#!/usr/bin/env python
# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

#
# archive-conf -- save off a config file in the dispatch-conf archive dir
#
#  Written by Wayne Davison <gentoo@blorf.net> with code snagged from
#  Jeremy Wohl's dispatch-conf script and the portage chkcontents script.
#

import subprocess
import sys

from os import path as osp

if osp.isfile(
    osp.join(osp.dirname(osp.dirname(osp.realpath(__file__))), ".portage_not_installed")
):
    sys.path.insert(
        0, osp.join(osp.dirname(osp.dirname(osp.realpath(__file__))), "lib")
    )
import portage

portage._internal_caller = True

import portage.dispatch_conf
from portage import os
from portage.checksum import perform_md5

MANDATORY_OPTS = ["archive-dir"]


def archive_conf():
    args = []
    content_files = []
    md5_match_hash = {}

    options = portage.dispatch_conf.read_config(MANDATORY_OPTS)

    for conf in sys.argv[1:]:
        if not os.path.isabs(conf):
            conf = os.path.abspath(conf)
        args += [conf]
        md5_match_hash[conf] = ""

    # Find all the CONTENTS files in VDB_PATH.
    eroot_vdb_path = os.path.join(portage.settings["EROOT"], portage.VDB_PATH)
    find = subprocess.run(
        ["find", eroot_vdb_path, "-type", "f", "-name", "CONTENTS"],
        capture_output=True,
        text=True,
    )
    content_files += find.stdout.splitlines()

    # Search for the saved md5 checksum of all the specified config files
    # and see if the current file is unmodified or not.
    try:
        todo_cnt = len(args)
        for filename in content_files:
            filename = filename.rstrip()
            try:
                contents = open(filename)
            except OSError as e:
                print(
                    f"archive-conf: Unable to open {filename}: {e}",
                    file=sys.stderr,
                )
                sys.exit(1)
            lines = contents.readlines()
            for line in lines:
                items = line.split()
                if items[0] == "obj":
                    for conf in args:
                        if items[1] == conf:
                            stored = items[2].lower()
                            real = perform_md5(conf).lower()
                            if stored == real:
                                md5_match_hash[conf] = conf
                            todo_cnt -= 1
                            if todo_cnt == 0:
                                raise StopIteration()
    except StopIteration:
        pass

    for conf in args:
        archive = os.path.join(options["archive-dir"], conf.lstrip("/"))
        if options["use-rcs"] == "yes":
            portage.dispatch_conf.rcs_archive(archive, conf, md5_match_hash[conf], "")
            if md5_match_hash[conf]:
                portage.dispatch_conf.rcs_archive_post_process(archive)
        else:
            portage.dispatch_conf.file_archive(archive, conf, md5_match_hash[conf], "")
            if md5_match_hash[conf]:
                portage.dispatch_conf.file_archive_post_process(archive)


# run
if len(sys.argv) > 1:
    archive_conf()
else:
    print("Usage: archive-conf /CONFIG/FILE [/CONFIG/FILE...]", file=sys.stderr)