268 lines
8.8 KiB
Python
268 lines
8.8 KiB
Python
"""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():
|
|
# type: () -> 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):
|
|
# type: (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):
|
|
# type: (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, target):
|
|
# type: (str, 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):
|
|
# type: (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):
|
|
# type: (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, location, flatten=True):
|
|
# type: (str, str, bool) -> 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, location):
|
|
# type: (str, 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:
|
|
# https://github.com/python/typeshed/issues/2673
|
|
tar._extract_member(member, path) # type: ignore
|
|
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, # type: str
|
|
location, # type: str
|
|
content_type=None, # type: Optional[str]
|
|
):
|
|
# type: (...) -> 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}")
|