294 lines
9.3 KiB
Python
294 lines
9.3 KiB
Python
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"""Stuff that differs in different Python versions and platform
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distributions."""
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# The following comment should be removed at some point in the future.
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# mypy: disallow-untyped-defs=False
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from __future__ import absolute_import, division
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import codecs
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import functools
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import locale
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import logging
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import os
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import shutil
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import sys
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from pip._vendor.six import PY2, text_type
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from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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if MYPY_CHECK_RUNNING:
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from typing import Callable, Optional, Protocol, Text, Tuple, TypeVar, Union
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# Used in the @lru_cache polyfill.
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F = TypeVar('F')
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class LruCache(Protocol):
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def __call__(self, maxsize=None):
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# type: (Optional[int]) -> Callable[[F], F]
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raise NotImplementedError
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try:
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import ipaddress
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except ImportError:
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try:
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from pip._vendor import ipaddress # type: ignore
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except ImportError:
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import ipaddr as ipaddress # type: ignore
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ipaddress.ip_address = ipaddress.IPAddress # type: ignore
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ipaddress.ip_network = ipaddress.IPNetwork # type: ignore
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__all__ = [
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"ipaddress", "uses_pycache", "console_to_str",
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"get_path_uid", "stdlib_pkgs", "WINDOWS", "samefile", "get_terminal_size",
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]
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logger = logging.getLogger(__name__)
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if PY2:
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import imp
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try:
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cache_from_source = imp.cache_from_source # type: ignore
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except AttributeError:
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# does not use __pycache__
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cache_from_source = None
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uses_pycache = cache_from_source is not None
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else:
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uses_pycache = True
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from importlib.util import cache_from_source
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if PY2:
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# In Python 2.7, backslashreplace exists
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# but does not support use for decoding.
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# We implement our own replace handler for this
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# situation, so that we can consistently use
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# backslash replacement for all versions.
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def backslashreplace_decode_fn(err):
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raw_bytes = (err.object[i] for i in range(err.start, err.end))
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# Python 2 gave us characters - convert to numeric bytes
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raw_bytes = (ord(b) for b in raw_bytes)
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return u"".join(map(u"\\x{:x}".format, raw_bytes)), err.end
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codecs.register_error(
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"backslashreplace_decode",
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backslashreplace_decode_fn,
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)
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backslashreplace_decode = "backslashreplace_decode"
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else:
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backslashreplace_decode = "backslashreplace"
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def has_tls():
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# type: () -> bool
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try:
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import _ssl # noqa: F401 # ignore unused
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return True
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except ImportError:
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pass
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from pip._vendor.urllib3.util import IS_PYOPENSSL
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return IS_PYOPENSSL
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def str_to_display(data, desc=None):
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# type: (Union[bytes, Text], Optional[str]) -> Text
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"""
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For display or logging purposes, convert a bytes object (or text) to
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text (e.g. unicode in Python 2) safe for output.
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:param desc: An optional phrase describing the input data, for use in
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the log message if a warning is logged. Defaults to "Bytes object".
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This function should never error out and so can take a best effort
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approach. It is okay to be lossy if needed since the return value is
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just for display.
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We assume the data is in the locale preferred encoding. If it won't
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decode properly, we warn the user but decode as best we can.
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We also ensure that the output can be safely written to standard output
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without encoding errors.
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"""
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if isinstance(data, text_type):
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return data
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# Otherwise, data is a bytes object (str in Python 2).
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# First, get the encoding we assume. This is the preferred
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# encoding for the locale, unless that is not found, or
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# it is ASCII, in which case assume UTF-8
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encoding = locale.getpreferredencoding()
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if (not encoding) or codecs.lookup(encoding).name == "ascii":
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encoding = "utf-8"
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# Now try to decode the data - if we fail, warn the user and
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# decode with replacement.
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try:
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decoded_data = data.decode(encoding)
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except UnicodeDecodeError:
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logger.warning(
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'%s does not appear to be encoded as %s',
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desc or 'Bytes object',
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encoding,
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)
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decoded_data = data.decode(encoding, errors=backslashreplace_decode)
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# Make sure we can print the output, by encoding it to the output
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# encoding with replacement of unencodable characters, and then
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# decoding again.
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# We use stderr's encoding because it's less likely to be
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# redirected and if we don't find an encoding we skip this
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# step (on the assumption that output is wrapped by something
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# that won't fail).
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# The double getattr is to deal with the possibility that we're
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# being called in a situation where sys.__stderr__ doesn't exist,
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# or doesn't have an encoding attribute. Neither of these cases
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# should occur in normal pip use, but there's no harm in checking
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# in case people use pip in (unsupported) unusual situations.
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output_encoding = getattr(getattr(sys, "__stderr__", None),
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"encoding", None)
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if output_encoding:
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output_encoded = decoded_data.encode(
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output_encoding,
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errors="backslashreplace"
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)
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decoded_data = output_encoded.decode(output_encoding)
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return decoded_data
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def console_to_str(data):
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# type: (bytes) -> Text
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"""Return a string, safe for output, of subprocess output.
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"""
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return str_to_display(data, desc='Subprocess output')
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def get_path_uid(path):
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# type: (str) -> int
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"""
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Return path's uid.
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Does not follow symlinks:
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https://github.com/pypa/pip/pull/935#discussion_r5307003
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Placed this function in compat due to differences on AIX and
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Jython, that should eventually go away.
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:raises OSError: When path is a symlink or can't be read.
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"""
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if hasattr(os, 'O_NOFOLLOW'):
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fd = os.open(path, os.O_RDONLY | os.O_NOFOLLOW)
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file_uid = os.fstat(fd).st_uid
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os.close(fd)
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else: # AIX and Jython
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# WARNING: time of check vulnerability, but best we can do w/o NOFOLLOW
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if not os.path.islink(path):
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# older versions of Jython don't have `os.fstat`
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file_uid = os.stat(path).st_uid
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else:
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# raise OSError for parity with os.O_NOFOLLOW above
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raise OSError(
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"{} is a symlink; Will not return uid for symlinks".format(
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path)
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)
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return file_uid
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def expanduser(path):
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# type: (str) -> str
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"""
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Expand ~ and ~user constructions.
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Includes a workaround for https://bugs.python.org/issue14768
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"""
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expanded = os.path.expanduser(path)
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if path.startswith('~/') and expanded.startswith('//'):
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expanded = expanded[1:]
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return expanded
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# packages in the stdlib that may have installation metadata, but should not be
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# considered 'installed'. this theoretically could be determined based on
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# dist.location (py27:`sysconfig.get_paths()['stdlib']`,
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# py26:sysconfig.get_config_vars('LIBDEST')), but fear platform variation may
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# make this ineffective, so hard-coding
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stdlib_pkgs = {"python", "wsgiref", "argparse"}
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# windows detection, covers cpython and ironpython
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WINDOWS = (sys.platform.startswith("win") or
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(sys.platform == 'cli' and os.name == 'nt'))
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def samefile(file1, file2):
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# type: (str, str) -> bool
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"""Provide an alternative for os.path.samefile on Windows/Python2"""
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if hasattr(os.path, 'samefile'):
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return os.path.samefile(file1, file2)
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else:
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path1 = os.path.normcase(os.path.abspath(file1))
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path2 = os.path.normcase(os.path.abspath(file2))
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return path1 == path2
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if hasattr(shutil, 'get_terminal_size'):
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def get_terminal_size():
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# type: () -> Tuple[int, int]
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"""
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Returns a tuple (x, y) representing the width(x) and the height(y)
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in characters of the terminal window.
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"""
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return tuple(shutil.get_terminal_size()) # type: ignore
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else:
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def get_terminal_size():
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# type: () -> Tuple[int, int]
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"""
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Returns a tuple (x, y) representing the width(x) and the height(y)
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in characters of the terminal window.
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"""
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def ioctl_GWINSZ(fd):
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try:
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import fcntl
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import struct
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import termios
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cr = struct.unpack_from(
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'hh',
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fcntl.ioctl(fd, termios.TIOCGWINSZ, '12345678')
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)
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except Exception:
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return None
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if cr == (0, 0):
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return None
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return cr
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cr = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2)
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if not cr:
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if sys.platform != "win32":
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try:
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fd = os.open(os.ctermid(), os.O_RDONLY)
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cr = ioctl_GWINSZ(fd)
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os.close(fd)
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except Exception:
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pass
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if not cr:
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cr = (os.environ.get('LINES', 25), os.environ.get('COLUMNS', 80))
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return int(cr[1]), int(cr[0])
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# Fallback to noop_lru_cache in Python 2
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# TODO: this can be removed when python 2 support is dropped!
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def noop_lru_cache(maxsize=None):
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# type: (Optional[int]) -> Callable[[F], F]
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def _wrapper(f):
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# type: (F) -> F
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return f
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return _wrapper
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lru_cache = getattr(functools, "lru_cache", noop_lru_cache) # type: LruCache
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