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# The following comment should be removed at some point in the future.
# mypy: strict-optional=False
import contextlib
import errno
import getpass
import hashlib
import io
import logging
import os
import posixpath
import shutil
import stat
import sys
import urllib.parse
from io import StringIO
from itertools import filterfalse, tee, zip_longest
from types import TracebackType
from typing import (
Any,
BinaryIO,
Callable,
ContextManager,
Iterable,
Iterator,
List,
Optional,
TextIO,
Tuple,
Type,
TypeVar,
cast,
)
from pip._vendor.pkg_resources import Distribution
from pip._vendor.tenacity import retry, stop_after_delay, wait_fixed
from pip import __version__
from pip._internal.exceptions import CommandError
from pip._internal.locations import get_major_minor_version, site_packages, user_site
from pip._internal.locations import get_scheme
from pip._internal.utils.compat import WINDOWS
from pip._internal.utils.egg_link import egg_link_path_from_location
from pip._internal.utils.virtualenv import running_under_virtualenv
__all__ = [
"rmtree",
"display_path",
"backup_dir",
"ask",
"splitext",
"format_size",
"is_installable_dir",
"normalize_path",
"renames",
"get_prog",
"captured_stdout",
"ensure_dir",
"remove_auth_from_url",
]
logger = logging.getLogger(__name__)
T = TypeVar("T")
ExcInfo = Tuple[Type[BaseException], BaseException, TracebackType]
VersionInfo = Tuple[int, int, int]
NetlocTuple = Tuple[str, Tuple[Optional[str], Optional[str]]]
def get_pip_version() -> str:
pip_pkg_dir = os.path.join(os.path.dirname(__file__), "..", "..")
pip_pkg_dir = os.path.abspath(pip_pkg_dir)
return "pip {} from {} (python {})".format(
__version__,
pip_pkg_dir,
get_major_minor_version(),
)
def normalize_version_info(py_version_info: Tuple[int, ...]) -> Tuple[int, int, int]:
"""
Convert a tuple of ints representing a Python version to one of length
three.
:param py_version_info: a tuple of ints representing a Python version,
or None to specify no version. The tuple can have any length.
:return: a tuple of length three if `py_version_info` is non-None.
Otherwise, return `py_version_info` unchanged (i.e. None).
"""
if len(py_version_info) < 3:
py_version_info += (3 - len(py_version_info)) * (0,)
elif len(py_version_info) > 3:
py_version_info = py_version_info[:3]
return cast("VersionInfo", py_version_info)
def ensure_dir(path: str) -> None:
"""os.path.makedirs without EEXIST."""
try:
os.makedirs(path)
except OSError as e:
# Windows can raise spurious ENOTEMPTY errors. See #6426.
if e.errno != errno.EEXIST and e.errno != errno.ENOTEMPTY:
raise
def get_prog() -> str:
try:
prog = os.path.basename(sys.argv[0])
if prog in ("__main__.py", "-c"):
return f"{sys.executable} -m pip"
else:
return prog
except (AttributeError, TypeError, IndexError):
pass
return "pip"
# Retry every half second for up to 3 seconds
# Tenacity raises RetryError by default, explicitly raise the original exception
@retry(reraise=True, stop=stop_after_delay(3), wait=wait_fixed(0.5))
def rmtree(dir: str, ignore_errors: bool = False) -> None:
shutil.rmtree(dir, ignore_errors=ignore_errors, onerror=rmtree_errorhandler)
def rmtree_errorhandler(func: Callable[..., Any], path: str, exc_info: ExcInfo) -> None:
"""On Windows, the files in .svn are read-only, so when rmtree() tries to
remove them, an exception is thrown. We catch that here, remove the
read-only attribute, and hopefully continue without problems."""
try:
has_attr_readonly = not (os.stat(path).st_mode & stat.S_IWRITE)
except OSError:
# it's equivalent to os.path.exists
return
if has_attr_readonly:
# convert to read/write
os.chmod(path, stat.S_IWRITE)
# use the original function to repeat the operation
func(path)
return
else:
raise
def display_path(path: str) -> str:
"""Gives the display value for a given path, making it relative to cwd
if possible."""
path = os.path.normcase(os.path.abspath(path))
if path.startswith(os.getcwd() + os.path.sep):
path = "." + path[len(os.getcwd()) :]
return path
def backup_dir(dir: str, ext: str = ".bak") -> str:
"""Figure out the name of a directory to back up the given dir to
(adding .bak, .bak2, etc)"""
n = 1
extension = ext
while os.path.exists(dir + extension):
n += 1
extension = ext + str(n)
return dir + extension
def ask_path_exists(message: str, options: Iterable[str]) -> str:
for action in os.environ.get("PIP_EXISTS_ACTION", "").split():
if action in options:
return action
return ask(message, options)
def _check_no_input(message: str) -> None:
"""Raise an error if no input is allowed."""
if os.environ.get("PIP_NO_INPUT"):
raise Exception(
f"No input was expected ($PIP_NO_INPUT set); question: {message}"
)
def ask(message: str, options: Iterable[str]) -> str:
"""Ask the message interactively, with the given possible responses"""
while 1:
_check_no_input(message)
response = input(message)
response = response.strip().lower()
if response not in options:
print(
"Your response ({!r}) was not one of the expected responses: "
"{}".format(response, ", ".join(options))
)
else:
return response
def ask_input(message: str) -> str:
"""Ask for input interactively."""
_check_no_input(message)
return input(message)
def ask_password(message: str) -> str:
"""Ask for a password interactively."""
_check_no_input(message)
return getpass.getpass(message)
def strtobool(val: str) -> int:
"""Convert a string representation of truth to true (1) or false (0).
True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
are 'n', 'no', 'f', 'false', 'off', and '0'. Raises ValueError if
'val' is anything else.
"""
val = val.lower()
if val in ("y", "yes", "t", "true", "on", "1"):
return 1
elif val in ("n", "no", "f", "false", "off", "0"):
return 0
else:
raise ValueError(f"invalid truth value {val!r}")
def format_size(bytes: float) -> str:
if bytes > 1000 * 1000:
return "{:.1f} MB".format(bytes / 1000.0 / 1000)
elif bytes > 10 * 1000:
return "{} kB".format(int(bytes / 1000))
elif bytes > 1000:
return "{:.1f} kB".format(bytes / 1000.0)
else:
return "{} bytes".format(int(bytes))
def tabulate(rows: Iterable[Iterable[Any]]) -> Tuple[List[str], List[int]]:
"""Return a list of formatted rows and a list of column sizes.
For example::
>>> tabulate([['foobar', 2000], [0xdeadbeef]])
(['foobar 2000', '3735928559'], [10, 4])
"""
rows = [tuple(map(str, row)) for row in rows]
sizes = [max(map(len, col)) for col in zip_longest(*rows, fillvalue="")]
table = [" ".join(map(str.ljust, row, sizes)).rstrip() for row in rows]
return table, sizes
def is_installable_dir(path: str) -> bool:
"""Is path is a directory containing pyproject.toml or setup.py?
If pyproject.toml exists, this is a PEP 517 project. Otherwise we look for
a legacy setuptools layout by identifying setup.py. We don't check for the
setup.cfg because using it without setup.py is only available for PEP 517
projects, which are already covered by the pyproject.toml check.
"""
if not os.path.isdir(path):
return False
if os.path.isfile(os.path.join(path, "pyproject.toml")):
return True
if os.path.isfile(os.path.join(path, "setup.py")):
return True
return False
def read_chunks(file: BinaryIO, size: int = io.DEFAULT_BUFFER_SIZE) -> Iterator[bytes]:
"""Yield pieces of data from a file-like object until EOF."""
while True:
chunk = file.read(size)
if not chunk:
break
yield chunk
def normalize_path(path: str, resolve_symlinks: bool = True) -> str:
"""
Convert a path to its canonical, case-normalized, absolute version.
"""
path = os.path.expanduser(path)
if resolve_symlinks:
path = os.path.realpath(path)
else:
path = os.path.abspath(path)
return os.path.normcase(path)
def splitext(path: str) -> Tuple[str, str]:
"""Like os.path.splitext, but take off .tar too"""
base, ext = posixpath.splitext(path)
if base.lower().endswith(".tar"):
ext = base[-4:] + ext
base = base[:-4]
return base, ext
def renames(old: str, new: str) -> None:
"""Like os.renames(), but handles renaming across devices."""
# Implementation borrowed from os.renames().
head, tail = os.path.split(new)
if head and tail and not os.path.exists(head):
os.makedirs(head)
shutil.move(old, new)
head, tail = os.path.split(old)
if head and tail:
try:
os.removedirs(head)
except OSError:
pass
def is_local(path: str) -> bool:
"""
Return True if path is within sys.prefix, if we're running in a virtualenv.
If we're not in a virtualenv, all paths are considered "local."
Caution: this function assumes the head of path has been normalized
with normalize_path.
"""
if not running_under_virtualenv():
return True
return path.startswith(normalize_path(sys.prefix))
def dist_is_local(dist: Distribution) -> bool:
"""
Return True if given Distribution object is installed locally
(i.e. within current virtualenv).
Always True if we're not in a virtualenv.
"""
return is_local(dist_location(dist))
def dist_in_usersite(dist: Distribution) -> bool:
"""
Return True if given Distribution is installed in user site.
"""
return dist_location(dist).startswith(normalize_path(user_site))
def dist_in_site_packages(dist: Distribution) -> bool:
"""
Return True if given Distribution is installed in
sysconfig.get_python_lib().
"""
return dist_location(dist).startswith(normalize_path(site_packages))
def dist_in_install_path(dist):
"""
Return True if given Distribution is installed in
path matching distutils_scheme layout.
"""
norm_path = normalize_path(dist_location(dist))
return norm_path.startswith(normalize_path(
get_scheme("").purelib.split('python')[0]))
def get_distribution(req_name: str) -> Optional[Distribution]:
"""Given a requirement name, return the installed Distribution object.
This searches from *all* distributions available in the environment, to
match the behavior of ``pkg_resources.get_distribution()``.
Left for compatibility until direct pkg_resources uses are refactored out.
"""
from pip._internal.metadata import get_default_environment
from pip._internal.metadata.pkg_resources import Distribution as _Dist
dist = get_default_environment().get_distribution(req_name)
if dist is None:
return None
return cast(_Dist, dist)._dist
def dist_location(dist: Distribution) -> str:
"""
Get the site-packages location of this distribution. Generally
this is dist.location, except in the case of develop-installed
packages, where dist.location is the source code location, and we
want to know where the egg-link file is.
The returned location is normalized (in particular, with symlinks removed).
"""
egg_link = egg_link_path_from_location(dist.project_name)
if egg_link:
return normalize_path(egg_link)
return normalize_path(dist.location)
def write_output(msg: Any, *args: Any) -> None:
logger.info(msg, *args)
class StreamWrapper(StringIO):
orig_stream: TextIO = None
@classmethod
def from_stream(cls, orig_stream: TextIO) -> "StreamWrapper":
cls.orig_stream = orig_stream
return cls()
# compileall.compile_dir() needs stdout.encoding to print to stdout
# https://github.com/python/mypy/issues/4125
@property
def encoding(self): # type: ignore
return self.orig_stream.encoding
@contextlib.contextmanager
def captured_output(stream_name: str) -> Iterator[StreamWrapper]:
"""Return a context manager used by captured_stdout/stdin/stderr
that temporarily replaces the sys stream *stream_name* with a StringIO.
Taken from Lib/support/__init__.py in the CPython repo.
"""
orig_stdout = getattr(sys, stream_name)
setattr(sys, stream_name, StreamWrapper.from_stream(orig_stdout))
try:
yield getattr(sys, stream_name)
finally:
setattr(sys, stream_name, orig_stdout)
def captured_stdout() -> ContextManager[StreamWrapper]:
"""Capture the output of sys.stdout:
with captured_stdout() as stdout:
print('hello')
self.assertEqual(stdout.getvalue(), 'hello\n')
Taken from Lib/support/__init__.py in the CPython repo.
"""
return captured_output("stdout")
def captured_stderr() -> ContextManager[StreamWrapper]:
"""
See captured_stdout().
"""
return captured_output("stderr")
# Simulates an enum
def enum(*sequential: Any, **named: Any) -> Type[Any]:
enums = dict(zip(sequential, range(len(sequential))), **named)
reverse = {value: key for key, value in enums.items()}
enums["reverse_mapping"] = reverse
return type("Enum", (), enums)
def build_netloc(host: str, port: Optional[int]) -> str:
"""
Build a netloc from a host-port pair
"""
if port is None:
return host
if ":" in host:
# Only wrap host with square brackets when it is IPv6
host = f"[{host}]"
return f"{host}:{port}"
def build_url_from_netloc(netloc: str, scheme: str = "https") -> str:
"""
Build a full URL from a netloc.
"""
if netloc.count(":") >= 2 and "@" not in netloc and "[" not in netloc:
# It must be a bare IPv6 address, so wrap it with brackets.
netloc = f"[{netloc}]"
return f"{scheme}://{netloc}"
def parse_netloc(netloc: str) -> Tuple[str, Optional[int]]:
"""
Return the host-port pair from a netloc.
"""
url = build_url_from_netloc(netloc)
parsed = urllib.parse.urlparse(url)
return parsed.hostname, parsed.port
def split_auth_from_netloc(netloc: str) -> NetlocTuple:
"""
Parse out and remove the auth information from a netloc.
Returns: (netloc, (username, password)).
"""
if "@" not in netloc:
return netloc, (None, None)
# Split from the right because that's how urllib.parse.urlsplit()
# behaves if more than one @ is present (which can be checked using
# the password attribute of urlsplit()'s return value).
auth, netloc = netloc.rsplit("@", 1)
pw: Optional[str] = None
if ":" in auth:
# Split from the left because that's how urllib.parse.urlsplit()
# behaves if more than one : is present (which again can be checked
# using the password attribute of the return value)
user, pw = auth.split(":", 1)
else:
user, pw = auth, None
user = urllib.parse.unquote(user)
if pw is not None:
pw = urllib.parse.unquote(pw)
return netloc, (user, pw)
def redact_netloc(netloc: str) -> str:
"""
Replace the sensitive data in a netloc with "****", if it exists.
For example:
- "user:pass@example.com" returns "user:****@example.com"
- "accesstoken@example.com" returns "****@example.com"
"""
netloc, (user, password) = split_auth_from_netloc(netloc)
if user is None:
return netloc
if password is None:
user = "****"
password = ""
else:
user = urllib.parse.quote(user)
password = ":****"
return "{user}{password}@{netloc}".format(
user=user, password=password, netloc=netloc
)
def _transform_url(
url: str, transform_netloc: Callable[[str], Tuple[Any, ...]]
) -> Tuple[str, NetlocTuple]:
"""Transform and replace netloc in a url.
transform_netloc is a function taking the netloc and returning a
tuple. The first element of this tuple is the new netloc. The
entire tuple is returned.
Returns a tuple containing the transformed url as item 0 and the
original tuple returned by transform_netloc as item 1.
"""
purl = urllib.parse.urlsplit(url)
netloc_tuple = transform_netloc(purl.netloc)
# stripped url
url_pieces = (purl.scheme, netloc_tuple[0], purl.path, purl.query, purl.fragment)
surl = urllib.parse.urlunsplit(url_pieces)
return surl, cast("NetlocTuple", netloc_tuple)
def _get_netloc(netloc: str) -> NetlocTuple:
return split_auth_from_netloc(netloc)
def _redact_netloc(netloc: str) -> Tuple[str]:
return (redact_netloc(netloc),)
def split_auth_netloc_from_url(url: str) -> Tuple[str, str, Tuple[str, str]]:
"""
Parse a url into separate netloc, auth, and url with no auth.
Returns: (url_without_auth, netloc, (username, password))
"""
url_without_auth, (netloc, auth) = _transform_url(url, _get_netloc)
return url_without_auth, netloc, auth
def remove_auth_from_url(url: str) -> str:
"""Return a copy of url with 'username:password@' removed."""
# username/pass params are passed to subversion through flags
# and are not recognized in the url.
return _transform_url(url, _get_netloc)[0]
def redact_auth_from_url(url: str) -> str:
"""Replace the password in a given url with ****."""
return _transform_url(url, _redact_netloc)[0]
class HiddenText:
def __init__(self, secret: str, redacted: str) -> None:
self.secret = secret
self.redacted = redacted
def __repr__(self) -> str:
return "<HiddenText {!r}>".format(str(self))
def __str__(self) -> str:
return self.redacted
# This is useful for testing.
def __eq__(self, other: Any) -> bool:
if type(self) != type(other):
return False
# The string being used for redaction doesn't also have to match,
# just the raw, original string.
return self.secret == other.secret
def hide_value(value: str) -> HiddenText:
return HiddenText(value, redacted="****")
def hide_url(url: str) -> HiddenText:
redacted = redact_auth_from_url(url)
return HiddenText(url, redacted=redacted)
def protect_pip_from_modification_on_windows(modifying_pip: bool) -> None:
"""Protection of pip.exe from modification on Windows
On Windows, any operation modifying pip should be run as:
python -m pip ...
"""
pip_names = [
"pip.exe",
"pip{}.exe".format(sys.version_info[0]),
"pip{}.{}.exe".format(*sys.version_info[:2]),
]
# See https://github.com/pypa/pip/issues/1299 for more discussion
should_show_use_python_msg = (
modifying_pip and WINDOWS and os.path.basename(sys.argv[0]) in pip_names
)
if should_show_use_python_msg:
new_command = [sys.executable, "-m", "pip"] + sys.argv[1:]
raise CommandError(
"To modify pip, please run the following command:\n{}".format(
" ".join(new_command)
)
)
def is_console_interactive() -> bool:
"""Is this console interactive?"""
return sys.stdin is not None and sys.stdin.isatty()
def hash_file(path: str, blocksize: int = 1 << 20) -> Tuple[Any, int]:
"""Return (hash, length) for path using hashlib.sha256()"""
h = hashlib.sha256()
length = 0
with open(path, "rb") as f:
for block in read_chunks(f, size=blocksize):
length += len(block)
h.update(block)
return h, length
def is_wheel_installed() -> bool:
"""
Return whether the wheel package is installed.
"""
try:
import wheel # noqa: F401
except ImportError:
return False
return True
def pairwise(iterable: Iterable[Any]) -> Iterator[Tuple[Any, Any]]:
"""
Return paired elements.
For example:
s -> (s0, s1), (s2, s3), (s4, s5), ...
"""
iterable = iter(iterable)
return zip_longest(iterable, iterable)
def partition(
pred: Callable[[T], bool],
iterable: Iterable[T],
) -> Tuple[Iterable[T], Iterable[T]]:
"""
Use a predicate to partition entries into false entries and true entries,
like
partition(is_odd, range(10)) --> 0 2 4 6 8 and 1 3 5 7 9
"""
t1, t2 = tee(iterable)
return filterfalse(pred, t1), filter(pred, t2)
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