#!/usr/bin/env python
# Copyright 2006-2023 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

import os
import signal
import sys

# For compatibility with Python < 3.8
raise_signal = getattr(
    signal, "raise_signal", lambda signum: os.kill(os.getpid(), signum)
)


# Inherit from KeyboardInterrupt to avoid a traceback from asyncio.
class SignalInterrupt(KeyboardInterrupt):
    def __init__(self, signum):
        self.signum = signum


def signal_interrupt(signum, _frame):
    raise SignalInterrupt(signum)


def debug_signal(_signum, _frame):
    import pdb

    pdb.set_trace()


# Prevent "[Errno 32] Broken pipe" exceptions when writing to a pipe.
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
signal.signal(signal.SIGTERM, signal_interrupt)
signal.signal(signal.SIGUSR1, debug_signal)

from os import path as osp

if osp.isfile(
    osp.join(osp.dirname(osp.dirname(osp.realpath(__file__))), ".portage_not_installed")
):
    sys.path.insert(
        0, osp.join(osp.dirname(osp.dirname(osp.realpath(__file__))), "lib")
    )
import portage

portage._internal_caller = True
portage._disable_legacy_globals()
from portage.elog import mod_echo
from portage.exception import IsADirectory, ParseError, PermissionDenied
from portage.util._eventloop.global_event_loop import global_event_loop
from _emerge.main import emerge_main


def main():
    portage.process.sanitize_fds()
    try:
        retval = emerge_main()
    except PermissionDenied as e:
        sys.stderr.write(f"Permission denied: '{str(e)}'\n")
        sys.exit(e.errno)
    except IsADirectory as e:
        sys.stderr.write(
            f"'{str(e)}' is a directory, but should be a file!\n"
            "See portage man page for information on "
            "which files may be directories.\n"
        )
        sys.exit(e.errno)
    except ParseError as e:
        sys.stderr.write(f"{str(e)}\n")
        sys.exit(1)
    except (KeyboardInterrupt, SystemExit):
        raise
    except Exception:
        # If an unexpected exception occurs then we don't want the
        # mod_echo output to obscure the traceback, so dump the
        # mod_echo output before showing the traceback.
        import traceback

        tb_str = traceback.format_exc()
        mod_echo.finalize()
        sys.stderr.write(tb_str)
        sys.exit(1)
    sys.exit(retval)


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt as e:
        # This block ensures that ^C interrupts are handled quietly. We handle
        # KeyboardInterrupt instead of installing a SIGINT handler, since
        # exiting from signal handlers intermittently causes python to ignore
        # the SystemExit exception with a message like this:
        # Exception SystemExit: 130 in <function remove at 0x7fd2146c1320> ignored
        signum = getattr(e, "signum", signal.SIGINT)
        signal.signal(signum, signal.SIG_DFL)
        sys.stderr.write(f"\n\nExiting on signal {signum}\n")
        sys.stderr.flush()
        raise_signal(signum)
    finally:
        # Only close the event loop for __main__,
        # since outside of __main__ it would close the
        # event loop for child processes when using
        # the multiprocessing spawn start method.
        global_event_loop().close()
