Ignore function generator for `shutil.copytree` function.

ignore_patterns_relative.py

def ignore_patterns_relative(*patterns):
    """Function that can be used as copytree() ignore parameter.
    Patterns used can exclude with relative path names.
    """
    def _ignore_patterns(path, names):
        ignored_names = []
        for pattern in patterns:
            relative_names = [os.path.join(path, name) for name in names]
            matched_names = fnmatch.filter(relative_names, pattern)
            ignored_names.extend(os.path.basename(name) for name in matched_names)
        return set(ignored_names)
    return _ignore_patterns
    
# USAGE
from shutil import copytree

#Only ignore text files found in the first level directory
copytree('/home/from/', '/home/to/', ignore=ignore_patterns_relative('/home/from/*.txt'))

Thank you! Tearing my hair out to get this working...