cpython/Lib/shutil.py

# Module 'shutil' -- utility functions usable in a shell-like program.
# XXX The copy*() functions here don't copy the data fork on Mac.
# XXX Consider this example code rather than flexible tools.

import os

MODEBITS = 010000	# Lower 12 mode bits
# Change this to 01000 (9 mode bits) to avoid copying setuid etc.

# Copy data from src to dst
#
def copyfile(src, dst):
	fsrc = None
	fdst = None
	try:
		fsrc = open(src, 'rb')
		fdst = open(dst, 'wb')
		while 1:
			buf = fsrc.read(16*1024)
			if not buf:
				break
			fdst.write(buf)
	finally:
		if fdst:
			fdst.close()
		if fsrc:
			fsrc.close()

# Copy mode bits from src to dst
#
def copymode(src, dst):
	st = os.stat(src)
	mode = divmod(st[0], MODEBITS)[1]
	os.chmod(dst, mode)

# Copy all stat info (mode bits, atime and mtime) from src to dst
#
def copystat(src, dst):
	st = os.stat(src)
	mode = divmod(st[0], MODEBITS)[1]
	os.chmod(dst, mode)
	os.utime(dst, st[7:9])

# Copy data and mode bits ("cp src dst").
# Support directory as target.
#
def copy(src, dst):
	if os.path.isdir(dst):
		dst = os.path.join(dst, os.path.basename(src))
	copyfile(src, dst)
	copymode(src, dst)

# Copy data and all stat info ("cp -p src dst").
# Support directory as target.
#
def copy2(src, dst):
	if os.path.isdir(dst):
		dst = os.path.join(dst, os.path.basename(src))
	copyfile(src, dst)
	copystat(src, dst)

# Recursively copy a directory tree.
# The destination must not already exist.
#
def copytree(src, dst):
	names = os.listdir(src)
	os.mkdir(dst, 0777)
	for name in names:
		srcname = os.path.join(src, name)
		dstname = os.path.join(dst, name)
		#print 'Copying', srcname, 'to', dstname
		try:
			#if os.path.islink(srcname):
			#	linkto = os.readlink(srcname)
			#	os.symlink(linkto, dstname)
			#elif os.path.isdir(srcname):
			if os.path.isdir(srcname):
				copytree(srcname, dstname)
			else:
				copy2(srcname, dstname)
			# XXX What about devices, sockets etc.?
		except os.error, why:
			print 'Could not copy', srcname, 'to', dstname,
			print '(', why[1], ')'