| """ |
| Abstract base classes for rich path objects. |
| |
| This module is published as a PyPI package called "pathlib-abc". |
| |
| This module is also a *PRIVATE* part of the Python standard library, where |
| it's developed alongside pathlib. If it finds success and maturity as a PyPI |
| package, it could become a public part of the standard library. |
| |
| Two base classes are defined here -- PurePathBase and PathBase -- that |
| resemble pathlib's PurePath and Path respectively. |
| """ |
| |
| import functools |
| from glob import _Globber, _no_recurse_symlinks |
| from errno import ENOENT, ENOTDIR, EBADF, ELOOP, EINVAL |
| from stat import S_ISDIR, S_ISLNK, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO |
| |
| |
| __all__ = ["UnsupportedOperation"] |
| |
| # |
| # Internals |
| # |
| |
| _WINERROR_NOT_READY = 21 # drive exists but is not accessible |
| _WINERROR_INVALID_NAME = 123 # fix for bpo-35306 |
| _WINERROR_CANT_RESOLVE_FILENAME = 1921 # broken symlink pointing to itself |
| |
| # EBADF - guard against macOS `stat` throwing EBADF |
| _IGNORED_ERRNOS = (ENOENT, ENOTDIR, EBADF, ELOOP) |
| |
| _IGNORED_WINERRORS = ( |
| _WINERROR_NOT_READY, |
| _WINERROR_INVALID_NAME, |
| _WINERROR_CANT_RESOLVE_FILENAME) |
| |
| def _ignore_error(exception): |
| return (getattr(exception, 'errno', None) in _IGNORED_ERRNOS or |
| getattr(exception, 'winerror', None) in _IGNORED_WINERRORS) |
| |
| |
| @functools.cache |
| def _is_case_sensitive(parser): |
| return parser.normcase('Aa') == 'Aa' |
| |
| |
| class UnsupportedOperation(NotImplementedError): |
| """An exception that is raised when an unsupported operation is called on |
| a path object. |
| """ |
| pass |
| |
| |
| class ParserBase: |
| """Base class for path parsers, which do low-level path manipulation. |
| |
| Path parsers provide a subset of the os.path API, specifically those |
| functions needed to provide PurePathBase functionality. Each PurePathBase |
| subclass references its path parser via a 'parser' class attribute. |
| |
| Every method in this base class raises an UnsupportedOperation exception. |
| """ |
| |
| @classmethod |
| def _unsupported_msg(cls, attribute): |
| return f"{cls.__name__}.{attribute} is unsupported" |
| |
| @property |
| def sep(self): |
| """The character used to separate path components.""" |
| raise UnsupportedOperation(self._unsupported_msg('sep')) |
| |
| def join(self, path, *paths): |
| """Join path segments.""" |
| raise UnsupportedOperation(self._unsupported_msg('join()')) |
| |
| def split(self, path): |
| """Split the path into a pair (head, tail), where *head* is everything |
| before the final path separator, and *tail* is everything after. |
| Either part may be empty. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('split()')) |
| |
| def splitdrive(self, path): |
| """Split the path into a 2-item tuple (drive, tail), where *drive* is |
| a device name or mount point, and *tail* is everything after the |
| drive. Either part may be empty.""" |
| raise UnsupportedOperation(self._unsupported_msg('splitdrive()')) |
| |
| def normcase(self, path): |
| """Normalize the case of the path.""" |
| raise UnsupportedOperation(self._unsupported_msg('normcase()')) |
| |
| def isabs(self, path): |
| """Returns whether the path is absolute, i.e. unaffected by the |
| current directory or drive.""" |
| raise UnsupportedOperation(self._unsupported_msg('isabs()')) |
| |
| |
| class PurePathBase: |
| """Base class for pure path objects. |
| |
| This class *does not* provide several magic methods that are defined in |
| its subclass PurePath. They are: __fspath__, __bytes__, __reduce__, |
| __hash__, __eq__, __lt__, __le__, __gt__, __ge__. Its initializer and path |
| joining methods accept only strings, not os.PathLike objects more broadly. |
| """ |
| |
| __slots__ = ( |
| # The `_raw_path` slot store a joined string path. This is set in the |
| # `__init__()` method. |
| '_raw_path', |
| |
| # The '_resolving' slot stores a boolean indicating whether the path |
| # is being processed by `PathBase.resolve()`. This prevents duplicate |
| # work from occurring when `resolve()` calls `stat()` or `readlink()`. |
| '_resolving', |
| ) |
| parser = ParserBase() |
| _globber = _Globber |
| |
| def __init__(self, path, *paths): |
| self._raw_path = self.parser.join(path, *paths) if paths else path |
| if not isinstance(self._raw_path, str): |
| raise TypeError( |
| f"path should be a str, not {type(self._raw_path).__name__!r}") |
| self._resolving = False |
| |
| def with_segments(self, *pathsegments): |
| """Construct a new path object from any number of path-like objects. |
| Subclasses may override this method to customize how new path objects |
| are created from methods like `iterdir()`. |
| """ |
| return type(self)(*pathsegments) |
| |
| def __str__(self): |
| """Return the string representation of the path, suitable for |
| passing to system calls.""" |
| return self._raw_path |
| |
| def as_posix(self): |
| """Return the string representation of the path with forward (/) |
| slashes.""" |
| return str(self).replace(self.parser.sep, '/') |
| |
| @property |
| def drive(self): |
| """The drive prefix (letter or UNC path), if any.""" |
| return self.parser.splitdrive(self.anchor)[0] |
| |
| @property |
| def root(self): |
| """The root of the path, if any.""" |
| return self.parser.splitdrive(self.anchor)[1] |
| |
| @property |
| def anchor(self): |
| """The concatenation of the drive and root, or ''.""" |
| return self._stack[0] |
| |
| @property |
| def name(self): |
| """The final path component, if any.""" |
| return self.parser.split(self._raw_path)[1] |
| |
| @property |
| def suffix(self): |
| """ |
| The final component's last suffix, if any. |
| |
| This includes the leading period. For example: '.txt' |
| """ |
| name = self.name |
| i = name.rfind('.') |
| if 0 < i < len(name) - 1: |
| return name[i:] |
| else: |
| return '' |
| |
| @property |
| def suffixes(self): |
| """ |
| A list of the final component's suffixes, if any. |
| |
| These include the leading periods. For example: ['.tar', '.gz'] |
| """ |
| name = self.name |
| if name.endswith('.'): |
| return [] |
| name = name.lstrip('.') |
| return ['.' + suffix for suffix in name.split('.')[1:]] |
| |
| @property |
| def stem(self): |
| """The final path component, minus its last suffix.""" |
| name = self.name |
| i = name.rfind('.') |
| if 0 < i < len(name) - 1: |
| return name[:i] |
| else: |
| return name |
| |
| def with_name(self, name): |
| """Return a new path with the file name changed.""" |
| split = self.parser.split |
| if split(name)[0]: |
| raise ValueError(f"Invalid name {name!r}") |
| return self.with_segments(split(self._raw_path)[0], name) |
| |
| def with_stem(self, stem): |
| """Return a new path with the stem changed.""" |
| suffix = self.suffix |
| if not suffix: |
| return self.with_name(stem) |
| elif not stem: |
| # If the suffix is non-empty, we can't make the stem empty. |
| raise ValueError(f"{self!r} has a non-empty suffix") |
| else: |
| return self.with_name(stem + suffix) |
| |
| def with_suffix(self, suffix): |
| """Return a new path with the file suffix changed. If the path |
| has no suffix, add given suffix. If the given suffix is an empty |
| string, remove the suffix from the path. |
| """ |
| stem = self.stem |
| if not stem: |
| # If the stem is empty, we can't make the suffix non-empty. |
| raise ValueError(f"{self!r} has an empty name") |
| elif suffix and not (suffix.startswith('.') and len(suffix) > 1): |
| raise ValueError(f"Invalid suffix {suffix!r}") |
| else: |
| return self.with_name(stem + suffix) |
| |
| def relative_to(self, other, *, walk_up=False): |
| """Return the relative path to another path identified by the passed |
| arguments. If the operation is not possible (because this is not |
| related to the other path), raise ValueError. |
| |
| The *walk_up* parameter controls whether `..` may be used to resolve |
| the path. |
| """ |
| if not isinstance(other, PurePathBase): |
| other = self.with_segments(other) |
| anchor0, parts0 = self._stack |
| anchor1, parts1 = other._stack |
| if anchor0 != anchor1: |
| raise ValueError(f"{self._raw_path!r} and {other._raw_path!r} have different anchors") |
| while parts0 and parts1 and parts0[-1] == parts1[-1]: |
| parts0.pop() |
| parts1.pop() |
| for part in parts1: |
| if not part or part == '.': |
| pass |
| elif not walk_up: |
| raise ValueError(f"{self._raw_path!r} is not in the subpath of {other._raw_path!r}") |
| elif part == '..': |
| raise ValueError(f"'..' segment in {other._raw_path!r} cannot be walked") |
| else: |
| parts0.append('..') |
| return self.with_segments('', *reversed(parts0)) |
| |
| def is_relative_to(self, other): |
| """Return True if the path is relative to another path or False. |
| """ |
| if not isinstance(other, PurePathBase): |
| other = self.with_segments(other) |
| anchor0, parts0 = self._stack |
| anchor1, parts1 = other._stack |
| if anchor0 != anchor1: |
| return False |
| while parts0 and parts1 and parts0[-1] == parts1[-1]: |
| parts0.pop() |
| parts1.pop() |
| for part in parts1: |
| if part and part != '.': |
| return False |
| return True |
| |
| @property |
| def parts(self): |
| """An object providing sequence-like access to the |
| components in the filesystem path.""" |
| anchor, parts = self._stack |
| if anchor: |
| parts.append(anchor) |
| return tuple(reversed(parts)) |
| |
| def joinpath(self, *pathsegments): |
| """Combine this path with one or several arguments, and return a |
| new path representing either a subpath (if all arguments are relative |
| paths) or a totally different path (if one of the arguments is |
| anchored). |
| """ |
| return self.with_segments(self._raw_path, *pathsegments) |
| |
| def __truediv__(self, key): |
| try: |
| return self.with_segments(self._raw_path, key) |
| except TypeError: |
| return NotImplemented |
| |
| def __rtruediv__(self, key): |
| try: |
| return self.with_segments(key, self._raw_path) |
| except TypeError: |
| return NotImplemented |
| |
| @property |
| def _stack(self): |
| """ |
| Split the path into a 2-tuple (anchor, parts), where *anchor* is the |
| uppermost parent of the path (equivalent to path.parents[-1]), and |
| *parts* is a reversed list of parts following the anchor. |
| """ |
| split = self.parser.split |
| path = self._raw_path |
| parent, name = split(path) |
| names = [] |
| while path != parent: |
| names.append(name) |
| path = parent |
| parent, name = split(path) |
| return path, names |
| |
| @property |
| def parent(self): |
| """The logical parent of the path.""" |
| path = self._raw_path |
| parent = self.parser.split(path)[0] |
| if path != parent: |
| parent = self.with_segments(parent) |
| parent._resolving = self._resolving |
| return parent |
| return self |
| |
| @property |
| def parents(self): |
| """A sequence of this path's logical parents.""" |
| split = self.parser.split |
| path = self._raw_path |
| parent = split(path)[0] |
| parents = [] |
| while path != parent: |
| parents.append(self.with_segments(parent)) |
| path = parent |
| parent = split(path)[0] |
| return tuple(parents) |
| |
| def is_absolute(self): |
| """True if the path is absolute (has both a root and, if applicable, |
| a drive).""" |
| return self.parser.isabs(self._raw_path) |
| |
| @property |
| def _pattern_str(self): |
| """The path expressed as a string, for use in pattern-matching.""" |
| return str(self) |
| |
| def match(self, path_pattern, *, case_sensitive=None): |
| """ |
| Return True if this path matches the given pattern. If the pattern is |
| relative, matching is done from the right; otherwise, the entire path |
| is matched. The recursive wildcard '**' is *not* supported by this |
| method. |
| """ |
| if not isinstance(path_pattern, PurePathBase): |
| path_pattern = self.with_segments(path_pattern) |
| if case_sensitive is None: |
| case_sensitive = _is_case_sensitive(self.parser) |
| sep = path_pattern.parser.sep |
| path_parts = self.parts[::-1] |
| pattern_parts = path_pattern.parts[::-1] |
| if not pattern_parts: |
| raise ValueError("empty pattern") |
| if len(path_parts) < len(pattern_parts): |
| return False |
| if len(path_parts) > len(pattern_parts) and path_pattern.anchor: |
| return False |
| globber = self._globber(sep, case_sensitive) |
| for path_part, pattern_part in zip(path_parts, pattern_parts): |
| match = globber.compile(pattern_part) |
| if match(path_part) is None: |
| return False |
| return True |
| |
| def full_match(self, pattern, *, case_sensitive=None): |
| """ |
| Return True if this path matches the given glob-style pattern. The |
| pattern is matched against the entire path. |
| """ |
| if not isinstance(pattern, PurePathBase): |
| pattern = self.with_segments(pattern) |
| if case_sensitive is None: |
| case_sensitive = _is_case_sensitive(self.parser) |
| globber = self._globber(pattern.parser.sep, case_sensitive, recursive=True) |
| match = globber.compile(pattern._pattern_str) |
| return match(self._pattern_str) is not None |
| |
| |
| |
| class PathBase(PurePathBase): |
| """Base class for concrete path objects. |
| |
| This class provides dummy implementations for many methods that derived |
| classes can override selectively; the default implementations raise |
| UnsupportedOperation. The most basic methods, such as stat() and open(), |
| directly raise UnsupportedOperation; these basic methods are called by |
| other methods such as is_dir() and read_text(). |
| |
| The Path class derives this class to implement local filesystem paths. |
| Users may derive their own classes to implement virtual filesystem paths, |
| such as paths in archive files or on remote storage systems. |
| """ |
| __slots__ = () |
| |
| # Maximum number of symlinks to follow in resolve() |
| _max_symlinks = 40 |
| |
| @classmethod |
| def _unsupported_msg(cls, attribute): |
| return f"{cls.__name__}.{attribute} is unsupported" |
| |
| def stat(self, *, follow_symlinks=True): |
| """ |
| Return the result of the stat() system call on this path, like |
| os.stat() does. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('stat()')) |
| |
| def lstat(self): |
| """ |
| Like stat(), except if the path points to a symlink, the symlink's |
| status information is returned, rather than its target's. |
| """ |
| return self.stat(follow_symlinks=False) |
| |
| |
| # Convenience functions for querying the stat results |
| |
| def exists(self, *, follow_symlinks=True): |
| """ |
| Whether this path exists. |
| |
| This method normally follows symlinks; to check whether a symlink exists, |
| add the argument follow_symlinks=False. |
| """ |
| try: |
| self.stat(follow_symlinks=follow_symlinks) |
| except OSError as e: |
| if not _ignore_error(e): |
| raise |
| return False |
| except ValueError: |
| # Non-encodable path |
| return False |
| return True |
| |
| def is_dir(self, *, follow_symlinks=True): |
| """ |
| Whether this path is a directory. |
| """ |
| try: |
| return S_ISDIR(self.stat(follow_symlinks=follow_symlinks).st_mode) |
| except OSError as e: |
| if not _ignore_error(e): |
| raise |
| # Path doesn't exist or is a broken symlink |
| # (see http://web.archive.org/web/20200623061726/https://bitbucket.org/pitrou/pathlib/issues/12/ ) |
| return False |
| except ValueError: |
| # Non-encodable path |
| return False |
| |
| def is_file(self, *, follow_symlinks=True): |
| """ |
| Whether this path is a regular file (also True for symlinks pointing |
| to regular files). |
| """ |
| try: |
| return S_ISREG(self.stat(follow_symlinks=follow_symlinks).st_mode) |
| except OSError as e: |
| if not _ignore_error(e): |
| raise |
| # Path doesn't exist or is a broken symlink |
| # (see http://web.archive.org/web/20200623061726/https://bitbucket.org/pitrou/pathlib/issues/12/ ) |
| return False |
| except ValueError: |
| # Non-encodable path |
| return False |
| |
| def is_mount(self): |
| """ |
| Check if this path is a mount point |
| """ |
| # Need to exist and be a dir |
| if not self.exists() or not self.is_dir(): |
| return False |
| |
| try: |
| parent_dev = self.parent.stat().st_dev |
| except OSError: |
| return False |
| |
| dev = self.stat().st_dev |
| if dev != parent_dev: |
| return True |
| ino = self.stat().st_ino |
| parent_ino = self.parent.stat().st_ino |
| return ino == parent_ino |
| |
| def is_symlink(self): |
| """ |
| Whether this path is a symbolic link. |
| """ |
| try: |
| return S_ISLNK(self.lstat().st_mode) |
| except OSError as e: |
| if not _ignore_error(e): |
| raise |
| # Path doesn't exist |
| return False |
| except ValueError: |
| # Non-encodable path |
| return False |
| |
| def is_junction(self): |
| """ |
| Whether this path is a junction. |
| """ |
| # Junctions are a Windows-only feature, not present in POSIX nor the |
| # majority of virtual filesystems. There is no cross-platform idiom |
| # to check for junctions (using stat().st_mode). |
| return False |
| |
| def is_block_device(self): |
| """ |
| Whether this path is a block device. |
| """ |
| try: |
| return S_ISBLK(self.stat().st_mode) |
| except OSError as e: |
| if not _ignore_error(e): |
| raise |
| # Path doesn't exist or is a broken symlink |
| # (see http://web.archive.org/web/20200623061726/https://bitbucket.org/pitrou/pathlib/issues/12/ ) |
| return False |
| except ValueError: |
| # Non-encodable path |
| return False |
| |
| def is_char_device(self): |
| """ |
| Whether this path is a character device. |
| """ |
| try: |
| return S_ISCHR(self.stat().st_mode) |
| except OSError as e: |
| if not _ignore_error(e): |
| raise |
| # Path doesn't exist or is a broken symlink |
| # (see http://web.archive.org/web/20200623061726/https://bitbucket.org/pitrou/pathlib/issues/12/ ) |
| return False |
| except ValueError: |
| # Non-encodable path |
| return False |
| |
| def is_fifo(self): |
| """ |
| Whether this path is a FIFO. |
| """ |
| try: |
| return S_ISFIFO(self.stat().st_mode) |
| except OSError as e: |
| if not _ignore_error(e): |
| raise |
| # Path doesn't exist or is a broken symlink |
| # (see http://web.archive.org/web/20200623061726/https://bitbucket.org/pitrou/pathlib/issues/12/ ) |
| return False |
| except ValueError: |
| # Non-encodable path |
| return False |
| |
| def is_socket(self): |
| """ |
| Whether this path is a socket. |
| """ |
| try: |
| return S_ISSOCK(self.stat().st_mode) |
| except OSError as e: |
| if not _ignore_error(e): |
| raise |
| # Path doesn't exist or is a broken symlink |
| # (see http://web.archive.org/web/20200623061726/https://bitbucket.org/pitrou/pathlib/issues/12/ ) |
| return False |
| except ValueError: |
| # Non-encodable path |
| return False |
| |
| def samefile(self, other_path): |
| """Return whether other_path is the same or not as this file |
| (as returned by os.path.samefile()). |
| """ |
| st = self.stat() |
| try: |
| other_st = other_path.stat() |
| except AttributeError: |
| other_st = self.with_segments(other_path).stat() |
| return (st.st_ino == other_st.st_ino and |
| st.st_dev == other_st.st_dev) |
| |
| def open(self, mode='r', buffering=-1, encoding=None, |
| errors=None, newline=None): |
| """ |
| Open the file pointed to by this path and return a file object, as |
| the built-in open() function does. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('open()')) |
| |
| def read_bytes(self): |
| """ |
| Open the file in bytes mode, read it, and close the file. |
| """ |
| with self.open(mode='rb') as f: |
| return f.read() |
| |
| def read_text(self, encoding=None, errors=None, newline=None): |
| """ |
| Open the file in text mode, read it, and close the file. |
| """ |
| with self.open(mode='r', encoding=encoding, errors=errors, newline=newline) as f: |
| return f.read() |
| |
| def write_bytes(self, data): |
| """ |
| Open the file in bytes mode, write to it, and close the file. |
| """ |
| # type-check for the buffer interface before truncating the file |
| view = memoryview(data) |
| with self.open(mode='wb') as f: |
| return f.write(view) |
| |
| def write_text(self, data, encoding=None, errors=None, newline=None): |
| """ |
| Open the file in text mode, write to it, and close the file. |
| """ |
| if not isinstance(data, str): |
| raise TypeError('data must be str, not %s' % |
| data.__class__.__name__) |
| with self.open(mode='w', encoding=encoding, errors=errors, newline=newline) as f: |
| return f.write(data) |
| |
| def iterdir(self): |
| """Yield path objects of the directory contents. |
| |
| The children are yielded in arbitrary order, and the |
| special entries '.' and '..' are not included. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('iterdir()')) |
| |
| def _glob_selector(self, parts, case_sensitive, recurse_symlinks): |
| if case_sensitive is None: |
| case_sensitive = _is_case_sensitive(self.parser) |
| case_pedantic = False |
| else: |
| # The user has expressed a case sensitivity choice, but we don't |
| # know the case sensitivity of the underlying filesystem, so we |
| # must use scandir() for everything, including non-wildcard parts. |
| case_pedantic = True |
| recursive = True if recurse_symlinks else _no_recurse_symlinks |
| globber = self._globber(self.parser.sep, case_sensitive, case_pedantic, recursive) |
| return globber.selector(parts) |
| |
| def glob(self, pattern, *, case_sensitive=None, recurse_symlinks=True): |
| """Iterate over this subtree and yield all existing files (of any |
| kind, including directories) matching the given relative pattern. |
| """ |
| if not isinstance(pattern, PurePathBase): |
| pattern = self.with_segments(pattern) |
| anchor, parts = pattern._stack |
| if anchor: |
| raise NotImplementedError("Non-relative patterns are unsupported") |
| select = self._glob_selector(parts, case_sensitive, recurse_symlinks) |
| return select(self) |
| |
| def rglob(self, pattern, *, case_sensitive=None, recurse_symlinks=True): |
| """Recursively yield all existing files (of any kind, including |
| directories) matching the given relative pattern, anywhere in |
| this subtree. |
| """ |
| if not isinstance(pattern, PurePathBase): |
| pattern = self.with_segments(pattern) |
| pattern = '**' / pattern |
| return self.glob(pattern, case_sensitive=case_sensitive, recurse_symlinks=recurse_symlinks) |
| |
| def walk(self, top_down=True, on_error=None, follow_symlinks=False): |
| """Walk the directory tree from this directory, similar to os.walk().""" |
| paths = [self] |
| while paths: |
| path = paths.pop() |
| if isinstance(path, tuple): |
| yield path |
| continue |
| dirnames = [] |
| filenames = [] |
| if not top_down: |
| paths.append((path, dirnames, filenames)) |
| try: |
| for child in path.iterdir(): |
| try: |
| if child.is_dir(follow_symlinks=follow_symlinks): |
| if not top_down: |
| paths.append(child) |
| dirnames.append(child.name) |
| else: |
| filenames.append(child.name) |
| except OSError: |
| filenames.append(child.name) |
| except OSError as error: |
| if on_error is not None: |
| on_error(error) |
| if not top_down: |
| while not isinstance(paths.pop(), tuple): |
| pass |
| continue |
| if top_down: |
| yield path, dirnames, filenames |
| paths += [path.joinpath(d) for d in reversed(dirnames)] |
| |
| def absolute(self): |
| """Return an absolute version of this path |
| No normalization or symlink resolution is performed. |
| |
| Use resolve() to resolve symlinks and remove '..' segments. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('absolute()')) |
| |
| @classmethod |
| def cwd(cls): |
| """Return a new path pointing to the current working directory.""" |
| # We call 'absolute()' rather than using 'os.getcwd()' directly to |
| # enable users to replace the implementation of 'absolute()' in a |
| # subclass and benefit from the new behaviour here. This works because |
| # os.path.abspath('.') == os.getcwd(). |
| return cls('').absolute() |
| |
| def expanduser(self): |
| """ Return a new path with expanded ~ and ~user constructs |
| (as returned by os.path.expanduser) |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('expanduser()')) |
| |
| @classmethod |
| def home(cls): |
| """Return a new path pointing to expanduser('~'). |
| """ |
| return cls("~").expanduser() |
| |
| def readlink(self): |
| """ |
| Return the path to which the symbolic link points. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('readlink()')) |
| readlink._supported = False |
| |
| def resolve(self, strict=False): |
| """ |
| Make the path absolute, resolving all symlinks on the way and also |
| normalizing it. |
| """ |
| if self._resolving: |
| return self |
| path_root, parts = self._stack |
| path = self.with_segments(path_root) |
| try: |
| path = path.absolute() |
| except UnsupportedOperation: |
| path_tail = [] |
| else: |
| path_root, path_tail = path._stack |
| path_tail.reverse() |
| |
| # If the user has *not* overridden the `readlink()` method, then symlinks are unsupported |
| # and (in non-strict mode) we can improve performance by not calling `stat()`. |
| querying = strict or getattr(self.readlink, '_supported', True) |
| link_count = 0 |
| while parts: |
| part = parts.pop() |
| if not part or part == '.': |
| continue |
| if part == '..': |
| if not path_tail: |
| if path_root: |
| # Delete '..' segment immediately following root |
| continue |
| elif path_tail[-1] != '..': |
| # Delete '..' segment and its predecessor |
| path_tail.pop() |
| continue |
| path_tail.append(part) |
| if querying and part != '..': |
| path = self.with_segments(path_root + self.parser.sep.join(path_tail)) |
| path._resolving = True |
| try: |
| st = path.stat(follow_symlinks=False) |
| if S_ISLNK(st.st_mode): |
| # Like Linux and macOS, raise OSError(errno.ELOOP) if too many symlinks are |
| # encountered during resolution. |
| link_count += 1 |
| if link_count >= self._max_symlinks: |
| raise OSError(ELOOP, "Too many symbolic links in path", self._raw_path) |
| target_root, target_parts = path.readlink()._stack |
| # If the symlink target is absolute (like '/etc/hosts'), set the current |
| # path to its uppermost parent (like '/'). |
| if target_root: |
| path_root = target_root |
| path_tail.clear() |
| else: |
| path_tail.pop() |
| # Add the symlink target's reversed tail parts (like ['hosts', 'etc']) to |
| # the stack of unresolved path parts. |
| parts.extend(target_parts) |
| continue |
| elif parts and not S_ISDIR(st.st_mode): |
| raise NotADirectoryError(ENOTDIR, "Not a directory", self._raw_path) |
| except OSError: |
| if strict: |
| raise |
| else: |
| querying = False |
| return self.with_segments(path_root + self.parser.sep.join(path_tail)) |
| |
| def symlink_to(self, target, target_is_directory=False): |
| """ |
| Make this path a symlink pointing to the target path. |
| Note the order of arguments (link, target) is the reverse of os.symlink. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('symlink_to()')) |
| |
| def hardlink_to(self, target): |
| """ |
| Make this path a hard link pointing to the same file as *target*. |
| |
| Note the order of arguments (self, target) is the reverse of os.link's. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('hardlink_to()')) |
| |
| def touch(self, mode=0o666, exist_ok=True): |
| """ |
| Create this file with the given access mode, if it doesn't exist. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('touch()')) |
| |
| def mkdir(self, mode=0o777, parents=False, exist_ok=False): |
| """ |
| Create a new directory at this given path. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('mkdir()')) |
| |
| def rename(self, target): |
| """ |
| Rename this path to the target path. |
| |
| The target path may be absolute or relative. Relative paths are |
| interpreted relative to the current working directory, *not* the |
| directory of the Path object. |
| |
| Returns the new Path instance pointing to the target path. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('rename()')) |
| |
| def replace(self, target): |
| """ |
| Rename this path to the target path, overwriting if that path exists. |
| |
| The target path may be absolute or relative. Relative paths are |
| interpreted relative to the current working directory, *not* the |
| directory of the Path object. |
| |
| Returns the new Path instance pointing to the target path. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('replace()')) |
| |
| def chmod(self, mode, *, follow_symlinks=True): |
| """ |
| Change the permissions of the path, like os.chmod(). |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('chmod()')) |
| |
| def lchmod(self, mode): |
| """ |
| Like chmod(), except if the path points to a symlink, the symlink's |
| permissions are changed, rather than its target's. |
| """ |
| self.chmod(mode, follow_symlinks=False) |
| |
| def unlink(self, missing_ok=False): |
| """ |
| Remove this file or link. |
| If the path is a directory, use rmdir() instead. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('unlink()')) |
| |
| def rmdir(self): |
| """ |
| Remove this directory. The directory must be empty. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('rmdir()')) |
| |
| def owner(self, *, follow_symlinks=True): |
| """ |
| Return the login name of the file owner. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('owner()')) |
| |
| def group(self, *, follow_symlinks=True): |
| """ |
| Return the group name of the file gid. |
| """ |
| raise UnsupportedOperation(self._unsupported_msg('group()')) |
| |
| @classmethod |
| def from_uri(cls, uri): |
| """Return a new path from the given 'file' URI.""" |
| raise UnsupportedOperation(cls._unsupported_msg('from_uri()')) |
| |
| def as_uri(self): |
| """Return the path as a URI.""" |
| raise UnsupportedOperation(self._unsupported_msg('as_uri()')) |
