ecryptfs-map: maps a decrypted filename to the ecrypfs-encrypted counterpart (and vice versa) and outputs the filename to the console

ecryptfs-map.py

#!/usr/bin/python3
# maps a decrypted filename to the ecrypfs-encrypted counterpart (and vice versa)
# and outputs the filename to the console
#
# Notes:
# much faster than ecryptfs-find
# because contrary to ecryptfs-find, does not iterate over the whole filesystem tree with find 
# url for latest version: https://gist.github.com/monperrus/7a114ccc1c2fd20dcc5e852cdf813c5d
# author: Martin Monperrus
# license: public domain

import os
import re
import sys


if len(sys.argv)<2:
    print("usage: ecryptfs-map <decrypted filename>")
    sys.exit(-1)

HOME=os.environ["HOME"]
if not HOME.endswith("/"): HOME+="/"
os.chdir(HOME)


if os.path.exists(sys.argv[1]):
    ## case DECRYPTED -> ENCRYPTED
    assert HOME[-1] == "/"
    mapped_pathelem = HOME[0:-1]+"/.Private" 

    path_elements = os.path.abspath(sys.argv[1]).replace(HOME,'').split(os.sep)

    for index  in range(0,len(path_elements)):
        pathelem = path_elements[index]
        #print(pathelem)
        if pathelem == ".Private": continue
        #print(path_elements[0:index+1], mapped_pathelem)
        inode = os.stat(os.sep.join(path_elements[0:index+1])).st_ino
        for i in os.scandir(mapped_pathelem):
            if i.inode() == inode and i.name != pathelem:
                # found corresponding path elem
                mapped_pathelem += os.sep+ i.name
                #print(mapped_pathelem)
                break

if os.path.exists(".Private/"+sys.argv[1]):
    # case "ENCRYPTED -> DECRYPTED"
    mapped_pathelem = HOME[0:-1] 
    
    path_elements = (".Private/"+sys.argv[1]).split(os.sep)

    for index  in range(0,len(path_elements)):
        pathelem = path_elements[index]
        if pathelem == ".Private": continue
        #print(path_elements[0:index+1], mapped_pathelem)
        inode = os.stat(os.sep.join(path_elements[0:index+1])).st_ino
        #print(pathelem,inode)
        for i in os.scandir(mapped_pathelem):
            if i.inode() == inode and i.name != pathelem:
                # found corresponding path elem
                mapped_pathelem += os.sep+ i.name
                #print(mapped_pathelem)
                break


print(mapped_pathelem)