| """Utility functions for copying and archiving files and directory trees. |
| |
| XXX The functions here don't copy the resource fork or other metadata on Mac. |
| |
| """ |
| |
| import os |
| import sys |
| import stat |
| import fnmatch |
| import collections |
| import errno |
| |
| try: |
| import zlib |
| del zlib |
| _ZLIB_SUPPORTED = True |
| except ImportError: |
| _ZLIB_SUPPORTED = False |
| |
| try: |
| import bz2 |
| del bz2 |
| _BZ2_SUPPORTED = True |
| except ImportError: |
| _BZ2_SUPPORTED = False |
| |
| try: |
| import lzma |
| del lzma |
| _LZMA_SUPPORTED = True |
| except ImportError: |
| _LZMA_SUPPORTED = False |
| |
| try: |
| from pwd import getpwnam |
| except ImportError: |
| getpwnam = None |
| |
| try: |
| from grp import getgrnam |
| except ImportError: |
| getgrnam = None |
| |
| _WINDOWS = os.name == 'nt' |
| posix = nt = None |
| if os.name == 'posix': |
| import posix |
| elif _WINDOWS: |
| import nt |
| |
| COPY_BUFSIZE = 1024 * 1024 if _WINDOWS else 64 * 1024 |
| _USE_CP_SENDFILE = hasattr(os, "sendfile") and sys.platform.startswith("linux") |
| _HAS_FCOPYFILE = posix and hasattr(posix, "_fcopyfile") # macOS |
| |
| # CMD defaults in Windows 10 |
| _WIN_DEFAULT_PATHEXT = ".COM;.EXE;.BAT;.CMD;.VBS;.JS;.WS;.MSC" |
| |
| __all__ = ["copyfileobj", "copyfile", "copymode", "copystat", "copy", "copy2", |
| "copytree", "move", "rmtree", "Error", "SpecialFileError", |
| "ExecError", "make_archive", "get_archive_formats", |
| "register_archive_format", "unregister_archive_format", |
| "get_unpack_formats", "register_unpack_format", |
| "unregister_unpack_format", "unpack_archive", |
| "ignore_patterns", "chown", "which", "get_terminal_size", |
| "SameFileError"] |
| # disk_usage is added later, if available on the platform |
| |
| class Error(OSError): |
| pass |
| |
| class SameFileError(Error): |
| """Raised when source and destination are the same file.""" |
| |
| class SpecialFileError(OSError): |
| """Raised when trying to do a kind of operation (e.g. copying) which is |
| not supported on a special file (e.g. a named pipe)""" |
| |
| class ExecError(OSError): |
| """Raised when a command could not be executed""" |
| |
| class ReadError(OSError): |
| """Raised when an archive cannot be read""" |
| |
| class RegistryError(Exception): |
| """Raised when a registry operation with the archiving |
| and unpacking registries fails""" |
| |
| class _GiveupOnFastCopy(Exception): |
| """Raised as a signal to fallback on using raw read()/write() |
| file copy when fast-copy functions fail to do so. |
| """ |
| |
| def _fastcopy_fcopyfile(fsrc, fdst, flags): |
| """Copy a regular file content or metadata by using high-performance |
| fcopyfile(3) syscall (macOS). |
| """ |
| try: |
| infd = fsrc.fileno() |
| outfd = fdst.fileno() |
| except Exception as err: |
| raise _GiveupOnFastCopy(err) # not a regular file |
| |
| try: |
| posix._fcopyfile(infd, outfd, flags) |
| except OSError as err: |
| err.filename = fsrc.name |
| err.filename2 = fdst.name |
| if err.errno in {errno.EINVAL, errno.ENOTSUP}: |
| raise _GiveupOnFastCopy(err) |
| else: |
| raise err from None |
| |
| def _fastcopy_sendfile(fsrc, fdst): |
| """Copy data from one regular mmap-like fd to another by using |
| high-performance sendfile(2) syscall. |
| This should work on Linux >= 2.6.33 only. |
| """ |
| # Note: copyfileobj() is left alone in order to not introduce any |
| # unexpected breakage. Possible risks by using zero-copy calls |
| # in copyfileobj() are: |
| # - fdst cannot be open in "a"(ppend) mode |
| # - fsrc and fdst may be open in "t"(ext) mode |
| # - fsrc may be a BufferedReader (which hides unread data in a buffer), |
| # GzipFile (which decompresses data), HTTPResponse (which decodes |
| # chunks). |
| # - possibly others (e.g. encrypted fs/partition?) |
| global _USE_CP_SENDFILE |
| try: |
| infd = fsrc.fileno() |
| outfd = fdst.fileno() |
| except Exception as err: |
| raise _GiveupOnFastCopy(err) # not a regular file |
| |
| # Hopefully the whole file will be copied in a single call. |
| # sendfile() is called in a loop 'till EOF is reached (0 return) |
| # so a bufsize smaller or bigger than the actual file size |
| # should not make any difference, also in case the file content |
| # changes while being copied. |
| try: |
| blocksize = max(os.fstat(infd).st_size, 2 ** 23) # min 8MiB |
| except OSError: |
| blocksize = 2 ** 27 # 128MiB |
| # On 32-bit architectures truncate to 1GiB to avoid OverflowError, |
| # see bpo-38319. |
| if sys.maxsize < 2 ** 32: |
| blocksize = min(blocksize, 2 ** 30) |
| |
| offset = 0 |
| while True: |
| try: |
| sent = os.sendfile(outfd, infd, offset, blocksize) |
| except OSError as err: |
| # ...in oder to have a more informative exception. |
| err.filename = fsrc.name |
| err.filename2 = fdst.name |
| |
| if err.errno == errno.ENOTSOCK: |
| # sendfile() on this platform (probably Linux < 2.6.33) |
| # does not support copies between regular files (only |
| # sockets). |
| _USE_CP_SENDFILE = False |
| raise _GiveupOnFastCopy(err) |
| |
| if err.errno == errno.ENOSPC: # filesystem is full |
| raise err from None |
| |
| # Give up on first call and if no data was copied. |
| if offset == 0 and os.lseek(outfd, 0, os.SEEK_CUR) == 0: |
| raise _GiveupOnFastCopy(err) |
| |
| raise err |
| else: |
| if sent == 0: |
| break # EOF |
| offset += sent |
| |
| def _copyfileobj_readinto(fsrc, fdst, length=COPY_BUFSIZE): |
| """readinto()/memoryview() based variant of copyfileobj(). |
| *fsrc* must support readinto() method and both files must be |
| open in binary mode. |
| """ |
| # Localize variable access to minimize overhead. |
| fsrc_readinto = fsrc.readinto |
| fdst_write = fdst.write |
| with memoryview(bytearray(length)) as mv: |
| while True: |
| n = fsrc_readinto(mv) |
| if not n: |
| break |
| elif n < length: |
| with mv[:n] as smv: |
| fdst.write(smv) |
| else: |
| fdst_write(mv) |
| |
| def copyfileobj(fsrc, fdst, length=0): |
| """copy data from file-like object fsrc to file-like object fdst""" |
| # Localize variable access to minimize overhead. |
| if not length: |
| length = COPY_BUFSIZE |
| fsrc_read = fsrc.read |
| fdst_write = fdst.write |
| while True: |
| buf = fsrc_read(length) |
| if not buf: |
| break |
| fdst_write(buf) |
| |
| def _samefile(src, dst): |
| # Macintosh, Unix. |
| if isinstance(src, os.DirEntry) and hasattr(os.path, 'samestat'): |
| try: |
| return os.path.samestat(src.stat(), os.stat(dst)) |
| except OSError: |
| return False |
| |
| if hasattr(os.path, 'samefile'): |
| try: |
| return os.path.samefile(src, dst) |
| except OSError: |
| return False |
| |
| # All other platforms: check for same pathname. |
| return (os.path.normcase(os.path.abspath(src)) == |
| os.path.normcase(os.path.abspath(dst))) |
| |
| def _stat(fn): |
| return fn.stat() if isinstance(fn, os.DirEntry) else os.stat(fn) |
| |
| def _islink(fn): |
| return fn.is_symlink() if isinstance(fn, os.DirEntry) else os.path.islink(fn) |
| |
| def copyfile(src, dst, *, follow_symlinks=True): |
| """Copy data from src to dst in the most efficient way possible. |
| |
| If follow_symlinks is not set and src is a symbolic link, a new |
| symlink will be created instead of copying the file it points to. |
| |
| """ |
| sys.audit("shutil.copyfile", src, dst) |
| |
| if _samefile(src, dst): |
| raise SameFileError("{!r} and {!r} are the same file".format(src, dst)) |
| |
| file_size = 0 |
| for i, fn in enumerate([src, dst]): |
| try: |
| st = _stat(fn) |
| except OSError: |
| # File most likely does not exist |
| pass |
| else: |
| # XXX What about other special files? (sockets, devices...) |
| if stat.S_ISFIFO(st.st_mode): |
| fn = fn.path if isinstance(fn, os.DirEntry) else fn |
| raise SpecialFileError("`%s` is a named pipe" % fn) |
| if _WINDOWS and i == 0: |
| file_size = st.st_size |
| |
| if not follow_symlinks and _islink(src): |
| os.symlink(os.readlink(src), dst) |
| else: |
| with open(src, 'rb') as fsrc, open(dst, 'wb') as fdst: |
| # macOS |
| if _HAS_FCOPYFILE: |
| try: |
| _fastcopy_fcopyfile(fsrc, fdst, posix._COPYFILE_DATA) |
| return dst |
| except _GiveupOnFastCopy: |
| pass |
| # Linux |
| elif _USE_CP_SENDFILE: |
| try: |
| _fastcopy_sendfile(fsrc, fdst) |
| return dst |
| except _GiveupOnFastCopy: |
| pass |
| # Windows, see: |
| # https://github.com/python/cpython/pull/7160#discussion_r195405230 |
| elif _WINDOWS and file_size > 0: |
| _copyfileobj_readinto(fsrc, fdst, min(file_size, COPY_BUFSIZE)) |
| return dst |
| |
| copyfileobj(fsrc, fdst) |
| |
| return dst |
| |
| def copymode(src, dst, *, follow_symlinks=True): |
| """Copy mode bits from src to dst. |
| |
| If follow_symlinks is not set, symlinks aren't followed if and only |
| if both `src` and `dst` are symlinks. If `lchmod` isn't available |
| (e.g. Linux) this method does nothing. |
| |
| """ |
| sys.audit("shutil.copymode", src, dst) |
| |
| if not follow_symlinks and _islink(src) and os.path.islink(dst): |
| if hasattr(os, 'lchmod'): |
| stat_func, chmod_func = os.lstat, os.lchmod |
| else: |
| return |
| else: |
| stat_func, chmod_func = _stat, os.chmod |
| |
| st = stat_func(src) |
| chmod_func(dst, stat.S_IMODE(st.st_mode)) |
| |
| if hasattr(os, 'listxattr'): |
| def _copyxattr(src, dst, *, follow_symlinks=True): |
| """Copy extended filesystem attributes from `src` to `dst`. |
| |
| Overwrite existing attributes. |
| |
| If `follow_symlinks` is false, symlinks won't be followed. |
| |
| """ |
| |
| try: |
| names = os.listxattr(src, follow_symlinks=follow_symlinks) |
| except OSError as e: |
| if e.errno not in (errno.ENOTSUP, errno.ENODATA, errno.EINVAL): |
| raise |
| return |
| for name in names: |
| try: |
| value = os.getxattr(src, name, follow_symlinks=follow_symlinks) |
| os.setxattr(dst, name, value, follow_symlinks=follow_symlinks) |
| except OSError as e: |
| if e.errno not in (errno.EPERM, errno.ENOTSUP, errno.ENODATA, |
| errno.EINVAL): |
| raise |
| else: |
| def _copyxattr(*args, **kwargs): |
| pass |
| |
| def copystat(src, dst, *, follow_symlinks=True): |
| """Copy file metadata |
| |
| Copy the permission bits, last access time, last modification time, and |
| flags from `src` to `dst`. On Linux, copystat() also copies the "extended |
| attributes" where possible. The file contents, owner, and group are |
| unaffected. `src` and `dst` are path-like objects or path names given as |
| strings. |
| |
| If the optional flag `follow_symlinks` is not set, symlinks aren't |
| followed if and only if both `src` and `dst` are symlinks. |
| """ |
| sys.audit("shutil.copystat", src, dst) |
| |
| def _nop(*args, ns=None, follow_symlinks=None): |
| pass |
| |
| # follow symlinks (aka don't not follow symlinks) |
| follow = follow_symlinks or not (_islink(src) and os.path.islink(dst)) |
| if follow: |
| # use the real function if it exists |
| def lookup(name): |
| return getattr(os, name, _nop) |
| else: |
| # use the real function only if it exists |
| # *and* it supports follow_symlinks |
| def lookup(name): |
| fn = getattr(os, name, _nop) |
| if fn in os.supports_follow_symlinks: |
| return fn |
| return _nop |
| |
| if isinstance(src, os.DirEntry): |
| st = src.stat(follow_symlinks=follow) |
| else: |
| st = lookup("stat")(src, follow_symlinks=follow) |
| mode = stat.S_IMODE(st.st_mode) |
| lookup("utime")(dst, ns=(st.st_atime_ns, st.st_mtime_ns), |
| follow_symlinks=follow) |
| # We must copy extended attributes before the file is (potentially) |
| # chmod()'ed read-only, otherwise setxattr() will error with -EACCES. |
| _copyxattr(src, dst, follow_symlinks=follow) |
| try: |
| lookup("chmod")(dst, mode, follow_symlinks=follow) |
| except NotImplementedError: |
| # if we got a NotImplementedError, it's because |
| # * follow_symlinks=False, |
| # * lchown() is unavailable, and |
| # * either |
| # * fchownat() is unavailable or |
| # * fchownat() doesn't implement AT_SYMLINK_NOFOLLOW. |
| # (it returned ENOSUP.) |
| # therefore we're out of options--we simply cannot chown the |
| # symlink. give up, suppress the error. |
| # (which is what shutil always did in this circumstance.) |
| pass |
| if hasattr(st, 'st_flags'): |
| try: |
| lookup("chflags")(dst, st.st_flags, follow_symlinks=follow) |
| except OSError as why: |
| for err in 'EOPNOTSUPP', 'ENOTSUP': |
| if hasattr(errno, err) and why.errno == getattr(errno, err): |
| break |
| else: |
| raise |
| |
| def copy(src, dst, *, follow_symlinks=True): |
| """Copy data and mode bits ("cp src dst"). Return the file's destination. |
| |
| The destination may be a directory. |
| |
| If follow_symlinks is false, symlinks won't be followed. This |
| resembles GNU's "cp -P src dst". |
| |
| If source and destination are the same file, a SameFileError will be |
| raised. |
| |
| """ |
| if os.path.isdir(dst): |
| dst = os.path.join(dst, os.path.basename(src)) |
| copyfile(src, dst, follow_symlinks=follow_symlinks) |
| copymode(src, dst, follow_symlinks=follow_symlinks) |
| return dst |
| |
| def copy2(src, dst, *, follow_symlinks=True): |
| """Copy data and metadata. Return the file's destination. |
| |
| Metadata is copied with copystat(). Please see the copystat function |
| for more information. |
| |
| The destination may be a directory. |
| |
| If follow_symlinks is false, symlinks won't be followed. This |
| resembles GNU's "cp -P src dst". |
| """ |
| if os.path.isdir(dst): |
| dst = os.path.join(dst, os.path.basename(src)) |
| copyfile(src, dst, follow_symlinks=follow_symlinks) |
| copystat(src, dst, follow_symlinks=follow_symlinks) |
| return dst |
| |
| def ignore_patterns(*patterns): |
| """Function that can be used as copytree() ignore parameter. |
| |
| Patterns is a sequence of glob-style patterns |
| that are used to exclude files""" |
| def _ignore_patterns(path, names): |
| ignored_names = [] |
| for pattern in patterns: |
| ignored_names.extend(fnmatch.filter(names, pattern)) |
| return set(ignored_names) |
| return _ignore_patterns |
| |
| def _copytree(entries, src, dst, symlinks, ignore, copy_function, |
| ignore_dangling_symlinks, dirs_exist_ok=False): |
| if ignore is not None: |
| ignored_names = ignore(os.fspath(src), [x.name for x in entries]) |
| else: |
| ignored_names = set() |
| |
| os.makedirs(dst, exist_ok=dirs_exist_ok) |
| errors = [] |
| use_srcentry = copy_function is copy2 or copy_function is copy |
| |
| for srcentry in entries: |
| if srcentry.name in ignored_names: |
| continue |
| srcname = os.path.join(src, srcentry.name) |
| dstname = os.path.join(dst, srcentry.name) |
| srcobj = srcentry if use_srcentry else srcname |
| try: |
| is_symlink = srcentry.is_symlink() |
| if is_symlink and os.name == 'nt': |
| # Special check for directory junctions, which appear as |
| # symlinks but we want to recurse. |
| lstat = srcentry.stat(follow_symlinks=False) |
| if lstat.st_reparse_tag == stat.IO_REPARSE_TAG_MOUNT_POINT: |
| is_symlink = False |
| if is_symlink: |
| linkto = os.readlink(srcname) |
| if symlinks: |
| # We can't just leave it to `copy_function` because legacy |
| # code with a custom `copy_function` may rely on copytree |
| # doing the right thing. |
| os.symlink(linkto, dstname) |
| copystat(srcobj, dstname, follow_symlinks=not symlinks) |
| else: |
| # ignore dangling symlink if the flag is on |
| if not os.path.exists(linkto) and ignore_dangling_symlinks: |
| continue |
| # otherwise let the copy occur. copy2 will raise an error |
| if srcentry.is_dir(): |
| copytree(srcobj, dstname, symlinks, ignore, |
| copy_function, dirs_exist_ok=dirs_exist_ok) |
| else: |
| copy_function(srcobj, dstname) |
| elif srcentry.is_dir(): |
| copytree(srcobj, dstname, symlinks, ignore, copy_function, |
| dirs_exist_ok=dirs_exist_ok) |
| else: |
| # Will raise a SpecialFileError for unsupported file types |
| copy_function(srcobj, dstname) |
| # catch the Error from the recursive copytree so that we can |
| # continue with other files |
| except Error as err: |
| errors.extend(err.args[0]) |
| except OSError as why: |
| errors.append((srcname, dstname, str(why))) |
| try: |
| copystat(src, dst) |
| except OSError as why: |
| # Copying file access times may fail on Windows |
| if getattr(why, 'winerror', None) is None: |
| errors.append((src, dst, str(why))) |
| if errors: |
| raise Error(errors) |
| return dst |
| |
| def copytree(src, dst, symlinks=False, ignore=None, copy_function=copy2, |
| ignore_dangling_symlinks=False, dirs_exist_ok=False): |
| """Recursively copy a directory tree and return the destination directory. |
| |
| dirs_exist_ok dictates whether to raise an exception in case dst or any |
| missing parent directory already exists. |
| |
| If exception(s) occur, an Error is raised with a list of reasons. |
| |
| If the optional symlinks flag is true, symbolic links in the |
| source tree result in symbolic links in the destination tree; if |
| it is false, the contents of the files pointed to by symbolic |
| links are copied. If the file pointed by the symlink doesn't |
| exist, an exception will be added in the list of errors raised in |
| an Error exception at the end of the copy process. |
| |
| You can set the optional ignore_dangling_symlinks flag to true if you |
| want to silence this exception. Notice that this has no effect on |
| platforms that don't support os.symlink. |
| |
| The optional ignore argument is a callable. If given, it |
| is called with the `src` parameter, which is the directory |
| being visited by copytree(), and `names` which is the list of |
| `src` contents, as returned by os.listdir(): |
| |
| callable(src, names) -> ignored_names |
| |
| Since copytree() is called recursively, the callable will be |
| called once for each directory that is copied. It returns a |
| list of names relative to the `src` directory that should |
| not be copied. |
| |
| The optional copy_function argument is a callable that will be used |
| to copy each file. It will be called with the source path and the |
| destination path as arguments. By default, copy2() is used, but any |
| function that supports the same signature (like copy()) can be used. |
| |
| """ |
| sys.audit("shutil.copytree", src, dst) |
| with os.scandir(src) as itr: |
| entries = list(itr) |
| return _copytree(entries=entries, src=src, dst=dst, symlinks=symlinks, |
| ignore=ignore, copy_function=copy_function, |
| ignore_dangling_symlinks=ignore_dangling_symlinks, |
| dirs_exist_ok=dirs_exist_ok) |
| |
| if hasattr(os.stat_result, 'st_file_attributes'): |
| # Special handling for directory junctions to make them behave like |
| # symlinks for shutil.rmtree, since in general they do not appear as |
| # regular links. |
| def _rmtree_isdir(entry): |
| try: |
| st = entry.stat(follow_symlinks=False) |
| return (stat.S_ISDIR(st.st_mode) and not |
| (st.st_file_attributes & stat.FILE_ATTRIBUTE_REPARSE_POINT |
| and st.st_reparse_tag == stat.IO_REPARSE_TAG_MOUNT_POINT)) |
| except OSError: |
| return False |
| |
| def _rmtree_islink(path): |
| try: |
| st = os.lstat(path) |
| return (stat.S_ISLNK(st.st_mode) or |
| (st.st_file_attributes & stat.FILE_ATTRIBUTE_REPARSE_POINT |
| and st.st_reparse_tag == stat.IO_REPARSE_TAG_MOUNT_POINT)) |
| except OSError: |
| return False |
| else: |
| def _rmtree_isdir(entry): |
| try: |
| return entry.is_dir(follow_symlinks=False) |
| except OSError: |
| return False |
| |
| def _rmtree_islink(path): |
| return os.path.islink(path) |
| |
| # version vulnerable to race conditions |
| def _rmtree_unsafe(path, onerror): |
| try: |
| with os.scandir(path) as scandir_it: |
| entries = list(scandir_it) |
| except OSError: |
| onerror(os.scandir, path, sys.exc_info()) |
| entries = [] |
| for entry in entries: |
| fullname = entry.path |
| if _rmtree_isdir(entry): |
| try: |
| if entry.is_symlink(): |
| # This can only happen if someone replaces |
| # a directory with a symlink after the call to |
| # os.scandir or entry.is_dir above. |
| raise OSError("Cannot call rmtree on a symbolic link") |
| except OSError: |
| onerror(os.path.islink, fullname, sys.exc_info()) |
| continue |
| _rmtree_unsafe(fullname, onerror) |
| else: |
| try: |
| os.unlink(fullname) |
| except OSError: |
| onerror(os.unlink, fullname, sys.exc_info()) |
| try: |
| os.rmdir(path) |
| except OSError: |
| onerror(os.rmdir, path, sys.exc_info()) |
| |
| # Version using fd-based APIs to protect against races |
| def _rmtree_safe_fd(topfd, path, onerror): |
| try: |
| with os.scandir(topfd) as scandir_it: |
| entries = list(scandir_it) |
| except OSError as err: |
| err.filename = path |
| onerror(os.scandir, path, sys.exc_info()) |
| return |
| for entry in entries: |
| fullname = os.path.join(path, entry.name) |
| try: |
| is_dir = entry.is_dir(follow_symlinks=False) |
| except OSError: |
| is_dir = False |
| else: |
| if is_dir: |
| try: |
| orig_st = entry.stat(follow_symlinks=False) |
| is_dir = stat.S_ISDIR(orig_st.st_mode) |
| except OSError: |
| onerror(os.lstat, fullname, sys.exc_info()) |
| continue |
| if is_dir: |
| try: |
| dirfd = os.open(entry.name, os.O_RDONLY, dir_fd=topfd) |
| except OSError: |
| onerror(os.open, fullname, sys.exc_info()) |
| else: |
| try: |
| if os.path.samestat(orig_st, os.fstat(dirfd)): |
| _rmtree_safe_fd(dirfd, fullname, onerror) |
| try: |
| os.rmdir(entry.name, dir_fd=topfd) |
| except OSError: |
| onerror(os.rmdir, fullname, sys.exc_info()) |
| else: |
| try: |
| # This can only happen if someone replaces |
| # a directory with a symlink after the call to |
| # os.scandir or stat.S_ISDIR above. |
| raise OSError("Cannot call rmtree on a symbolic " |
| "link") |
| except OSError: |
| onerror(os.path.islink, fullname, sys.exc_info()) |
| finally: |
| os.close(dirfd) |
| else: |
| try: |
| os.unlink(entry.name, dir_fd=topfd) |
| except OSError: |
| onerror(os.unlink, fullname, sys.exc_info()) |
| |
| _use_fd_functions = ({os.open, os.stat, os.unlink, os.rmdir} <= |
| os.supports_dir_fd and |
| os.scandir in os.supports_fd and |
| os.stat in os.supports_follow_symlinks) |
| |
| def rmtree(path, ignore_errors=False, onerror=None): |
| """Recursively delete a directory tree. |
| |
| If ignore_errors is set, errors are ignored; otherwise, if onerror |
| is set, it is called to handle the error with arguments (func, |
| path, exc_info) where func is platform and implementation dependent; |
| path is the argument to that function that caused it to fail; and |
| exc_info is a tuple returned by sys.exc_info(). If ignore_errors |
| is false and onerror is None, an exception is raised. |
| |
| """ |
| sys.audit("shutil.rmtree", path) |
| if ignore_errors: |
| def onerror(*args): |
| pass |
| elif onerror is None: |
| def onerror(*args): |
| raise |
| if _use_fd_functions: |
| # While the unsafe rmtree works fine on bytes, the fd based does not. |
| if isinstance(path, bytes): |
| path = os.fsdecode(path) |
| # Note: To guard against symlink races, we use the standard |
| # lstat()/open()/fstat() trick. |
| try: |
| orig_st = os.lstat(path) |
| except Exception: |
| onerror(os.lstat, path, sys.exc_info()) |
| return |
| try: |
| fd = os.open(path, os.O_RDONLY) |
| except Exception: |
| onerror(os.open, path, sys.exc_info()) |
| return |
| try: |
| if os.path.samestat(orig_st, os.fstat(fd)): |
| _rmtree_safe_fd(fd, path, onerror) |
| try: |
| os.rmdir(path) |
| except OSError: |
| onerror(os.rmdir, path, sys.exc_info()) |
| else: |
| try: |
| # symlinks to directories are forbidden, see bug #1669 |
| raise OSError("Cannot call rmtree on a symbolic link") |
| except OSError: |
| onerror(os.path.islink, path, sys.exc_info()) |
| finally: |
| os.close(fd) |
| else: |
| try: |
| if _rmtree_islink(path): |
| # symlinks to directories are forbidden, see bug #1669 |
| raise OSError("Cannot call rmtree on a symbolic link") |
| except OSError: |
| onerror(os.path.islink, path, sys.exc_info()) |
| # can't continue even if onerror hook returns |
| return |
| return _rmtree_unsafe(path, onerror) |
| |
| # Allow introspection of whether or not the hardening against symlink |
| # attacks is supported on the current platform |
| rmtree.avoids_symlink_attacks = _use_fd_functions |
| |
| def _basename(path): |
| """A basename() variant which first strips the trailing slash, if present. |
| Thus we always get the last component of the path, even for directories. |
| |
| path: Union[PathLike, str] |
| |
| e.g. |
| >>> os.path.basename('/bar/foo') |
| 'foo' |
| >>> os.path.basename('/bar/foo/') |
| '' |
| >>> _basename('/bar/foo/') |
| 'foo' |
| """ |
| path = os.fspath(path) |
| sep = os.path.sep + (os.path.altsep or '') |
| return os.path.basename(path.rstrip(sep)) |
| |
| def move(src, dst, copy_function=copy2): |
| """Recursively move a file or directory to another location. This is |
| similar to the Unix "mv" command. Return the file or directory's |
| destination. |
| |
| If the destination is a directory or a symlink to a directory, the source |
| is moved inside the directory. The destination path must not already |
| exist. |
| |
| If the destination already exists but is not a directory, it may be |
| overwritten depending on os.rename() semantics. |
| |
| If the destination is on our current filesystem, then rename() is used. |
| Otherwise, src is copied to the destination and then removed. Symlinks are |
| recreated under the new name if os.rename() fails because of cross |
| filesystem renames. |
| |
| The optional `copy_function` argument is a callable that will be used |
| to copy the source or it will be delegated to `copytree`. |
| By default, copy2() is used, but any function that supports the same |
| signature (like copy()) can be used. |
| |
| A lot more could be done here... A look at a mv.c shows a lot of |
| the issues this implementation glosses over. |
| |
| """ |
| sys.audit("shutil.move", src, dst) |
| real_dst = dst |
| if os.path.isdir(dst): |
| if _samefile(src, dst): |
| # We might be on a case insensitive filesystem, |
| # perform the rename anyway. |
| os.rename(src, dst) |
| return |
| |
| # Using _basename instead of os.path.basename is important, as we must |
| # ignore any trailing slash to avoid the basename returning '' |
| real_dst = os.path.join(dst, _basename(src)) |
| |
| if os.path.exists(real_dst): |
| raise Error("Destination path '%s' already exists" % real_dst) |
| try: |
| os.rename(src, real_dst) |
| except OSError: |
| if os.path.islink(src): |
| linkto = os.readlink(src) |
| os.symlink(linkto, real_dst) |
| os.unlink(src) |
| elif os.path.isdir(src): |
| if _destinsrc(src, dst): |
| raise Error("Cannot move a directory '%s' into itself" |
| " '%s'." % (src, dst)) |
| copytree(src, real_dst, copy_function=copy_function, |
| symlinks=True) |
| rmtree(src) |
| else: |
| copy_function(src, real_dst) |
| os.unlink(src) |
| return real_dst |
| |
| def _destinsrc(src, dst): |
| src = os.path.abspath(src) |
| dst = os.path.abspath(dst) |
| if not src.endswith(os.path.sep): |
| src += os.path.sep |
| if not dst.endswith(os.path.sep): |
| dst += os.path.sep |
| return dst.startswith(src) |
| |
| def _get_gid(name): |
| """Returns a gid, given a group name.""" |
| if getgrnam is None or name is None: |
| return None |
| try: |
| result = getgrnam(name) |
| except KeyError: |
| result = None |
| if result is not None: |
| return result[2] |
| return None |
| |
| def _get_uid(name): |
| """Returns an uid, given a user name.""" |
| if getpwnam is None or name is None: |
| return None |
| try: |
| result = getpwnam(name) |
| except KeyError: |
| result = None |
| if result is not None: |
| return result[2] |
| return None |
| |
| def _make_tarball(base_name, base_dir, compress="gzip", verbose=0, dry_run=0, |
| owner=None, group=None, logger=None): |
| """Create a (possibly compressed) tar file from all the files under |
| 'base_dir'. |
| |
| 'compress' must be "gzip" (the default), "bzip2", "xz", or None. |
| |
| 'owner' and 'group' can be used to define an owner and a group for the |
| archive that is being built. If not provided, the current owner and group |
| will be used. |
| |
| The output tar file will be named 'base_name' + ".tar", possibly plus |
| the appropriate compression extension (".gz", ".bz2", or ".xz"). |
| |
| Returns the output filename. |
| """ |
| if compress is None: |
| tar_compression = '' |
| elif _ZLIB_SUPPORTED and compress == 'gzip': |
| tar_compression = 'gz' |
| elif _BZ2_SUPPORTED and compress == 'bzip2': |
| tar_compression = 'bz2' |
| elif _LZMA_SUPPORTED and compress == 'xz': |
| tar_compression = 'xz' |
| else: |
| raise ValueError("bad value for 'compress', or compression format not " |
| "supported : {0}".format(compress)) |
| |
| import tarfile # late import for breaking circular dependency |
| |
| compress_ext = '.' + tar_compression if compress else '' |
| archive_name = base_name + '.tar' + compress_ext |
| archive_dir = os.path.dirname(archive_name) |
| |
| if archive_dir and not os.path.exists(archive_dir): |
| if logger is not None: |
| logger.info("creating %s", archive_dir) |
| if not dry_run: |
| os.makedirs(archive_dir) |
| |
| # creating the tarball |
| if logger is not None: |
| logger.info('Creating tar archive') |
| |
| uid = _get_uid(owner) |
| gid = _get_gid(group) |
| |
| def _set_uid_gid(tarinfo): |
| if gid is not None: |
| tarinfo.gid = gid |
| tarinfo.gname = group |
| if uid is not None: |
| tarinfo.uid = uid |
| tarinfo.uname = owner |
| return tarinfo |
| |
| if not dry_run: |
| tar = tarfile.open(archive_name, 'w|%s' % tar_compression) |
| try: |
| tar.add(base_dir, filter=_set_uid_gid) |
| finally: |
| tar.close() |
| |
| return archive_name |
| |
| def _make_zipfile(base_name, base_dir, verbose=0, dry_run=0, logger=None): |
| """Create a zip file from all the files under 'base_dir'. |
| |
| The output zip file will be named 'base_name' + ".zip". Returns the |
| name of the output zip file. |
| """ |
| import zipfile # late import for breaking circular dependency |
| |
| zip_filename = base_name + ".zip" |
| archive_dir = os.path.dirname(base_name) |
| |
| if archive_dir and not os.path.exists(archive_dir): |
| if logger is not None: |
| logger.info("creating %s", archive_dir) |
| if not dry_run: |
| os.makedirs(archive_dir) |
| |
| if logger is not None: |
| logger.info("creating '%s' and adding '%s' to it", |
| zip_filename, base_dir) |
| |
| if not dry_run: |
| with zipfile.ZipFile(zip_filename, "w", |
| compression=zipfile.ZIP_DEFLATED) as zf: |
| path = os.path.normpath(base_dir) |
| if path != os.curdir: |
| zf.write(path, path) |
| if logger is not None: |
| logger.info("adding '%s'", path) |
| for dirpath, dirnames, filenames in os.walk(base_dir): |
| for name in sorted(dirnames): |
| path = os.path.normpath(os.path.join(dirpath, name)) |
| zf.write(path, path) |
| if logger is not None: |
| logger.info("adding '%s'", path) |
| for name in filenames: |
| path = os.path.normpath(os.path.join(dirpath, name)) |
| if os.path.isfile(path): |
| zf.write(path, path) |
| if logger is not None: |
| logger.info("adding '%s'", path) |
| |
| return zip_filename |
| |
| _ARCHIVE_FORMATS = { |
| 'tar': (_make_tarball, [('compress', None)], "uncompressed tar file"), |
| } |
| |
| if _ZLIB_SUPPORTED: |
| _ARCHIVE_FORMATS['gztar'] = (_make_tarball, [('compress', 'gzip')], |
| "gzip'ed tar-file") |
| _ARCHIVE_FORMATS['zip'] = (_make_zipfile, [], "ZIP file") |
| |
| if _BZ2_SUPPORTED: |
| _ARCHIVE_FORMATS['bztar'] = (_make_tarball, [('compress', 'bzip2')], |
| "bzip2'ed tar-file") |
| |
| if _LZMA_SUPPORTED: |
| _ARCHIVE_FORMATS['xztar'] = (_make_tarball, [('compress', 'xz')], |
| "xz'ed tar-file") |
| |
| def get_archive_formats(): |
| """Returns a list of supported formats for archiving and unarchiving. |
| |
| Each element of the returned sequence is a tuple (name, description) |
| """ |
| formats = [(name, registry[2]) for name, registry in |
| _ARCHIVE_FORMATS.items()] |
| formats.sort() |
| return formats |
| |
| def register_archive_format(name, function, extra_args=None, description=''): |
| """Registers an archive format. |
| |
| name is the name of the format. function is the callable that will be |
| used to create archives. If provided, extra_args is a sequence of |
| (name, value) tuples that will be passed as arguments to the callable. |
| description can be provided to describe the format, and will be returned |
| by the get_archive_formats() function. |
| """ |
| if extra_args is None: |
| extra_args = [] |
| if not callable(function): |
| raise TypeError('The %s object is not callable' % function) |
| if not isinstance(extra_args, (tuple, list)): |
| raise TypeError('extra_args needs to be a sequence') |
| for element in extra_args: |
| if not isinstance(element, (tuple, list)) or len(element) !=2: |
| raise TypeError('extra_args elements are : (arg_name, value)') |
| |
| _ARCHIVE_FORMATS[name] = (function, extra_args, description) |
| |
| def unregister_archive_format(name): |
| del _ARCHIVE_FORMATS[name] |
| |
| def make_archive(base_name, format, root_dir=None, base_dir=None, verbose=0, |
| dry_run=0, owner=None, group=None, logger=None): |
| """Create an archive file (eg. zip or tar). |
| |
| 'base_name' is the name of the file to create, minus any format-specific |
| extension; 'format' is the archive format: one of "zip", "tar", "gztar", |
| "bztar", or "xztar". Or any other registered format. |
| |
| 'root_dir' is a directory that will be the root directory of the |
| archive; ie. we typically chdir into 'root_dir' before creating the |
| archive. 'base_dir' is the directory where we start archiving from; |
| ie. 'base_dir' will be the common prefix of all files and |
| directories in the archive. 'root_dir' and 'base_dir' both default |
| to the current directory. Returns the name of the archive file. |
| |
| 'owner' and 'group' are used when creating a tar archive. By default, |
| uses the current owner and group. |
| """ |
| sys.audit("shutil.make_archive", base_name, format, root_dir, base_dir) |
| save_cwd = os.getcwd() |
| if root_dir is not None: |
| if logger is not None: |
| logger.debug("changing into '%s'", root_dir) |
| base_name = os.path.abspath(base_name) |
| if not dry_run: |
| os.chdir(root_dir) |
| |
| if base_dir is None: |
| base_dir = os.curdir |
| |
| kwargs = {'dry_run': dry_run, 'logger': logger} |
| |
| try: |
| format_info = _ARCHIVE_FORMATS[format] |
| except KeyError: |
| raise ValueError("unknown archive format '%s'" % format) from None |
| |
| func = format_info[0] |
| for arg, val in format_info[1]: |
| kwargs[arg] = val |
| |
| if format != 'zip': |
| kwargs['owner'] = owner |
| kwargs['group'] = group |
| |
| try: |
| filename = func(base_name, base_dir, **kwargs) |
| finally: |
| if root_dir is not None: |
| if logger is not None: |
| logger.debug("changing back to '%s'", save_cwd) |
| os.chdir(save_cwd) |
| |
| return filename |
| |
| |
| def get_unpack_formats(): |
| """Returns a list of supported formats for unpacking. |
| |
| Each element of the returned sequence is a tuple |
| (name, extensions, description) |
| """ |
| formats = [(name, info[0], info[3]) for name, info in |
| _UNPACK_FORMATS.items()] |
| formats.sort() |
| return formats |
| |
| def _check_unpack_options(extensions, function, extra_args): |
| """Checks what gets registered as an unpacker.""" |
| # first make sure no other unpacker is registered for this extension |
| existing_extensions = {} |
| for name, info in _UNPACK_FORMATS.items(): |
| for ext in info[0]: |
| existing_extensions[ext] = name |
| |
| for extension in extensions: |
| if extension in existing_extensions: |
| msg = '%s is already registered for "%s"' |
| raise RegistryError(msg % (extension, |
| existing_extensions[extension])) |
| |
| if not callable(function): |
| raise TypeError('The registered function must be a callable') |
| |
| |
| def register_unpack_format(name, extensions, function, extra_args=None, |
| description=''): |
| """Registers an unpack format. |
| |
| `name` is the name of the format. `extensions` is a list of extensions |
| corresponding to the format. |
| |
| `function` is the callable that will be |
| used to unpack archives. The callable will receive archives to unpack. |
| If it's unable to handle an archive, it needs to raise a ReadError |
| exception. |
| |
| If provided, `extra_args` is a sequence of |
| (name, value) tuples that will be passed as arguments to the callable. |
| description can be provided to describe the format, and will be returned |
| by the get_unpack_formats() function. |
| """ |
| if extra_args is None: |
| extra_args = [] |
| _check_unpack_options(extensions, function, extra_args) |
| _UNPACK_FORMATS[name] = extensions, function, extra_args, description |
| |
| def unregister_unpack_format(name): |
| """Removes the pack format from the registry.""" |
| del _UNPACK_FORMATS[name] |
| |
| def _ensure_directory(path): |
| """Ensure that the parent directory of `path` exists""" |
| dirname = os.path.dirname(path) |
| if not os.path.isdir(dirname): |
| os.makedirs(dirname) |
| |
| def _unpack_zipfile(filename, extract_dir): |
| """Unpack zip `filename` to `extract_dir` |
| """ |
| import zipfile # late import for breaking circular dependency |
| |
| if not zipfile.is_zipfile(filename): |
| raise ReadError("%s is not a zip file" % filename) |
| |
| zip = zipfile.ZipFile(filename) |
| try: |
| for info in zip.infolist(): |
| name = info.filename |
| |
| # don't extract absolute paths or ones with .. in them |
| if name.startswith('/') or '..' in name: |
| continue |
| |
| target = os.path.join(extract_dir, *name.split('/')) |
| if not target: |
| continue |
| |
| _ensure_directory(target) |
| if not name.endswith('/'): |
| # file |
| data = zip.read(info.filename) |
| f = open(target, 'wb') |
| try: |
| f.write(data) |
| finally: |
| f.close() |
| del data |
| finally: |
| zip.close() |
| |
| def _unpack_tarfile(filename, extract_dir): |
| """Unpack tar/tar.gz/tar.bz2/tar.xz `filename` to `extract_dir` |
| """ |
| import tarfile # late import for breaking circular dependency |
| try: |
| tarobj = tarfile.open(filename) |
| except tarfile.TarError: |
| raise ReadError( |
| "%s is not a compressed or uncompressed tar file" % filename) |
| try: |
| tarobj.extractall(extract_dir) |
| finally: |
| tarobj.close() |
| |
| _UNPACK_FORMATS = { |
| 'tar': (['.tar'], _unpack_tarfile, [], "uncompressed tar file"), |
| 'zip': (['.zip'], _unpack_zipfile, [], "ZIP file"), |
| } |
| |
| if _ZLIB_SUPPORTED: |
| _UNPACK_FORMATS['gztar'] = (['.tar.gz', '.tgz'], _unpack_tarfile, [], |
| "gzip'ed tar-file") |
| |
| if _BZ2_SUPPORTED: |
| _UNPACK_FORMATS['bztar'] = (['.tar.bz2', '.tbz2'], _unpack_tarfile, [], |
| "bzip2'ed tar-file") |
| |
| if _LZMA_SUPPORTED: |
| _UNPACK_FORMATS['xztar'] = (['.tar.xz', '.txz'], _unpack_tarfile, [], |
| "xz'ed tar-file") |
| |
| def _find_unpack_format(filename): |
| for name, info in _UNPACK_FORMATS.items(): |
| for extension in info[0]: |
| if filename.endswith(extension): |
| return name |
| return None |
| |
| def unpack_archive(filename, extract_dir=None, format=None): |
| """Unpack an archive. |
| |
| `filename` is the name of the archive. |
| |
| `extract_dir` is the name of the target directory, where the archive |
| is unpacked. If not provided, the current working directory is used. |
| |
| `format` is the archive format: one of "zip", "tar", "gztar", "bztar", |
| or "xztar". Or any other registered format. If not provided, |
| unpack_archive will use the filename extension and see if an unpacker |
| was registered for that extension. |
| |
| In case none is found, a ValueError is raised. |
| """ |
| sys.audit("shutil.unpack_archive", filename, extract_dir, format) |
| |
| if extract_dir is None: |
| extract_dir = os.getcwd() |
| |
| extract_dir = os.fspath(extract_dir) |
| filename = os.fspath(filename) |
| |
| if format is not None: |
| try: |
| format_info = _UNPACK_FORMATS[format] |
| except KeyError: |
| raise ValueError("Unknown unpack format '{0}'".format(format)) from None |
| |
| func = format_info[1] |
| func(filename, extract_dir, **dict(format_info[2])) |
| else: |
| # we need to look at the registered unpackers supported extensions |
| format = _find_unpack_format(filename) |
| if format is None: |
| raise ReadError("Unknown archive format '{0}'".format(filename)) |
| |
| func = _UNPACK_FORMATS[format][1] |
| kwargs = dict(_UNPACK_FORMATS[format][2]) |
| func(filename, extract_dir, **kwargs) |
| |
| |
| if hasattr(os, 'statvfs'): |
| |
| __all__.append('disk_usage') |
| _ntuple_diskusage = collections.namedtuple('usage', 'total used free') |
| _ntuple_diskusage.total.__doc__ = 'Total space in bytes' |
| _ntuple_diskusage.used.__doc__ = 'Used space in bytes' |
| _ntuple_diskusage.free.__doc__ = 'Free space in bytes' |
| |
| def disk_usage(path): |
| """Return disk usage statistics about the given path. |
| |
| Returned value is a named tuple with attributes 'total', 'used' and |
| 'free', which are the amount of total, used and free space, in bytes. |
| """ |
| st = os.statvfs(path) |
| free = st.f_bavail * st.f_frsize |
| total = st.f_blocks * st.f_frsize |
| used = (st.f_blocks - st.f_bfree) * st.f_frsize |
| return _ntuple_diskusage(total, used, free) |
| |
| elif _WINDOWS: |
| |
| __all__.append('disk_usage') |
| _ntuple_diskusage = collections.namedtuple('usage', 'total used free') |
| |
| def disk_usage(path): |
| """Return disk usage statistics about the given path. |
| |
| Returned values is a named tuple with attributes 'total', 'used' and |
| 'free', which are the amount of total, used and free space, in bytes. |
| """ |
| total, free = nt._getdiskusage(path) |
| used = total - free |
| return _ntuple_diskusage(total, used, free) |
| |
| |
| def chown(path, user=None, group=None): |
| """Change owner user and group of the given path. |
| |
| user and group can be the uid/gid or the user/group names, and in that case, |
| they are converted to their respective uid/gid. |
| """ |
| sys.audit('shutil.chown', path, user, group) |
| |
| if user is None and group is None: |
| raise ValueError("user and/or group must be set") |
| |
| _user = user |
| _group = group |
| |
| # -1 means don't change it |
| if user is None: |
| _user = -1 |
| # user can either be an int (the uid) or a string (the system username) |
| elif isinstance(user, str): |
| _user = _get_uid(user) |
| if _user is None: |
| raise LookupError("no such user: {!r}".format(user)) |
| |
| if group is None: |
| _group = -1 |
| elif not isinstance(group, int): |
| _group = _get_gid(group) |
| if _group is None: |
| raise LookupError("no such group: {!r}".format(group)) |
| |
| os.chown(path, _user, _group) |
| |
| def get_terminal_size(fallback=(80, 24)): |
| """Get the size of the terminal window. |
| |
| For each of the two dimensions, the environment variable, COLUMNS |
| and LINES respectively, is checked. If the variable is defined and |
| the value is a positive integer, it is used. |
| |
| When COLUMNS or LINES is not defined, which is the common case, |
| the terminal connected to sys.__stdout__ is queried |
| by invoking os.get_terminal_size. |
| |
| If the terminal size cannot be successfully queried, either because |
| the system doesn't support querying, or because we are not |
| connected to a terminal, the value given in fallback parameter |
| is used. Fallback defaults to (80, 24) which is the default |
| size used by many terminal emulators. |
| |
| The value returned is a named tuple of type os.terminal_size. |
| """ |
| # columns, lines are the working values |
| try: |
| columns = int(os.environ['COLUMNS']) |
| except (KeyError, ValueError): |
| columns = 0 |
| |
| try: |
| lines = int(os.environ['LINES']) |
| except (KeyError, ValueError): |
| lines = 0 |
| |
| # only query if necessary |
| if columns <= 0 or lines <= 0: |
| try: |
| size = os.get_terminal_size(sys.__stdout__.fileno()) |
| except (AttributeError, ValueError, OSError): |
| # stdout is None, closed, detached, or not a terminal, or |
| # os.get_terminal_size() is unsupported |
| size = os.terminal_size(fallback) |
| if columns <= 0: |
| columns = size.columns |
| if lines <= 0: |
| lines = size.lines |
| |
| return os.terminal_size((columns, lines)) |
| |
| |
| # Check that a given file can be accessed with the correct mode. |
| # Additionally check that `file` is not a directory, as on Windows |
| # directories pass the os.access check. |
| def _access_check(fn, mode): |
| return (os.path.exists(fn) and os.access(fn, mode) |
| and not os.path.isdir(fn)) |
| |
| |
| def which(cmd, mode=os.F_OK | os.X_OK, path=None): |
| """Given a command, mode, and a PATH string, return the path which |
| conforms to the given mode on the PATH, or None if there is no such |
| file. |
| |
| `mode` defaults to os.F_OK | os.X_OK. `path` defaults to the result |
| of os.environ.get("PATH"), or can be overridden with a custom search |
| path. |
| |
| """ |
| # If we're given a path with a directory part, look it up directly rather |
| # than referring to PATH directories. This includes checking relative to the |
| # current directory, e.g. ./script |
| if os.path.dirname(cmd): |
| if _access_check(cmd, mode): |
| return cmd |
| return None |
| |
| use_bytes = isinstance(cmd, bytes) |
| |
| if path is None: |
| path = os.environ.get("PATH", None) |
| if path is None: |
| try: |
| path = os.confstr("CS_PATH") |
| except (AttributeError, ValueError): |
| # os.confstr() or CS_PATH is not available |
| path = os.defpath |
| # bpo-35755: Don't use os.defpath if the PATH environment variable is |
| # set to an empty string |
| |
| # PATH='' doesn't match, whereas PATH=':' looks in the current directory |
| if not path: |
| return None |
| |
| if use_bytes: |
| path = os.fsencode(path) |
| path = path.split(os.fsencode(os.pathsep)) |
| else: |
| path = os.fsdecode(path) |
| path = path.split(os.pathsep) |
| |
| if sys.platform == "win32": |
| # The current directory takes precedence on Windows. |
| curdir = os.curdir |
| if use_bytes: |
| curdir = os.fsencode(curdir) |
| if curdir not in path: |
| path.insert(0, curdir) |
| |
| # PATHEXT is necessary to check on Windows. |
| pathext_source = os.getenv("PATHEXT") or _WIN_DEFAULT_PATHEXT |
| pathext = [ext for ext in pathext_source.split(os.pathsep) if ext] |
| |
| if use_bytes: |
| pathext = [os.fsencode(ext) for ext in pathext] |
| # See if the given file matches any of the expected path extensions. |
| # This will allow us to short circuit when given "python.exe". |
| # If it does match, only test that one, otherwise we have to try |
| # others. |
| if any(cmd.lower().endswith(ext.lower()) for ext in pathext): |
| files = [cmd] |
| else: |
| files = [cmd + ext for ext in pathext] |
| else: |
| # On other platforms you don't have things like PATHEXT to tell you |
| # what file suffixes are executable, so just pass on cmd as-is. |
| files = [cmd] |
| |
| seen = set() |
| for dir in path: |
| normdir = os.path.normcase(dir) |
| if not normdir in seen: |
| seen.add(normdir) |
| for thefile in files: |
| name = os.path.join(dir, thefile) |
| if _access_check(name, mode): |
| return name |
| return None |
