transaction.py 文件源码

def __new__(cls, origin_url, create_repo=False, pkg_name=None,
            repo_props=EmptyDict, trans_id=None, noexecute=False, xport=None,
            pub=None, progtrack=None):

                scheme, netloc, path, params, query, fragment = \
                    urlparse(origin_url, "http", allow_fragments=0)
                scheme = scheme.lower()

                if noexecute:
                        scheme = "null"
                if scheme != "null" and (not xport or not pub):
                        raise TransactionError("Caller must supply transport "
                            "and publisher.")
                if scheme not in cls.__schemes:
                        raise TransactionRepositoryURLError(origin_url,
                            scheme=scheme)
                if scheme.startswith("http") and not netloc:
                        raise TransactionRepositoryURLError(origin_url,
                            netloc=None)
                if scheme.startswith("file"):
                        if netloc:
                                raise TransactionRepositoryURLError(origin_url,
                                    msg="'{0}' contains host information, which "
                                    "is not supported for filesystem "
                                    "operations.".format(netloc))
                        # as we're urlunparsing below, we need to ensure that
                        # the path starts with only one '/' character, if any
                        # are present
                        if path.startswith("/"):
                                path = "/" + path.lstrip("/")
                        elif not path:
                                raise TransactionRepositoryURLError(origin_url)

                # Rebuild the url with the sanitized components.
                origin_url = urlunparse((scheme, netloc, path, params,
                    query, fragment))

                return cls.__schemes[scheme](origin_url,
                    create_repo=create_repo, pkg_name=pkg_name,
                    repo_props=repo_props, trans_id=trans_id, xport=xport,
                    pub=pub, progtrack=progtrack)