HardLink all files into single directory

linkall.py

#!/usr/bin/env python
u = """Link all files from a directory and its descendants into a specified destination directory.
This 'flattens' the source dir into the destination dir

Usage: %s source_dir destination_dir 
"""

import os
import sys
from progress.bar import Bar

if __name__ == '__main__':
    if len(sys.argv) < 3:
        print(u % __file__)
        sys.exit(1)
    if not (os.path.isdir(sys.argv[2]) and os.path.isdir(sys.argv[1])):
        print('Both src and dest need to be directories')
        print(u % __file__)
        sys.exit(2)
    files = [os.path.join(dirpath, filename) for dirpath, dirnames, filenames in os.walk(sys.argv[1]) for filename in filenames]
    bar = Bar('Making links', max=len(files))
    for filepath in files:
        filename = os.path.split(filepath)[-1]
        dst = os.path.join(sys.argv[2], filename)
        if not os.path.exists(dst):
            os.link(filepath, dst)
        bar.next()
    bar.finish()
    print(len(files))