Create rclone --exclude-from list by recursively visting .gitignore files

rclone-exclude.py

#!/usr/bin/env python
import os
import subprocess

def append_parentpath(path, ignore_string):
    return [path + '/' + line for line in ignore_string.splitlines()]

def traverse_and_generate(path, printpath=""):
    dirs = os.listdir(path)
    if '.git' in dirs:
        # Generate IgnoreList
        os.chdir(path)
        print(path)
        ignore_list = subprocess.run(['git', 'ls-files', '--others', '--ignored', '--exclude-standard'], capture_output = True).stdout
        return append_parentpath(printpath, ignore_list.decode())

    ignore_list = []
    for basename in dirs:
        fullname = os.path.join(path, basename)
        if os.path.isdir(fullname):
            for item in traverse_and_generate(fullname, printpath+"/"+basename):
                ignore_list.append(item)

    return ignore_list

def write_list_to_file(lines , f):
    with open(f, 'w') as file:
        for l in lines:
            file.write(l+'\n')

def main():
    root_path = os.sys.argv[1]
    write_file_path = os.sys.argv[2]
    l = traverse_and_generate(root_path)
    relative_path = os.path.relpath(write_file_path, root_path)
    if relative_path[:3] != "../":
        l.append(relative_path)
    write_list_to_file(l, write_file_path)

if len(os.sys.argv) < 3:
    print("""rclone-exclude.py : Generate exclude fileslist from .gitignores
USAGE rclone-exclude.py RootDir ExcludeFile
RootDir : Root of directory tree for which to generate exclude list
ExcludeFile : File to write the exclude files list""")
else:
    main()