def _load()

in src/buildstream/_project.py [0:0]
54 lines of code
10 McCabe index (conditional complexity)

    def _load(self, *, parent_loader=None, provenance_node=None):

        # Load builtin default
        projectfile = os.path.join(self.directory, _PROJECT_CONF_FILE)
        self._default_config_node = _yaml.load(_site.default_project_config, shortname="projectconfig.yaml")

        # Load project local config and override the builtin
        try:
            self._project_conf = _yaml.load(projectfile, shortname=_PROJECT_CONF_FILE, project=self)
        except LoadError as e:
            # Raise a more specific error here
            if e.reason == LoadErrorReason.MISSING_FILE:
                raise LoadError(str(e), LoadErrorReason.MISSING_PROJECT_CONF) from e

            # Otherwise re-raise the original exception
            raise

        pre_config_node = self._default_config_node.clone()
        self._project_conf._composite(pre_config_node)

        # Assert project's minimum required version early, before validating toplevel keys
        self._validate_version(pre_config_node)

        self._validate_toplevel_node(pre_config_node, first_pass=True)

        # The project name, element path and option declarations
        # are constant and cannot be overridden by option conditional statements
        # FIXME: we should be keeping node information for further composition here
        self.name = self._project_conf.get_str("name")

        # Validate that project name is a valid symbol name
        _assert_symbol_name(self.name, "project name", ref_node=pre_config_node.get_node("name"))

        self.element_path = os.path.join(
            self.directory, self.get_path_from_node(pre_config_node.get_scalar("element-path"), check_is_dir=True)
        )

        self.config.options = OptionPool(self.element_path)
        self.first_pass_config.options = OptionPool(self.element_path)

        defaults = pre_config_node.get_mapping("defaults")
        defaults.validate_keys(["targets"])
        self._default_targets = defaults.get_str_list("targets")

        # Fatal warnings
        self._fatal_warnings = pre_config_node.get_str_list("fatal-warnings", default=[])

        # Junction configuration
        junctions_node = pre_config_node.get_mapping("junctions", default={})
        junctions_node.validate_keys(["duplicates", "internal", "disallow-subproject-uris"])

        if self.junction and self.junction._get_project().disallow_subproject_uris:
            # If the parent project doesn't allow subproject URIs, this must
            # be enforced for nested subprojects as well.
            self.disallow_subproject_uris = True

            # The `disallow-subproject-uris` flag also implies fatal `unaliased-url` in subprojects
            # to ensure no subproject URIs escape the parent project's control.
            if CoreWarnings.UNALIASED_URL not in self._fatal_warnings:
                self._fatal_warnings.append(CoreWarnings.UNALIASED_URL)
        else:
            self.disallow_subproject_uris = junctions_node.get_bool("disallow-subproject-uris", default=False)

        # Parse duplicates
        junction_duplicates = junctions_node.get_mapping("duplicates", default={})
        for project_name, junctions in junction_duplicates.items():
            self._junction_duplicates[project_name] = junctions

        # Parse internal
        self._junction_internal = junctions_node.get_sequence("internal", default=[])

        self.loader = Loader(self, parent=parent_loader, provenance_node=provenance_node)

        self._project_includes = Includes(self.loader, copy_tree=False)

        project_conf_first_pass = self._project_conf.clone()
        self._project_includes.process(project_conf_first_pass, only_local=True, process_project_options=False)
        config_no_include = self._default_config_node.clone()
        project_conf_first_pass._composite(config_no_include)

        # Plugin factories must be defined in project.conf, not included from elsewhere.
        self._load_plugin_factories(config_no_include)

        self._load_pass(config_no_include, self.first_pass_config, ignore_unknown=True)

        # Use separate file for storing source references
        ref_storage_node = pre_config_node.get_scalar("ref-storage")
        self.ref_storage = ref_storage_node.as_str()
        if self.ref_storage not in [ProjectRefStorage.INLINE, ProjectRefStorage.PROJECT_REFS]:
            p = ref_storage_node.get_provenance()
            raise LoadError(
                "{}: Invalid value '{}' specified for ref-storage".format(p, self.ref_storage),
                LoadErrorReason.INVALID_DATA,
            )

        if self.ref_storage == ProjectRefStorage.PROJECT_REFS:
            self.junction_refs.load(self.first_pass_config.options)