"""Regression tests for disposable-VM isolation and trustworthy serial evidence."""
import importlib.util
from pathlib import Path
import socket
import select
import subprocess
import sys
import time
import tempfile
import threading
import unittest

SCRIPT = Path(__file__).resolve().parents[1] / 'dev/iso-smoke.py'


class SmokeTests(unittest.TestCase):
    def setUp(self):
        self.assertTrue(SCRIPT.is_file(), 'disposable ISO acceptance harness is missing')
        spec = importlib.util.spec_from_file_location('iso_smoke', SCRIPT)
        self.mod = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(self.mod)
        self.temp = tempfile.TemporaryDirectory()
        self.addCleanup(self.temp.cleanup)
        self.root = Path(self.temp.name)
        self.code = self.root / 'code.fd'
        self.variables = self.root / 'vars.fd'
        self.code.write_bytes(b'firmware')
        self.variables.write_bytes(b'fresh vars')

    def test_existing_disk_or_symlink_cannot_be_a_test_drive(self):
        disk = self.root / 'disk.qcow2'
        disk.write_bytes(b'original')
        with self.assertRaises(self.mod.SmokeError):
            self.mod.reserve_disk(disk)
        link = self.root / 'link.qcow2'
        link.symlink_to(disk)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.reserve_disk(link)
        self.assertEqual(disk.read_bytes(), b'original')

    def test_qemu_only_accepts_owned_regular_disk_and_readonly_iso(self):
        disk = self.root / 'disk.qcow2'
        self.mod.reserve_disk(disk)
        iso = self.root / 'trusted.iso'
        iso.write_bytes(b'ISO')
        argv = self.mod.qemu_argv('qemu', self.root, disk, self.code,
                                  self.variables, iso, 2048)
        drives = [argv[i + 1] for i, value in enumerate(argv[:-1]) if value == '-drive']
        self.assertTrue(any('format=qcow2' in item and str(disk) in item for item in drives))
        self.assertTrue(any('media=cdrom' in item and 'readonly=on' in item for item in drives))
        self.assertIn('accel=kvm', ' '.join(argv))
        disk.unlink()
        disk.symlink_to(iso)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.qemu_argv('qemu', self.root, disk, self.code,
                               self.variables, iso, 2048)

    def test_installed_reboot_has_no_optical_medium(self):
        disk = self.root / 'disk.qcow2'
        self.mod.reserve_disk(disk)
        argv = self.mod.qemu_argv('qemu', self.root, disk, self.code,
                                  self.variables, None, 2048)
        self.assertNotIn('media=cdrom', ' '.join(argv))
        self.assertNotIn('-cdrom', argv)

    def test_hardlinked_disk_is_refused(self):
        disk = self.root / 'disk.qcow2'
        self.mod.reserve_disk(disk)
        (self.root / 'alias').hardlink_to(disk)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.qemu_argv('qemu', self.root, disk, self.code,
                               self.variables, None, 2048)

    def test_result_frame_ignores_command_echo_and_preserves_failure(self):
        command = self.mod.frame_command('printf sentinel; false', 'testtoken')
        result = subprocess.run(['/bin/sh', '-c', command], capture_output=True)
        echo = command.encode() + b'\r\n'
        self.assertIsNone(self.mod.parse_frame(echo, 'testtoken'))
        self.assertEqual(self.mod.parse_frame(echo + result.stdout, 'testtoken'),
                         (1, b'sentinel'))

    def test_console_redacts_password_even_when_split_across_reads(self):
        one, two = socket.socketpair()
        self.addCleanup(one.close)
        self.addCleanup(two.close)
        log = self.root / 'serial.log'
        console = self.mod.Console(one, log, ['split-secret'])
        self.addCleanup(console.close)
        two.sendall(b'hello split-')
        console.read(0.1)
        two.sendall(b'secret goodbye')
        console.read(0.1)
        console.close()
        self.assertNotIn(b'split-secret', log.read_bytes())
        self.assertIn(b'[REDACTED]', log.read_bytes())

    def test_console_timeout_is_bounded_and_partial_frame_not_success(self):
        one, two = socket.socketpair()
        self.addCleanup(one.close)
        self.addCleanup(two.close)
        console = self.mod.Console(one, self.root / 'serial.log', [])
        self.addCleanup(console.close)
        two.sendall(b'\\036token:END:0\\037')
        with self.assertRaises(self.mod.SmokeError):
            console.command('true', timeout=0.05)

    def installer_console(self):
        one, two = socket.socketpair()
        self.addCleanup(two.close)
        console = self.mod.Console(one, self.root / 'installer.log', ['test-secret'])
        self.addCleanup(console.close)
        return console, two

    def test_captured_installer_refusal_fails_before_password_timeout(self):
        console, guest = self.installer_console()
        guest.sendall(b'\x1b]3008;type=command\x1b\\hydra-install: Command failed (1): '
                      b'findmnt --json --target /LiveOS/squashfs.img '
                      b'--output SOURCE,TARGET,FSTYPE,MAJ:MIN,OPTIONS: \r\n')
        with self.assertRaisesRegex(self.mod.SmokeError, 'Installer.*findmnt'):
            console.expect_installer(rb'Installed account password: ', 0.05, 'testtoken')

    def test_installer_shell_return_without_completion_is_failure_even_zero(self):
        for status in (0, 1, 127):
            with self.subTest(status=status):
                console, guest = self.installer_console()
                guest.sendall(b'\x1etesttoken:INSTALL_EXIT:' + str(status).encode() + b'\x1f')
                with self.assertRaisesRegex(self.mod.SmokeError, 'Installer.*INSTALL_EXIT'):
                    console.expect_installer(rb'Installation completed\. Diagnostic log: [^\r\n]+',
                                             0.05, 'testtoken')

    def test_installer_echo_cannot_fake_exit_and_complete_prompt_still_required(self):
        console, guest = self.installer_console()
        guest.sendall(self.mod.installer_command('testtoken').encode() + b'\r\n'
                      b'Installed account password: ')
        self.assertEqual(console.expect_installer(rb'Installed account password: ',
                         0.05, 'testtoken').group(), b'Installed account password: ')
        guest.sendall(b'Installation completed. Diagnostic')
        with self.assertRaisesRegex(self.mod.SmokeError, 'Timed out'):
            console.expect_installer(rb'Installation completed\. Diagnostic log: [^\r\n]+',
                                     0.05, 'testtoken')
        guest.sendall(b' log: /var/log/hydra-install.log\r\n')
        self.assertIn(b'/var/log/hydra-install.log', console.expect_installer(
            rb'Installation completed\. Diagnostic log: [^\r\n]+', 0.05, 'testtoken').group())

    def test_installer_wrapper_marks_actual_shell_return_and_redacts_error(self):
        console, guest = self.installer_console()
        fake_sudo = self.root / 'sudo'
        fake_sudo.write_text('#!/bin/sh\nprintf "hydra-install: test-secret refused\\n"\nexit 1\n')
        fake_sudo.chmod(0o700)
        result = subprocess.run(['/bin/sh', '-c', self.mod.installer_command('testtoken')],
                                env={'PATH': str(self.root)}, capture_output=True, check=True)
        self.assertIn(b'\x1etesttoken:INSTALL_EXIT:1\x1f', result.stdout)
        guest.sendall(result.stdout)
        with self.assertRaisesRegex(self.mod.SmokeError, r'Installer.*\[REDACTED\] refused') as caught:
            console.expect_installer(rb'Repeat password: ', 0.05, 'testtoken')
        self.assertNotIn('test-secret', str(caught.exception))

    def test_installer_followup_waits_for_exit_and_new_shell_prompt(self):
        console, guest = self.installer_console()
        premature = []
        def respond():
            guest.sendall(b'Installation completed. Diagnostic log: /run/installer.log\r\n')
            premature.append(bool(select.select([guest], [], [], 0.05)[0]))
            guest.sendall(b'\x1etesttoken:INSTALL_EXIT:0\x1f')
            premature.append(bool(select.select([guest], [], [], 0.05)[0]))
            guest.sendall(b'\x1b[?2004hhydra-live@hydra-os ~ $ ')
            data = b''
            while not data.endswith(b'\n'):
                data += guest.recv(65536)
            result = subprocess.run(['/bin/sh', '-c', data.decode()], capture_output=True)
            guest.sendall(result.stdout)
        worker = threading.Thread(target=respond, daemon=True)
        worker.start()
        console.expect_installer(rb'Installation completed\. Diagnostic log: [^\r\n]+',
                                 1, 'testtoken')
        console.finish_installer('testtoken', timeout=1)
        self.assertEqual(console.command('printf ready', timeout=1), b'ready')
        worker.join(timeout=1)
        self.assertEqual(premature, [False, False], 'command reached installer before shell was ready')

    def test_installer_completion_does_not_override_nonzero_return(self):
        console, guest = self.installer_console()
        guest.sendall(b'\x1etesttoken:INSTALL_EXIT:1\x1fhydra-live@hydra-os ~ $ ')
        with self.assertRaisesRegex(self.mod.SmokeError, 'Installer.*status 1'):
            console.finish_installer('testtoken', timeout=0.05)

    def shutdown_vm(self, program):
        one, two = socket.socketpair()
        vm = self.mod.VM.__new__(self.mod.VM)
        vm.console = self.mod.Console(one, self.root / 'shutdown.log', ['split-secret'])
        self.addCleanup(vm.console.close)
        code = ('import socket,sys,time; s=socket.socket(fileno=int(sys.argv[1])); ' + program)
        vm.process = subprocess.Popen([sys.executable, '-c', code, str(two.fileno())],
                                      pass_fds=(two.fileno(),), stdin=subprocess.DEVNULL)
        two.close()
        def reap():
            if vm.process.poll() is None:
                vm.process.terminate()
            vm.process.wait(timeout=2)
        self.addCleanup(reap)
        return vm

    def test_poweroff_drains_and_redacts_serial_until_owned_process_exits(self):
        vm = self.shutdown_vm("s.sendall(b'Stopping split-'); time.sleep(.02); "
                              "s.sendall(b'secret service\\nPower down\\n'); s.close()")
        vm.wait_poweroff(1)
        output = (self.root / 'shutdown.log').read_bytes()
        self.assertIn(b'Stopping [REDACTED] service\nPower down\n', output)
        self.assertNotIn(b'split-secret', output)

    def test_poweroff_preserves_failure_cause_and_original_timeout(self):
        for program, error in (("s.sendall(b'Stop job stuck\\n'); s.close(); time.sleep(1)",
                                'Guest failed to power off in time'),
                               ("s.sendall(b'QEMU shutdown failed\\n'); s.close(); sys.exit(7)",
                                'Test QEMU failed during poweroff')):
            with self.subTest(program=program):
                vm = self.shutdown_vm(program)
                started = time.monotonic()
                with self.assertRaisesRegex(self.mod.SmokeError, error):
                    vm.wait_poweroff(.15)
                self.assertLess(time.monotonic() - started, .5)
                output = (self.root / 'shutdown.log').read_bytes()
                self.assertIn(b'Stop job stuck' if 'time.sleep' in program else b'QEMU shutdown failed', output)
                if 'time.sleep' in program:
                    self.assertIsNone(vm.process.poll(), 'timeout must not kill or falsely pass the owned process')

    def test_frame_real_shell_roundtrip_does_not_accept_sentinel_in_echo(self):
        one, two = socket.socketpair()
        self.addCleanup(one.close)
        self.addCleanup(two.close)
        console = self.mod.Console(one, self.root / 'serial.log', [])
        self.addCleanup(console.close)
        def guest():
            data = b''
            while not data.endswith(b'\n'):
                data += two.recv(65536)
            two.sendall(data)
            result = subprocess.run(['/bin/sh', '-c', data.decode()], capture_output=True)
            two.sendall(result.stdout)
        thread = threading.Thread(target=guest)
        thread.start()
        self.assertEqual(console.command("printf 'persisted-data'", timeout=2), b'persisted-data')
        thread.join(timeout=2)

    def test_firmware_vars_must_be_private_copy_in_scratch(self):
        disk = self.root / 'disk.qcow2'
        self.mod.reserve_disk(disk)
        self.variables.unlink()
        self.variables.symlink_to(self.code)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.qemu_argv('qemu', self.root, disk, self.code,
                               self.variables, None, 2048)

    def test_drive_outside_scratch_and_ambiguous_qemu_paths_are_refused(self):
        disk = self.root / 'disk.qcow2'
        self.mod.reserve_disk(disk)
        other = self.root / 'other'
        other.mkdir()
        with self.assertRaises(self.mod.SmokeError):
            self.mod.qemu_argv('qemu', other, disk, self.code,
                               self.variables, None, 2048)
        comma = self.root / 'disk,cache=unsafe.qcow2'
        self.mod.reserve_disk(comma)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.qemu_argv('qemu', self.root, comma, self.code,
                               self.variables, None, 2048)

    def probe_fixture(self, case, live=False):
        # Run the production shell against ordinary scratch files. Commands that
        # query guest state are boundary fixtures; grep/find/test are real tools.
        import os
        root = self.root / 'guest'
        for directory in ('etc/hydra', 'etc/greetd', 'etc/sudoers.d',
                          'etc/systemd/system/getty@tty2.service.d',
                          'etc/systemd/system/serial-getty@ttyS0.service.d',
                          'usr/share/firmware', 'proc', 'sys/firmware/efi',
                          'run/initramfs/live/LiveOS'):
            (root / directory).mkdir(parents=True, exist_ok=True)
        (root / 'etc/greetd/config.toml').write_text('normal authentication')
        (root / 'usr/share/firmware/OVMF_CODE.fd').write_text('firmware')
        (root / 'proc/cmdline').write_text('root=UUID=disk ro' if case != 'live-cmdline' else 'root=live:CDLABEL=HYDRA_OS rd.live.image')
        if live or case == 'live-marker':
            (root / 'etc/hydra/live-mode').mkdir(exist_ok=True)
            (root / 'etc/hydra/live-mode/active').touch()
        if live:
            (root / 'run/initramfs/live/LiveOS/squashfs.img').touch()
        files = {
            'live-dropin': ('etc/systemd/system/getty@tty2.service.d/90-hydra-live.conf', 'live'),
            'live-sudoers': ('etc/sudoers.d/90-hydra-live', 'live'),
            'autologin': ('etc/systemd/system/serial-getty@ttyS0.service.d/other.conf', 'ExecStart=agetty --autologin hydratest'),
            'nopasswd': ('etc/sudoers.d/other', 'hydratest ALL=(ALL) NOPASSWD: ALL'),
            'live-greetd': ('etc/greetd/live.toml', 'live'),
        }
        if case in files:
            path, text = files[case]
            (root / path).write_text(text)
        if case == 'config-read-error':
            unreadable = root / 'etc/sudoers.d/unreadable'
            unreadable.write_text('configuration')
            unreadable.chmod(0)
        if case == 'cmdline-read-error':
            (root / 'proc/cmdline').unlink()
        commands = self.root / 'fixture-bin'
        commands.mkdir(exist_ok=True)
        dispatcher = commands / 'fixture'
        dispatcher.write_text('''#!/usr/bin/env python3
import os, pathlib, sys
name = pathlib.Path(sys.argv[0]).name
args = sys.argv[1:]
case = os.environ['SMOKE_CASE']
if name == 'id': print('hydra-live')
elif name == 'findmnt': print('/dev/vda2' if 'SOURCE' in args else ('overlay' if os.environ['SMOKE_LIVE']=='1' else 'ext4'))
elif name == 'systemctl':
    if args[0] == 'is-active':
        states = [unit != case for unit in args[1:]]
        print('\\n'.join('active' if state else 'failed' for state in states))
        sys.exit(0 if any(states) else 3)
    print('success' if 'Result' in args else '0')
elif name == 'getent':
    if args[:2] == ['passwd','hydra-live']:
        if case == 'account-lookup-error': sys.exit(3)
        if case != 'live-account': sys.exit(2)
        print('hydra-live:x:1000:1000::/home/hydra-live:/bin/bash')
    elif args[0] == 'shadow': print(args[1] + ':' + ('!' if args[1]=='root' else '$6$hash') + ':1::::::')
    else: print('127.0.0.1 STREAM example')
elif name == 'ip': print('10.203.0.1/24' if 'addr' in args else 'default via 10.0.2.2')
elif name == 'nmcli': print('connected')
else: print('fixture tool')
''')
        dispatcher.chmod(0o755)
        for command in ('id', 'findmnt', 'systemctl', 'getent', 'ip', 'nft',
                        'nmcli', 'sudo', 'hydra', 'hydra-install',
                        'qemu-system-x86_64', 'qemu-img', 'remote-viewer', 'foot', 'labwc'):
            path = commands / command
            if not path.exists():
                path.symlink_to(dispatcher)
        probe = self.mod.LIVE_CHECK if live else self.mod.INSTALLED_CHECK
        for path in ('/etc/', '/usr/share', '/proc/cmdline', '/sys/firmware/efi', '/run/initramfs/live/LiveOS/squashfs.img'):
            probe = probe.replace(path, str(root) + path)
        import shutil
        for command in ('python3', 'sh', 'grep', 'find', 'cut', 'readlink', 'base64'):
            target = shutil.which(command)
            self.assertIsNotNone(target)
            (commands / command).symlink_to(target) if not (commands / command).exists() else None
        env = dict(os.environ, PATH=str(commands),
                   SMOKE_CASE=case, SMOKE_LIVE='1' if live else '0')
        result = subprocess.run(['/bin/sh', '-c', self.mod.frame_command(probe, 'probecheck')],
                                env=env, capture_output=True, timeout=10)
        parsed = self.mod.parse_frame(result.stdout, 'probecheck')
        self.assertIsNotNone(parsed, result.stderr)
        return parsed[0]

    def test_installed_probe_rejects_each_retained_live_artifact(self):
        self.assertEqual(self.probe_fixture('clean'), 0)
        for case in ('live-cmdline', 'live-account', 'live-dropin', 'live-sudoers',
                     'autologin', 'nopasswd', 'live-marker', 'live-greetd'):
            with self.subTest(case=case):
                # Give each negative case an independent clean filesystem.
                import shutil
                shutil.rmtree(self.root / 'guest')
                self.assertNotEqual(self.probe_fixture(case), 0)

    def test_installed_probe_does_not_treat_account_query_error_as_absence(self):
        self.assertNotEqual(self.probe_fixture('account-lookup-error'), 0)

    def test_installed_probe_rejects_unreadable_configuration(self):
        self.assertNotEqual(self.probe_fixture('config-read-error'), 0)

    def test_installed_probe_rejects_unreadable_boot_arguments(self):
        self.assertNotEqual(self.probe_fixture('cmdline-read-error'), 0)

    def test_installed_probe_rejects_each_failed_required_service(self):
        self.assertEqual(self.probe_fixture('clean'), 0)
        for service in ('NetworkManager', 'greetd', 'hydra-network', 'hydra-dnsmasq'):
            with self.subTest(service=service):
                self.assertNotEqual(self.probe_fixture(service), 0)

    def test_live_probe_rejects_each_failed_required_service(self):
        self.assertEqual(self.probe_fixture('clean', live=True), 0)
        for service in ('NetworkManager', 'hydra-network', 'hydra-dnsmasq'):
            with self.subTest(service=service):
                self.assertNotEqual(self.probe_fixture(service, live=True), 0)

    def tcp_probe(self, fragments):
        # Execute the exact Python client embedded in the guest network probe,
        # redirecting only its address to a fresh loopback socket.
        import ast
        import time
        source = self.mod.NETWORK_CHECK.split("<<'NETWORK'\n", 1)[1].rsplit('\nNETWORK\n', 1)[0]
        assignments = (node for node in ast.walk(ast.parse(source)) if isinstance(node, ast.Assign))
        value = next(node.value for node in assignments
                     if any(isinstance(target, ast.Name) and target.id == 'client_code' for target in node.targets))
        client = ast.parse(ast.literal_eval(value))
        listener = socket.socket()
        self.addCleanup(listener.close)
        listener.bind(('127.0.0.1', 0))
        listener.listen(1)
        listener.settimeout(3)
        host, port = listener.getsockname()
        class Redirect(ast.NodeTransformer):
            def visit_Tuple(self, node):
                if isinstance(node.elts[0], ast.Constant) and node.elts[0].value == '10.203.0.250':
                    return ast.Tuple(elts=[ast.Constant(host), ast.Constant(port)], ctx=ast.Load())
                return self.generic_visit(node)
        client = ast.fix_missing_locations(Redirect().visit(client))
        def server():
            connection, _ = listener.accept()
            with connection:
                for fragment in fragments:
                    try:
                        connection.sendall(fragment)
                    except BrokenPipeError:
                        break
                    time.sleep(.05)
        thread = threading.Thread(target=server)
        thread.start()
        result = subprocess.run(['python3', '-c', ast.unparse(client)], capture_output=True, timeout=5)
        thread.join(timeout=3)
        self.assertFalse(thread.is_alive())
        return result

    def test_tcp_probe_accepts_complete_marker_across_fragmented_reads(self):
        result = self.tcp_probe([b'HYDRA_', b'LAN_TO_', b'VM_OK'])
        self.assertEqual(result.returncode, 0, result.stderr)

    def test_tcp_probe_rejects_truncated_marker(self):
        self.assertNotEqual(self.tcp_probe([b'HYDRA_LAN_TO_']).returncode, 0)

    def lifecycle_fixture(self):
        import json
        import os
        import uuid
        name = 'logout-test'
        runtime = self.root / 'private'
        run = runtime / name
        run.mkdir(parents=True, mode=0o700)
        runtime.chmod(0o700)
        audio = self.root / 'user-runtime'
        (audio / 'pulse').mkdir(parents=True)
        context = {'name': name, 'uuid': str(uuid.uuid4()), 'runtime': str(runtime),
                   'user_runtime': str(audio), 'uid': os.getuid()}
        process = subprocess.Popen(['python3', '-c', 'import time; time.sleep(30)',
                                    '-name', name, '-uuid', context['uuid']])
        self.addCleanup(lambda: process.wait(timeout=3))
        self.addCleanup(lambda: process.poll() is None and process.kill())
        (run / 'qemu.pid').write_text(str(process.pid))
        (run / 'identity.json').write_text(json.dumps({'name': name, 'uuid': context['uuid']}))
        listeners = []
        for path in (run / 'qmp.sock', run / 'spice.sock', audio / 'pipewire-0', audio / 'pulse/native'):
            listener = socket.socket(socket.AF_UNIX)
            listener.bind(str(path))
            listener.listen(5)
            listener.settimeout(.1)
            listeners.append(listener)
            self.addCleanup(listener.close)
        stopped = threading.Event()
        def qmp_server():
            while not stopped.is_set():
                try:
                    connection, _ = listeners[0].accept()
                except socket.timeout:
                    continue
                except OSError:
                    break
                with connection, connection.makefile('rwb', buffering=0) as stream:
                    stream.write(b'{"QMP": {}}\n')
                    for line in stream:
                        request = json.loads(line)
                        replies = {'query-name': {'name': context.get('qmp_name', name)},
                                   'query-uuid': {'UUID': context['uuid']},
                                   'query-status': {'status': 'running'},
                                   'query-kvm': {'enabled': True, 'present': True}}
                        if request['execute'] == 'query-kvm' and 'on_snapshot' in context:
                            context.pop('on_snapshot')()
                        stream.write(json.dumps({'return': replies.get(request['execute'], {}),
                                                 'id': request['id']}).encode() + b'\n')
        thread = threading.Thread(target=qmp_server)
        thread.start()
        self.addCleanup(lambda: thread.join(timeout=3))
        self.addCleanup(stopped.set)
        return context, process, run

    def test_logout_probe_detects_lost_private_socket(self):
        context, process, run = self.lifecycle_fixture()
        before = self.mod.lifecycle_snapshot(context)
        self.assertEqual(self.mod.lifecycle_snapshot(context), before)
        (run / 'spice.sock').unlink()
        with self.assertRaises(self.mod.SmokeError):
            self.mod.lifecycle_snapshot(context)

    def test_logout_probe_rejects_stale_metadata_and_foreign_qmp_identity(self):
        import json
        context, process, run = self.lifecycle_fixture()
        self.mod.lifecycle_snapshot(context)
        (run / 'identity.json').write_text(json.dumps({'name': context['name'], 'uuid': 'stale'}))
        with self.assertRaises(self.mod.SmokeError):
            self.mod.lifecycle_snapshot(context)
        (run / 'identity.json').write_text(json.dumps({'name': context['name'], 'uuid': context['uuid']}))
        context['qmp_name'] = 'foreign-process'
        with self.assertRaises(self.mod.SmokeError):
            self.mod.lifecycle_snapshot(context)

    def test_logout_probe_rejects_dead_process_and_changed_runtime_socket(self):
        context, process, run = self.lifecycle_fixture()
        before = self.mod.lifecycle_snapshot(context)
        audio = Path(context['user_runtime']) / 'pipewire-0'
        audio.unlink()
        replacement = socket.socket(socket.AF_UNIX)
        self.addCleanup(replacement.close)
        replacement.bind(str(audio))
        replacement.listen(1)
        after = self.mod.lifecycle_snapshot(context)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.verify_lifecycle_survival(before, after)
        process.terminate()
        process.wait(timeout=3)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.lifecycle_snapshot(context)

    def test_logout_probe_accepts_verified_same_runtime_and_rejects_process_restart(self):
        context, process, run = self.lifecycle_fixture()
        before = self.mod.lifecycle_snapshot(context)
        self.mod.verify_lifecycle_survival(before, self.mod.lifecycle_snapshot(context))
        process.terminate()
        process.wait(timeout=3)
        replacement = subprocess.Popen(['python3', '-c', 'import time; time.sleep(30)',
                                        '-name', context['name'], '-uuid', context['uuid']])
        self.addCleanup(lambda: replacement.wait(timeout=3))
        self.addCleanup(lambda: replacement.poll() is None and replacement.kill())
        (run / 'qemu.pid').write_text(str(replacement.pid))
        changed = self.mod.lifecycle_snapshot(context)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.verify_lifecycle_survival(before, changed)

    def test_large_guest_probe_survives_serial_tty_canonical_line_limit(self):
        import os
        import pty
        import termios
        master, slave = pty.openpty()
        self.addCleanup(os.close, master)
        self.addCleanup(os.close, slave)
        options = termios.tcgetattr(slave)
        options[3] &= ~termios.ECHO
        termios.tcsetattr(slave, termios.TCSANOW, options)
        process = subprocess.Popen(['/bin/sh'], stdin=slave, stdout=subprocess.PIPE,
                                   stderr=subprocess.PIPE)
        self.addCleanup(process.stdout.close)
        self.addCleanup(process.stderr.close)
        self.addCleanup(lambda: process.wait(timeout=3))
        self.addCleanup(lambda: process.poll() is None and process.kill())
        payload = 'guest-proof-' * 1200
        command = self.mod.frame_command('printf %s ' + payload, 'longprobe')
        os.write(master, (command + '\nexit\n').encode())
        output, error = process.communicate(timeout=3)
        self.assertEqual(self.mod.parse_frame(output, 'longprobe'), (0, payload.encode()), error)

    def test_generated_guest_lifecycle_probe_compiles(self):
        compile(self.mod.lifecycle_guest_script(), '<guest-lifecycle-probe>', 'exec')

    def session_fixture(self, records):
        import json
        import os
        from unittest.mock import patch
        source = self.root / 'session-records.json'
        source.write_text(json.dumps(records))
        commands = self.root / 'session-fixture-bin'
        commands.mkdir()
        command = commands / 'loginctl'
        command.write_text('''#!/usr/bin/env python3
import json, os, sys
records = json.load(open(os.environ['SMOKE_SESSION_RECORDS']))
args = sys.argv[1:]
if args[0] == 'show-user':
    print(' '.join(record['Id'] for record in records if str(record['User']) == args[1]))
elif args[0] == 'show-session':
    record = next((record for record in records if record['Id'] == args[1]), None)
    if record is None: sys.exit(1)
    for key, value in record.items(): print(key + '=' + str(value))
else: sys.exit(1)
''')
        command.chmod(0o755)
        environment = patch.dict(os.environ, {'PATH': str(commands) + ':' + os.environ['PATH'],
                                              'SMOKE_SESSION_RECORDS': str(source)})
        environment.start()
        self.addCleanup(environment.stop)
        return source

    def session_record(self, ident='serial1', state='active', cls='user', leader=1234):
        import os
        return {'Id': ident, 'User': os.getuid(), 'State': state, 'Class': cls,
                'Leader': leader, 'TTY': 'ttyS0' if cls == 'user' else ''}

    def test_logout_sessions_accept_closing_scope_and_manager_with_surviving_vm(self):
        context, process, run = self.lifecycle_fixture()
        original = self.session_record()
        context['login_session'] = original
        context['before'] = self.mod.lifecycle_snapshot(context)
        self.session_fixture([dict(original, State='closing'),
                              self.session_record('manager1', 'active', 'manager')])
        self.assertTrue(self.mod.no_open_logins(context))
        self.assertEqual(self.mod.capture_logout_snapshot(context), context['before'])

    def test_logout_sessions_initial_login_ignores_manager_but_rejects_open_replacement(self):
        import json
        import os
        original = self.session_record()
        context = {'uid': os.getuid(), 'login_session': original}
        source = self.session_fixture([original, self.session_record('manager1', 'active', 'manager')])
        self.assertEqual(self.mod.require_initial_login(os.getuid(), 'serial1'), original)
        for state in ('online', 'active'):
            with self.subTest(state=state):
                source.write_text(json.dumps([dict(original, State='closing'),
                                             self.session_record('new-login', state)]))
                self.assertFalse(self.mod.no_open_logins(context))
        source.write_text(json.dumps([dict(original, State='closing', Leader=9999)]))
        with self.assertRaises(self.mod.SmokeError):
            self.mod.no_open_logins(context)

    def test_logout_sessions_reject_login_appearing_during_snapshot(self):
        import json
        context, process, run = self.lifecycle_fixture()
        original = self.session_record()
        context['login_session'] = original
        context['before'] = self.mod.lifecycle_snapshot(context)
        source = self.session_fixture([dict(original, State='closing')])
        context['on_snapshot'] = lambda: source.write_text(json.dumps([
            dict(original, State='closing'), self.session_record('relogin')]))
        self.assertTrue(self.mod.no_open_logins(context))
        with self.assertRaises(self.mod.SmokeError):
            self.mod.capture_logout_snapshot(context)

    def test_guest_tools_accept_gentoo_remote_viewer_without_virt_viewer(self):
        self.assertEqual(self.probe_fixture('clean'), 0)
        self.assertEqual(self.probe_fixture('clean', live=True), 0)


    def test_terminal_ux_fixture_has_complete_iso_volume_and_nonboot_directory(self):
        self.assertTrue(hasattr(self.mod, 'terminal_ux_iso'), 'Installed UX ISO fixture is missing')
        from hydra.media import validate_iso, MediaError
        iso = self.root / 'ux.iso'
        data = self.mod.terminal_ux_iso()
        iso.write_bytes(data)
        self.assertEqual(validate_iso(iso), iso)
        self.assertEqual(len(data), 21 * 2048)
        self.assertEqual(data[16 * 2048:16 * 2048 + 7], b'\x01CD001\x01')
        self.assertEqual(data[17 * 2048:17 * 2048 + 7], b'\xffCD001\x01')
        self.assertEqual(data[20 * 2048 + 25], 2, 'Root directory must be a directory record')
        self.assertNotIn(b'EL TORITO SPECIFICATION', data, 'Fixture must not imply an OS boot')
        iso.write_bytes(data[:-2048])
        with self.assertRaises(MediaError):
            validate_iso(iso)

    def test_terminal_ux_branding_verifies_packaged_art_with_colors_and_side_data(self):
        logo = '$1  @@@   @@@   @@@\n    %%%%%\n\n$2 H Y D R A  O S\n'
        rendered = ('  @@@   @@@   @@@   hydratest@hydra-os\n'
                    '    %%%%%             OS: Hydra OS x86_64\n'
                    '                      Kernel: Linux\n'
                    ' H Y D R A  O S       Uptime: 1 minute\n')
        actual = self.mod.verify_terminal_ux_branding(
            '\x1b[36m' + rendered + '\x1b[0m', '', logo)
        self.assertEqual(actual, rendered)

    def test_terminal_ux_branding_rejects_incomplete_or_wrong_art_and_render_errors(self):
        logo = '$1  @@@\n  %%%\n  %%%\n$2 H Y D R A  O S\n'
        rendered = '  @@@\n  %%%\n  %%%\n H Y D R A  O S\nOS: Hydra OS x86_64\n'
        for output, error in ((rendered.replace('OS: Hydra OS', 'OS: Gentoo'), ''),
                              (rendered.replace('  @@@\n', ''), ''),
                              (rendered.replace('  @@@', '  @@@@'), ''),
                              (rendered.replace('  @@@', '  @@@ xx'), ''),
                              (rendered.replace('  %%%\n', '', 1), ''),
                              (rendered.replace('  @@@\n  %%%', '  %%%\n  @@@'), ''),
                              (rendered.replace('H Y D R A  O S', 'OTHER OS'), ''),
                              ('H Y D R A  O S\nOS: Hydra OS x86_64\n', ''),
                              (rendered, 'Unknown JSON key: invalid'),
                              (rendered + 'Memory: Error loading module\n', '')):
            with self.subTest(output=output, error=error):
                with self.assertRaises(self.mod.SmokeError):
                    self.mod.verify_terminal_ux_branding(output, error, logo)

    def test_terminal_ux_branding_requires_nonblank_packaged_art_and_caption(self):
        rendered = '  @@@\n H Y D R A  O S\nOS: Hydra OS x86_64\n'
        for logo in ('', ' \n', '$2 H Y D R A  O S\n', '$1  @@@\n'):
            with self.subTest(logo=logo):
                with self.assertRaises(self.mod.SmokeError):
                    self.mod.verify_terminal_ux_branding(rendered, '', logo)

    def test_terminal_ux_snapshot_checks_live_qmp_identity_and_same_process(self):
        self.assertTrue(hasattr(self.mod, 'terminal_ux_snapshot'), 'Installed UX identity verification is missing')
        context, process, run = self.lifecycle_fixture()
        before = self.mod.terminal_ux_snapshot(context)
        self.assertEqual(before['pid'], process.pid)
        self.assertEqual(before['uuid'], context['uuid'])
        self.assertEqual(self.mod.terminal_ux_snapshot(context), before)
        context['qmp_name'] = 'foreign-process'
        with self.assertRaises(self.mod.SmokeError):
            self.mod.terminal_ux_snapshot(context)
        context.pop('qmp_name')
        process.terminate(); process.wait(timeout=3)
        with self.assertRaises(self.mod.SmokeError):
            self.mod.terminal_ux_snapshot(context)

    def test_installed_terminal_ux_script_compiles_as_standalone_guest_probe(self):
        self.assertTrue(hasattr(self.mod, 'terminal_ux_guest_script'), 'Installed terminal UX probe is missing')
        compile(self.mod.terminal_ux_guest_script(), '<guest-terminal-ux>', 'exec')