Forked from https://gist.github.com/hollobon/7579947/ This script recursively checks a directory's files for hardlinks. If there's no other links to a file the name is printed. TODO: Add flags to only print filenames above or below a link count threshold. Add a flag to be recursive.

hardlink_checker

import os
import sys
import tempfile
import win32file
from glob import glob
 
def get_link_count(filename):
    if os.path.isdir(filename):
        dwFlagsAndAttributes = win32file.FILE_FLAG_BACKUP_SEMANTICS
    else:
        dwFlagsAndAttributes = 0
 
    handle = win32file.CreateFile(filename,
                                  win32file.GENERIC_READ,
                                  win32file.FILE_SHARE_READ,
                                  None,
                                  win32file.OPEN_EXISTING,
                                  dwFlagsAndAttributes,
                                  None)
 
    (attributes, created_at, accessed_at, written_at, volume, file_hi, file_lo,
     n_links, index_hi, index_lo) = win32file.GetFileInformationByHandle(handle)
 
    return n_links
    
def check_links_in_dir(dirname):
	print(os.linesep+"Checking for hardlinks in: '"+dirname+"'")
	if os.path.isdir(dirname):
			print("The following files have no hardlinks elsewhere:")
			for fname in os.listdir(dirname):
				fpath = os.path.join(dirname,fname)
				if os.path.isfile(fpath):
					hardcount = get_link_count(fpath)
					if hardcount == 1:
						print(fname)
				elif os.path.isdir(fpath):
					check_links_in_dir(fpath)
				else:
					print("'"+fpath+"' is not a file!")
	else:
		print("ERROR. Not a directory.")

def main():
	temp_dirname = glob(sys.argv[1])
	if len(temp_dirname) >= 1:
		dirname = temp_dirname[0]
		if os.path.isdir(dirname):
			check_links_in_dir(dirname)
	else:
		print("Error, improper pathname.")
 
 
if __name__ == "__main__":
    sys.exit(main())