shutil2.py

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'''
@file shutil2.py
@brief a better shutil.copytree replacement

$LicenseInfo:firstyear=2007&license=mit$

Copyright (c) 2007-2008, Linden Research, Inc.

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'''

#
# shutil2.py
# Taken from http://www.scons.org/wiki/AccumulateBuilder
# the stock copytree sucks because it insists that the
# target dir not exist
#

import os.path
import shutil

def copytree(src, dest, symlinks=False):
    """My own copyTree which does not fail if the directory exists.
    
    Recursively copy a directory tree using copy2().

    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.
    
    Behavior is meant to be identical to GNU 'cp -R'.    
    """
    def copyItems(src, dest, symlinks=False):
        """Function that does all the work.
        
        It is necessary to handle the two 'cp' cases:
        - destination does exist
        - destination does not exist
        
        See 'cp -R' documentation for more details
        """
        for item in os.listdir(src):
           srcPath = os.path.join(src, item)
           if os.path.isdir(srcPath):
               srcBasename = os.path.basename(srcPath)
               destDirPath = os.path.join(dest, srcBasename)
               if not os.path.exists(destDirPath):
                   os.makedirs(destDirPath)
               copyItems(srcPath, destDirPath)
           elif os.path.islink(item) and symlinks:
               linkto = os.readlink(item)
               os.symlink(linkto, dest)
           else:
               shutil.copy2(srcPath, dest)

    # case 'cp -R src/ dest/' where dest/ already exists
    if os.path.exists(dest):
       destPath = os.path.join(dest, os.path.basename(src))
       if not os.path.exists(destPath):
           os.makedirs(destPath)
    # case 'cp -R src/ dest/' where dest/ does not exist
    else:
       os.makedirs(dest)
       destPath = dest
    # actually copy the files
    copyItems(src, destPath)

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