# updatelocal.py
# During a BIRCH update, this script checks to make sure
# that all files found in the new copy of $BIRCH/local-generic
# are also present in the existing $BIRCH/local directory. 
# Files not found in $BIRCH/local are copied from $BIRCH/local-generic
# 

# Set variables for local-generic, local, and current
# directories

import os, os.path, sys, shutil

def update_local():
	UPDIR = os.path.abspath(os.path.join(os.getcwd(), os.pardir))
	LOCAL = os.path.join(UPDIR, "local")
	LOCALGENERIC = os.path.join(UPDIR, "local-generic")
	print ("LOCAL        " + LOCAL)
	print ("LOCALGENERIC " + LOCALGENERIC)
	newlocalfiles = open("NewLocalFiles.list")
	
	#---------------------------------------------------------------------------
	# When a directory is not found, copy whole directory
	# in a single step. Otherwise, copy one file at a time.
	for name in newlocalfiles:

		# Note: we have to check to see if $name is a link FIRST, before checking
		# to see if it is a file or directory. Apparently, the shell considers a 
		# link to also be a file, so
		# -f $LOCALGENERIC/$name would be true for a link.
                name = name.strip()
		gen_name = os.path.join(LOCALGENERIC, name)
		local_name = os.path.join(LOCAL, name)		

		if os.path.exists(gen_name) :
                    if not os.path.exists(local_name):
                        # symbolic link
                        if os.path.islink(gen_name):
                            print ('Copying link ' + gen_name)
                            os.symlink(os.readlink(gen_name),local_name)
                        # directory
                        elif os.path.isdir(gen_name):
                            print ('Copying directory ' + gen_name)
                            shutil.copytree(gen_name, local_name)
                        #file
                        else:
                            print ('Copying file ' + gen_name)
                            # shutil.copy2 preserves metadata, such as date of file creation.
                            # shutil.copy does not.
                            shutil.copy2(gen_name, local_name)
	     
	newlocalfiles.close()
	
if __name__=="__main__":
	update_local()