mirror of
https://github.com/python/cpython.git
synced 2024-12-24 09:15:04 +08:00
0a08d7a095
and the source is a symlink, shutil.move() now recreates a symlink on the destination instead of copying the file contents. Patch by Jonathan Niehof and Hynek Schlawack.
882 lines
29 KiB
Python
882 lines
29 KiB
Python
"""Utility functions for copying and archiving files and directory trees.
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XXX The functions here don't copy the resource fork or other metadata on Mac.
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"""
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import os
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import sys
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import stat
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from os.path import abspath
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import fnmatch
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import collections
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import errno
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import tarfile
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try:
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import bz2
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del bz2
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_BZ2_SUPPORTED = True
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except ImportError:
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_BZ2_SUPPORTED = False
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try:
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from pwd import getpwnam
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except ImportError:
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getpwnam = None
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try:
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from grp import getgrnam
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except ImportError:
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getgrnam = None
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__all__ = ["copyfileobj", "copyfile", "copymode", "copystat", "copy", "copy2",
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"copytree", "move", "rmtree", "Error", "SpecialFileError",
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"ExecError", "make_archive", "get_archive_formats",
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"register_archive_format", "unregister_archive_format",
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"get_unpack_formats", "register_unpack_format",
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"unregister_unpack_format", "unpack_archive",
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"ignore_patterns", "chown"]
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# disk_usage is added later, if available on the platform
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class Error(EnvironmentError):
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pass
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class SpecialFileError(EnvironmentError):
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"""Raised when trying to do a kind of operation (e.g. copying) which is
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not supported on a special file (e.g. a named pipe)"""
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class ExecError(EnvironmentError):
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"""Raised when a command could not be executed"""
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class ReadError(EnvironmentError):
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"""Raised when an archive cannot be read"""
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class RegistryError(Exception):
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"""Raised when a registery operation with the archiving
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and unpacking registeries fails"""
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try:
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WindowsError
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except NameError:
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WindowsError = None
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def copyfileobj(fsrc, fdst, length=16*1024):
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"""copy data from file-like object fsrc to file-like object fdst"""
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while 1:
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buf = fsrc.read(length)
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if not buf:
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break
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fdst.write(buf)
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def _samefile(src, dst):
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# Macintosh, Unix.
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if hasattr(os.path, 'samefile'):
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try:
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return os.path.samefile(src, dst)
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except OSError:
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return False
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# All other platforms: check for same pathname.
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return (os.path.normcase(os.path.abspath(src)) ==
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os.path.normcase(os.path.abspath(dst)))
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def copyfile(src, dst, symlinks=False):
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"""Copy data from src to dst.
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If optional flag `symlinks` is set and `src` is a symbolic link, a new
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symlink will be created instead of copying the file it points to.
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"""
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if _samefile(src, dst):
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raise Error("`%s` and `%s` are the same file" % (src, dst))
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for fn in [src, dst]:
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try:
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st = os.stat(fn)
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except OSError:
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# File most likely does not exist
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pass
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else:
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# XXX What about other special files? (sockets, devices...)
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if stat.S_ISFIFO(st.st_mode):
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raise SpecialFileError("`%s` is a named pipe" % fn)
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if symlinks and os.path.islink(src):
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os.symlink(os.readlink(src), dst)
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else:
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with open(src, 'rb') as fsrc:
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with open(dst, 'wb') as fdst:
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copyfileobj(fsrc, fdst)
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def copymode(src, dst, symlinks=False):
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"""Copy mode bits from src to dst.
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If the optional flag `symlinks` is set, symlinks aren't followed if and
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only if both `src` and `dst` are symlinks. If `lchmod` isn't available (eg.
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Linux), in these cases, this method does nothing.
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"""
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if symlinks and os.path.islink(src) and os.path.islink(dst):
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if hasattr(os, 'lchmod'):
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stat_func, chmod_func = os.lstat, os.lchmod
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else:
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return
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elif hasattr(os, 'chmod'):
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stat_func, chmod_func = os.stat, os.chmod
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else:
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return
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st = stat_func(src)
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chmod_func(dst, stat.S_IMODE(st.st_mode))
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def copystat(src, dst, symlinks=False):
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"""Copy all stat info (mode bits, atime, mtime, flags) from src to dst.
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If the optional flag `symlinks` is set, symlinks aren't followed if and
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only if both `src` and `dst` are symlinks.
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"""
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def _nop(*args):
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pass
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if symlinks and os.path.islink(src) and os.path.islink(dst):
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stat_func = os.lstat
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utime_func = os.lutimes if hasattr(os, 'lutimes') else _nop
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chmod_func = os.lchmod if hasattr(os, 'lchmod') else _nop
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chflags_func = os.lchflags if hasattr(os, 'lchflags') else _nop
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else:
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stat_func = os.stat
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utime_func = os.utime if hasattr(os, 'utime') else _nop
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chmod_func = os.chmod if hasattr(os, 'chmod') else _nop
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chflags_func = os.chflags if hasattr(os, 'chflags') else _nop
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st = stat_func(src)
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mode = stat.S_IMODE(st.st_mode)
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utime_func(dst, (st.st_atime, st.st_mtime))
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chmod_func(dst, mode)
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if hasattr(st, 'st_flags'):
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try:
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chflags_func(dst, st.st_flags)
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except OSError as why:
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if (not hasattr(errno, 'EOPNOTSUPP') or
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why.errno != errno.EOPNOTSUPP):
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raise
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def copy(src, dst, symlinks=False):
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"""Copy data and mode bits ("cp src dst").
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The destination may be a directory.
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If the optional flag `symlinks` is set, symlinks won't be followed. This
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resembles GNU's "cp -P src dst".
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"""
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if os.path.isdir(dst):
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dst = os.path.join(dst, os.path.basename(src))
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copyfile(src, dst, symlinks=symlinks)
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copymode(src, dst, symlinks=symlinks)
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def copy2(src, dst, symlinks=False):
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"""Copy data and all stat info ("cp -p src dst").
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The destination may be a directory.
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If the optional flag `symlinks` is set, symlinks won't be followed. This
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resembles GNU's "cp -P src dst".
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"""
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if os.path.isdir(dst):
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dst = os.path.join(dst, os.path.basename(src))
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copyfile(src, dst, symlinks=symlinks)
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copystat(src, dst, symlinks=symlinks)
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def ignore_patterns(*patterns):
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"""Function that can be used as copytree() ignore parameter.
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Patterns is a sequence of glob-style patterns
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that are used to exclude files"""
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def _ignore_patterns(path, names):
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ignored_names = []
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for pattern in patterns:
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ignored_names.extend(fnmatch.filter(names, pattern))
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return set(ignored_names)
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return _ignore_patterns
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def copytree(src, dst, symlinks=False, ignore=None, copy_function=copy2,
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ignore_dangling_symlinks=False):
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"""Recursively copy a directory tree.
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The destination directory must not already exist.
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If exception(s) occur, an Error is raised with a list of reasons.
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If the optional symlinks flag is true, symbolic links in the
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source tree result in symbolic links in the destination tree; if
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it is false, the contents of the files pointed to by symbolic
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links are copied. If the file pointed by the symlink doesn't
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exist, an exception will be added in the list of errors raised in
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an Error exception at the end of the copy process.
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You can set the optional ignore_dangling_symlinks flag to true if you
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want to silence this exception. Notice that this has no effect on
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platforms that don't support os.symlink.
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The optional ignore argument is a callable. If given, it
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is called with the `src` parameter, which is the directory
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being visited by copytree(), and `names` which is the list of
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`src` contents, as returned by os.listdir():
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callable(src, names) -> ignored_names
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Since copytree() is called recursively, the callable will be
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called once for each directory that is copied. It returns a
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list of names relative to the `src` directory that should
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not be copied.
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The optional copy_function argument is a callable that will be used
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to copy each file. It will be called with the source path and the
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destination path as arguments. By default, copy2() is used, but any
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function that supports the same signature (like copy()) can be used.
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"""
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names = os.listdir(src)
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if ignore is not None:
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ignored_names = ignore(src, names)
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else:
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ignored_names = set()
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os.makedirs(dst)
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errors = []
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for name in names:
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if name in ignored_names:
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continue
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srcname = os.path.join(src, name)
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dstname = os.path.join(dst, name)
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try:
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if os.path.islink(srcname):
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linkto = os.readlink(srcname)
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if symlinks:
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# We can't just leave it to `copy_function` because legacy
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# code with a custom `copy_function` may rely on copytree
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# doing the right thing.
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os.symlink(linkto, dstname)
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copystat(srcname, dstname, symlinks=symlinks)
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else:
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# ignore dangling symlink if the flag is on
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if not os.path.exists(linkto) and ignore_dangling_symlinks:
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continue
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# otherwise let the copy occurs. copy2 will raise an error
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copy_function(srcname, dstname)
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elif os.path.isdir(srcname):
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copytree(srcname, dstname, symlinks, ignore, copy_function)
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else:
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# Will raise a SpecialFileError for unsupported file types
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copy_function(srcname, dstname)
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# catch the Error from the recursive copytree so that we can
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# continue with other files
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except Error as err:
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errors.extend(err.args[0])
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except EnvironmentError as why:
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errors.append((srcname, dstname, str(why)))
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try:
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copystat(src, dst)
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except OSError as why:
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if WindowsError is not None and isinstance(why, WindowsError):
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# Copying file access times may fail on Windows
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pass
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else:
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errors.extend((src, dst, str(why)))
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if errors:
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raise Error(errors)
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def rmtree(path, ignore_errors=False, onerror=None):
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"""Recursively delete a directory tree.
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If ignore_errors is set, errors are ignored; otherwise, if onerror
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is set, it is called to handle the error with arguments (func,
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path, exc_info) where func is os.listdir, os.remove, or os.rmdir;
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path is the argument to that function that caused it to fail; and
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exc_info is a tuple returned by sys.exc_info(). If ignore_errors
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is false and onerror is None, an exception is raised.
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"""
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if ignore_errors:
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def onerror(*args):
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pass
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elif onerror is None:
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def onerror(*args):
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raise
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try:
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if os.path.islink(path):
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# symlinks to directories are forbidden, see bug #1669
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raise OSError("Cannot call rmtree on a symbolic link")
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except OSError:
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onerror(os.path.islink, path, sys.exc_info())
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# can't continue even if onerror hook returns
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return
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names = []
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try:
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names = os.listdir(path)
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except os.error:
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onerror(os.listdir, path, sys.exc_info())
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for name in names:
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fullname = os.path.join(path, name)
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try:
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mode = os.lstat(fullname).st_mode
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except os.error:
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mode = 0
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if stat.S_ISDIR(mode):
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rmtree(fullname, ignore_errors, onerror)
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else:
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try:
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os.remove(fullname)
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except os.error:
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onerror(os.remove, fullname, sys.exc_info())
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try:
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os.rmdir(path)
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except os.error:
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onerror(os.rmdir, path, sys.exc_info())
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def _basename(path):
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# A basename() variant which first strips the trailing slash, if present.
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# Thus we always get the last component of the path, even for directories.
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return os.path.basename(path.rstrip(os.path.sep))
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def move(src, dst):
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"""Recursively move a file or directory to another location. This is
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similar to the Unix "mv" command.
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If the destination is a directory or a symlink to a directory, the source
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is moved inside the directory. The destination path must not already
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exist.
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If the destination already exists but is not a directory, it may be
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overwritten depending on os.rename() semantics.
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If the destination is on our current filesystem, then rename() is used.
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Otherwise, src is copied to the destination and then removed. Symlinks are
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recreated under the new name if os.rename() fails because of cross
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filesystem renames.
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A lot more could be done here... A look at a mv.c shows a lot of
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the issues this implementation glosses over.
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"""
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real_dst = dst
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if os.path.isdir(dst):
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if _samefile(src, dst):
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# We might be on a case insensitive filesystem,
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# perform the rename anyway.
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os.rename(src, dst)
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return
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real_dst = os.path.join(dst, _basename(src))
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if os.path.exists(real_dst):
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raise Error("Destination path '%s' already exists" % real_dst)
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try:
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os.rename(src, real_dst)
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except OSError:
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if os.path.islink(src):
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linkto = os.readlink(src)
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os.symlink(linkto, real_dst)
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os.unlink(src)
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elif os.path.isdir(src):
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if _destinsrc(src, dst):
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raise Error("Cannot move a directory '%s' into itself '%s'." % (src, dst))
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copytree(src, real_dst, symlinks=True)
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rmtree(src)
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else:
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copy2(src, real_dst)
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os.unlink(src)
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def _destinsrc(src, dst):
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src = abspath(src)
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dst = abspath(dst)
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if not src.endswith(os.path.sep):
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src += os.path.sep
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if not dst.endswith(os.path.sep):
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dst += os.path.sep
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return dst.startswith(src)
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def _get_gid(name):
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"""Returns a gid, given a group name."""
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if getgrnam is None or name is None:
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return None
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try:
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result = getgrnam(name)
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except KeyError:
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result = None
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if result is not None:
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return result[2]
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return None
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def _get_uid(name):
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"""Returns an uid, given a user name."""
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if getpwnam is None or name is None:
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return None
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try:
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result = getpwnam(name)
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except KeyError:
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result = None
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if result is not None:
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return result[2]
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return None
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def _make_tarball(base_name, base_dir, compress="gzip", verbose=0, dry_run=0,
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owner=None, group=None, logger=None):
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"""Create a (possibly compressed) tar file from all the files under
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'base_dir'.
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'compress' must be "gzip" (the default), "bzip2", or None.
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'owner' and 'group' can be used to define an owner and a group for the
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archive that is being built. If not provided, the current owner and group
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will be used.
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The output tar file will be named 'base_name' + ".tar", possibly plus
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the appropriate compression extension (".gz", or ".bz2").
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Returns the output filename.
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"""
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tar_compression = {'gzip': 'gz', None: ''}
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compress_ext = {'gzip': '.gz'}
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if _BZ2_SUPPORTED:
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tar_compression['bzip2'] = 'bz2'
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compress_ext['bzip2'] = '.bz2'
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# flags for compression program, each element of list will be an argument
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if compress is not None and compress not in compress_ext:
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raise ValueError("bad value for 'compress', or compression format not "
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"supported : {0}".format(compress))
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archive_name = base_name + '.tar' + compress_ext.get(compress, '')
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archive_dir = os.path.dirname(archive_name)
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if not os.path.exists(archive_dir):
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if logger is not None:
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logger.info("creating %s", archive_dir)
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if not dry_run:
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os.makedirs(archive_dir)
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# creating the tarball
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if logger is not None:
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logger.info('Creating tar archive')
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uid = _get_uid(owner)
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gid = _get_gid(group)
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def _set_uid_gid(tarinfo):
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if gid is not None:
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tarinfo.gid = gid
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tarinfo.gname = group
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if uid is not None:
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tarinfo.uid = uid
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tarinfo.uname = owner
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return tarinfo
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if not dry_run:
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tar = tarfile.open(archive_name, 'w|%s' % tar_compression[compress])
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try:
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tar.add(base_dir, filter=_set_uid_gid)
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finally:
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tar.close()
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return archive_name
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def _call_external_zip(base_dir, zip_filename, verbose=False, dry_run=False):
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# XXX see if we want to keep an external call here
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if verbose:
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zipoptions = "-r"
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else:
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zipoptions = "-rq"
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from distutils.errors import DistutilsExecError
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from distutils.spawn import spawn
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try:
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spawn(["zip", zipoptions, zip_filename, base_dir], dry_run=dry_run)
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except DistutilsExecError:
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# XXX really should distinguish between "couldn't find
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# external 'zip' command" and "zip failed".
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raise ExecError("unable to create zip file '%s': "
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"could neither import the 'zipfile' module nor "
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"find a standalone zip utility") % zip_filename
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|
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". Uses either the
|
|
"zipfile" Python module (if available) or the InfoZIP "zip" utility
|
|
(if installed and found on the default search path). If neither tool is
|
|
available, raises ExecError. Returns the name of the output zip
|
|
file.
|
|
"""
|
|
zip_filename = base_name + ".zip"
|
|
archive_dir = os.path.dirname(base_name)
|
|
|
|
if 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 zipfile module is not available, try spawning an external 'zip'
|
|
# command.
|
|
try:
|
|
import zipfile
|
|
except ImportError:
|
|
zipfile = None
|
|
|
|
if zipfile is None:
|
|
_call_external_zip(base_dir, zip_filename, verbose, dry_run)
|
|
else:
|
|
if logger is not None:
|
|
logger.info("creating '%s' and adding '%s' to it",
|
|
zip_filename, base_dir)
|
|
|
|
if not dry_run:
|
|
zip = zipfile.ZipFile(zip_filename, "w",
|
|
compression=zipfile.ZIP_DEFLATED)
|
|
|
|
for dirpath, dirnames, filenames in os.walk(base_dir):
|
|
for name in filenames:
|
|
path = os.path.normpath(os.path.join(dirpath, name))
|
|
if os.path.isfile(path):
|
|
zip.write(path, path)
|
|
if logger is not None:
|
|
logger.info("adding '%s'", path)
|
|
zip.close()
|
|
|
|
return zip_filename
|
|
|
|
_ARCHIVE_FORMATS = {
|
|
'gztar': (_make_tarball, [('compress', 'gzip')], "gzip'ed tar-file"),
|
|
'bztar': (_make_tarball, [('compress', 'bzip2')], "bzip2'ed tar-file"),
|
|
'tar': (_make_tarball, [('compress', None)], "uncompressed tar file"),
|
|
'zip': (_make_zipfile, [], "ZIP file")
|
|
}
|
|
|
|
if _BZ2_SUPPORTED:
|
|
_ARCHIVE_FORMATS['bztar'] = (_make_tarball, [('compress', 'bzip2')],
|
|
"bzip2'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", "bztar"
|
|
or "gztar".
|
|
|
|
'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.
|
|
"""
|
|
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)
|
|
|
|
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 registery."""
|
|
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`
|
|
"""
|
|
try:
|
|
import zipfile
|
|
except ImportError:
|
|
raise ReadError('zlib not supported, cannot unpack this archive.')
|
|
|
|
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 `filename` to `extract_dir`
|
|
"""
|
|
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 = {
|
|
'gztar': (['.tar.gz', '.tgz'], _unpack_tarfile, [], "gzip'ed tar-file"),
|
|
'tar': (['.tar'], _unpack_tarfile, [], "uncompressed tar file"),
|
|
'zip': (['.zip'], _unpack_zipfile, [], "ZIP file")
|
|
}
|
|
|
|
if _BZ2_SUPPORTED:
|
|
_UNPACK_FORMATS['bztar'] = (['.bz2'], _unpack_tarfile, [],
|
|
"bzip2'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", or "gztar". 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.
|
|
"""
|
|
if extract_dir is None:
|
|
extract_dir = os.getcwd()
|
|
|
|
if format is not None:
|
|
try:
|
|
format_info = _UNPACK_FORMATS[format]
|
|
except KeyError:
|
|
raise ValueError("Unknown unpack format '{0}'".format(format))
|
|
|
|
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')
|
|
|
|
def disk_usage(path):
|
|
"""Return disk usage statistics about the given path.
|
|
|
|
Returned valus 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 os.name == 'nt':
|
|
|
|
import nt
|
|
__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 valus 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.
|
|
"""
|
|
|
|
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)
|