depot_tools/siso.py

#!/usr/bin/env python3
# Copyright 2023 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""This script is a wrapper around the siso binary that is pulled to
third_party as part of gclient sync. It will automatically find the siso
binary when run inside a gclient source tree, so users can just type
"siso" on the command line."""

import itertools
import os
import platform
import signal
import shlex
import shutil
import sys

import caffeinate
import gclient_paths


def parse_args(args):
    subcmd = ''
    out_dir = "."
    for i, arg in enumerate(args):
        if not arg.startswith("-") and not subcmd:
            subcmd = arg
            continue
        if arg == "-C":
            out_dir = args[i + 1]
        elif arg.startswith("-C"):
            out_dir = arg[2:]
    return subcmd, out_dir


def check_outdir(subcmd, out_dir):
    ninja_marker = os.path.join(out_dir, ".ninja_deps")
    if os.path.exists(ninja_marker):
        print("depot_tools/siso.py: %s contains Ninja state file.\n"
              "Use `autoninja` to use reclient,\n"
              "or run `gn clean %s` to switch from ninja to siso\n" %
              (out_dir, out_dir),
              file=sys.stderr)
        sys.exit(1)


def apply_metrics_labels(args: list[str]) -> list[str]:
    if not args:
        return args
    # We expect ninja calls, else this algorithm is meaningless.
    if args[0] != "ninja":
        return args

    system_dict = {"Windows": "windows", "Darwin": "mac", "Linux": "linux"}
    user_system = system_dict.get(platform.system(), platform.system())

    # TODO(ovsienko) - add targets to the processing. For this, the Siso needs to understand lists.
    for arg in args[1:]:
        # Respect user provided labels, abort.
        if arg.startswith("--metrics_labels") or arg.startswith(
                "-metrics_labels"):
            return args

    result = []
    result.append("type=developer")
    result.append("tool=siso")
    result.append(f"host_os={user_system}")
    return args + ["--metrics_labels", ",".join(result)]


def load_sisorc(rcfile):
    if not os.path.exists(rcfile):
        return [], {}
    global_flags = []
    subcmd_flags = {}
    with open(rcfile) as file:
        for line in file:
            line = line.strip()
            if line.startswith("#"):
                continue
            args = shlex.split(line)
            if len(args) == 0:
                continue
            if line.startswith("-"):
                global_flags.extend(args)
                continue
            subcmd_flags[args[0]] = args[1:]
    return global_flags, subcmd_flags


def apply_sisorc(global_flags, subcmd_flags, args, subcmd):
    new_args = []
    for arg in args:
        if not new_args:
            new_args.extend(global_flags)
        if arg == subcmd:
            new_args.append(arg)
            new_args.extend(subcmd_flags.get(arg, []))
            continue
        new_args.append(arg)
    return new_args


def _is_google_corp_machine():
    """This assumes that corp machine has gcert binary in known location."""
    return shutil.which("gcert") is not None


def main(args):
    # Do not raise KeyboardInterrupt on SIGINT so as to give siso time to run
    # cleanup tasks. Siso will be terminated immediately after the second
    # Ctrl-C.
    original_sigint_handler = signal.getsignal(signal.SIGINT)

    def _ignore(signum, frame):
        try:
            # Call the original signal handler.
            original_sigint_handler(signum, frame)
        except KeyboardInterrupt:
            # Do not reraise KeyboardInterrupt so as to not kill siso too early.
            pass

    signal.signal(signal.SIGINT, _ignore)

    if not sys.platform.startswith('win'):
        signal.signal(signal.SIGTERM, lambda signum, frame: None)

    # On Windows the siso.bat script passes along the arguments enclosed in
    # double quotes. This prevents multiple levels of parsing of the special '^'
    # characters needed when compiling a single file.  When this case is
    # detected, we need to split the argument. This means that arguments
    # containing actual spaces are not supported by siso.bat, but that is not a
    # real limitation.
    if sys.platform.startswith('win') and len(args) == 2:
        args = args[:1] + args[1].split()

    # macOS's python sets CPATH, LIBRARY_PATH, SDKROOT implicitly.
    # https://openradar.appspot.com/radar?id=5608755232243712
    #
    # Removing those environment variables to avoid affecting clang's behaviors.
    if sys.platform == 'darwin':
        os.environ.pop("CPATH", None)
        os.environ.pop("LIBRARY_PATH", None)
        os.environ.pop("SDKROOT", None)

    # if user doesn't set PYTHONPYCACHEPREFIX and PYTHONDONTWRITEBYTECODE
    # set PYTHONDONTWRITEBYTECODE=1 not to create many *.pyc in workspace
    # and keep workspace clean.
    if not os.environ.get("PYTHONPYCACHEPREFIX"):
        os.environ.setdefault("PYTHONDONTWRITEBYTECODE", "1")

    environ = os.environ.copy()

    subcmd, out_dir = parse_args(args[1:])

    # Get gclient root + src.
    primary_solution_path = gclient_paths.GetPrimarySolutionPath(out_dir)
    gclient_root_path = gclient_paths.FindGclientRoot(out_dir)
    gclient_src_root_path = None
    if gclient_root_path:
        gclient_src_root_path = os.path.join(gclient_root_path, 'src')

    siso_override_path = os.environ.get('SISO_PATH')
    if siso_override_path:
        print('depot_tools/siso.py: Using Siso binary from SISO_PATH: %s.' %
              siso_override_path,
              file=sys.stderr)
        if not os.path.isfile(siso_override_path):
            print(
                'depot_tools/siso.py: Could not find Siso at provided '
                'SISO_PATH.',
                file=sys.stderr)
            return 1

    for base_path in set(
        [primary_solution_path, gclient_root_path, gclient_src_root_path]):
        if not base_path:
            continue
        env = environ.copy()
        sisoenv_path = os.path.join(base_path, 'build', 'config', 'siso',
                                    '.sisoenv')
        if not os.path.exists(sisoenv_path):
            continue
        with open(sisoenv_path) as f:
            for line in f.readlines():
                k, v = line.rstrip().split('=', 1)
                env[k] = v
        backend_config_dir = os.path.join(base_path, 'build', 'config', 'siso',
                                          'backend_config')
        if os.path.exists(backend_config_dir) and not os.path.exists(
                os.path.join(backend_config_dir, 'backend.star')):
            if _is_google_corp_machine():
                print(
                    'build/config/siso/backend_config/backend.star does not '
                    'exist.\n'
                    'backend.star is configured by gclient hook '
                    'build/config/siso/configure_siso.py.\n'
                    'Make sure `rbe_instance` gclient custom vars is correct.\n'
                    'Did you run `gclient runhooks` ?',
                    file=sys.stderr)
            else:
                print(
                    'build/config/siso/backend_config/backend.star does not '
                    'exist.\n'
                    'See build/config/siso/backend_config/README.md',
                    file=sys.stderr)
            return 1
        global_flags, subcmd_flags = load_sisorc(
            os.path.join(base_path, 'build', 'config', 'siso', '.sisorc'))
        siso_paths = [
            siso_override_path,
            os.path.join(base_path, 'third_party', 'siso', 'cipd',
                         'siso' + gclient_paths.GetExeSuffix()),
            os.path.join(base_path, 'third_party', 'siso',
                         'siso' + gclient_paths.GetExeSuffix()),
        ]
        for siso_path in siso_paths:
            if siso_path and os.path.isfile(siso_path):
                check_outdir(subcmd, out_dir)
                new_args = apply_sisorc(global_flags, subcmd_flags, args[1:],
                                        subcmd)
                if args[1:] != new_args:
                    print('depot_tools/siso.py: %s' % shlex.join(new_args),
                          file=sys.stderr)
                new_args = apply_metrics_labels(new_args)
                return caffeinate.run([siso_path] + new_args, env=env)
        print(
            'depot_tools/siso.py: Could not find siso in third_party/siso '
            'of the current project. Did you run gclient sync?',
            file=sys.stderr)
        return 1
    if siso_override_path:
        return caffeinate.run([siso_override_path] + args[1:])

    print(
        'depot_tools/siso.py: Could not find .sisoenv under build/config/siso '
        'of the current project. Did you run gclient sync?',
        file=sys.stderr)
    return 1


if __name__ == '__main__':
    sys.exit(main(sys.argv))