Create a small helper class Rhsm, so all the logic related to the
interaction with subscription-manager is grouped there:
- create the Rhsm object in main(), once the initial checks are done
- search subscription-manager as required (so there is no need to
manually check it), and store its path for reuse
- store the common arguments for running subscription-manager
- move run_subscription_manager() to Rhsm as run_repos()
- get rid of the different list parameters: we list only all the
repositories, so the other cases are not needed (and can be added
easily, if needed)
- move get_repository_list() to Rhsm as list_repositories()
The execution of subscription-manager is improved as well:
- pass the arguments to run_command() directly as list, rather than
joining the arguments to string, which run_command() will need to
split again
- move the "repos" parameter directly in run_repos()
- explicitly disable the shell, already off by default
- disable the expansions of variables, as there are none
Adapt the unit test to the different way run_command() is called.
There should be no behaviour changes.
