`from_file` - JSON file of repo definitions
        `noop` - Boolean, if true don't actually create/update repos, just show what would have happened

def import_repo(self, from_file, noop=False, query='/repositories/'):
        """
        `from_file` - JSON file of repo definitions
        `noop` - Boolean, if true don't actually create/update repos, just show what would have happened
        """
        try:
            repo_defs = juicer.utils.ValidateRepoDef.validate_document(from_file)
        except JuicerRepoDefError, e:
            juicer.utils.Log.log_error("Could not load repo defs from %s:" % from_file)
            raise e
        else:
            juicer.utils.Log.log_debug("Loaded and validated repo defs from %s" % from_file)

        # All our known envs, for cases where no value is supplied for 'env'
        all_envs = juicer.utils.get_environments()

        # Repos to create/update, sorted by environment.
        repo_objects_create = []
        repo_objects_update = {}
        for env in all_envs:
            repo_objects_update[env] = []

        # All repo defs as Repo objects
        all_repos = [JuicerRepo(repo['name'], repo_def=repo) for repo in repo_defs]

        # Detailed information on all existing repos
        existing_repos = {}
        repo_pool = ThreadPool()

        # Parallelize getting the repo lists
        env_results = [repo_pool.apply_async(self.list_repos, tuple(), kwds={'envs': [er]}, callback=existing_repos.update) for er in all_envs]
        repo_pool.close()

        for result_async in env_results:
            result_async.wait()

        repo_pool.join()

        for repo in all_repos:
            # 'env' is all environments if: 'env' is not defined; 'env' is an empty list
            current_env = repo.get('env', [])
            if current_env == []:
                juicer.utils.Log.log_debug("Setting 'env' to all_envs for repo: %s" % repo['name'])
                repo['env'] = all_envs

        #  Assemble a set of all specified environments.
        defined_envs = juicer.utils.unique_repo_def_envs(all_repos)
        juicer.utils.Log.log_notice("Discovered environments: %s" % ", ".join(list(defined_envs)))

        widgets = [
            "Importing: ",
            progressbar.Percentage(),
            " ",
            "(",
            progressbar.SimpleProgress(),
            ") ",
            progressbar.ETA()
        ]
        progress_bar = JuiceBar(len(all_repos), widgets)
        repos_processed = juicer.admin.ThreaddedQuery.LookupObject()
        repos_processed.processed = 0
        # sort out new vs. existing
        # Break these into batches we can process at once
        for chunks in juicer.utils.chunks(all_repos, multiprocessing.cpu_count() - 1):
            crud_pool = ThreadPool()
            crud_args = (all_repos, all_envs, existing_repos, self, repo_objects_create, repo_objects_update, repos_processed, progress_bar)
            calculate_results = [crud_pool.apply_async(juicer.admin.ThreaddedQuery.calculate_create_and_update,
                                                       crud_args,
                                                       kwds={'repo': repo},
                                                       callback=juicer.admin.ThreaddedQuery.crud_progress_updater)
                                 for repo in chunks]
            crud_pool.close()
            to_process = len(calculate_results)
            juicer.utils.Log.log_debug("And we started the pool; items: %s" % len(calculate_results))
            while to_process > 0:
                for thingy in calculate_results:
                    thingy.wait(0.5)
                    if thingy.ready():
                        to_process -= 1
            crud_pool.join()

        juicer.utils.Log.log_debug("And we joined all threads")
        """repo_objects_update looks like this:

        {'environment': [repo_update_spec, ...]}

        repo_update_spec :: [env, repo_diff_spec, pulp_repo]

        env :: environment to apply diff to

        repo_diff_spec :: {
            'distributor': {'distributor_config': {PARAMETERS_TO_UPDATE: VALUES}},
            'importer': {'importer_config': {PARAMETERS_TO_UPDATE: VALUES}
            }
        }

        pulp_repo :: Json serialization of a repo as returned from pulp (or juicer-admin repo show --json)
        """
        return (repo_objects_create, repo_objects_update)