from __future__ import absolute_import import datetime import json import logging import os.path import sys from pip._vendor import lockfile, pkg_resources from pip._vendor.packaging import version as packaging_version from pip._internal.index import PackageFinder from pip._internal.utils.compat import WINDOWS from pip._internal.utils.filesystem import check_path_owner from pip._internal.utils.misc import ensure_dir, get_installed_version SELFCHECK_DATE_FMT = "%Y-%m-%dT%H:%M:%SZ" logger = logging.getLogger(__name__) class SelfCheckState(object): def __init__(self, cache_dir): self.state = {} self.statefile_path = None # Try to load the existing state if cache_dir: self.statefile_path = os.path.join(cache_dir, "selfcheck.json") try: with open(self.statefile_path) as statefile: self.state = json.load(statefile)[sys.prefix] except (IOError, ValueError, KeyError): # Explicitly suppressing exceptions, since we don't want to # error out if the cache file is invalid. pass def save(self, pypi_version, current_time): # If we do not have a path to cache in, don't bother saving. if not self.statefile_path: return # Check to make sure that we own the directory if not check_path_owner(os.path.dirname(self.statefile_path)): return # Now that we've ensured the directory is owned by this user, we'll go # ahead and make sure that all our directories are created. ensure_dir(os.path.dirname(self.statefile_path)) # Attempt to write out our version check file with lockfile.LockFile(self.statefile_path): if os.path.exists(self.statefile_path): with open(self.statefile_path) as statefile: state = json.load(statefile) else: state = {} state[sys.prefix] = { "last_check": current_time.strftime(SELFCHECK_DATE_FMT), "pypi_version": pypi_version, } with open(self.statefile_path, "w") as statefile: json.dump(state, statefile, sort_keys=True, separators=(",", ":")) def was_installed_by_pip(pkg): """Checks whether pkg was installed by pip This is used not to display the upgrade message when pip is in fact installed by system package manager, such as dnf on Fedora. """ try: dist = pkg_resources.get_distribution(pkg) return (dist.has_metadata('INSTALLER') and 'pip' in dist.get_metadata_lines('INSTALLER')) except pkg_resources.DistributionNotFound: return False def pip_version_check(session, options): """Check for an update for pip. Limit the frequency of checks to once per week. State is stored either in the active virtualenv or in the user's USER_CACHE_DIR keyed off the prefix of the pip script path. """ installed_version = get_installed_version("pip") if not installed_version: return pip_version = packaging_version.parse(installed_version) pypi_version = None try: state = SelfCheckState(cache_dir=options.cache_dir) current_time = datetime.datetime.utcnow() # Determine if we need to refresh the state if "last_check" in state.state and "pypi_version" in state.state: last_check = datetime.datetime.strptime( state.state["last_check"], SELFCHECK_DATE_FMT ) if (current_time - last_check).total_seconds() < 7 * 24 * 60 * 60: pypi_version = state.state["pypi_version"] # Refresh the version if we need to or just see if we need to warn if pypi_version is None: # Lets use PackageFinder to see what the latest pip version is finder = PackageFinder( find_links=options.find_links, index_urls=[options.index_url] + options.extra_index_urls, allow_all_prereleases=False, # Explicitly set to False trusted_hosts=options.trusted_hosts, process_dependency_links=options.process_dependency_links, session=session, ) all_candidates = finder.find_all_candidates("pip") if not all_candidates: return pypi_version = str( max(all_candidates, key=lambda c: c.version).version ) # save that we've performed a check state.save(pypi_version, current_time) remote_version = packaging_version.parse(pypi_version) # Determine if our pypi_version is older if (pip_version < remote_version and pip_version.base_version != remote_version.base_version and was_installed_by_pip('pip')): # Advise "python -m pip" on Windows to avoid issues # with overwriting pip.exe. if WINDOWS: pip_cmd = "python -m pip" else: pip_cmd = "pip" logger.warning( "You are using pip version %s, however version %s is " "available.\nYou should consider upgrading via the " "'%s install --upgrade pip' command.", pip_version, pypi_version, pip_cmd ) except Exception: logger.debug( "There was an error checking the latest version of pip", exc_info=True, )