#!/usr/bin/python3 -cimport os, sys; os.execv(os.path.dirname(sys.argv[1]) + "/pywrap", sys.argv)

import binascii
import errno
import glob
import importlib.machinery
import importlib.util
import logging
import os
import socket
import string
import subprocess
import sys
import tempfile
import time
import unittest
from collections.abc import Collection, Sequence
from dataclasses import dataclass
from typing import IO

import testlib
from lcov import create_coverage_report, prepare_for_code_coverage
from lib.constants import DEFAULT_MACHINE_MEMORY_MB
from machine import testvm

os.environ["PYTHONUNBUFFERED"] = "1"

# Amount of times a test is re-run to find flakes / race conditions
AMPLIFY_TEST_COUNT = 10

# Memory usage constants; measured 2026-01 on Fedora 43 x86_64 with Chromium 143 and Firefox 146
BROWSER_MEMORY_MB = 550  # Incremental per process (Firefox: 470 MB, Chromium: 319 MB; + margin)
# browser code/libs shared memory (285 MB measured), and leave some breathing room for OS/buffers
SYSTEM_RESERVE_GB = 1.0


def get_available_memory_gb() -> float:
    # Format: "MemAvailable:    12345678 kB"
    with open('/proc/meminfo', 'r') as f:
        for line in f:
            if line.startswith('MemAvailable:'):
                return int(line.split()[1]) / (1024 * 1024)
    raise RuntimeError("MemAvailable not found in /proc/meminfo")


@dataclass
class CliOpts(testlib.TestlibArgs):
    amplify: str | None
    base: str
    browser: str | None
    debug: bool
    exclude: Sequence[str]
    machine: str | None
    no_retry_fail: bool
    nondestructive: bool
    nondestructive_cpus: int
    nondestructive_memory_mb: int
    capacity_factor: float
    test_dir: str
    test_glob: str
    thorough: bool
    track_naughties: bool


def flush_stdout() -> None:
    while True:
        try:
            sys.stdout.flush()
            break
        except BlockingIOError:
            time.sleep(0.1)


class Test:
    def __init__(
        self,
        test_id: int,
        *,
        command: Sequence[str],
        timeout: float,
        nondestructive: bool,
        retry_when_affected: bool,
        todo: str | None,
        ram_gb: float,
    ) -> None:
        self.process: subprocess.Popen[bytes] | None = None
        self.retries = 0
        self.test_id = test_id
        self.command = list(command)
        self.timeout = timeout
        self.nondestructive = nondestructive
        self.machine_id: int | None = None
        self.retry_when_affected = retry_when_affected
        self.todo = todo
        self.ram_gb = ram_gb
        self.returncode: int | None = None

    def assign_machine(self, machine_id: int, ssh_address: str, web_address: str) -> None:
        assert self.nondestructive, "assigning a machine only works for nondestructive test"
        self.machine_id = machine_id
        self.command.insert(-2, "--machine")
        self.command.insert(-2, ssh_address)
        self.command.insert(-2, "--browser")
        self.command.insert(-2, web_address)

    def start(self) -> None:
        if self.nondestructive:
            assert self.machine_id is not None, (
                f"need to assign nondestructive test {self} {self.command} to a machine"
            )
        self.outfile: IO[bytes] | None = tempfile.TemporaryFile()
        self.process = subprocess.Popen(
            ["timeout", "-v", str(self.timeout), *self.command], stdout=self.outfile, stderr=subprocess.STDOUT
        )

    def poll(self) -> int | None:
        assert self.process is not None

        poll_result = self.process.poll()
        if poll_result is not None:
            assert self.outfile is not None

            self.outfile.flush()
            self.outfile.seek(0)
            self.output = self.outfile.read()
            self.outfile.close()
            self.outfile = None
            self.returncode = self.process.returncode

        return poll_result

    def finish(self, affected_tests: list[str], opts: CliOpts) -> tuple[str | None, int]:
        """Returns if a test should retry or not

        Call test-failure-policy on the test's output, print if needed.

        Return (retry_reason, exit_code). retry_reason can be None or a string.
        """

        print_tap = not opts.list
        affected = any(self.command[0].endswith(t) for t in affected_tests)
        retry_reason = ""

        # Try affected tests 3 times
        if self.returncode == 0 and affected and self.retry_when_affected and self.retries < 2:
            retry_reason = "test affected tests 3 times"
            self.retries += 1
            self._print_test(print_tap=print_tap, retry_reason=f"# RETRY {self.retries} ({retry_reason})")
            return retry_reason, 0

        # If test is being skipped pick up the reason
        if self.returncode == 77:
            lines = self.output.splitlines()
            skip_reason = lines[-1].strip().decode()
            self.output = b"\n".join(lines[:-1])
            self._print_test(print_tap=print_tap, skip_reason=skip_reason)
            return None, 0

        # If the test was marked with @todo then...
        if self.todo is not None:
            if self.returncode == 0:
                # The test passed, but it shouldn't have.
                self.returncode = 1  # that's a fail
                self._print_test(print_tap=print_tap, todo_reason=f"# expected failure: {self.todo}")
                return None, 1
            else:
                # The test failed as expected
                # Outputs  'not ok 1 test # TODO ...'
                self._print_test(print_tap=print_tap, todo_reason=f"# TODO {self.todo}")
                return None, 0

        if self.returncode == 0:
            self._print_test(print_tap=print_tap)
            return None, 0

        if not opts.thorough:
            cmd = ["test-failure-policy", "--all"]
            if not opts.track_naughties:
                cmd.append("--offline")
            cmd.append(testvm.DEFAULT_IMAGE)
            try:
                proc = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
                reason = proc.communicate(self.output + ("not ok " + str(self)).encode())[0].strip()

                if proc.returncode == 77:
                    self.returncode = proc.returncode
                    self._print_test(skip_reason=f"# SKIP {reason.decode()}")
                    return None, 0

                if proc.returncode == 78:
                    self.returncode = proc.returncode
                    self._print_test(skip_reason=f"# NOTE {reason.decode()}")
                    return None, 1

                if proc.returncode == 1:
                    retry_reason = reason.decode()

            except OSError as ex:
                if ex.errno != errno.ENOENT:
                    sys.stderr.write(f"\nCouldn't run test-failure-policy: {ex!s}\n")

        # Always retry test harness failures
        if retry_reason and "test harness" in retry_reason:
            self.retries += 1
            self._print_test(retry_reason=f"# RETRY {self.retries} ({retry_reason})")
            return retry_reason, 0

        # HACK: many tests are unstable, always retry them 3 times unless affected
        if not affected and not retry_reason and not opts.no_retry_fail:
            retry_reason = "be robust against unstable tests"

        has_unexpected_message = testlib.UNEXPECTED_MESSAGE.encode() in self.output
        has_pixel_test_message = testlib.PIXEL_TEST_MESSAGE.encode() in self.output
        if self.retries < 2 and not (has_unexpected_message or has_pixel_test_message) and retry_reason:
            self.retries += 1
            self._print_test(retry_reason=f"# RETRY {self.retries} ({retry_reason})")
            return retry_reason, 0

        self.output += b"\n"
        self._print_test()
        self.machine_id = None
        return None, 1

    # internal methods

    def __str__(self) -> str:
        ram = "" if self.nondestructive else f" ({self.ram_gb:.1f}GB)"
        nd = f" [ND@{self.machine_id}]" if self.nondestructive else ""
        return f"{self.test_id} {self.command[0]} {self.command[-1]}{ram}{nd}"

    def _print_test(
        self, *, print_tap: bool = True, retry_reason: str = "", skip_reason: str = "", todo_reason: str = ""
    ) -> None:
        def write_line(line: bytes) -> None:
            while line:
                try:
                    sys.stdout.buffer.write(line)
                    break
                except BlockingIOError as e:
                    line = line[e.characters_written :]
                    time.sleep(0.1)

        # be quiet in TAP mode for successful tests
        lines = self.output.strip().splitlines(keepends=True)
        if print_tap and self.returncode == 0 and len(lines) > 0:
            for line in lines[:-1]:
                if line.startswith(b"WARNING:"):
                    write_line(line)
            write_line(lines[-1])
        else:
            for line in lines:
                write_line(line)

        if retry_reason:
            retry_reason = " " + retry_reason
        if skip_reason:
            skip_reason = " " + skip_reason
        if todo_reason:
            todo_reason = " " + todo_reason

        if not print_tap:
            print(retry_reason + skip_reason + todo_reason)
            flush_stdout()
            return

        print()  # Tap needs to start on a separate line
        status = "ok" if self.returncode in [0, 77] else "not ok"
        print(f"{status} {self}{retry_reason}{skip_reason}{todo_reason}")
        flush_stdout()


class GlobalMachine:
    def __init__(
        self,
        *,
        restrict: bool = True,
        cpus: int | None = None,
        memory_mb: int,
        machine_class: type[testvm.VirtMachine] = testvm.VirtMachine,
    ):
        self.image = testvm.DEFAULT_IMAGE
        self.network = testvm.VirtNetwork(image=self.image)
        self.networking = self.network.host(restrict=restrict)
        self.machine: testvm.VirtMachine | None = machine_class(
            verbose=True, networking=self.networking, image=self.image, cpus=cpus, memory_mb=memory_mb
        )
        self.machine_class = machine_class
        if not os.path.exists(self.machine.image_file):
            self.machine.pull(self.machine.image_file)
        self.machine.start()
        self.start_time = time.time()
        self.duration: int | None = None
        self.ssh_address: str | None = f"{self.machine.ssh_address}:{self.machine.ssh_port}"
        self.web_address: str | None = f"{self.machine.web_address}:{self.machine.web_port}"
        self.running_test: Test | None = None

    def reset(self) -> None:
        # It is important to re-use self.networking here, so that the
        # machine keeps its browser and control port.
        assert self.machine is not None
        self.machine.kill()
        self.machine = self.machine_class(verbose=True, networking=self.networking, image=self.image)
        self.machine.start()

    def kill(self) -> None:
        assert self.running_test is None, "can't kill global machine with running test"
        assert self.machine is not None
        self.machine.kill()
        self.network.kill()
        self.duration = round(time.time() - self.start_time)
        self.machine = None
        self.ssh_address = None
        self.web_address = None

    def is_available(self) -> bool:
        return self.machine is not None and self.running_test is None


def check_valid(filename: str) -> str | None:
    name = os.path.basename(filename)
    allowed = string.ascii_letters + string.digits + "-_"
    if not all(c in allowed for c in name):
        return None
    return name.replace("-", "_")


def build_command(filename: str, test: str, opts: CliOpts) -> Sequence[str]:
    cmd = [filename]
    if opts.trace:
        cmd.append("-t")
    if opts.verbosity:
        cmd.append("-v")
    if not opts.fetch:
        cmd.append("--nonet")
    if opts.list:
        cmd.append("-l")
    if opts.coverage:
        cmd.append("--coverage")
    cmd.append(test)
    return cmd


def get_affected_tests(test_dir: str, base_branch: str, test_files: Collection[str]) -> list[str]:
    if not base_branch:
        return []

    changed_tests = []

    # Detect affected tests from changed test files
    diff_out = subprocess.check_output(["git", "diff", "--name-only", "origin/" + base_branch, test_dir])
    # Never consider 'test/verify/check-example' to be affected - our tests for tests count on that
    # This file provides only examples, there is no place for it being flaky, no need to retry
    changed_tests = [test.decode() for test in diff_out.strip().splitlines() if not test.endswith(b"check-example")]

    # If more than 3 test files were changed don't consider any of them as affected
    # as it might be a PR that changes more unrelated things.
    if len(changed_tests) > 3:
        # If 'test/verify/check-testlib' is affected, keep just that one - our tests for tests count on that
        if "test/verify/check-testlib" in changed_tests:
            changed_tests = ["test/verify/check-testlib"]
        else:
            changed_tests = []

    # Detect affected tests from changed pkg/* subdirectories in cockpit
    # If affected tests get detected from pkg/* changes, don't apply the
    # "only do this for max. 3 check-* changes" (even if the PR also changes ≥ 3 check-*)
    # (this does not apply to other projects)
    diff_out = subprocess.check_output(["git", "diff", "--name-only", "origin/" + base_branch, "--", "pkg/"])

    # Drop changes in css files - this does not affect tests thus no reason to retry
    files = [f.decode() for f in diff_out.strip().splitlines() if not f.endswith(b"css")]

    changed_pkgs = {"check-" + pkg.split("/")[1] for pkg in files}
    changed_tests.extend([test for test in test_files if any(pkg in test for pkg in changed_pkgs)])

    return changed_tests


def detect_tests(
    test_files: Collection[str], image: str, opts: CliOpts
) -> tuple[list[Test], list[Test], type[testvm.VirtMachine] | None]:
    """Detect tests to be run

    Builds the list of tests we'll run in separate machines (destructive tests)
    and the ones we can run on the same machine (nondestructive)
    """

    destructive_tests: list[Test] = []
    nondestructive_tests: list[Test] = []
    seen_classes: dict[str, str] = {}
    machine_class = None
    test_id = 1

    for filename in test_files:
        name = check_valid(filename)
        if not name or not os.path.isfile(filename):
            continue
        loader = importlib.machinery.SourceFileLoader(name, filename)
        spec = importlib.util.spec_from_loader(loader.name, loader)
        assert spec is not None
        module = importlib.util.module_from_spec(spec)
        loader.exec_module(module)
        for test_suite in unittest.TestLoader().loadTestsFromModule(module):
            assert isinstance(test_suite, unittest.TestSuite)
            for test in test_suite:
                assert isinstance(test, unittest.TestCase)
                if isinstance(test, testlib.MachineCase) and test.machine_class is not None:
                    if machine_class is not None and machine_class != test.machine_class:
                        raise ValueError(
                            f"only one unique machine_class can be used per project, provided with {machine_class} and {test.machine_class}"
                        )

                    machine_class = test.machine_class

                # ensure that test classes are unique, so that they can be selected properly
                cls = test.__class__.__name__
                if seen_classes.get(cls) not in [None, filename]:
                    raise ValueError("test class %s in %s already defined in %s" % (cls, filename, seen_classes[cls]))
                seen_classes[cls] = filename

                test_method = getattr(test.__class__, test._testMethodName)
                test_str = f"{cls}.{test._testMethodName}"
                # most tests should take much less than 10mins, so default to that;
                # longer tests can be annotated with @timeout(seconds)
                # check the test function first, fall back to the class'es timeout
                if opts.tests and not any(t in test_str for t in opts.tests):
                    continue
                if test_str in opts.exclude:
                    continue
                test_timeout = testlib.get_decorator(test_method, test, "timeout", 600)
                nd = testlib.get_decorator(test_method, test, "nondestructive")
                rwa = not testlib.get_decorator(test_method, test, "no_retry_when_changed")
                todo = testlib.get_decorator(test_method, test, "todo")

                # Calculate test's RAM requirement (VM memory + browser)
                if nd:
                    total_vm_memory_mb = opts.nondestructive_memory_mb
                else:
                    provision = getattr(test.__class__, "provision", None) or {"machine": {}}
                    total_vm_memory_mb = sum(
                        config.get("memory_mb") or DEFAULT_MACHINE_MEMORY_MB
                        for config in provision.values()
                    )
                ram_gb = (total_vm_memory_mb + BROWSER_MEMORY_MB) / 1024.0

                tst = Test(
                    test_id,
                    command=build_command(filename, test_str, opts),
                    timeout=test_timeout,
                    nondestructive=nd,
                    retry_when_affected=rwa,
                    todo=todo,
                    ram_gb=ram_gb,
                )
                if nd:
                    for _ in range(AMPLIFY_TEST_COUNT if opts.amplify == test_str else 1):
                        nondestructive_tests.append(tst)
                else:
                    if not opts.nondestructive:
                        for _ in range(AMPLIFY_TEST_COUNT if opts.amplify == test_str else 1):
                            destructive_tests.append(tst)
                test_id += 1

    # sort non destructive tests by class/test name, to avoid spurious errors where failures depend on the order of
    # execution but let's make sure we always test them both ways around; hash the image name, which is
    # robust, reproducible, and provides an even distribution of both directions
    nondestructive_tests.sort(key=lambda t: t.command[-1], reverse=bool(binascii.crc32(image.encode()) & 1))

    return (nondestructive_tests, destructive_tests, machine_class)


def list_tests(opts: CliOpts) -> None:
    test_files = glob.glob(os.path.join(opts.test_dir, opts.test_glob))
    nondestructive_tests, destructive_tests, _ = detect_tests(test_files, "dummy", opts)
    names = {t.command[-1] for t in nondestructive_tests + destructive_tests}
    for n in sorted(names):
        print(n)


def run(opts: CliOpts, image: str) -> int:
    fail_count = 0
    start_time = time.time()

    if opts.coverage:
        prepare_for_code_coverage()

    test_files = glob.glob(os.path.join(opts.test_dir, opts.test_glob))
    changed_tests = get_affected_tests(opts.test_dir, opts.base, test_files)
    nondestructive_tests, destructive_tests, machine_class = detect_tests(test_files, image, opts)
    nondestructive_tests_len = len(nondestructive_tests)
    destructive_tests_len = len(destructive_tests)

    if opts.machine:
        assert not destructive_tests

    print(f"1..{nondestructive_tests_len + destructive_tests_len}")
    flush_stdout()

    running_tests: list[Test] = []
    global_machines: list[GlobalMachine] = []
    test_slots: int = 0  # how many tests can we run in parallel

    if not opts.machine:
        # Create appropriate number of nondestructive machines; prioritize the nondestructive tests, to get
        # them out of the way as fast as possible, then let the destructive ones start as soon as
        # a given nondestructive runner is done. Limit by available RAM and CPU.
        available_ram_gb = get_available_memory_gb() - SYSTEM_RESERVE_GB
        global_machine_ram_gb = (opts.nondestructive_memory_mb + BROWSER_MEMORY_MB) / 1024.0
        max_global_by_ram = int(available_ram_gb / global_machine_ram_gb)
        if max_global_by_ram == 0:
            sys.exit(f"Need {global_machine_ram_gb:.1f} GB per test, but only {available_ram_gb:.1f} GB available")

        max_global_by_cpu = max((os.cpu_count() or 0) // 2, 1)
        test_slots = int(min(max_global_by_ram, max_global_by_cpu) * opts.capacity_factor)

        num_global = min(nondestructive_tests_len, test_slots)
        logging.debug("ND capacity: %.1f GB available, %.1f GB/slot, "
                      "max %d by RAM, max %d by CPU, factor %f, %d tests → starting %d slots",
                      available_ram_gb, global_machine_ram_gb,
                      max_global_by_ram, max_global_by_cpu, opts.capacity_factor,
                      nondestructive_tests_len, num_global)

        for _ in range(num_global):
            global_machines.append(
                GlobalMachine(
                    restrict=not opts.enable_network,
                    cpus=opts.nondestructive_cpus,
                    memory_mb=opts.nondestructive_memory_mb,
                    machine_class=machine_class or testvm.VirtMachine,
                )
            )

    # test scheduling loop
    while True:
        made_progress = False

        # mop up finished tests
        logging.debug("test loop: %d running tests", len(running_tests))
        for test in running_tests.copy():
            poll_result = test.poll()
            if poll_result is not None:
                made_progress = True
                running_tests.remove(test)
                test_machine = test.machine_id  # test_finish() resets it
                retry_reason, test_result = test.finish(changed_tests, opts)
                fail_count += test_result
                logging.debug("test %s finished; result %s retry reason %s", test, test_result, retry_reason)

                if test_machine is not None and not opts.machine:
                    # unassign from global machine
                    global_machines[test_machine].running_test = None

                    # sometimes our global machine gets messed up; also, tests that time out don't run cleanup handlers
                    # restart it to avoid an unbounded number of test retries and follow-up errors
                    if poll_result == 124 or (retry_reason and "test harness" in retry_reason):
                        # try hard to keep the test output consistent
                        sys.stderr.write("\nRestarting global machine %s\n" % test_machine)
                        sys.stderr.flush()
                        global_machines[test_machine].reset()

                # run again if needed
                if retry_reason:
                    if test.nondestructive:
                        nondestructive_tests.insert(0, test)
                    else:
                        destructive_tests.insert(0, test)

        if opts.machine and opts.browser:
            if not running_tests and nondestructive_tests:
                test = nondestructive_tests.pop(0)
                logging.debug("Static machine is free, assigning next test %s", test)
                test.assign_machine(-1, opts.machine, opts.browser)
                test.start()
                running_tests.append(test)
                made_progress = True
        else:
            # find free global machines, and either assign a new non destructive test, or kill them to free resources
            for idx, machine in enumerate(global_machines):
                if machine.is_available():
                    if nondestructive_tests:
                        test = nondestructive_tests.pop(0)
                        logging.debug("Global machine %s is free, assigning next test %s", idx, test)
                        machine.running_test = test
                        assert machine.ssh_address is not None
                        assert machine.web_address is not None
                        test.assign_machine(idx, machine.ssh_address, machine.web_address)
                        test.start()
                        running_tests.append(test)
                    else:
                        logging.debug("Global machine %s is free, and no more non destructive tests; killing", idx)
                        machine.kill()

                    made_progress = True

        # Schedule destructive tests if we have enough RAM, and also don't exceed the parallelism capacity
        running_destructive_tests = len([t for t in running_tests if not t.nondestructive])
        available_ram_gb = get_available_memory_gb() - SYSTEM_RESERVE_GB

        # Start destructive tests one at a time to avoid VM boot storms
        if destructive_tests:
            next_test = destructive_tests[0]

            # Check if we have a free slot
            running_global_machines = len([m for m in global_machines if m.machine is not None])
            assert test_slots
            max_destructive = test_slots - running_global_machines
            if running_destructive_tests >= max_destructive:
                logging.debug("NOT starting %s: no free slots (max %d), already running %d destructive and %d global ND machines",
                              next_test, max_destructive, running_destructive_tests, running_global_machines)
            # Check available RAM
            elif next_test.ram_gb > available_ram_gb:
                logging.debug("NOT starting %s: insufficient RAM (needs %.1f GB, only %.1f GB available)",
                              next_test, next_test.ram_gb, available_ram_gb)
            else:
                test = destructive_tests.pop(0)
                logging.debug("starting %s", test)
                test.start()
                running_tests.append(test)
                made_progress = True
                # Avoid VM boot storms; unreliable especially with nested KVM. This should be enough time to let VMs boot
                time.sleep(15)

        # are we done?
        if not running_tests:
            assert not nondestructive_tests, (
                f"nondestructive_tests should be empty: {[str(t) for t in nondestructive_tests]}"
            )
            assert not destructive_tests, f"destructive_tests should be empty: {[str(t) for t in destructive_tests]}"
            break

        # Sleep if we didn't make progress, give running tests some breathing room
        if not made_progress:
            time.sleep(5)

    # Create coverage report
    if opts.coverage:
        create_coverage_report()

    # print summary
    duration = int(time.time() - start_time)
    hostname = socket.gethostname().split(".")[0]

    nondestructive_details: list[str] = []
    if not opts.machine:
        for idx, machine in enumerate(global_machines):
            nondestructive_details.append(f"{idx}: {machine.duration}s")

    details = f"[{duration}s on {hostname}, {destructive_tests_len} destructive tests, {nondestructive_tests_len} nondestructive tests: {', '.join(nondestructive_details)}]"
    print()
    if fail_count > 0:
        print(f"# {fail_count} TESTS FAILED {details}")
    else:
        print(f"# TESTS PASSED {details}")
    flush_stdout()

    return fail_count


def main() -> int:
    parser = testlib.arg_parser(enable_sit=False)
    parser.add_argument("--debug", action="store_true", help="Enable verbose debug logging")
    parser.add_argument("--thorough", action="store_true", help="Thorough mode, no skipping known issues")
    parser.add_argument("-n", "--nondestructive", action="store_true", help="Only consider @nondestructive tests")
    parser.add_argument(
        "--machine",
        metavar="hostname[:port]",
        default=None,
        help="Run tests against an already running machine;  implies --nondestructive",
    )
    parser.add_argument(
        "--browser",
        metavar="hostname[:port]",
        default=None,
        help="When using --machine, use this cockpit web address",
    )
    parser.add_argument(
        "--test-dir",
        default=os.environ.get("TEST_DIR", testvm.TEST_DIR),
        help="Directory in which to glob for test files; default: %(default)s",
    )
    parser.add_argument(
        "--test-glob",
        default="check-*",
        help="Pattern with which to glob in the test directory; default: %(default)s",
    )
    parser.add_argument(
        "--exclude",
        action="append",
        default=[],
        metavar="TestClass.testName",
        help="Exclude test (exact match only); can be specified multiple times",
    )
    parser.add_argument(
        "--nondestructive-cpus", type=int, default=None, help="Number of CPUs for nondestructive test global machines"
    )
    parser.add_argument(
        "--nondestructive-memory-mb", type=int, default=DEFAULT_MACHINE_MEMORY_MB,
        help="RAM size for nondestructive test global machines (default: %(default)s MB)",
    )
    parser.add_argument(
        "--capacity-factor", type=float, default=1.0,
        help="Multiply the detected capacity for running tests in parallel with this number (default: %(default)s)",
    )
    parser.add_argument(
        "--base",
        default=os.environ.get("BASE_BRANCH"),
        help="Retry affected tests compared to given base branch; default: %(default)s",
    )
    parser.add_argument(
        "--track-naughties", action="store_true", help="Update the occurrence of naughties on cockpit-project/bots"
    )
    parser.add_argument("--no-retry-fail", action="store_true", help="Don't retry failed tests")
    parser.add_argument("--amplify", type=str, default=None, help="Run the given tests multiple times in a row")
    opts = CliOpts(**vars(parser.parse_args()))

    # Set up logging
    if opts.debug:
        logging.basicConfig(level=logging.DEBUG, format='%(levelname)s:run-tests:%(message)s')

    if opts.machine:
        if not opts.browser:
            parser.error("--browser must be specified together with --machine")
        opts.nondestructive = True

    # Tell any subprocesses what we are testing
    if "TEST_REVISION" not in os.environ:
        r = subprocess.run(["git", "rev-parse", "HEAD"], universal_newlines=True, check=False, stdout=subprocess.PIPE)
        if r.returncode == 0:
            os.environ["TEST_REVISION"] = r.stdout.strip()

    os.environ["TEST_BROWSER"] = os.environ.get("TEST_BROWSER", "chromium")

    image = testvm.DEFAULT_IMAGE
    testvm.DEFAULT_IMAGE = image
    os.environ["TEST_OS"] = image

    # on RHEL 8, provide enough RAM for cryptsetup's PBKDF (https://issues.redhat.com/browse/RHEL-8258)
    # On any newer OS, cryptsetup gets along with less RAM
    if image.startswith("rhel-8") and opts.nondestructive_memory_mb == DEFAULT_MACHINE_MEMORY_MB:
        opts.nondestructive_memory_mb = 1400

    # Make sure tests can make relative imports
    sys.path.append(os.path.realpath(opts.test_dir))

    if opts.list:
        list_tests(opts)
        return 0

    return run(opts, image)


if __name__ == "__main__":
    sys.exit(main())
