=5.0.10
+          - ansible-lint>=5.1.1
           - enrich>=1.2.5
           - subprocess-tee>=0.2.0
           - testinfra

src/molecule/dependency/ansible_galaxy/base.py

@@ -111,6 +111,7 @@ def bake(self):
         )
 
     def execute(self):
+        super().execute()
         if not self.enabled:
             msg = "Skipping, dependency is disabled."
             LOG.warning(msg)

src/molecule/dependency/base.py

@@ -25,6 +25,8 @@
 import time
 from subprocess import CalledProcessError
 
+from ansiblelint.prerun import require_collection
+
 from molecule import util
 
 LOG = logging.getLogger(__name__)
@@ -88,6 +90,8 @@ def execute(self):  # pragma: no cover
 
         :return: None
         """
+        for name, version in self._config.driver.required_collections.items():
+            require_collection(name, version)
 
     @abc.abstractproperty
     def default_options(self):  # pragma: no cover

src/molecule/dependency/shell.py

@@ -89,6 +89,7 @@ def bake(self) -> None:
         self._sh_command = BakedCommand(cmd=self.command, env=self.env)
 
     def execute(self):
+        super().execute()
         if not self.enabled:
             msg = "Skipping, dependency is disabled."
             LOG.warning(msg)

src/molecule/driver/base.py

@@ -22,6 +22,7 @@
 import abc
 import inspect
 import os
+from typing import Dict
 
 import pkg_resources
 
@@ -295,3 +296,8 @@ def reset(self):
         by molecule, regardless the scenario name.  Molecule will use metadata
         like labels or tags to annotate resources allocated by it.
         """
+
+    @property
+    def required_collections(self) -> Dict[str, str]:
+        """Return collections dict containing names and versions required."""
+        return {}

src/molecule/shell.py

@@ -64,6 +64,10 @@ def print_version(ctx, param, value):
     )
     for driver in drivers():
         msg += f"\n    [repr.attrib_name]{str(driver)}[/][dim]:[/][repr.number]{driver.version}[/][dim] from {driver.module}[/]"
+        if driver.required_collections:
+            msg += " requiring collections:"
+            for name, version in driver.required_collections.items():
+                msg += f" {name}>={version}"
     console.print(msg)
 
     ctx.exit()