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"""Implements an importer that looks only in specific path (ignoring sys.path), and uses a per-path cache in addition to sys.modules. This is necessary because test modules in different directories frequently have the same names, which means that the first loaded would mask the rest when using the builtin importer. """ import logging import os import sys from nose.config import Config from imp import find_module, load_module, acquire_lock, release_lock log = logging.getLogger(__name__) try: _samefile = os.path.samefile except AttributeError: def _samefile(src, dst): return (os.path.normcase(os.path.realpath(src)) == os.path.normcase(os.path.realpath(dst))) class Importer(object): """An importer class that does only path-specific imports. That is, the given module is not searched for on sys.path, but only at the path or in the directory specified. """ def __init__(self, config=None): if config is None: config = Config() self.config = config def importFromPath(self, path, fqname): """Import a dotted-name package whose tail is at path. In other words, given foo.bar and path/to/foo/bar.py, import foo from path/to/foo then bar from path/to/foo/bar, returning bar. """ # find the base dir of the package path_parts = os.path.normpath(os.path.abspath(path)).split(os.sep) name_parts = fqname.split('.') if path_parts[-1] == '__init__.py': path_parts.pop() path_parts = path_parts[:-(len(name_parts))] dir_path = os.sep.join(path_parts) # then import fqname starting from that dir return self.importFromDir(dir_path, fqname) def importFromDir(self, dir, fqname): """Import a module *only* from path, ignoring sys.path and reloading if the version in sys.modules is not the one we want. """ dir = os.path.normpath(os.path.abspath(dir)) log.debug("Import %s from %s", fqname, dir) # FIXME reimplement local per-dir cache? # special case for __main__ if fqname == '__main__': return sys.modules[fqname] if self.config.addPaths: add_path(dir, self.config) path = [dir] parts = fqname.split('.') part_fqname = '' mod = parent = fh = None for part in parts: if part_fqname == '': part_fqname = part else: part_fqname = "%s.%s" % (part_fqname, part) try: acquire_lock() log.debug("find module part %s (%s) in %s", part, part_fqname, path) fh, filename, desc = find_module(part, path) old = sys.modules.get(part_fqname) if old is not None: # test modules frequently have name overlap; make sure # we get a fresh copy of anything we are trying to load # from a new path log.debug("sys.modules has %s as %s", part_fqname, old) if (self.sameModule(old, filename) or (self.config.firstPackageWins and getattr(old, '__path__', None))): mod = old else: del sys.modules[part_fqname] mod = load_module(part_fqname, fh, filename, desc) else: mod = load_module(part_fqname, fh, filename, desc) finally: if fh: fh.close() release_lock() if parent: setattr(parent, part, mod) if hasattr(mod, '__path__'): path = mod.__path__ parent = mod return mod def _dirname_if_file(self, filename): # We only take the dirname if we have a path to a non-dir, # because taking the dirname of a symlink to a directory does not # give the actual directory parent. if os.path.isdir(filename): return filename else: return os.path.dirname(filename) def sameModule(self, mod, filename): mod_paths = [] if hasattr(mod, '__path__'): for path in mod.__path__: mod_paths.append(self._dirname_if_file(path)) elif hasattr(mod, '__file__'): mod_paths.append(self._dirname_if_file(mod.__file__)) else: # builtin or other module-like object that # doesn't have __file__; must be new return False new_path = self._dirname_if_file(filename) for mod_path in mod_paths: log.debug( "module already loaded? mod: %s new: %s", mod_path, new_path) if _samefile(mod_path, new_path): return True return False def add_path(path, config=None): """Ensure that the path, or the root of the current package (if path is in a package), is in sys.path. """ # FIXME add any src-looking dirs seen too... need to get config for that log.debug('Add path %s' % path) if not path: return [] added = [] parent = os.path.dirname(path) if (parent and os.path.exists(os.path.join(path, '__init__.py'))): added.extend(add_path(parent, config)) elif not path in sys.path: log.debug("insert %s into sys.path", path) sys.path.insert(0, path) added.append(path) if config and config.srcDirs: for dirname in config.srcDirs: dirpath = os.path.join(path, dirname) if os.path.isdir(dirpath): sys.path.insert(0, dirpath) added.append(dirpath) return added def remove_path(path): log.debug('Remove path %s' % path) if path in sys.path: sys.path.remove(path)