find-deps: pacman config can be changed via env

from argparse import ArgumentParser

from elftools.elf.elffile import ELFFile

from elftools.elf.dynamic import DynamicSection, DynamicSegment

from os import walk

from os import walk, environ

from os.path import join, exists, isdir, isfile, normpath, realpath

from pprint import pprint

from pycman import config

    path = normpath(realpath(path)).lstrip('/')

    global PACKAGES

    if PACKAGES is None:

        PACKAGES = config.init_with_config("/etc/pacman.conf").get_localdb().pkgcache

        PACKAGES = config.init_with_config(environ.get("PACMAN_CONF",

            "/etc/pacman.conf")).get_localdb().pkgcache

    for pkg in PACKAGES:

        if path in [ x[0] for x in pkg.files]:

            return(pkg.name)