def _map_roles_to_roles()

in util/parsefiles.py [0:0]

• 15 lines of code
• 19 McCabe index (conditional complexity)

def _map_roles_to_roles(graph, dirs, git_dir, key, type_1, type_2):
    """
    Maps roles to the roles that they depend on.

    Input:
    graph: A networkx digraph that is used to map Ansible dependencies.
    dirs: A list of relative paths to directories in which Ansible roles reside.
    git_dir: A path to the top-most directory in the local git repository tool is to be run in.
    key: The key in a role yaml file in dirs that maps to relevant role data. In this case, key is
        "dependencies", because a role's dependent roles is of interest.
    type_1: Given edges A-B, the type of node A.
    type_2: Given edges A-B, the type of node B.
        Since this function maps roles to their dependent roles, both type_1 and type_2 are "role".
    """

    Node = namedtuple('Node', ['name', 'type'])

    # for each role directory
    for d in dirs:
        d = pathlib2.Path(git_dir, d)

        # for all files/sub-directories in directory
        for item in d.iterdir():

            # attempts to find meta/*.yml file in item directory tree
            roles = {f for f in item.glob("meta/*.yml")}

            # if a meta/*.yml file(s) exists for a role
            if roles:
                # for each role
                for role in roles:
                    yaml_file = _open_yaml_file(role)

                    # if not an empty yaml file and key in file
                    if yaml_file is not None and key in yaml_file:
                        # for each dependent role; yaml_file["dependencies"] returns list of
                        # dependent roles
                        for dependent in yaml_file[key]:
                            # get role name of each dependent role
                            name = _get_role_name(dependent)

                            # add node for type_1, typically role
                            node_1 = Node(item.name, type_1)

                            # add node for type_2, typically dependent role
                            node_2 = Node(name, type_2)

                            # add edge, typically dependent role - role
                            graph.add_edge(node_2, node_1)