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svn+ssh://pythondev@svn.python.org/python/trunk ........ r69100 | antoine.pitrou | 2009-01-29 21:19:34 +0100 (jeu., 29 janv. 2009) | 5 lines Issue #2047: shutil.move() could believe that its destination path was inside its source path if it began with the same letters (e.g. "src" vs. "src.new"). ........
275 lines
8.4 KiB
Python
275 lines
8.4 KiB
Python
"""Utility functions for copying 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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__all__ = ["copyfileobj","copyfile","copymode","copystat","copy","copy2",
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"copytree","move","rmtree","Error"]
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class Error(EnvironmentError):
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pass
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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):
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"""Copy data from src to dst"""
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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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fsrc = None
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fdst = None
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try:
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fsrc = open(src, 'rb')
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fdst = open(dst, 'wb')
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copyfileobj(fsrc, fdst)
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finally:
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if fdst:
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fdst.close()
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if fsrc:
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fsrc.close()
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def copymode(src, dst):
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"""Copy mode bits from src to dst"""
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if hasattr(os, 'chmod'):
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st = os.stat(src)
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mode = stat.S_IMODE(st.st_mode)
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os.chmod(dst, mode)
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def copystat(src, dst):
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"""Copy all stat info (mode bits, atime, mtime, flags) from src to dst"""
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st = os.stat(src)
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mode = stat.S_IMODE(st.st_mode)
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if hasattr(os, 'utime'):
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os.utime(dst, (st.st_atime, st.st_mtime))
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if hasattr(os, 'chmod'):
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os.chmod(dst, mode)
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if hasattr(os, 'chflags') and hasattr(st, 'st_flags'):
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os.chflags(dst, st.st_flags)
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def copy(src, dst):
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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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"""
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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)
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copymode(src, dst)
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def copy2(src, dst):
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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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"""
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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)
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copystat(src, dst)
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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):
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"""Recursively copy a directory tree using copy2().
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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.
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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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XXX Consider this example code rather than the ultimate tool.
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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 symlinks and os.path.islink(srcname):
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linkto = os.readlink(srcname)
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os.symlink(linkto, dstname)
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elif os.path.isdir(srcname):
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copytree(srcname, dstname, symlinks, ignore)
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else:
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copy2(srcname, dstname)
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# XXX What about devices, sockets etc.?
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except (IOError, os.error) as why:
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errors.append((srcname, dstname, str(why)))
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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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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 as err:
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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 as err:
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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.
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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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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.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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