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Diffstat (limited to 'venv/lib/python3.11/site-packages/pip/_internal/utils/unpacking.py')
| -rw-r--r-- | venv/lib/python3.11/site-packages/pip/_internal/utils/unpacking.py | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/venv/lib/python3.11/site-packages/pip/_internal/utils/unpacking.py b/venv/lib/python3.11/site-packages/pip/_internal/utils/unpacking.py new file mode 100644 index 0000000..78b5c13 --- /dev/null +++ b/venv/lib/python3.11/site-packages/pip/_internal/utils/unpacking.py @@ -0,0 +1,257 @@ +"""Utilities related archives. +""" + +import logging +import os +import shutil +import stat +import tarfile +import zipfile +from typing import Iterable, List, Optional +from zipfile import ZipInfo + +from pip._internal.exceptions import InstallationError +from pip._internal.utils.filetypes import ( + BZ2_EXTENSIONS, + TAR_EXTENSIONS, + XZ_EXTENSIONS, + ZIP_EXTENSIONS, +) +from pip._internal.utils.misc import ensure_dir + +logger = logging.getLogger(__name__) + + +SUPPORTED_EXTENSIONS = ZIP_EXTENSIONS + TAR_EXTENSIONS + +try: + import bz2 # noqa + + SUPPORTED_EXTENSIONS += BZ2_EXTENSIONS +except ImportError: + logger.debug("bz2 module is not available") + +try: + # Only for Python 3.3+ + import lzma # noqa + + SUPPORTED_EXTENSIONS += XZ_EXTENSIONS +except ImportError: + logger.debug("lzma module is not available") + + +def current_umask() -> int: + """Get the current umask which involves having to set it temporarily.""" + mask = os.umask(0) + os.umask(mask) + return mask + + +def split_leading_dir(path: str) -> List[str]: + path = path.lstrip("/").lstrip("\\") + if "/" in path and ( + ("\\" in path and path.find("/") < path.find("\\")) or "\\" not in path + ): + return path.split("/", 1) + elif "\\" in path: + return path.split("\\", 1) + else: + return [path, ""] + + +def has_leading_dir(paths: Iterable[str]) -> bool: + """Returns true if all the paths have the same leading path name + (i.e., everything is in one subdirectory in an archive)""" + common_prefix = None + for path in paths: + prefix, rest = split_leading_dir(path) + if not prefix: + return False + elif common_prefix is None: + common_prefix = prefix + elif prefix != common_prefix: + return False + return True + + +def is_within_directory(directory: str, target: str) -> bool: + """ + Return true if the absolute path of target is within the directory + """ + abs_directory = os.path.abspath(directory) + abs_target = os.path.abspath(target) + + prefix = os.path.commonprefix([abs_directory, abs_target]) + return prefix == abs_directory + + +def set_extracted_file_to_default_mode_plus_executable(path: str) -> None: + """ + Make file present at path have execute for user/group/world + (chmod +x) is no-op on windows per python docs + """ + os.chmod(path, (0o777 & ~current_umask() | 0o111)) + + +def zip_item_is_executable(info: ZipInfo) -> bool: + mode = info.external_attr >> 16 + # if mode and regular file and any execute permissions for + # user/group/world? + return bool(mode and stat.S_ISREG(mode) and mode & 0o111) + + +def unzip_file(filename: str, location: str, flatten: bool = True) -> None: + """ + Unzip the file (with path `filename`) to the destination `location`. All + files are written based on system defaults and umask (i.e. permissions are + not preserved), except that regular file members with any execute + permissions (user, group, or world) have "chmod +x" applied after being + written. Note that for windows, any execute changes using os.chmod are + no-ops per the python docs. + """ + ensure_dir(location) + zipfp = open(filename, "rb") + try: + zip = zipfile.ZipFile(zipfp, allowZip64=True) + leading = has_leading_dir(zip.namelist()) and flatten + for info in zip.infolist(): + name = info.filename + fn = name + if leading: + fn = split_leading_dir(name)[1] + fn = os.path.join(location, fn) + dir = os.path.dirname(fn) + if not is_within_directory(location, fn): + message = ( + "The zip file ({}) has a file ({}) trying to install " + "outside target directory ({})" + ) + raise InstallationError(message.format(filename, fn, location)) + if fn.endswith("/") or fn.endswith("\\"): + # A directory + ensure_dir(fn) + else: + ensure_dir(dir) + # Don't use read() to avoid allocating an arbitrarily large + # chunk of memory for the file's content + fp = zip.open(name) + try: + with open(fn, "wb") as destfp: + shutil.copyfileobj(fp, destfp) + finally: + fp.close() + if zip_item_is_executable(info): + set_extracted_file_to_default_mode_plus_executable(fn) + finally: + zipfp.close() + + +def untar_file(filename: str, location: str) -> None: + """ + Untar the file (with path `filename`) to the destination `location`. + All files are written based on system defaults and umask (i.e. permissions + are not preserved), except that regular file members with any execute + permissions (user, group, or world) have "chmod +x" applied after being + written. Note that for windows, any execute changes using os.chmod are + no-ops per the python docs. + """ + ensure_dir(location) + if filename.lower().endswith(".gz") or filename.lower().endswith(".tgz"): + mode = "r:gz" + elif filename.lower().endswith(BZ2_EXTENSIONS): + mode = "r:bz2" + elif filename.lower().endswith(XZ_EXTENSIONS): + mode = "r:xz" + elif filename.lower().endswith(".tar"): + mode = "r" + else: + logger.warning( + "Cannot determine compression type for file %s", + filename, + ) + mode = "r:*" + tar = tarfile.open(filename, mode, encoding="utf-8") + try: + leading = has_leading_dir([member.name for member in tar.getmembers()]) + for member in tar.getmembers(): + fn = member.name + if leading: + fn = split_leading_dir(fn)[1] + path = os.path.join(location, fn) + if not is_within_directory(location, path): + message = ( + "The tar file ({}) has a file ({}) trying to install " + "outside target directory ({})" + ) + raise InstallationError(message.format(filename, path, location)) + if member.isdir(): + ensure_dir(path) + elif member.issym(): + try: + tar._extract_member(member, path) + except Exception as exc: + # Some corrupt tar files seem to produce this + # (specifically bad symlinks) + logger.warning( + "In the tar file %s the member %s is invalid: %s", + filename, + member.name, + exc, + ) + continue + else: + try: + fp = tar.extractfile(member) + except (KeyError, AttributeError) as exc: + # Some corrupt tar files seem to produce this + # (specifically bad symlinks) + logger.warning( + "In the tar file %s the member %s is invalid: %s", + filename, + member.name, + exc, + ) + continue + ensure_dir(os.path.dirname(path)) + assert fp is not None + with open(path, "wb") as destfp: + shutil.copyfileobj(fp, destfp) + fp.close() + # Update the timestamp (useful for cython compiled files) + tar.utime(member, path) + # member have any execute permissions for user/group/world? + if member.mode & 0o111: + set_extracted_file_to_default_mode_plus_executable(path) + finally: + tar.close() + + +def unpack_file( + filename: str, + location: str, + content_type: Optional[str] = None, +) -> None: + filename = os.path.realpath(filename) + if ( + content_type == "application/zip" + or filename.lower().endswith(ZIP_EXTENSIONS) + or zipfile.is_zipfile(filename) + ): + unzip_file(filename, location, flatten=not filename.endswith(".whl")) + elif ( + content_type == "application/x-gzip" + or tarfile.is_tarfile(filename) + or filename.lower().endswith(TAR_EXTENSIONS + BZ2_EXTENSIONS + XZ_EXTENSIONS) + ): + untar_file(filename, location) + else: + # FIXME: handle? + # FIXME: magic signatures? + logger.critical( + "Cannot unpack file %s (downloaded from %s, content-type: %s); " + "cannot detect archive format", + filename, + location, + content_type, + ) + raise InstallationError(f"Cannot determine archive format of {location}") |