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pyi_rth_pkgres.py
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pyi_rth_pkgres.py
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#-----------------------------------------------------------------------------
# Copyright (c) 2013-2021, PyInstaller Development Team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#
# SPDX-License-Identifier: Apache-2.0
#-----------------------------------------------------------------------------
import os
import sys
import pathlib
import pkg_resources
from pyimod03_importers import FrozenImporter
SYS_PREFIX = pathlib.PurePath(sys._MEIPASS)
# To make pkg_resources work with frozen modules we need to set the 'Provider'
# class for FrozenImporter. This class decides where to look for resources
# and other stuff. 'pkg_resources.NullProvider' is dedicated to PEP302
# import hooks like FrozenImporter is. It uses method __loader__.get_data() in
# methods pkg_resources.resource_string() and pkg_resources.resource_stream()
#
# We provide PyiFrozenProvider, which subclasses the NullProvider and
# implements _has(), _isdir(), and _listdir() methods, which are needed
# for pkg_resources.resource_exists(), resource_isdir(), and resource_listdir()
# to work. We cannot use the DefaultProvider, because it provides
# filesystem-only implementations (and overrides _get() with a filesystem-only
# one), whereas our provider needs to also support embedded resources.
#
# The PyiFrozenProvider allows querying/listing both PYZ-embedded and
# on-filesystem resources in a frozen package. The results are typically
# combined for both types of resources (e.g., when listing a directory
# or checking whether a resource exists). When the order of precedence
# matters, the PYZ-embedded resources take precedence over the on-filesystem
# ones, to keep the behavior consistent with the actual file content
# retrieval via _get() method (which in turn uses FrozenImporter's get_data()
# method). For example, when checking whether a resource is a directory
# via _isdir(), a PYZ-embedded file will take precedence over a potential
# on-filesystem directory. Also, in contrast to unfrozen packages, the frozen
# ones do not contain source .py files, which are therefore absent from
# content listings.
class _TocFilesystem:
"""A prefix tree implementation for embedded filesystem reconstruction."""
def __init__(self, toc_files, toc_dirs=[]):
# Reconstruct the fileystem hierarchy by building a prefix tree from
# the given file and directory paths
self._tree = dict()
# Data files
for path in toc_files:
path = pathlib.PurePath(path)
current = self._tree
for component in path.parts[:-1]:
current = current.setdefault(component, {})
current[path.parts[-1]] = ''
# Extra directories
for path in toc_dirs:
path = pathlib.PurePath(path)
current = self._tree
for component in path.parts:
current = current.setdefault(component, {})
def _get_tree_node(self, path):
path = pathlib.PurePath(path)
current = self._tree
for component in path.parts:
if component not in current:
return None
current = current[component]
return current
def path_exists(self, path):
node = self._get_tree_node(path)
return node is not None # File or directory
def path_isdir(self, path):
node = self._get_tree_node(path)
if node is None:
return False # Non-existant
if isinstance(node, str):
return False # File
return True
def path_listdir(self, path):
node = self._get_tree_node(path)
if not isinstance(node, dict):
return [] # Non-existant or file
return list(node.keys())
# Cache for reconstructed embedded trees
_toc_tree_cache = {}
class PyiFrozenProvider(pkg_resources.NullProvider):
"""Custom pkg_resourvces provider for FrozenImporter."""
def __init__(self, module):
super().__init__(module)
# Get top-level path; if "module" corresponds to a package,
# we need the path to the package itself. If "module" is a
# submodule in a package, we need the path to the parent
# package.
self._pkg_path = pathlib.PurePath(module.__file__).parent
# Defer initialization of PYZ-embedded resources tree to the
# first access
self._embedded_tree = None
def _init_embedded_tree(self, rel_pkg_path, pkg_name):
# Collect relevant entries from TOC. We are interested in either
# files that are located in the package/module's directory (data
# files) or in packages that are prefixed with package/module's
# name (to reconstruct subpackage directories)
data_files = []
package_dirs = []
for entry in self.loader.toc:
entry_path = pathlib.PurePath(entry)
if rel_pkg_path in entry_path.parents:
# Data file path
data_files.append(entry_path)
elif entry.startswith(pkg_name) and self.loader.is_package(entry):
# Package or subpackage; convert the name to directory path
package_dir = pathlib.PurePath(*entry.split('.'))
package_dirs.append(package_dir)
# Reconstruct the filesystem
return _TocFilesystem(data_files, package_dirs)
@property
def embedded_tree(self):
if self._embedded_tree is None:
# Construct a path relative to _MEIPASS directory for
# searching the TOC
rel_pkg_path = self._pkg_path.relative_to(SYS_PREFIX)
# Reconstruct package name prefix (use package path to
# obtain correct prefix in case of a module)
pkg_name = '.'.join(rel_pkg_path.parts)
# Initialize and cache the tree, if necessary
if pkg_name not in _toc_tree_cache:
_toc_tree_cache[pkg_name] = \
self._init_embedded_tree(rel_pkg_path, pkg_name)
self._embedded_tree = _toc_tree_cache[pkg_name]
return self._embedded_tree
def _normalize_path(self, path):
# Avoid using Path.resolve(), because it resolves symlinks. This
# is undesirable, because the pure path in self._pkg_path does
# not have symlinks resolved, so comparison between the two
# would be faulty. So use os.path.abspath() instead to normalize
# the path
return pathlib.Path(os.path.abspath(path))
def _is_relative_to_package(self, path):
return path == self._pkg_path or self._pkg_path in path.parents
def _has(self, path):
# Prevent access outside the package
path = self._normalize_path(path)
if not self._is_relative_to_package(path):
return False
# Check the filesystem first to avoid unnecessarily computing
# the relative path...
if path.exists():
return True
rel_path = path.relative_to(SYS_PREFIX)
return self.embedded_tree.path_exists(rel_path)
def _isdir(self, path):
# Prevent access outside the package
path = self._normalize_path(path)
if not self._is_relative_to_package(path):
return False
# Embedded resources have precedence over filesystem...
rel_path = path.relative_to(SYS_PREFIX)
node = self.embedded_tree._get_tree_node(rel_path)
if node is None:
return path.is_dir() # No match found; try the filesystem
else:
# str = file, dict = directory
return not isinstance(node, str)
def _listdir(self, path):
# Prevent access outside the package
path = self._normalize_path(path)
if not self._is_relative_to_package(path):
return []
# Relative path for searching embedded resources
rel_path = path.relative_to(SYS_PREFIX)
# List content from embedded filesystem...
content = self.embedded_tree.path_listdir(rel_path)
# ... as well as the actual one
if path.is_dir():
# Use os.listdir() to avoid having to convert Path objects
# to strings... Also make sure to de-duplicate the results
path = str(path) # not is_py36
content = list(set(content + os.listdir(path)))
return content
pkg_resources.register_loader_type(FrozenImporter, PyiFrozenProvider)