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#!/usr/bin/python3
# Copyright 2024 Helmut Grohne <helmut@subdivi.de>
# SPDX-License-Identifier: GPL-3
"""Construct a network namespace with a host0 interface backed by slirp4netns.
"""
import os
import sys
if __file__.split("/")[-2:-1] == ["examples"]:
sys.path.insert(0, "/".join(__file__.split("/")[:-2]))
import linuxnamespaces
def main() -> None:
mainpid = os.getpid()
rfd, wfd = os.pipe()
if os.fork() == 0:
os.set_inheritable(rfd, True)
os.execlp(
"slirp4netns",
"slirp4netns",
"--exit-fd",
"%d" % rfd,
"--configure",
"--disable-host-loopback",
"%d" % mainpid,
"host0",
)
linuxnamespaces.unshare_user_idmap_nohelper(
0,
0,
linuxnamespaces.CloneFlags.NEWUSER | linuxnamespaces.CloneFlags.NEWNET,
)
# Leave write end of --exit-fd behind as fd 252.
os.dup2(wfd, 252)
os.close(wfd)
os.execlp(os.environ["SHELL"], os.environ["SHELL"])
if __name__ == "__main__":
main()
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