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262 lines
8.1 KiB
Python
262 lines
8.1 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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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), 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, 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 WindowsError:
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# can't copy file access times on Windows
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pass
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except OSError, why:
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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, 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, 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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return abspath(dst).startswith(abspath(src))
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