Ubuntu: /etc/rc?.d の状況を確認する

/etc/rcN.d の状況を表示するだけの簡単なスクリプトです。

list-rc.d

#!/usr/bin/env python3

import argparse
import os
import sys


def is_ixusr(path):
    fst = os.stat(path)
    return bool(os.path.stat.S_ISREG(fst.st_mode) and
                fst.st_mode & os.path.stat.S_IXUSR)


def listdirex(path):
    return list(filter(is_ixusr, (f'{path}/{e}' for e in os.listdir(path))))


def list_init_d(init_level, etcdir):
    service = {f: [] for f in listdirex(f'{etcdir}/init.d')}
    flist = ([os.path.realpath(f), [l, f]]
             for l in init_level for f in listdirex(f'{etcdir}/rc{l}.d'))
    for real, (level, link) in filter(lambda d: d[0] in service, flist):
        service[real].append([level, os.path.basename(link)])
    return tuple(sorted((os.path.basename(name), tuple(sorted(mode)))
                        for name, mode in service.items()))


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-v', '--verbose', action='store_true', default=False)
    parser.add_argument('-e', '--etc', metavar='DIR', dest='etc_dir', default='/etc')
    parser.add_argument('-l', '--level', metavar='INIT', default='0123456S')
    parser.add_argument('services', metavar='service', nargs='*')
    args = parser.parse_args()

    verbose = args.verbose
    init_level = args.level
    etc_dir = args.etc_dir
    services = args.services

    init_list = list_init_d(init_level, etc_dir)
    initd = init_list if not services else tuple(
        d for d in init_list if d[0] in services)
    wname = max([0, *[len(n) for n, _ in initd]])
    padding = ' ' * wname
    for name, mode in initd:
        mon = {l: 'off' for l in init_level}
        mon |= {l[0]: 'on ' for l in filter(
            lambda s: s[1][0] == 'S', mode)}
        mon = '  '.join(f'{k}:{mon[k]}' for k in init_level)
        print(f'{(name+padding)[:wname]}  {mon}')
        if verbose:
            msg = '\n'.join(f'{padding}    rc{l}.d/{f}'
                            for l, f in mode if l in init_level)
            print(msg + '\n' if msg else '')


main()

実行結果

$ list-rc.d postfix kmod
kmod     0:off  1:off  2:off  3:off  4:off  5:off  6:off  S:on 
postfix  0:off  1:off  2:on   3:on   4:on   5:on   6:off  S:off
$ list-rc.d postfix kmod -v
kmod     0:off  1:off  2:off  3:off  4:off  5:off  6:off  S:on 
           rcS.d/S01kmod

postfix  0:off  1:off  2:on   3:on   4:on   5:on   6:off  S:off
           rc0.d/K01postfix
           rc1.d/K01postfix
           rc2.d/S01postfix
           rc3.d/S01postfix
           rc4.d/S01postfix
           rc5.d/S01postfix
           rc6.d/K01postfix