home *** CD-ROM | disk | FTP | other *** search
- """Utility functions for copying 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
- from os.path import abspath
- import fnmatch
-
- __all__ = ["copyfileobj","copyfile","copymode","copystat","copy","copy2",
- "copytree","move","rmtree","Error"]
-
- class Error(EnvironmentError):
- pass
-
- try:
- WindowsError
- except NameError:
- WindowsError = None
-
- def copyfileobj(fsrc, fdst, length=16*1024):
- """copy data from file-like object fsrc to file-like object fdst"""
- while 1:
- buf = fsrc.read(length)
- if not buf:
- break
- fdst.write(buf)
-
- def _samefile(src, dst):
- # Macintosh, Unix.
- 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 copyfile(src, dst):
- """Copy data from src to dst"""
- if _samefile(src, dst):
- raise Error, "`%s` and `%s` are the same file" % (src, dst)
-
- fsrc = None
- fdst = None
- try:
- fsrc = open(src, 'rb')
- fdst = open(dst, 'wb')
- copyfileobj(fsrc, fdst)
- finally:
- if fdst:
- fdst.close()
- if fsrc:
- fsrc.close()
-
- def copymode(src, dst):
- """Copy mode bits from src to dst"""
- if hasattr(os, 'chmod'):
- st = os.stat(src)
- mode = stat.S_IMODE(st.st_mode)
- os.chmod(dst, mode)
-
- def copystat(src, dst):
- """Copy all stat info (mode bits, atime, mtime, flags) from src to dst"""
- st = os.stat(src)
- mode = stat.S_IMODE(st.st_mode)
- if hasattr(os, 'utime'):
- os.utime(dst, (st.st_atime, st.st_mtime))
- if hasattr(os, 'chmod'):
- os.chmod(dst, mode)
- if hasattr(os, 'chflags') and hasattr(st, 'st_flags'):
- os.chflags(dst, st.st_flags)
-
-
- def copy(src, dst):
- """Copy data and mode bits ("cp src dst").
-
- The destination may be a directory.
-
- """
- if os.path.isdir(dst):
- dst = os.path.join(dst, os.path.basename(src))
- copyfile(src, dst)
- copymode(src, dst)
-
- def copy2(src, dst):
- """Copy data and all stat info ("cp -p src dst").
-
- The destination may be a directory.
-
- """
- if os.path.isdir(dst):
- dst = os.path.join(dst, os.path.basename(src))
- copyfile(src, dst)
- copystat(src, 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(src, dst, symlinks=False, ignore=None):
- """Recursively copy a directory tree using copy2().
-
- The destination directory must not already exist.
- 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.
-
- 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.
-
- XXX Consider this example code rather than the ultimate tool.
-
- """
- names = os.listdir(src)
- if ignore is not None:
- ignored_names = ignore(src, names)
- else:
- ignored_names = set()
-
- os.makedirs(dst)
- errors = []
- for name in names:
- if name in ignored_names:
- continue
- srcname = os.path.join(src, name)
- dstname = os.path.join(dst, name)
- try:
- if symlinks and os.path.islink(srcname):
- linkto = os.readlink(srcname)
- os.symlink(linkto, dstname)
- elif os.path.isdir(srcname):
- copytree(srcname, dstname, symlinks, ignore)
- else:
- copy2(srcname, dstname)
- # XXX What about devices, sockets etc.?
- except (IOError, os.error), why:
- errors.append((srcname, dstname, str(why)))
- # catch the Error from the recursive copytree so that we can
- # continue with other files
- except Error, err:
- errors.extend(err.args[0])
- try:
- copystat(src, dst)
- except OSError, why:
- if WindowsError is not None and isinstance(why, WindowsError):
- # Copying file access times may fail on Windows
- pass
- else:
- errors.extend((src, dst, str(why)))
- if errors:
- raise Error, errors
-
- 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 os.listdir, os.remove, or os.rmdir;
- 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.
-
- """
- if ignore_errors:
- def onerror(*args):
- pass
- elif onerror is None:
- def onerror(*args):
- raise
- try:
- if os.path.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
- names = []
- try:
- names = os.listdir(path)
- except os.error, err:
- onerror(os.listdir, path, sys.exc_info())
- for name in names:
- fullname = os.path.join(path, name)
- try:
- mode = os.lstat(fullname).st_mode
- except os.error:
- mode = 0
- if stat.S_ISDIR(mode):
- rmtree(fullname, ignore_errors, onerror)
- else:
- try:
- os.remove(fullname)
- except os.error, err:
- onerror(os.remove, fullname, sys.exc_info())
- try:
- os.rmdir(path)
- except os.error:
- onerror(os.rmdir, path, sys.exc_info())
-
-
- 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.
- return os.path.basename(path.rstrip(os.path.sep))
-
- def move(src, dst):
- """Recursively move a file or directory to another location. This is
- similar to the Unix "mv" command.
-
- 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.
- A lot more could be done here... A look at a mv.c shows a lot of
- the issues this implementation glosses over.
-
- """
- real_dst = dst
- if os.path.isdir(dst):
- 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.isdir(src):
- if destinsrc(src, dst):
- raise Error, "Cannot move a directory '%s' into itself '%s'." % (src, dst)
- copytree(src, real_dst, symlinks=True)
- rmtree(src)
- else:
- copy2(src, real_dst)
- os.unlink(src)
-
- def destinsrc(src, dst):
- src = abspath(src)
- dst = 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)
-