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"""Package resource API -------------------- A resource is a logical file contained within a package, or a logical subdirectory thereof. The package resource API expects resource names to have their path parts separated with ``/``, *not* whatever the local path separator is. Do not use os.path operations to manipulate resource names being passed into the API. The package resource API is designed to work with normal filesystem packages, .egg files, and unpacked .egg files. It can also work in a limited way with .zip files and with custom PEP 302 loaders that support the ``get_data()`` method. """ import sys, os, time, re, imp, types, zipfile, zipimport import warnings import stat try: from urlparse import urlparse, urlunparse except ImportError: from urllib.parse import urlparse, urlunparse try: frozenset except NameError: from sets import ImmutableSet as frozenset try: basestring next = lambda o: o.next() from cStringIO import StringIO as BytesIO def exec_(code, globs=None, locs=None): if globs is None: frame = sys._getframe(1) globs = frame.f_globals if locs is None: locs = frame.f_locals del frame elif locs is None: locs = globs exec("""exec code in globs, locs""") except NameError: basestring = str from io import BytesIO exec_ = eval("exec") def execfile(fn, globs=None, locs=None): if globs is None: globs = globals() if locs is None: locs = globs exec_(compile(open(fn).read(), fn, 'exec'), globs, locs) import functools reduce = functools.reduce # capture these to bypass sandboxing from os import utime try: from os import mkdir, rename, unlink WRITE_SUPPORT = True except ImportError: # no write support, probably under GAE WRITE_SUPPORT = False from os import open as os_open from os.path import isdir, split # Avoid try/except due to potential problems with delayed import mechanisms. if sys.version_info >= (3, 3) and sys.implementation.name == "cpython": import importlib._bootstrap as importlib_bootstrap else: importlib_bootstrap = None try: import parser except ImportError: pass def _bypass_ensure_directory(name, mode=0x1FF): # 0777 # Sandbox-bypassing version of ensure_directory() if not WRITE_SUPPORT: raise IOError('"os.mkdir" not supported on this platform.') dirname, filename = split(name) if dirname and filename and not isdir(dirname): _bypass_ensure_directory(dirname) mkdir(dirname, mode) _state_vars = {} def _declare_state(vartype, **kw): g = globals() for name, val in kw.items(): g[name] = val _state_vars[name] = vartype def __getstate__(): state = {} g = globals() for k, v in _state_vars.items(): state[k] = g['_sget_'+v](g[k]) return state def __setstate__(state): g = globals() for k, v in state.items(): g['_sset_'+_state_vars[k]](k, g[k], v) return state def _sget_dict(val): return val.copy() def _sset_dict(key, ob, state): ob.clear() ob.update(state) def _sget_object(val): return val.__getstate__() def _sset_object(key, ob, state): ob.__setstate__(state) _sget_none = _sset_none = lambda *args: None def get_supported_platform(): """Return this platform's maximum compatible version. distutils.util.get_platform() normally reports the minimum version of Mac OS X that would be required to *use* extensions produced by distutils. But what we want when checking compatibility is to know the version of Mac OS X that we are *running*. To allow usage of packages that explicitly require a newer version of Mac OS X, we must also know the current version of the OS. If this condition occurs for any other platform with a version in its platform strings, this function should be extended accordingly. """ plat = get_build_platform(); m = macosVersionString.match(plat) if m is not None and sys.platform == "darwin": try: plat = 'macosx-%s-%s' % ('.'.join(_macosx_vers()[:2]), m.group(3)) except ValueError: pass # not Mac OS X return plat __all__ = [ # Basic resource access and distribution/entry point discovery 'require', 'run_script', 'get_provider', 'get_distribution', 'load_entry_point', 'get_entry_map', 'get_entry_info', 'iter_entry_points', 'resource_string', 'resource_stream', 'resource_filename', 'resource_listdir', 'resource_exists', 'resource_isdir', # Environmental control 'declare_namespace', 'working_set', 'add_activation_listener', 'find_distributions', 'set_extraction_path', 'cleanup_resources', 'get_default_cache', # Primary implementation classes 'Environment', 'WorkingSet', 'ResourceManager', 'Distribution', 'Requirement', 'EntryPoint', # Exceptions 'ResolutionError','VersionConflict','DistributionNotFound','UnknownExtra', 'ExtractionError', # Parsing functions and string utilities 'parse_requirements', 'parse_version', 'safe_name', 'safe_version', 'get_platform', 'compatible_platforms', 'yield_lines', 'split_sections', 'safe_extra', 'to_filename', 'invalid_marker', 'evaluate_marker', # filesystem utilities 'ensure_directory', 'normalize_path', # Distribution "precedence" constants 'EGG_DIST', 'BINARY_DIST', 'SOURCE_DIST', 'CHECKOUT_DIST', 'DEVELOP_DIST', # "Provider" interfaces, implementations, and registration/lookup APIs 'IMetadataProvider', 'IResourceProvider', 'FileMetadata', 'PathMetadata', 'EggMetadata', 'EmptyProvider', 'empty_provider', 'NullProvider', 'EggProvider', 'DefaultProvider', 'ZipProvider', 'register_finder', 'register_namespace_handler', 'register_loader_type', 'fixup_namespace_packages', 'get_importer', # Deprecated/backward compatibility only 'run_main', 'AvailableDistributions', ] class ResolutionError(Exception): """Abstract base for dependency resolution errors""" def __repr__(self): return self.__class__.__name__+repr(self.args) class VersionConflict(ResolutionError): """An already-installed version conflicts with the requested version""" class DistributionNotFound(ResolutionError): """A requested distribution was not found""" class UnknownExtra(ResolutionError): """Distribution doesn't have an "extra feature" of the given name""" _provider_factories = {} PY_MAJOR = sys.version[:3] EGG_DIST = 3 BINARY_DIST = 2 SOURCE_DIST = 1 CHECKOUT_DIST = 0 DEVELOP_DIST = -1 def register_loader_type(loader_type, provider_factory): """Register `provider_factory` to make providers for `loader_type` `loader_type` is the type or class of a PEP 302 ``module.__loader__``, and `provider_factory` is a function that, passed a *module* object, returns an ``IResourceProvider`` for that module. """ _provider_factories[loader_type] = provider_factory def get_provider(moduleOrReq): """Return an IResourceProvider for the named module or requirement""" if isinstance(moduleOrReq,Requirement): return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0] try: module = sys.modules[moduleOrReq] except KeyError: __import__(moduleOrReq) module = sys.modules[moduleOrReq] loader = getattr(module, '__loader__', None) return _find_adapter(_provider_factories, loader)(module) def _macosx_vers(_cache=[]): if not _cache: import platform version = platform.mac_ver()[0] # fallback for MacPorts if version == '': import plistlib plist = '/System/Library/CoreServices/SystemVersion.plist' if os.path.exists(plist): if hasattr(plistlib, 'readPlist'): plist_content = plistlib.readPlist(plist) if 'ProductVersion' in plist_content: version = plist_content['ProductVersion'] _cache.append(version.split('.')) return _cache[0] def _macosx_arch(machine): return {'PowerPC':'ppc', 'Power_Macintosh':'ppc'}.get(machine,machine) def get_build_platform(): """Return this platform's string for platform-specific distributions XXX Currently this is the same as ``distutils.util.get_platform()``, but it needs some hacks for Linux and Mac OS X. """ try: # Python 2.7 or >=3.2 from sysconfig import get_platform except ImportError: from distutils.util import get_platform plat = get_platform() if sys.platform == "darwin" and not plat.startswith('macosx-'): try: version = _macosx_vers() machine = os.uname()[4].replace(" ", "_") return "macosx-%d.%d-%s" % (int(version[0]), int(version[1]), _macosx_arch(machine)) except ValueError: # if someone is running a non-Mac darwin system, this will fall # through to the default implementation pass return plat macosVersionString = re.compile(r"macosx-(\d+)\.(\d+)-(.*)") darwinVersionString = re.compile(r"darwin-(\d+)\.(\d+)\.(\d+)-(.*)") get_platform = get_build_platform # XXX backward compat def compatible_platforms(provided,required): """Can code for the `provided` platform run on the `required` platform? Returns true if either platform is ``None``, or the platforms are equal. XXX Needs compatibility checks for Linux and other unixy OSes. """ if provided is None or required is None or provided==required: return True # easy case # Mac OS X special cases reqMac = macosVersionString.match(required) if reqMac: provMac = macosVersionString.match(provided) # is this a Mac package? if not provMac: # this is backwards compatibility for packages built before # setuptools 0.6. All packages built after this point will # use the new macosx designation. provDarwin = darwinVersionString.match(provided) if provDarwin: dversion = int(provDarwin.group(1)) macosversion = "%s.%s" % (reqMac.group(1), reqMac.group(2)) if dversion == 7 and macosversion >= "10.3" or \ dversion == 8 and macosversion >= "10.4": #import warnings #warnings.warn("Mac eggs should be rebuilt to " # "use the macosx designation instead of darwin.", # category=DeprecationWarning) return True return False # egg isn't macosx or legacy darwin # are they the same major version and machine type? if provMac.group(1) != reqMac.group(1) or \ provMac.group(3) != reqMac.group(3): return False # is the required OS major update >= the provided one? if int(provMac.group(2)) > int(reqMac.group(2)): return False return True # XXX Linux and other platforms' special cases should go here return False def run_script(dist_spec, script_name): """Locate distribution `dist_spec` and run its `script_name` script""" ns = sys._getframe(1).f_globals name = ns['__name__'] ns.clear() ns['__name__'] = name require(dist_spec)[0].run_script(script_name, ns) run_main = run_script # backward compatibility def get_distribution(dist): """Return a current distribution object for a Requirement or string""" if isinstance(dist,basestring): dist = Requirement.parse(dist) if isinstance(dist,Requirement): dist = get_provider(dist) if not isinstance(dist,Distribution): raise TypeError("Expected string, Requirement, or Distribution", dist) return dist def load_entry_point(dist, group, name): """Return `name` entry point of `group` for `dist` or raise ImportError""" return get_distribution(dist).load_entry_point(group, name) def get_entry_map(dist, group=None): """Return the entry point map for `group`, or the full entry map""" return get_distribution(dist).get_entry_map(group) def get_entry_info(dist, group, name): """Return the EntryPoint object for `group`+`name`, or ``None``""" return get_distribution(dist).get_entry_info(group, name) class IMetadataProvider: def has_metadata(name): """Does the package's distribution contain the named metadata?""" def get_metadata(name): """The named metadata resource as a string""" def get_metadata_lines(name): """Yield named metadata resource as list of non-blank non-comment lines Leading and trailing whitespace is stripped from each line, and lines with ``#`` as the first non-blank character are omitted.""" def metadata_isdir(name): """Is the named metadata a directory? (like ``os.path.isdir()``)""" def metadata_listdir(name): """List of metadata names in the directory (like ``os.listdir()``)""" def run_script(script_name, namespace): """Execute the named script in the supplied namespace dictionary""" class IResourceProvider(IMetadataProvider): """An object that provides access to package resources""" def get_resource_filename(manager, resource_name): """Return a true filesystem path for `resource_name` `manager` must be an ``IResourceManager``""" def get_resource_stream(manager, resource_name): """Return a readable file-like object for `resource_name` `manager` must be an ``IResourceManager``""" def get_resource_string(manager, resource_name): """Return a string containing the contents of `resource_name` `manager` must be an ``IResourceManager``""" def has_resource(resource_name): """Does the package contain the named resource?""" def resource_isdir(resource_name): """Is the named resource a directory? (like ``os.path.isdir()``)""" def resource_listdir(resource_name): """List of resource names in the directory (like ``os.listdir()``)""" class WorkingSet(object): """A collection of active distributions on sys.path (or a similar list)""" def __init__(self, entries=None): """Create working set from list of path entries (default=sys.path)""" self.entries = [] self.entry_keys = {} self.by_key = {} self.callbacks = [] if entries is None: entries = sys.path for entry in entries: self.add_entry(entry) def add_entry(self, entry): """Add a path item to ``.entries``, finding any distributions on it ``find_distributions(entry, True)`` is used to find distributions corresponding to the path entry, and they are added. `entry` is always appended to ``.entries``, even if it is already present. (This is because ``sys.path`` can contain the same value more than once, and the ``.entries`` of the ``sys.path`` WorkingSet should always equal ``sys.path``.) """ self.entry_keys.setdefault(entry, []) self.entries.append(entry) for dist in find_distributions(entry, True): self.add(dist, entry, False) def __contains__(self,dist): """True if `dist` is the active distribution for its project""" return self.by_key.get(dist.key) == dist def find(self, req): """Find a distribution matching requirement `req` If there is an active distribution for the requested project, this returns it as long as it meets the version requirement specified by `req`. But, if there is an active distribution for the project and it does *not* meet the `req` requirement, ``VersionConflict`` is raised. If there is no active distribution for the requested project, ``None`` is returned. """ dist = self.by_key.get(req.key) if dist is not None and dist not in req: raise VersionConflict(dist,req) # XXX add more info else: return dist def iter_entry_points(self, group, name=None): """Yield entry point objects from `group` matching `name` If `name` is None, yields all entry points in `group` from all distributions in the working set, otherwise only ones matching both `group` and `name` are yielded (in distribution order). """ for dist in self: entries = dist.get_entry_map(group) if name is None: for ep in entries.values(): yield ep elif name in entries: yield entries[name] def run_script(self, requires, script_name): """Locate distribution for `requires` and run `script_name` script""" ns = sys._getframe(1).f_globals name = ns['__name__'] ns.clear() ns['__name__'] = name self.require(requires)[0].run_script(script_name, ns) def __iter__(self): """Yield distributions for non-duplicate projects in the working set The yield order is the order in which the items' path entries were added to the working set. """ seen = {} for item in self.entries: if item not in self.entry_keys: # workaround a cache issue continue for key in self.entry_keys[item]: if key not in seen: seen[key]=1 yield self.by_key[key] def add(self, dist, entry=None, insert=True): """Add `dist` to working set, associated with `entry` If `entry` is unspecified, it defaults to the ``.location`` of `dist`. On exit from this routine, `entry` is added to the end of the working set's ``.entries`` (if it wasn't already present). `dist` is only added to the working set if it's for a project that doesn't already have a distribution in the set. If it's added, any callbacks registered with the ``subscribe()`` method will be called. """ if insert: dist.insert_on(self.entries, entry) if entry is None: entry = dist.location keys = self.entry_keys.setdefault(entry,[]) keys2 = self.entry_keys.setdefault(dist.location,[]) if dist.key in self.by_key: return # ignore hidden distros self.by_key[dist.key] = dist if dist.key not in keys: keys.append(dist.key) if dist.key not in keys2: keys2.append(dist.key) self._added_new(dist) def resolve(self, requirements, env=None, installer=None): """List all distributions needed to (recursively) meet `requirements` `requirements` must be a sequence of ``Requirement`` objects. `env`, if supplied, should be an ``Environment`` instance. If not supplied, it defaults to all distributions available within any entry or distribution in the working set. `installer`, if supplied, will be invoked with each requirement that cannot be met by an already-installed distribution; it should return a ``Distribution`` or ``None``. """ requirements = list(requirements)[::-1] # set up the stack processed = {} # set of processed requirements best = {} # key -> dist to_activate = [] while requirements: req = requirements.pop(0) # process dependencies breadth-first if req in processed: # Ignore cyclic or redundant dependencies continue dist = best.get(req.key) if dist is None: # Find the best distribution and add it to the map dist = self.by_key.get(req.key) if dist is None: if env is None: env = Environment(self.entries) dist = best[req.key] = env.best_match(req, self, installer) if dist is None: #msg = ("The '%s' distribution was not found on this " # "system, and is required by this application.") #raise DistributionNotFound(msg % req) # unfortunately, zc.buildout uses a str(err) # to get the name of the distribution here.. raise DistributionNotFound(req) to_activate.append(dist) if dist not in req: # Oops, the "best" so far conflicts with a dependency raise VersionConflict(dist,req) # XXX put more info here requirements.extend(dist.requires(req.extras)[::-1]) processed[req] = True return to_activate # return list of distros to activate def find_plugins(self, plugin_env, full_env=None, installer=None, fallback=True ): """Find all activatable distributions in `plugin_env` Example usage:: distributions, errors = working_set.find_plugins( Environment(plugin_dirlist) ) map(working_set.add, distributions) # add plugins+libs to sys.path print 'Could not load', errors # display errors The `plugin_env` should be an ``Environment`` instance that contains only distributions that are in the project's "plugin directory" or directories. The `full_env`, if supplied, should be an ``Environment`` contains all currently-available distributions. If `full_env` is not supplied, one is created automatically from the ``WorkingSet`` this method is called on, which will typically mean that every directory on ``sys.path`` will be scanned for distributions. `installer` is a standard installer callback as used by the ``resolve()`` method. The `fallback` flag indicates whether we should attempt to resolve older versions of a plugin if the newest version cannot be resolved. This method returns a 2-tuple: (`distributions`, `error_info`), where `distributions` is a list of the distributions found in `plugin_env` that were loadable, along with any other distributions that are needed to resolve their dependencies. `error_info` is a dictionary mapping unloadable plugin distributions to an exception instance describing the error that occurred. Usually this will be a ``DistributionNotFound`` or ``VersionConflict`` instance. """ plugin_projects = list(plugin_env) plugin_projects.sort() # scan project names in alphabetic order error_info = {} distributions = {} if full_env is None: env = Environment(self.entries) env += plugin_env else: env = full_env + plugin_env shadow_set = self.__class__([]) list(map(shadow_set.add, self)) # put all our entries in shadow_set for project_name in plugin_projects: for dist in plugin_env[project_name]: req = [dist.as_requirement()] try: resolvees = shadow_set.resolve(req, env, installer) except ResolutionError: v = sys.exc_info()[1] error_info[dist] = v # save error info if fallback: continue # try the next older version of project else: break # give up on this project, keep going else: list(map(shadow_set.add, resolvees)) distributions.update(dict.fromkeys(resolvees)) # success, no need to try any more versions of this project break distributions = list(distributions) distributions.sort() return distributions, error_info def require(self, *requirements): """Ensure that distributions matching `requirements` are activated `requirements` must be a string or a (possibly-nested) sequence thereof, specifying the distributions and versions required. The return value is a sequence of the distributions that needed to be activated to fulfill the requirements; all relevant distributions are included, even if they were already activated in this working set. """ needed = self.resolve(parse_requirements(requirements)) for dist in needed: self.add(dist) return needed def subscribe(self, callback): """Invoke `callback` for all distributions (including existing ones)""" if callback in self.callbacks: return self.callbacks.append(callback) for dist in self: callback(dist) def _added_new(self, dist): for callback in self.callbacks: callback(dist) def __getstate__(self): return ( self.entries[:], self.entry_keys.copy(), self.by_key.copy(), self.callbacks[:] ) def __setstate__(self, e_k_b_c): entries, keys, by_key, callbacks = e_k_b_c self.entries = entries[:] self.entry_keys = keys.copy() self.by_key = by_key.copy() self.callbacks = callbacks[:] class Environment(object): """Searchable snapshot of distributions on a search path""" def __init__(self, search_path=None, platform=get_supported_platform(), python=PY_MAJOR): """Snapshot distributions available on a search path Any distributions found on `search_path` are added to the environment. `search_path` should be a sequence of ``sys.path`` items. If not supplied, ``sys.path`` is used. `platform` is an optional string specifying the name of the platform that platform-specific distributions must be compatible with. If unspecified, it defaults to the current platform. `python` is an optional string naming the desired version of Python (e.g. ``'2.4'``); it defaults to the current version. You may explicitly set `platform` (and/or `python`) to ``None`` if you wish to map *all* distributions, not just those compatible with the running platform or Python version. """ self._distmap = {} self._cache = {} self.platform = platform self.python = python self.scan(search_path) def can_add(self, dist): """Is distribution `dist` acceptable for this environment? The distribution must match the platform and python version requirements specified when this environment was created, or False is returned. """ return (self.python is None or dist.py_version is None or dist.py_version==self.python) \ and compatible_platforms(dist.platform,self.platform) def remove(self, dist): """Remove `dist` from the environment""" self._distmap[dist.key].remove(dist) def scan(self, search_path=None): """Scan `search_path` for distributions usable in this environment Any distributions found are added to the environment. `search_path` should be a sequence of ``sys.path`` items. If not supplied, ``sys.path`` is used. Only distributions conforming to the platform/python version defined at initialization are added. """ if search_path is None: search_path = sys.path for item in search_path: for dist in find_distributions(item): self.add(dist) def __getitem__(self,project_name): """Return a newest-to-oldest list of distributions for `project_name` """ try: return self._cache[project_name] except KeyError: project_name = project_name.lower() if project_name not in self._distmap: return [] if project_name not in self._cache: dists = self._cache[project_name] = self._distmap[project_name] _sort_dists(dists) return self._cache[project_name] def add(self,dist): """Add `dist` if we ``can_add()`` it and it isn't already added""" if self.can_add(dist) and dist.has_version(): dists = self._distmap.setdefault(dist.key,[]) if dist not in dists: dists.append(dist) if dist.key in self._cache: _sort_dists(self._cache[dist.key]) def best_match(self, req, working_set, installer=None): """Find distribution best matching `req` and usable on `working_set` This calls the ``find(req)`` method of the `working_set` to see if a suitable distribution is already active. (This may raise ``VersionConflict`` if an unsuitable version of the project is already active in the specified `working_set`.) If a suitable distribution isn't active, this method returns the newest distribution in the environment that meets the ``Requirement`` in `req`. If no suitable distribution is found, and `installer` is supplied, then the result of calling the environment's ``obtain(req, installer)`` method will be returned. """ dist = working_set.find(req) if dist is not None: return dist for dist in self[req.key]: if dist in req: return dist return self.obtain(req, installer) # try and download/install def obtain(self, requirement, installer=None): """Obtain a distribution matching `requirement` (e.g. via download) Obtain a distro that matches requirement (e.g. via download). In the base ``Environment`` class, this routine just returns ``installer(requirement)``, unless `installer` is None, in which case None is returned instead. This method is a hook that allows subclasses to attempt other ways of obtaining a distribution before falling back to the `installer` argument.""" if installer is not None: return installer(requirement) def __iter__(self): """Yield the unique project names of the available distributions""" for key in self._distmap.keys(): if self[key]: yield key def __iadd__(self, other): """In-place addition of a distribution or environment""" if isinstance(other,Distribution): self.add(other) elif isinstance(other,Environment): for project in other: for dist in other[project]: self.add(dist) else: raise TypeError("Can't add %r to environment" % (other,)) return self def __add__(self, other): """Add an environment or distribution to an environment""" new = self.__class__([], platform=None, python=None) for env in self, other: new += env return new AvailableDistributions = Environment # XXX backward compatibility class ExtractionError(RuntimeError): """An error occurred extracting a resource The following attributes are available from instances of this exception: manager The resource manager that raised this exception cache_path The base directory for resource extraction original_error The exception instance that caused extraction to fail """ class ResourceManager: """Manage resource extraction and packages""" extraction_path = None def __init__(self): self.cached_files = {} def resource_exists(self, package_or_requirement, resource_name): """Does the named resource exist?""" return get_provider(package_or_requirement).has_resource(resource_name) def resource_isdir(self, package_or_requirement, resource_name): """Is the named resource an existing directory?""" return get_provider(package_or_requirement).resource_isdir( resource_name ) def resource_filename(self, package_or_requirement, resource_name): """Return a true filesystem path for specified resource""" return get_provider(package_or_requirement).get_resource_filename( self, resource_name ) def resource_stream(self, package_or_requirement, resource_name): """Return a readable file-like object for specified resource""" return get_provider(package_or_requirement).get_resource_stream( self, resource_name ) def resource_string(self, package_or_requirement, resource_name): """Return specified resource as a string""" return get_provider(package_or_requirement).get_resource_string( self, resource_name ) def resource_listdir(self, package_or_requirement, resource_name): """List the contents of the named resource directory""" return get_provider(package_or_requirement).resource_listdir( resource_name ) def extraction_error(self): """Give an error message for problems extracting file(s)""" old_exc = sys.exc_info()[1] cache_path = self.extraction_path or get_default_cache() err = ExtractionError("""Can't extract file(s) to egg cache The following error occurred while trying to extract file(s) to the Python egg cache: %s The Python egg cache directory is currently set to: %s Perhaps your account does not have write access to this directory? You can change the cache directory by setting the PYTHON_EGG_CACHE environment variable to point to an accessible directory. """ % (old_exc, cache_path) ) err.manager = self err.cache_path = cache_path err.original_error = old_exc raise err def get_cache_path(self, archive_name, names=()): """Return absolute location in cache for `archive_name` and `names` The parent directory of the resulting path will be created if it does not already exist. `archive_name` should be the base filename of the enclosing egg (which may not be the name of the enclosing zipfile!), including its ".egg" extension. `names`, if provided, should be a sequence of path name parts "under" the egg's extraction location. This method should only be called by resource providers that need to obtain an extraction location, and only for names they intend to extract, as it tracks the generated names for possible cleanup later. """ extract_path = self.extraction_path or get_default_cache() target_path = os.path.join(extract_path, archive_name+'-tmp', *names) try: _bypass_ensure_directory(target_path) except: self.extraction_error() self._warn_unsafe_extraction_path(extract_path) self.cached_files[target_path] = 1 return target_path @staticmethod def _warn_unsafe_extraction_path(path): """ If the default extraction path is overridden and set to an insecure location, such as /tmp, it opens up an opportunity for an attacker to replace an extracted file with an unauthorized payload. Warn the user if a known insecure location is used. See Distribute #375 for more details. """ if os.name == 'nt' and not path.startswith(os.environ['windir']): # On Windows, permissions are generally restrictive by default # and temp directories are not writable by other users, so # bypass the warning. return mode = os.stat(path).st_mode if mode & stat.S_IWOTH or mode & stat.S_IWGRP: msg = ("%s is writable by group/others and vulnerable to attack " "when " "used with get_resource_filename. Consider a more secure " "location (set with .set_extraction_path or the " "PYTHON_EGG_CACHE environment variable)." % path) warnings.warn(msg, UserWarning) def postprocess(self, tempname, filename): """Perform any platform-specific postprocessing of `tempname` This is where Mac header rewrites should be done; other platforms don't have anything special they should do. Resource providers should call this method ONLY after successfully extracting a compressed resource. They must NOT call it on resources that are already in the filesystem. `tempname` is the current (temporary) name of the file, and `filename` is the name it will be renamed to by the caller after this routine returns. """ if os.name == 'posix': # Make the resource executable mode = ((os.stat(tempname).st_mode) | 0x16D) & 0xFFF # 0555, 07777 os.chmod(tempname, mode) def set_extraction_path(self, path): """Set the base path where resources will be extracted to, if needed. If you do not call this routine before any extractions take place, the path defaults to the return value of ``get_default_cache()``. (Which is based on the ``PYTHON_EGG_CACHE`` environment variable, with various platform-specific fallbacks. See that routine's documentation for more details.) Resources are extracted to subdirectories of this path based upon information given by the ``IResourceProvider``. You may set this to a temporary directory, but then you must call ``cleanup_resources()`` to delete the extracted files when done. There is no guarantee that ``cleanup_resources()`` will be able to remove all extracted files. (Note: you may not change the extraction path for a given resource manager once resources have been extracted, unless you first call ``cleanup_resources()``.) """ if self.cached_files: raise ValueError( "Can't change extraction path, files already extracted" ) self.extraction_path = path def cleanup_resources(self, force=False): """ Delete all extracted resource files and directories, returning a list of the file and directory names that could not be successfully removed. This function does not have any concurrency protection, so it should generally only be called when the extraction path is a temporary directory exclusive to a single process. This method is not automatically called; you must call it explicitly or register it as an ``atexit`` function if you wish to ensure cleanup of a temporary directory used for extractions. """ # XXX def get_default_cache(): """Determine the default cache location This returns the ``PYTHON_EGG_CACHE`` environment variable, if set. Otherwise, on Windows, it returns a "Python-Eggs" subdirectory of the "Application Data" directory. On all other systems, it's "~/.python-eggs". """ try: return os.environ['PYTHON_EGG_CACHE'] except KeyError: pass if os.name!='nt': return os.path.expanduser('~/.python-eggs') app_data = 'Application Data' # XXX this may be locale-specific! app_homes = [ (('APPDATA',), None), # best option, should be locale-safe (('USERPROFILE',), app_data), (('HOMEDRIVE','HOMEPATH'), app_data), (('HOMEPATH',), app_data), (('HOME',), None), (('WINDIR',), app_data), # 95/98/ME ] for keys, subdir in app_homes: dirname = '' for key in keys: if key in os.environ: dirname = os.path.join(dirname, os.environ[key]) else: break else: if subdir: dirname = os.path.join(dirname,subdir) return os.path.join(dirname, 'Python-Eggs') else: raise RuntimeError( "Please set the PYTHON_EGG_CACHE enviroment variable" ) def safe_name(name): """Convert an arbitrary string to a standard distribution name Any runs of non-alphanumeric/. characters are replaced with a single '-'. """ return re.sub('[^A-Za-z0-9.]+', '-', name) def safe_version(version): """Convert an arbitrary string to a standard version string Spaces become dots, and all other non-alphanumeric characters become dashes, with runs of multiple dashes condensed to a single dash. """ version = version.replace(' ','.') return re.sub('[^A-Za-z0-9.]+', '-', version) def safe_extra(extra): """Convert an arbitrary string to a standard 'extra' name Any runs of non-alphanumeric characters are replaced with a single '_', and the result is always lowercased. """ return re.sub('[^A-Za-z0-9.]+', '_', extra).lower() def to_filename(name): """Convert a project or version name to its filename-escaped form Any '-' characters are currently replaced with '_'. """ return name.replace('-','_') _marker_names = { 'os': ['name'], 'sys': ['platform'], 'platform': ['version','machine','python_implementation'], 'python_version': [], 'python_full_version': [], 'extra':[], } _marker_values = { 'os_name': lambda: os.name, 'sys_platform': lambda: sys.platform, 'python_full_version': lambda: sys.version.split()[0], 'python_version': lambda:'%s.%s' % (sys.version_info[0], sys.version_info[1]), 'platform_version': lambda: _platinfo('version'), 'platform_machine': lambda: _platinfo('machine'), 'python_implementation': lambda: _platinfo('python_implementation') or _pyimp(), } def _platinfo(attr): try: import platform except ImportError: return '' return getattr(platform, attr, lambda:'')() def _pyimp(): if sys.platform=='cli': return 'IronPython' elif sys.platform.startswith('java'): return 'Jython' elif '__pypy__' in sys.builtin_module_names: return 'PyPy' else: return 'CPython' def invalid_marker(text): """Validate text as a PEP 426 environment marker; return exception or False""" try: evaluate_marker(text) except SyntaxError: return sys.exc_info()[1] return False def evaluate_marker(text, extra=None, _ops={}): """ Evaluate a PEP 426 environment marker on CPython 2.4+. Return a boolean indicating the marker result in this environment. Raise SyntaxError if marker is invalid. This implementation uses the 'parser' module, which is not implemented on Jython and has been superseded by the 'ast' module in Python 2.6 and later. """ if not _ops: from token import NAME, STRING import token, symbol, operator def and_test(nodelist): # MUST NOT short-circuit evaluation, or invalid syntax can be skipped! return reduce(operator.and_, [interpret(nodelist[i]) for i in range(1,len(nodelist),2)]) def test(nodelist): # MUST NOT short-circuit evaluation, or invalid syntax can be skipped! return reduce(operator.or_, [interpret(nodelist[i]) for i in range(1,len(nodelist),2)]) def atom(nodelist): t = nodelist[1][0] if t == token.LPAR: if nodelist[2][0] == token.RPAR: raise SyntaxError("Empty parentheses") return interpret(nodelist[2]) raise SyntaxError("Language feature not supported in environment markers") def comparison(nodelist): if len(nodelist)>4: raise SyntaxError("Chained comparison not allowed in environment markers") comp = nodelist[2][1] cop = comp[1] if comp[0] == NAME: if len(nodelist[2]) == 3: if cop == 'not': cop = 'not in' else: cop = 'is not' try: cop = _ops[cop] except KeyError: raise SyntaxError(repr(cop)+" operator not allowed in environment markers") return cop(evaluate(nodelist[1]), evaluate(nodelist[3])) _ops.update({ symbol.test: test, symbol.and_test: and_test, symbol.atom: atom, symbol.comparison: comparison, 'not in': lambda x,y: x not in y, 'in': lambda x,y: x in y, '==': operator.eq, '!=': operator.ne, }) if hasattr(symbol,'or_test'): _ops[symbol.or_test] = test def interpret(nodelist): while len(nodelist)==2: nodelist = nodelist[1] try: op = _ops[nodelist[0]] except KeyError: raise SyntaxError("Comparison or logical expression expected") raise SyntaxError("Language feature not supported in environment markers: "+symbol.sym_name[nodelist[0]]) return op(nodelist) def evaluate(nodelist): while len(nodelist)==2: nodelist = nodelist[1] kind = nodelist[0] name = nodelist[1] #while len(name)==2: name = name[1] if kind==NAME: try: op = _marker_values[name] except KeyError: raise SyntaxError("Unknown name %r" % name) return op() if kind==STRING: s = nodelist[1] if s[:1] not in "'\"" or s.startswith('"""') or s.startswith("'''") \ or '\\' in s: raise SyntaxError( "Only plain strings allowed in environment markers") return s[1:-1] raise SyntaxError("Language feature not supported in environment markers") return interpret(parser.expr(text).totuple(1)[1]) def _markerlib_evaluate(text): """ Evaluate a PEP 426 environment marker using markerlib. Return a boolean indicating the marker result in this environment. Raise SyntaxError if marker is invalid. """ import _markerlib # markerlib implements Metadata 1.2 (PEP 345) environment markers. # Translate the variables to Metadata 2.0 (PEP 426). env = _markerlib.default_environment() for key in env.keys(): new_key = key.replace('.', '_') env[new_key] = env.pop(key) try: result = _markerlib.interpret(text, env) except NameError: e = sys.exc_info()[1] raise SyntaxError(e.args[0]) return result if 'parser' not in globals(): # fallback to less-complete _markerlib implementation if 'parser' module # is not available. evaluate_marker = _markerlib_evaluate class NullProvider: """Try to implement resources and metadata for arbitrary PEP 302 loaders""" egg_name = None egg_info = None loader = None def __init__(self, module): self.loader = getattr(module, '__loader__', None) self.module_path = os.path.dirname(getattr(module, '__file__', '')) def get_resource_filename(self, manager, resource_name): return self._fn(self.module_path, resource_name) def get_resource_stream(self, manager, resource_name): return BytesIO(self.get_resource_string(manager, resource_name)) def get_resource_string(self, manager, resource_name): return self._get(self._fn(self.module_path, resource_name)) def has_resource(self, resource_name): return self._has(self._fn(self.module_path, resource_name)) def has_metadata(self, name): return self.egg_info and self._has(self._fn(self.egg_info,name)) if sys.version_info <= (3,): def get_metadata(self, name): if not self.egg_info: return "" return self._get(self._fn(self.egg_info,name)) else: def get_metadata(self, name): if not self.egg_info: return "" return self._get(self._fn(self.egg_info,name)).decode("utf-8") def get_metadata_lines(self, name): return yield_lines(self.get_metadata(name)) def resource_isdir(self,resource_name): return self._isdir(self._fn(self.module_path, resource_name)) def metadata_isdir(self,name): return self.egg_info and self._isdir(self._fn(self.egg_info,name)) def resource_listdir(self,resource_name): return self._listdir(self._fn(self.module_path,resource_name)) def metadata_listdir(self,name): if self.egg_info: return self._listdir(self._fn(self.egg_info,name)) return [] def run_script(self,script_name,namespace): script = 'scripts/'+script_name if not self.has_metadata(script): raise ResolutionError("No script named %r" % script_name) script_text = self.get_metadata(script).replace('\r\n','\n') script_text = script_text.replace('\r','\n') script_filename = self._fn(self.egg_info,script) namespace['__file__'] = script_filename if os.path.exists(script_filename): execfile(script_filename, namespace, namespace) else: from linecache import cache cache[script_filename] = ( len(script_text), 0, script_text.split('\n'), script_filename ) script_code = compile(script_text,script_filename,'exec') exec_(script_code, namespace, namespace) def _has(self, path): raise NotImplementedError( "Can't perform this operation for unregistered loader type" ) def _isdir(self, path): raise NotImplementedError( "Can't perform this operation for unregistered loader type" ) def _listdir(self, path): raise NotImplementedError( "Can't perform this operation for unregistered loader type" ) def _fn(self, base, resource_name): if resource_name: return os.path.join(base, *resource_name.split('/')) return base def _get(self, path): if hasattr(self.loader, 'get_data'): return self.loader.get_data(path) raise NotImplementedError( "Can't perform this operation for loaders without 'get_data()'" ) register_loader_type(object, NullProvider) class EggProvider(NullProvider): """Provider based on a virtual filesystem""" def __init__(self,module): NullProvider.__init__(self,module) self._setup_prefix() def _setup_prefix(self): # we assume here that our metadata may be nested inside a "basket" # of multiple eggs; that's why we use module_path instead of .archive path = self.module_path old = None while path!=old: if path.lower().endswith('.egg'): self.egg_name = os.path.basename(path) self.egg_info = os.path.join(path, 'EGG-INFO') self.egg_root = path break old = path path, base = os.path.split(path) class DefaultProvider(EggProvider): """Provides access to package resources in the filesystem""" def _has(self, path): return os.path.exists(path) def _isdir(self,path): return os.path.isdir(path) def _listdir(self,path): return os.listdir(path) def get_resource_stream(self, manager, resource_name): return open(self._fn(self.module_path, resource_name), 'rb') def _get(self, path): stream = open(path, 'rb') try: return stream.read() finally: stream.close() register_loader_type(type(None), DefaultProvider) if importlib_bootstrap is not None: register_loader_type(importlib_bootstrap.SourceFileLoader, DefaultProvider) class EmptyProvider(NullProvider): """Provider that returns nothing for all requests""" _isdir = _has = lambda self,path: False _get = lambda self,path: '' _listdir = lambda self,path: [] module_path = None def __init__(self): pass empty_provider = EmptyProvider() def build_zipmanifest(path): """ This builds a similar dictionary to the zipimport directory caches. However instead of tuples, ZipInfo objects are stored. The translation of the tuple is as follows: * [0] - zipinfo.filename on stock pythons this needs "/" --> os.sep on pypy it is the same (one reason why distribute did work in some cases on pypy and win32). * [1] - zipinfo.compress_type * [2] - zipinfo.compress_size * [3] - zipinfo.file_size * [4] - len(utf-8 encoding of filename) if zipinfo & 0x800 len(ascii encoding of filename) otherwise * [5] - (zipinfo.date_time[0] - 1980) << 9 | zipinfo.date_time[1] << 5 | zipinfo.date_time[2] * [6] - (zipinfo.date_time[3] - 1980) << 11 | zipinfo.date_time[4] << 5 | (zipinfo.date_time[5] // 2) * [7] - zipinfo.CRC """ zipinfo = dict() zfile = zipfile.ZipFile(path) #Got ZipFile has not __exit__ on python 3.1 try: for zitem in zfile.namelist(): zpath = zitem.replace('/', os.sep) zipinfo[zpath] = zfile.getinfo(zitem) assert zipinfo[zpath] is not None finally: zfile.close() return zipinfo class ZipProvider(EggProvider): """Resource support for zips and eggs""" eagers = None def __init__(self, module): EggProvider.__init__(self,module) self.zipinfo = build_zipmanifest(self.loader.archive) self.zip_pre = self.loader.archive+os.sep def _zipinfo_name(self, fspath): # Convert a virtual filename (full path to file) into a zipfile subpath # usable with the zipimport directory cache for our target archive if fspath.startswith(self.zip_pre): return fspath[len(self.zip_pre):] raise AssertionError( "%s is not a subpath of %s" % (fspath,self.zip_pre) ) def _parts(self,zip_path): # Convert a zipfile subpath into an egg-relative path part list fspath = self.zip_pre+zip_path # pseudo-fs path if fspath.startswith(self.egg_root+os.sep): return fspath[len(self.egg_root)+1:].split(os.sep) raise AssertionError( "%s is not a subpath of %s" % (fspath,self.egg_root) ) def get_resource_filename(self, manager, resource_name): if not self.egg_name: raise NotImplementedError( "resource_filename() only supported for .egg, not .zip" ) # no need to lock for extraction, since we use temp names zip_path = self._resource_to_zip(resource_name) eagers = self._get_eager_resources() if '/'.join(self._parts(zip_path)) in eagers: for name in eagers: self._extract_resource(manager, self._eager_to_zip(name)) return self._extract_resource(manager, zip_path) @staticmethod def _get_date_and_size(zip_stat): size = zip_stat.file_size date_time = zip_stat.date_time + (0, 0, -1) # ymdhms+wday, yday, dst #1980 offset already done timestamp = time.mktime(date_time) return timestamp, size def _extract_resource(self, manager, zip_path): if zip_path in self._index(): for name in self._index()[zip_path]: last = self._extract_resource( manager, os.path.join(zip_path, name) ) return os.path.dirname(last) # return the extracted directory name timestamp, size = self._get_date_and_size(self.zipinfo[zip_path]) if not WRITE_SUPPORT: raise IOError('"os.rename" and "os.unlink" are not supported ' 'on this platform') try: real_path = manager.get_cache_path( self.egg_name, self._parts(zip_path) ) if self._is_current(real_path, zip_path): return real_path outf, tmpnam = _mkstemp(".$extract", dir=os.path.dirname(real_path)) os.write(outf, self.loader.get_data(zip_path)) os.close(outf) utime(tmpnam, (timestamp,timestamp)) manager.postprocess(tmpnam, real_path) try: rename(tmpnam, real_path) except os.error: if os.path.isfile(real_path): if self._is_current(real_path, zip_path): # the file became current since it was checked above, # so proceed. return real_path elif os.name=='nt': # Windows, del old file and retry unlink(real_path) rename(tmpnam, real_path) return real_path raise except os.error: manager.extraction_error() # report a user-friendly error return real_path def _is_current(self, file_path, zip_path): """ Return True if the file_path is current for this zip_path """ timestamp, size = self._get_date_and_size(self.zipinfo[zip_path]) if not os.path.isfile(file_path): return False stat = os.stat(file_path) if stat.st_size!=size or stat.st_mtime!=timestamp: return False # check that the contents match zip_contents = self.loader.get_data(zip_path) f = open(file_path, 'rb') file_contents = f.read() f.close() return zip_contents == file_contents def _get_eager_resources(self): if self.eagers is None: eagers = [] for name in ('native_libs.txt', 'eager_resources.txt'): if self.has_metadata(name): eagers.extend(self.get_metadata_lines(name)) self.eagers = eagers return self.eagers def _index(self): try: return self._dirindex except AttributeError: ind = {} for path in self.zipinfo: parts = path.split(os.sep) while parts: parent = os.sep.join(parts[:-1]) if parent in ind: ind[parent].append(parts[-1]) break else: ind[parent] = [parts.pop()] self._dirindex = ind return ind def _has(self, fspath): zip_path = self._zipinfo_name(fspath) return zip_path in self.zipinfo or zip_path in self._index() def _isdir(self,fspath): return self._zipinfo_name(fspath) in self._index() def _listdir(self,fspath): return list(self._index().get(self._zipinfo_name(fspath), ())) def _eager_to_zip(self,resource_name): return self._zipinfo_name(self._fn(self.egg_root,resource_name)) def _resource_to_zip(self,resource_name): return self._zipinfo_name(self._fn(self.module_path,resource_name)) register_loader_type(zipimport.zipimporter, ZipProvider) class FileMetadata(EmptyProvider): """Metadata handler for standalone PKG-INFO files Usage:: metadata = FileMetadata("/path/to/PKG-INFO") This provider rejects all data and metadata requests except for PKG-INFO, which is treated as existing, and will be the contents of the file at the provided location. """ def __init__(self,path): self.path = path def has_metadata(self,name): return name=='PKG-INFO' def get_metadata(self,name): if name=='PKG-INFO': f = open(self.path,'rU') metadata = f.read() f.close() return metadata raise KeyError("No metadata except PKG-INFO is available") def get_metadata_lines(self,name): return yield_lines(self.get_metadata(name)) class PathMetadata(DefaultProvider): """Metadata provider for egg directories Usage:: # Development eggs: egg_info = "/path/to/PackageName.egg-info" base_dir = os.path.dirname(egg_info) metadata = PathMetadata(base_dir, egg_info) dist_name = os.path.splitext(os.path.basename(egg_info))[0] dist = Distribution(basedir,project_name=dist_name,metadata=metadata) # Unpacked egg directories: egg_path = "/path/to/PackageName-ver-pyver-etc.egg" metadata = PathMetadata(egg_path, os.path.join(egg_path,'EGG-INFO')) dist = Distribution.from_filename(egg_path, metadata=metadata) """ def __init__(self, path, egg_info): self.module_path = path self.egg_info = egg_info class EggMetadata(ZipProvider): """Metadata provider for .egg files""" def __init__(self, importer): """Create a metadata provider from a zipimporter""" self.zipinfo = build_zipmanifest(importer.archive) self.zip_pre = importer.archive+os.sep self.loader = importer if importer.prefix: self.module_path = os.path.join(importer.archive, importer.prefix) else: self.module_path = importer.archive self._setup_prefix() class ImpWrapper: """PEP 302 Importer that wraps Python's "normal" import algorithm""" def __init__(self, path=None): self.path = path def find_module(self, fullname, path=None): subname = fullname.split(".")[-1] if subname != fullname and self.path is None: return None if self.path is None: path = None else: path = [self.path] try: file, filename, etc = imp.find_module(subname, path) except ImportError: return None return ImpLoader(file, filename, etc) class ImpLoader: """PEP 302 Loader that wraps Python's "normal" import algorithm""" def __init__(self, file, filename, etc): self.file = file self.filename = filename self.etc = etc def load_module(self, fullname): try: mod = imp.load_module(fullname, self.file, self.filename, self.etc) finally: if self.file: self.file.close() # Note: we don't set __loader__ because we want the module to look # normal; i.e. this is just a wrapper for standard import machinery return mod def get_importer(path_item): """Retrieve a PEP 302 "importer" for the given path item If there is no importer, this returns a wrapper around the builtin import machinery. The returned importer is only cached if it was created by a path hook. """ try: importer = sys.path_importer_cache[path_item] except KeyError: for hook in sys.path_hooks: try: importer = hook(path_item) except ImportError: pass else: break else: importer = None sys.path_importer_cache.setdefault(path_item,importer) if importer is None: try: importer = ImpWrapper(path_item) except ImportError: pass return importer try: from pkgutil import get_importer, ImpImporter except ImportError: pass # Python 2.3 or 2.4, use our own implementation else: ImpWrapper = ImpImporter # Python 2.5, use pkgutil's implementation del ImpLoader, ImpImporter _declare_state('dict', _distribution_finders = {}) def register_finder(importer_type, distribution_finder): """Register `distribution_finder` to find distributions in sys.path items `importer_type` is the type or class of a PEP 302 "Importer" (sys.path item handler), and `distribution_finder` is a callable that, passed a path item and the importer instance, yields ``Distribution`` instances found on that path item. See ``pkg_resources.find_on_path`` for an example.""" _distribution_finders[importer_type] = distribution_finder def find_distributions(path_item, only=False): """Yield distributions accessible via `path_item`""" importer = get_importer(path_item) finder = _find_adapter(_distribution_finders, importer) return finder(importer, path_item, only) def find_in_zip(importer, path_item, only=False): metadata = EggMetadata(importer) if metadata.has_metadata('PKG-INFO'): yield Distribution.from_filename(path_item, metadata=metadata) if only: return # don't yield nested distros for subitem in metadata.resource_listdir('/'): if subitem.endswith('.egg'): subpath = os.path.join(path_item, subitem) for dist in find_in_zip(zipimport.zipimporter(subpath), subpath): yield dist register_finder(zipimport.zipimporter, find_in_zip) def find_nothing(importer, path_item, only=False): return () register_finder(object,find_nothing) def find_on_path(importer, path_item, only=False): """Yield distributions accessible on a sys.path directory""" path_item = _normalize_cached(path_item) if os.path.isdir(path_item) and os.access(path_item, os.R_OK): if path_item.lower().endswith('.egg'): # unpacked egg yield Distribution.from_filename( path_item, metadata=PathMetadata( path_item, os.path.join(path_item,'EGG-INFO') ) ) else: # scan for .egg and .egg-info in directory for entry in os.listdir(path_item): lower = entry.lower() if lower.endswith('.egg-info') or lower.endswith('.dist-info'): fullpath = os.path.join(path_item, entry) if os.path.isdir(fullpath): # egg-info directory, allow getting metadata metadata = PathMetadata(path_item, fullpath) else: metadata = FileMetadata(fullpath) yield Distribution.from_location( path_item,entry,metadata,precedence=DEVELOP_DIST ) elif not only and lower.endswith('.egg'): for dist in find_distributions(os.path.join(path_item, entry)): yield dist elif not only and lower.endswith('.egg-link'): entry_file = open(os.path.join(path_item, entry)) try: entry_lines = entry_file.readlines() finally: entry_file.close() for line in entry_lines: if not line.strip(): continue for item in find_distributions(os.path.join(path_item,line.rstrip())): yield item break register_finder(ImpWrapper,find_on_path) if importlib_bootstrap is not None: register_finder(importlib_bootstrap.FileFinder, find_on_path) _declare_state('dict', _namespace_handlers={}) _declare_state('dict', _namespace_packages={}) def register_namespace_handler(importer_type, namespace_handler): """Register `namespace_handler` to declare namespace packages `importer_type` is the type or class of a PEP 302 "Importer" (sys.path item handler), and `namespace_handler` is a callable like this:: def namespace_handler(importer,path_entry,moduleName,module): # return a path_entry to use for child packages Namespace handlers are only called if the importer object has already agreed that it can handle the relevant path item, and they should only return a subpath if the module __path__ does not already contain an equivalent subpath. For an example namespace handler, see ``pkg_resources.file_ns_handler``. """ _namespace_handlers[importer_type] = namespace_handler def _handle_ns(packageName, path_item): """Ensure that named package includes a subpath of path_item (if needed)""" importer = get_importer(path_item) if importer is None: return None loader = importer.find_module(packageName) if loader is None: return None module = sys.modules.get(packageName) if module is None: module = sys.modules[packageName] = imp.new_module(packageName) module.__path__ = []; _set_parent_ns(packageName) elif not hasattr(module,'__path__'): raise TypeError("Not a package:", packageName) handler = _find_adapter(_namespace_handlers, importer) subpath = handler(importer,path_item,packageName,module) if subpath is not None: path = module.__path__; path.append(subpath) loader.load_module(packageName); module.__path__ = path return subpath def declare_namespace(packageName): """Declare that package 'packageName' is a namespace package""" imp.acquire_lock() try: if packageName in _namespace_packages: return path, parent = sys.path, None if '.' in packageName: parent = '.'.join(packageName.split('.')[:-1]) declare_namespace(parent) if parent not in _namespace_packages: __import__(parent) try: path = sys.modules[parent].__path__ except AttributeError: raise TypeError("Not a package:", parent) # Track what packages are namespaces, so when new path items are added, # they can be updated _namespace_packages.setdefault(parent,[]).append(packageName) _namespace_packages.setdefault(packageName,[]) for path_item in path: # Ensure all the parent's path items are reflected in the child, # if they apply _handle_ns(packageName, path_item) finally: imp.release_lock() def fixup_namespace_packages(path_item, parent=None): """Ensure that previously-declared namespace packages include path_item""" imp.acquire_lock() try: for package in _namespace_packages.get(parent,()): subpath = _handle_ns(package, path_item) if subpath: fixup_namespace_packages(subpath,package) finally: imp.release_lock() def file_ns_handler(importer, path_item, packageName, module): """Compute an ns-package subpath for a filesystem or zipfile importer""" subpath = os.path.join(path_item, packageName.split('.')[-1]) normalized = _normalize_cached(subpath) for item in module.__path__: if _normalize_cached(item)==normalized: break else: # Only return the path if it's not already there return subpath register_namespace_handler(ImpWrapper,file_ns_handler) register_namespace_handler(zipimport.zipimporter,file_ns_handler) if importlib_bootstrap is not None: register_namespace_handler(importlib_bootstrap.FileFinder, file_ns_handler) def null_ns_handler(importer, path_item, packageName, module): return None register_namespace_handler(object,null_ns_handler) def normalize_path(filename): """Normalize a file/dir name for comparison purposes""" return os.path.normcase(os.path.realpath(filename)) def _normalize_cached(filename,_cache={}): try: return _cache[filename] except KeyError: _cache[filename] = result = normalize_path(filename) return result def _set_parent_ns(packageName): parts = packageName.split('.') name = parts.pop() if parts: parent = '.'.join(parts) setattr(sys.modules[parent], name, sys.modules[packageName]) def yield_lines(strs): """Yield non-empty/non-comment lines of a ``basestring`` or sequence""" if isinstance(strs,basestring): for s in strs.splitlines(): s = s.strip() if s and not s.startswith('#'): # skip blank lines/comments yield s else: for ss in strs: for s in yield_lines(ss): yield s LINE_END = re.compile(r"\s*(#.*)?$").match # whitespace and comment CONTINUE = re.compile(r"\s*\\\s*(#.*)?$").match # line continuation DISTRO = re.compile(r"\s*((\w|[-.])+)").match # Distribution or extra VERSION = re.compile(r"\s*(<=?|>=?|==|!=)\s*((\w|[-.])+)").match # ver. info COMMA = re.compile(r"\s*,").match # comma between items OBRACKET = re.compile(r"\s*\[").match CBRACKET = re.compile(r"\s*\]").match MODULE = re.compile(r"\w+(\.\w+)*$").match EGG_NAME = re.compile( r"(?P<name>[^-]+)" r"( -(?P<ver>[^-]+) (-py(?P<pyver>[^-]+) (-(?P<plat>.+))? )? )?", re.VERBOSE | re.IGNORECASE ).match component_re = re.compile(r'(\d+ | [a-z]+ | \.| -)', re.VERBOSE) replace = {'pre':'c', 'preview':'c','-':'final-','rc':'c','dev':'@'}.get def _parse_version_parts(s): for part in component_re.split(s): part = replace(part,part) if not part or part=='.': continue if part[:1] in '0123456789': yield part.zfill(8) # pad for numeric comparison else: yield '*'+part yield '*final' # ensure that alpha/beta/candidate are before final def parse_version(s): """Convert a version string to a chronologically-sortable key This is a rough cross between distutils' StrictVersion and LooseVersion; if you give it versions that would work with StrictVersion, then it behaves the same; otherwise it acts like a slightly-smarter LooseVersion. It is *possible* to create pathological version coding schemes that will fool this parser, but they should be very rare in practice. The returned value will be a tuple of strings. Numeric portions of the version are padded to 8 digits so they will compare numerically, but without relying on how numbers compare relative to strings. Dots are dropped, but dashes are retained. Trailing zeros between alpha segments or dashes are suppressed, so that e.g. "2.4.0" is considered the same as "2.4". Alphanumeric parts are lower-cased. The algorithm assumes that strings like "-" and any alpha string that alphabetically follows "final" represents a "patch level". So, "2.4-1" is assumed to be a branch or patch of "2.4", and therefore "2.4.1" is considered newer than "2.4-1", which in turn is newer than "2.4". Strings like "a", "b", "c", "alpha", "beta", "candidate" and so on (that come before "final" alphabetically) are assumed to be pre-release versions, so that the version "2.4" is considered newer than "2.4a1". Finally, to handle miscellaneous cases, the strings "pre", "preview", and "rc" are treated as if they were "c", i.e. as though they were release candidates, and therefore are not as new as a version string that does not contain them, and "dev" is replaced with an '@' so that it sorts lower than than any other pre-release tag. """ parts = [] for part in _parse_version_parts(s.lower()): if part.startswith('*'): if part<'*final': # remove '-' before a prerelease tag while parts and parts[-1]=='*final-': parts.pop() # remove trailing zeros from each series of numeric parts while parts and parts[-1]=='00000000': parts.pop() parts.append(part) return tuple(parts) class EntryPoint(object): """Object representing an advertised importable object""" def __init__(self, name, module_name, attrs=(), extras=(), dist=None): if not MODULE(module_name): raise ValueError("Invalid module name", module_name) self.name = name self.module_name = module_name self.attrs = tuple(attrs) self.extras = Requirement.parse(("x[%s]" % ','.join(extras))).extras self.dist = dist def __str__(self): s = "%s = %s" % (self.name, self.module_name) if self.attrs: s += ':' + '.'.join(self.attrs) if self.extras: s += ' [%s]' % ','.join(self.extras) return s def __repr__(self): return "EntryPoint.parse(%r)" % str(self) def load(self, require=True, env=None, installer=None): if require: self.require(env, installer) entry = __import__(self.module_name, globals(),globals(), ['__name__']) for attr in self.attrs: try: entry = getattr(entry,attr) except AttributeError: raise ImportError("%r has no %r attribute" % (entry,attr)) return entry def require(self, env=None, installer=None): if self.extras and not self.dist: raise UnknownExtra("Can't require() without a distribution", self) list(map(working_set.add, working_set.resolve(self.dist.requires(self.extras),env,installer))) #@classmethod def parse(cls, src, dist=None): """Parse a single entry point from string `src` Entry point syntax follows the form:: name = some.module:some.attr [extra1,extra2] The entry name and module name are required, but the ``:attrs`` and ``[extras]`` parts are optional """ try: attrs = extras = () name,value = src.split('=',1) if '[' in value: value,extras = value.split('[',1) req = Requirement.parse("x["+extras) if req.specs: raise ValueError extras = req.extras if ':' in value: value,attrs = value.split(':',1) if not MODULE(attrs.rstrip()): raise ValueError attrs = attrs.rstrip().split('.') except ValueError: raise ValueError( "EntryPoint must be in 'name=module:attrs [extras]' format", src ) else: return cls(name.strip(), value.strip(), attrs, extras, dist) parse = classmethod(parse) #@classmethod def parse_group(cls, group, lines, dist=None): """Parse an entry point group""" if not MODULE(group): raise ValueError("Invalid group name", group) this = {} for line in yield_lines(lines): ep = cls.parse(line, dist) if ep.name in this: raise ValueError("Duplicate entry point", group, ep.name) this[ep.name]=ep return this parse_group = classmethod(parse_group) #@classmethod def parse_map(cls, data, dist=None): """Parse a map of entry point groups""" if isinstance(data,dict): data = data.items() else: data = split_sections(data) maps = {} for group, lines in data: if group is None: if not lines: continue raise ValueError("Entry points must be listed in groups") group = group.strip() if group in maps: raise ValueError("Duplicate group name", group) maps[group] = cls.parse_group(group, lines, dist) return maps parse_map = classmethod(parse_map) def _remove_md5_fragment(location): if not location: return '' parsed = urlparse(location) if parsed[-1].startswith('md5='): return urlunparse(parsed[:-1] + ('',)) return location class Distribution(object): """Wrap an actual or potential sys.path entry w/metadata""" PKG_INFO = 'PKG-INFO' def __init__(self, location=None, metadata=None, project_name=None, version=None, py_version=PY_MAJOR, platform=None, precedence = EGG_DIST ): self.project_name = safe_name(project_name or 'Unknown') if version is not None: self._version = safe_version(version) self.py_version = py_version self.platform = platform self.location = location self.precedence = precedence self._provider = metadata or empty_provider #@classmethod def from_location(cls,location,basename,metadata=None,**kw): project_name, version, py_version, platform = [None]*4 basename, ext = os.path.splitext(basename) if ext.lower() in _distributionImpl: # .dist-info gets much metadata differently match = EGG_NAME(basename) if match: project_name, version, py_version, platform = match.group( 'name','ver','pyver','plat' ) cls = _distributionImpl[ext.lower()] return cls( location, metadata, project_name=project_name, version=version, py_version=py_version, platform=platform, **kw ) from_location = classmethod(from_location) hashcmp = property( lambda self: ( getattr(self,'parsed_version',()), self.precedence, self.key, _remove_md5_fragment(self.location), self.py_version, self.platform ) ) def __hash__(self): return hash(self.hashcmp) def __lt__(self, other): return self.hashcmp < other.hashcmp def __le__(self, other): return self.hashcmp <= other.hashcmp def __gt__(self, other): return self.hashcmp > other.hashcmp def __ge__(self, other): return self.hashcmp >= other.hashcmp def __eq__(self, other): if not isinstance(other, self.__class__): # It's not a Distribution, so they are not equal return False return self.hashcmp == other.hashcmp def __ne__(self, other): return not self == other # These properties have to be lazy so that we don't have to load any # metadata until/unless it's actually needed. (i.e., some distributions # may not know their name or version without loading PKG-INFO) #@property def key(self): try: return self._key except AttributeError: self._key = key = self.project_name.lower() return key key = property(key) #@property def parsed_version(self): try: return self._parsed_version except AttributeError: self._parsed_version = pv = parse_version(self.version) return pv parsed_version = property(parsed_version) #@property def version(self): try: return self._version except AttributeError: for line in self._get_metadata(self.PKG_INFO): if line.lower().startswith('version:'): self._version = safe_version(line.split(':',1)[1].strip()) return self._version else: raise ValueError( "Missing 'Version:' header and/or %s file" % self.PKG_INFO, self ) version = property(version) #@property def _dep_map(self): try: return self.__dep_map except AttributeError: dm = self.__dep_map = {None: []} for name in 'requires.txt', 'depends.txt': for extra,reqs in split_sections(self._get_metadata(name)): if extra: if ':' in extra: extra, marker = extra.split(':',1) if invalid_marker(marker): reqs=[] # XXX warn elif not evaluate_marker(marker): reqs=[] extra = safe_extra(extra) or None dm.setdefault(extra,[]).extend(parse_requirements(reqs)) return dm _dep_map = property(_dep_map) def requires(self,extras=()): """List of Requirements needed for this distro if `extras` are used""" dm = self._dep_map deps = [] deps.extend(dm.get(None,())) for ext in extras: try: deps.extend(dm[safe_extra(ext)]) except KeyError: raise UnknownExtra( "%s has no such extra feature %r" % (self, ext) ) return deps def _get_metadata(self,name): if self.has_metadata(name): for line in self.get_metadata_lines(name): yield line def activate(self,path=None): """Ensure distribution is importable on `path` (default=sys.path)""" if path is None: path = sys.path self.insert_on(path) if path is sys.path: fixup_namespace_packages(self.location) list(map(declare_namespace, self._get_metadata('namespace_packages.txt'))) def egg_name(self): """Return what this distribution's standard .egg filename should be""" filename = "%s-%s-py%s" % ( to_filename(self.project_name), to_filename(self.version), self.py_version or PY_MAJOR ) if self.platform: filename += '-'+self.platform return filename def __repr__(self): if self.location: return "%s (%s)" % (self,self.location) else: return str(self) def __str__(self): try: version = getattr(self,'version',None) except ValueError: version = None version = version or "[unknown version]" return "%s %s" % (self.project_name,version) def __getattr__(self,attr): """Delegate all unrecognized public attributes to .metadata provider""" if attr.startswith('_'): raise AttributeError(attr) return getattr(self._provider, attr) #@classmethod def from_filename(cls,filename,metadata=None, **kw): return cls.from_location( _normalize_cached(filename), os.path.basename(filename), metadata, **kw ) from_filename = classmethod(from_filename) def as_requirement(self): """Return a ``Requirement`` that matches this distribution exactly""" return Requirement.parse('%s==%s' % (self.project_name, self.version)) def load_entry_point(self, group, name): """Return the `name` entry point of `group` or raise ImportError""" ep = self.get_entry_info(group,name) if ep is None: raise ImportError("Entry point %r not found" % ((group,name),)) return ep.load() def get_entry_map(self, group=None): """Return the entry point map for `group`, or the full entry map""" try: ep_map = self._ep_map except AttributeError: ep_map = self._ep_map = EntryPoint.parse_map( self._get_metadata('entry_points.txt'), self ) if group is not None: return ep_map.get(group,{}) return ep_map def get_entry_info(self, group, name): """Return the EntryPoint object for `group`+`name`, or ``None``""" return self.get_entry_map(group).get(name) def insert_on(self, path, loc = None): """Insert self.location in path before its nearest parent directory""" loc = loc or self.location if not loc: return nloc = _normalize_cached(loc) bdir = os.path.dirname(nloc) npath= [(p and _normalize_cached(p) or p) for p in path] bp = None for p, item in enumerate(npath): if item==nloc: break elif item==bdir and self.precedence==EGG_DIST: # if it's an .egg, give it precedence over its directory if path is sys.path: self.check_version_conflict() path.insert(p, loc) npath.insert(p, nloc) break else: if path is sys.path: self.check_version_conflict() path.append(loc) return # p is the spot where we found or inserted loc; now remove duplicates while 1: try: np = npath.index(nloc, p+1) except ValueError: break else: del npath[np], path[np] p = np # ha! return def check_version_conflict(self): if self.key=='setuptools': return # ignore the inevitable setuptools self-conflicts :( nsp = dict.fromkeys(self._get_metadata('namespace_packages.txt')) loc = normalize_path(self.location) for modname in self._get_metadata('top_level.txt'): if (modname not in sys.modules or modname in nsp or modname in _namespace_packages ): continue if modname in ('pkg_resources', 'setuptools', 'site'): continue fn = getattr(sys.modules[modname], '__file__', None) if fn and (normalize_path(fn).startswith(loc) or fn.startswith(self.location)): continue issue_warning( "Module %s was already imported from %s, but %s is being added" " to sys.path" % (modname, fn, self.location), ) def has_version(self): try: self.version except ValueError: issue_warning("Unbuilt egg for "+repr(self)) return False return True def clone(self,**kw): """Copy this distribution, substituting in any changed keyword args""" for attr in ( 'project_name', 'version', 'py_version', 'platform', 'location', 'precedence' ): kw.setdefault(attr, getattr(self,attr,None)) kw.setdefault('metadata', self._provider) return self.__class__(**kw) #@property def extras(self): return [dep for dep in self._dep_map if dep] extras = property(extras) class DistInfoDistribution(Distribution): """Wrap an actual or potential sys.path entry w/metadata, .dist-info style""" PKG_INFO = 'METADATA' EQEQ = re.compile(r"([\(,])\s*(\d.*?)\s*([,\)])") @property def _parsed_pkg_info(self): """Parse and cache metadata""" try: return self._pkg_info except AttributeError: from email.parser import Parser self._pkg_info = Parser().parsestr(self.get_metadata(self.PKG_INFO)) return self._pkg_info @property def _dep_map(self): try: return self.__dep_map except AttributeError: self.__dep_map = self._compute_dependencies() return self.__dep_map def _preparse_requirement(self, requires_dist): """Convert 'Foobar (1); baz' to ('Foobar ==1', 'baz') Split environment marker, add == prefix to version specifiers as necessary, and remove parenthesis. """ parts = requires_dist.split(';', 1) + [''] distvers = parts[0].strip() mark = parts[1].strip() distvers = re.sub(self.EQEQ, r"\1==\2\3", distvers) distvers = distvers.replace('(', '').replace(')', '') return (distvers, mark) def _compute_dependencies(self): """Recompute this distribution's dependencies.""" from _markerlib import compile as compile_marker dm = self.__dep_map = {None: []} reqs = [] # Including any condition expressions for req in self._parsed_pkg_info.get_all('Requires-Dist') or []: distvers, mark = self._preparse_requirement(req) parsed = next(parse_requirements(distvers)) parsed.marker_fn = compile_marker(mark) reqs.append(parsed) def reqs_for_extra(extra): for req in reqs: if req.marker_fn(override={'extra':extra}): yield req common = frozenset(reqs_for_extra(None)) dm[None].extend(common) for extra in self._parsed_pkg_info.get_all('Provides-Extra') or []: extra = safe_extra(extra.strip()) dm[extra] = list(frozenset(reqs_for_extra(extra)) - common) return dm _distributionImpl = {'.egg': Distribution, '.egg-info': Distribution, '.dist-info': DistInfoDistribution } def issue_warning(*args,**kw): level = 1 g = globals() try: # find the first stack frame that is *not* code in # the pkg_resources module, to use for the warning while sys._getframe(level).f_globals is g: level += 1 except ValueError: pass from warnings import warn warn(stacklevel = level+1, *args, **kw) def parse_requirements(strs): """Yield ``Requirement`` objects for each specification in `strs` `strs` must be an instance of ``basestring``, or a (possibly-nested) iterable thereof. """ # create a steppable iterator, so we can handle \-continuations lines = iter(yield_lines(strs)) def scan_list(ITEM,TERMINATOR,line,p,groups,item_name): items = [] while not TERMINATOR(line,p): if CONTINUE(line,p): try: line = next(lines); p = 0 except StopIteration: raise ValueError( "\\ must not appear on the last nonblank line" ) match = ITEM(line,p) if not match: raise ValueError("Expected "+item_name+" in",line,"at",line[p:]) items.append(match.group(*groups)) p = match.end() match = COMMA(line,p) if match: p = match.end() # skip the comma elif not TERMINATOR(line,p): raise ValueError( "Expected ',' or end-of-list in",line,"at",line[p:] ) match = TERMINATOR(line,p) if match: p = match.end() # skip the terminator, if any return line, p, items for line in lines: match = DISTRO(line) if not match: raise ValueError("Missing distribution spec", line) project_name = match.group(1) p = match.end() extras = [] match = OBRACKET(line,p) if match: p = match.end() line, p, extras = scan_list( DISTRO, CBRACKET, line, p, (1,), "'extra' name" ) line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec") specs = [(op,safe_version(val)) for op,val in specs] yield Requirement(project_name, specs, extras) def _sort_dists(dists): tmp = [(dist.hashcmp,dist) for dist in dists] tmp.sort() dists[::-1] = [d for hc,d in tmp] class Requirement: def __init__(self, project_name, specs, extras): """DO NOT CALL THIS UNDOCUMENTED METHOD; use Requirement.parse()!""" self.unsafe_name, project_name = project_name, safe_name(project_name) self.project_name, self.key = project_name, project_name.lower() index = [(parse_version(v),state_machine[op],op,v) for op,v in specs] index.sort() self.specs = [(op,ver) for parsed,trans,op,ver in index] self.index, self.extras = index, tuple(map(safe_extra,extras)) self.hashCmp = ( self.key, tuple([(op,parsed) for parsed,trans,op,ver in index]), frozenset(self.extras) ) self.__hash = hash(self.hashCmp) def __str__(self): specs = ','.join([''.join(s) for s in self.specs]) extras = ','.join(self.extras) if extras: extras = '[%s]' % extras return '%s%s%s' % (self.project_name, extras, specs) def __eq__(self,other): return isinstance(other,Requirement) and self.hashCmp==other.hashCmp def __contains__(self,item): if isinstance(item,Distribution): if item.key != self.key: return False if self.index: item = item.parsed_version # only get if we need it elif isinstance(item,basestring): item = parse_version(item) last = None compare = lambda a, b: (a > b) - (a < b) # -1, 0, 1 for parsed,trans,op,ver in self.index: action = trans[compare(item,parsed)] # Indexing: 0, 1, -1 if action=='F': return False elif action=='T': return True elif action=='+': last = True elif action=='-' or last is None: last = False if last is None: last = True # no rules encountered return last def __hash__(self): return self.__hash def __repr__(self): return "Requirement.parse(%r)" % str(self) #@staticmethod def parse(s): reqs = list(parse_requirements(s)) if reqs: if len(reqs)==1: return reqs[0] raise ValueError("Expected only one requirement", s) raise ValueError("No requirements found", s) parse = staticmethod(parse) state_machine = { # =>< '<' : '--T', '<=': 'T-T', '>' : 'F+F', '>=': 'T+F', '==': 'T..', '!=': 'F++', } def _get_mro(cls): """Get an mro for a type or classic class""" if not isinstance(cls,type): class cls(cls,object): pass return cls.__mro__[1:] return cls.__mro__ def _find_adapter(registry, ob): """Return an adapter factory for `ob` from `registry`""" for t in _get_mro(getattr(ob, '__class__', type(ob))): if t in registry: return registry[t] def ensure_directory(path): """Ensure that the parent directory of `path` exists""" dirname = os.path.dirname(path) if not os.path.isdir(dirname): os.makedirs(dirname) def split_sections(s): """Split a string or iterable thereof into (section,content) pairs Each ``section`` is a stripped version of the section header ("[section]") and each ``content`` is a list of stripped lines excluding blank lines and comment-only lines. If there are any such lines before the first section header, they're returned in a first ``section`` of ``None``. """ section = None content = [] for line in yield_lines(s): if line.startswith("["): if line.endswith("]"): if section or content: yield section, content section = line[1:-1].strip() content = [] else: raise ValueError("Invalid section heading", line) else: content.append(line) # wrap up last segment yield section, content def _mkstemp(*args,**kw): from tempfile import mkstemp old_open = os.open try: os.open = os_open # temporarily bypass sandboxing return mkstemp(*args,**kw) finally: os.open = old_open # and then put it back # Set up global resource manager (deliberately not state-saved) _manager = ResourceManager() def _initialize(g): for name in dir(_manager): if not name.startswith('_'): g[name] = getattr(_manager, name) _initialize(globals()) # Prepare the master working set and make the ``require()`` API available _declare_state('object', working_set = WorkingSet()) try: # Does the main program list any requirements? from __main__ import __requires__ except ImportError: pass # No: just use the default working set based on sys.path else: # Yes: ensure the requirements are met, by prefixing sys.path if necessary try: working_set.require(__requires__) except VersionConflict: # try it without defaults already on sys.path working_set = WorkingSet([]) # by starting with an empty path for dist in working_set.resolve( parse_requirements(__requires__), Environment() ): working_set.add(dist) for entry in sys.path: # add any missing entries from sys.path if entry not in working_set.entries: working_set.add_entry(entry) sys.path[:] = working_set.entries # then copy back to sys.path require = working_set.require iter_entry_points = working_set.iter_entry_points add_activation_listener = working_set.subscribe run_script = working_set.run_script run_main = run_script # backward compatibility # Activate all distributions already on sys.path, and ensure that # all distributions added to the working set in the future (e.g. by # calling ``require()``) will get activated as well. add_activation_listener(lambda dist: dist.activate()) working_set.entries=[]; list(map(working_set.add_entry,sys.path)) # match order