Edit: filesystem.py
import errno import fnmatch import os import os.path import random import shutil import stat import sys from contextlib import contextmanager from tempfile import NamedTemporaryFile # NOTE: retrying is not annotated in typeshed as on 2017-07-17, which is # why we ignore the type on this import. from pip._vendor.retrying import retry # type: ignore from pip._vendor.six import PY2 from pip._internal.utils.compat import get_path_uid from pip._internal.utils.misc import format_size from pip._internal.utils.typing import MYPY_CHECK_RUNNING, cast if MYPY_CHECK_RUNNING: from typing import Any, BinaryIO, Iterator, List, Union class NamedTemporaryFileResult(BinaryIO): @property def file(self): # type: () -> BinaryIO pass def check_path_owner(path): # type: (str) -> bool # If we don't have a way to check the effective uid of this process, then # we'll just assume that we own the directory. if sys.platform == "win32" or not hasattr(os, "geteuid"): return True assert os.path.isabs(path) previous = None while path != previous: if os.path.lexists(path): # Check if path is writable by current user. if os.geteuid() == 0: # Special handling for root user in order to handle properly # cases where users use sudo without -H flag. try: path_uid = get_path_uid(path) except OSError: return False return path_uid == 0 else: return os.access(path, os.W_OK) else: previous, path = path, os.path.dirname(path) return False # assume we don't own the path def copy2_fixed(src, dest): # type: (str, str) -> None """Wrap shutil.copy2() but map errors copying socket files to SpecialFileError as expected. See also https://bugs.python.org/issue37700. """ try: shutil.copy2(src, dest) except (OSError, IOError): for f in [src, dest]: try: is_socket_file = is_socket(f) except OSError: # An error has already occurred. Another error here is not # a problem and we can ignore it. pass else: if is_socket_file: raise shutil.SpecialFileError( "`{f}` is a socket".format(**locals())) raise def is_socket(path): # type: (str) -> bool return stat.S_ISSOCK(os.lstat(path).st_mode) @contextmanager def adjacent_tmp_file(path, **kwargs): # type: (str, **Any) -> Iterator[NamedTemporaryFileResult] """Return a file-like object pointing to a tmp file next to path. The file is created securely and is ensured to be written to disk after the context reaches its end. kwargs will be passed to tempfile.NamedTemporaryFile to control the way the temporary file will be opened. """ with NamedTemporaryFile( delete=False, dir=os.path.dirname(path), prefix=os.path.basename(path), suffix='.tmp', **kwargs ) as f: result = cast('NamedTemporaryFileResult', f) try: yield result finally: result.file.flush() os.fsync(result.file.fileno()) _replace_retry = retry(stop_max_delay=1000, wait_fixed=250) if PY2: @_replace_retry def replace(src, dest): # type: (str, str) -> None try: os.rename(src, dest) except OSError: os.remove(dest) os.rename(src, dest) else: replace = _replace_retry(os.replace) # test_writable_dir and _test_writable_dir_win are copied from Flit, # with the author's agreement to also place them under pip's license. def test_writable_dir(path): # type: (str) -> bool """Check if a directory is writable. Uses os.access() on POSIX, tries creating files on Windows. """ # If the directory doesn't exist, find the closest parent that does. while not os.path.isdir(path): parent = os.path.dirname(path) if parent == path: break # Should never get here, but infinite loops are bad path = parent if os.name == 'posix': return os.access(path, os.W_OK) return _test_writable_dir_win(path) def _test_writable_dir_win(path): # type: (str) -> bool # os.access doesn't work on Windows: http://bugs.python.org/issue2528 # and we can't use tempfile: http://bugs.python.org/issue22107 basename = 'accesstest_deleteme_fishfingers_custard_' alphabet = 'abcdefghijklmnopqrstuvwxyz0123456789' for _ in range(10): name = basename + ''.join(random.choice(alphabet) for _ in range(6)) file = os.path.join(path, name) try: fd = os.open(file, os.O_RDWR | os.O_CREAT | os.O_EXCL) # Python 2 doesn't support FileExistsError and PermissionError. except OSError as e: # exception FileExistsError if e.errno == errno.EEXIST: continue # exception PermissionError if e.errno == errno.EPERM or e.errno == errno.EACCES: # This could be because there's a directory with the same name. # But it's highly unlikely there's a directory called that, # so we'll assume it's because the parent dir is not writable. # This could as well be because the parent dir is not readable, # due to non-privileged user access. return False raise else: os.close(fd) os.unlink(file) return True # This should never be reached raise EnvironmentError( 'Unexpected condition testing for writable directory' ) def find_files(path, pattern): # type: (str, str) -> List[str] """Returns a list of absolute paths of files beneath path, recursively, with filenames which match the UNIX-style shell glob pattern.""" result = [] # type: List[str] for root, _, files in os.walk(path): matches = fnmatch.filter(files, pattern) result.extend(os.path.join(root, f) for f in matches) return result def file_size(path): # type: (str) -> Union[int, float] # If it's a symlink, return 0. if os.path.islink(path): return 0 return os.path.getsize(path) def format_file_size(path): # type: (str) -> str return format_size(file_size(path)) def directory_size(path): # type: (str) -> Union[int, float] size = 0.0 for root, _dirs, files in os.walk(path): for filename in files: file_path = os.path.join(root, filename) size += file_size(file_path) return size def format_directory_size(path): # type: (str) -> str return format_size(directory_size(path))
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