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helpers.py
# Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Helper classes use for fake file system implementation.""" import io import locale import os import platform import stat import sys import time from copy import copy from stat import S_IFLNK from typing import Union, Optional, Any, AnyStr, overload, cast AnyString = Union[str, bytes] AnyPath = Union[AnyStr, os.PathLike] IS_PYPY = platform.python_implementation() == "PyPy" IS_WIN = sys.platform == "win32" IN_DOCKER = os.path.exists("/.dockerenv") PERM_READ = 0o400 # Read permission bit. PERM_WRITE = 0o200 # Write permission bit. PERM_EXE = 0o100 # Execute permission bit. PERM_DEF = 0o777 # Default permission bits. PERM_DEF_FILE = 0o666 # Default permission bits (regular file) PERM_ALL = 0o7777 # All permission bits. if sys.platform == "win32": USER_ID = 1 GROUP_ID = 1 else: USER_ID = os.getuid() GROUP_ID = os.getgid() def get_uid() -> int: """Get the global user id. Same as ``os.getuid()``""" return USER_ID def set_uid(uid: int) -> None: """Set the global user id. This is used as st_uid for new files and to differentiate between a normal user and the root user (uid 0). For the root user, some permission restrictions are ignored. Args: uid: (int) the user ID of the user calling the file system functions. """ global USER_ID USER_ID = uid def get_gid() -> int: """Get the global group id. Same as ``os.getgid()``""" return GROUP_ID def set_gid(gid: int) -> None: """Set the global group id. This is only used to set st_gid for new files, no permission checks are performed. Args: gid: (int) the group ID of the user calling the file system functions. """ global GROUP_ID GROUP_ID = gid def reset_ids() -> None: """Set the global user ID and group ID back to default values.""" if sys.platform == "win32": set_uid(1) set_gid(1) else: set_uid(os.getuid()) set_gid(os.getgid()) def is_root() -> bool: """Return True if the current user is the root user.""" return USER_ID == 0 def is_int_type(val: Any) -> bool: """Return True if `val` is of integer type.""" return isinstance(val, int) def is_byte_string(val: Any) -> bool: """Return True if `val` is a bytes-like object, False for a unicode string.""" return not hasattr(val, "encode") def is_unicode_string(val: Any) -> bool: """Return True if `val` is a unicode string, False for a bytes-like object.""" return hasattr(val, "encode") @overload def make_string_path(dir_name: AnyStr) -> AnyStr: ... @overload def make_string_path(dir_name: os.PathLike) -> str: ... def make_string_path(dir_name: AnyPath) -> AnyStr: return cast(AnyStr, os.fspath(dir_name)) # pytype: disable=invalid-annotation def to_string(path: Union[AnyStr, Union[str, bytes]]) -> str: """Return the string representation of a byte string using the preferred encoding, or the string itself if path is a str.""" if isinstance(path, bytes): return path.decode(locale.getpreferredencoding(False)) return path def to_bytes(path: Union[AnyStr, Union[str, bytes]]) -> bytes: """Return the bytes representation of a string using the preferred encoding, or the byte string itself if path is a byte string.""" if isinstance(path, str): return bytes(path, locale.getpreferredencoding(False)) return path def join_strings(s1: AnyStr, s2: AnyStr) -> AnyStr: """This is a bit of a hack to satisfy mypy - may be refactored.""" return s1 + s2 def real_encoding(encoding: Optional[str]) -> Optional[str]: """Since Python 3.10, the new function ``io.text_encoding`` returns "locale" as the encoding if None is defined. This will be handled as no encoding in pyfakefs.""" if sys.version_info >= (3, 10): return encoding if encoding != "locale" else None return encoding def now(): return time.time() @overload def matching_string(matched: bytes, string: AnyStr) -> bytes: ... @overload def matching_string(matched: str, string: AnyStr) -> str: ... @overload def matching_string(matched: AnyStr, string: None) -> None: ... def matching_string( # type: ignore[misc] matched: AnyStr, string: Optional[AnyStr] ) -> Optional[AnyString]: """Return the string as byte or unicode depending on the type of matched, assuming string is an ASCII string. """ if string is None: return string if isinstance(matched, bytes) and isinstance(string, str): return string.encode(locale.getpreferredencoding(False)) return string # pytype: disable=bad-return-type class FakeStatResult: """Mimics os.stat_result for use as return type of `stat()` and similar. This is needed as `os.stat_result` has no possibility to set nanosecond times directly. """ def __init__( self, is_windows: bool, user_id: int, group_id: int, initial_time: Optional[float] = None, ): self.st_mode: int = 0 self.st_ino: Optional[int] = None self.st_dev: int = 0 self.st_nlink: int = 0 self.st_uid: int = user_id self.st_gid: int = group_id self._st_size: int = 0 self.is_windows: bool = is_windows self._st_atime_ns: int = int((initial_time or 0) * 1e9) self._st_mtime_ns: int = self._st_atime_ns self._st_ctime_ns: int = self._st_atime_ns def __eq__(self, other: Any) -> bool: return ( isinstance(other, FakeStatResult) and self._st_atime_ns == other._st_atime_ns and self._st_ctime_ns == other._st_ctime_ns and self._st_mtime_ns == other._st_mtime_ns and self.st_size == other.st_size and self.st_gid == other.st_gid and self.st_uid == other.st_uid and self.st_nlink == other.st_nlink and self.st_dev == other.st_dev and self.st_ino == other.st_ino and self.st_mode == other.st_mode ) def __ne__(self, other: Any) -> bool: return not self == other def copy(self) -> "FakeStatResult": """Return a copy where the float usage is hard-coded to mimic the behavior of the real os.stat_result. """ stat_result = copy(self) return stat_result def set_from_stat_result(self, stat_result: os.stat_result) -> None: """Set values from a real os.stat_result. Note: values that are controlled by the fake filesystem are not set. This includes st_ino, st_dev and st_nlink. """ self.st_mode = stat_result.st_mode self.st_uid = stat_result.st_uid self.st_gid = stat_result.st_gid self._st_size = stat_result.st_size self._st_atime_ns = stat_result.st_atime_ns self._st_mtime_ns = stat_result.st_mtime_ns self._st_ctime_ns = stat_result.st_ctime_ns @property def st_ctime(self) -> Union[int, float]: """Return the creation time in seconds.""" return self._st_ctime_ns / 1e9 @st_ctime.setter def st_ctime(self, val: Union[int, float]) -> None: """Set the creation time in seconds.""" self._st_ctime_ns = int(val * 1e9) @property def st_atime(self) -> Union[int, float]: """Return the access time in seconds.""" return self._st_atime_ns / 1e9 @st_atime.setter def st_atime(self, val: Union[int, float]) -> None: """Set the access time in seconds.""" self._st_atime_ns = int(val * 1e9) @property def st_mtime(self) -> Union[int, float]: """Return the modification time in seconds.""" return self._st_mtime_ns / 1e9 @st_mtime.setter def st_mtime(self, val: Union[int, float]) -> None: """Set the modification time in seconds.""" self._st_mtime_ns = int(val * 1e9) @property def st_size(self) -> int: if self.st_mode & S_IFLNK == S_IFLNK and self.is_windows: return 0 return self._st_size @st_size.setter def st_size(self, val: int) -> None: self._st_size = val @property def st_blocks(self) -> int: """Return the number of 512-byte blocks allocated for the file. Assumes a page size of 4096 (matches most systems). Ignores that this may not be available under some systems, and that the result may differ if the file has holes. """ if self.is_windows: raise AttributeError("'os.stat_result' object has no attribute 'st_blocks'") page_size = 4096 blocks_in_page = page_size // 512 pages = self._st_size // page_size if self._st_size % page_size: pages += 1 return pages * blocks_in_page @property def st_file_attributes(self) -> int: if not self.is_windows: raise AttributeError( "module 'os.stat_result' " "has no attribute 'st_file_attributes'" ) mode = 0 st_mode = self.st_mode if st_mode & stat.S_IFDIR: mode |= stat.FILE_ATTRIBUTE_DIRECTORY # type:ignore[attr-defined] if st_mode & stat.S_IFREG: mode |= stat.FILE_ATTRIBUTE_NORMAL # type:ignore[attr-defined] if st_mode & (stat.S_IFCHR | stat.S_IFBLK): mode |= stat.FILE_ATTRIBUTE_DEVICE # type:ignore[attr-defined] if st_mode & stat.S_IFLNK: mode |= stat.FILE_ATTRIBUTE_REPARSE_POINT # type:ignore return mode @property def st_reparse_tag(self) -> int: if not self.is_windows or sys.version_info < (3, 8): raise AttributeError( "module 'os.stat_result' " "has no attribute 'st_reparse_tag'" ) if self.st_mode & stat.S_IFLNK: return stat.IO_REPARSE_TAG_SYMLINK # type: ignore[attr-defined] return 0 def __getitem__(self, item: int) -> Optional[int]: """Implement item access to mimic `os.stat_result` behavior.""" import stat if item == stat.ST_MODE: return self.st_mode if item == stat.ST_INO: return self.st_ino if item == stat.ST_DEV: return self.st_dev if item == stat.ST_NLINK: return self.st_nlink if item == stat.ST_UID: return self.st_uid if item == stat.ST_GID: return self.st_gid if item == stat.ST_SIZE: return self.st_size if item == stat.ST_ATIME: # item access always returns int for backward compatibility return int(self.st_atime) if item == stat.ST_MTIME: return int(self.st_mtime) if item == stat.ST_CTIME: return int(self.st_ctime) raise ValueError("Invalid item") @property def st_atime_ns(self) -> int: """Return the access time in nanoseconds.""" return self._st_atime_ns @st_atime_ns.setter def st_atime_ns(self, val: int) -> None: """Set the access time in nanoseconds.""" self._st_atime_ns = val @property def st_mtime_ns(self) -> int: """Return the modification time in nanoseconds.""" return self._st_mtime_ns @st_mtime_ns.setter def st_mtime_ns(self, val: int) -> None: """Set the modification time of the fake file in nanoseconds.""" self._st_mtime_ns = val @property def st_ctime_ns(self) -> int: """Return the creation time in nanoseconds.""" return self._st_ctime_ns @st_ctime_ns.setter def st_ctime_ns(self, val: int) -> None: """Set the creation time of the fake file in nanoseconds.""" self._st_ctime_ns = val class BinaryBufferIO(io.BytesIO): """Stream class that handles byte contents for files.""" def __init__(self, contents: Optional[bytes]): super().__init__(contents or b"") def putvalue(self, value: bytes) -> None: self.write(value) class TextBufferIO(io.TextIOWrapper): """Stream class that handles Python string contents for files.""" def __init__( self, contents: Optional[bytes] = None, newline: Optional[str] = None, encoding: Optional[str] = None, errors: str = "strict", ): self._bytestream = io.BytesIO(contents or b"") super().__init__(self._bytestream, encoding, errors, newline) def getvalue(self) -> bytes: return self._bytestream.getvalue() def putvalue(self, value: bytes) -> None: self._bytestream.write(value)
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