удаление всей хуйни

import re
import subprocess
import os
'''
Очистка системы от таргетов,лунов,прикрученных к ним устройств, lvm-ов,raid-ов и bcache
'''
def main():
    clear_scst()
    clear_bcache_backing_device()
    clear_lvm()
    clear_raids()
    clear_bcache_caching_device()

def clear_raids():
    raids = str(subprocess.check_output('cat /proc/mdstat', shell=True))
    cock = raids.find('md')
    my_raids = raids[cock:]
    new_raids = my_raids.split('[U' or '[_')
    for string in new_raids:
        md = re.findall(r'(md\d+)', string)
        os.system('mdadm -S /dev/' + ''.join(md))
    raid = re.findall(r'(\w+\[\d+\])', my_raids)
    names = re.findall(r'[a-zA-Z]+', ''.join(raid))
    for name in names:
        sname = ''.join(name)
        os.system('mdadm --zero-superblock /dev/' + sname)
def clear_lvm():

    lvms = str(subprocess.check_output('pvdisplay', shell=True))
    new_lvms = lvms.split('--- Physical volume ---')
    for lvm in new_lvms:
        #pv_name = re.findall(r'/\w+/\w+',lvm) # заготовка для парсинга лунов
        VG_name=lvm.find('VG Name')
        PV_size = lvm.find('PV Size')
        my_lvm = lvm[VG_name:PV_size]
        lvm_name=re.findall(r'(\w+\\n)', ''.join(my_lvm))
        slvm = ''.join(lvm_name).strip('\\n')
        os.system('lvremove '+slvm)
        os.system('vgremove '+slvm)

def clear_scst():
    #targets = str(subprocess.check_output('scstadmin -list_target', shell=True))
    #targets = 'Driver       Target   --------------------------------------  iscsi        iqn.2015-05.iscsi.lan:tgt  copy_manager copy_manager_tgt         '
    #target_name = re.findall(r'iqn\.\d+\-\d+\.(\w+.)*\:(\w+|\d+|\.|\-)+',targets) # заготовка для парсинга имён таргетов
    os.system('service scst restart')

def clear_bcache_backing_device():
    all_devices_for_parse = str(subprocess.check_output('lsblk', shell=True))
    backing_devices = set(re.findall(r'bcache\d+', all_devices_for_parse))
    for backing_device in backing_devices:
        os.system('echo 1 > /sys/block/'+backing_device+'/bcache/stop')
    lvms = set(re.findall(r'\w+-lv\d+', all_devices_for_parse))

    for lvm in lvms:
        new_lvm = lvm.replace('-', '/')
        os.system('wipefs -a /dev/'+new_lvm)


def clear_bcache_caching_device():
    all_devices_for_parse = str(subprocess.check_output('lsblk', shell=True))
    block_names=['sda', 'sdb', 'sdc', 'sdd', 'vdd', 'vdc', 'vdb']
    for block_name in block_names:
        print(block_name)
        csetuuid = str(subprocess.check_output('bcache-super-show /dev/'+block_name+' | grep cset.uuid | cut -c 12-48', shell=True))[2:-3]
        print(csetuuid)
        os.system('echo 1 > /sys/fs/bcache/'+csetuuid+'/stop')
        os.system('wipefs -a /dev/'+block_name)
if __name__ == '__main__':
    main()