isar-kylin-addpackage/scripts/wic_fakeroot

#!/usr/bin/env python3
#
# wic needs a FAKEROOT cmd to run, the default is pseudo. In Isar we do/can not
# use pseudo. And we call wic as root to begin with, so this script could be a
# dummy doing nothing. It is almost a dummy ...
#
# If the fsck hack ever becomes obsolete, FAKEROOTCMD ?= "true;" can be used
#
# This software is a part of Isar.
# Copyright (C) 2018 Siemens AG
#
import os
import sys
import subprocess

args = sys.argv
args.pop(0)
cmd = args[0]

# expect to be running as root
# we could loosen that and execv(sudo, args) but even some early
# "du"s fail, which do not use the fakeroot-wrapper
#  i.e. in wics partition.py the "du -ks" fails on
#    var/cache/apt/archives/partial
#    rootfs/root ...
assert os.geteuid() == 0, "wic_fakeroot must be run as root!"

# Check if we are calling the pseudo command itself. Return 0
# for standalone pseudo operations.
if cmd.startswith('-'):
    sys.exit(0)

# e2fsck <= 1.43.5 returns 1 on non-errors (stretch and before affected)
# treat 1 as safe ... the filesystem was successfully repaired and is OK
if cmd.startswith('fsck.'):
    ret = subprocess.call(args)
    sys.exit(0 if ret == 1 else ret)

os.execvp(cmd, args)