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#!/usr/bin/python3
# Copyright 2024 Helmut Grohne <helmut@subdivi.de>
# SPDX-License-Identifier: GPL-3
"""Vaguely emulate fakeroot using a user namespace that maps the current user
and group to root and the rest of the low range to a subuid range without
performing any chroot. This is similar to unshare --map-root-user --map-auto.
"""
import os
import sys
if __file__.split("/")[-2:-1] == ["examples"]:
sys.path.insert(0, "/".join(__file__.split("/")[:-2]))
import linuxnamespaces
def main() -> None:
uidmap = [
linuxnamespaces.IDMapping(0, os.getuid(), 1),
linuxnamespaces.IDAllocation.loadsubid("uid").allocatemap(65535, 1),
]
gidmap = [
linuxnamespaces.IDMapping(0, os.getgid(), 1),
linuxnamespaces.IDAllocation.loadsubid("gid").allocatemap(65535, 1),
]
linuxnamespaces.unshare_user_idmap(uidmap, gidmap)
os.execlp(os.environ["SHELL"], os.environ["SHELL"])
if __name__ == "__main__":
main()
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