pw_env_setup/py/pw_env_setup/host_build_setup.py

# Copyright 2020 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
"""Builds and sets up environment to use host build."""

from __future__ import print_function

import os
import platform
import subprocess
import sys
import tempfile


# TODO(pwbug/135) Move to common utility module.
def _check_call(args, **kwargs):
    stdout = kwargs.get('stdout', sys.stdout)

    with tempfile.TemporaryFile(mode='w+') as temp:
        try:
            kwargs['stdout'] = temp
            kwargs['stderr'] = subprocess.STDOUT
            print(args, kwargs, file=temp)
            subprocess.check_call(args, **kwargs)
        except subprocess.CalledProcessError:
            temp.seek(0)
            stdout.write(temp.read())
            raise


def install(pw_root, env):
    host_dir = os.path.join(pw_root, 'out', 'host')
    env.prepend('PATH', os.path.join(host_dir, 'host_tools'))

    if platform.system() == 'Linux':
        env.echo('  skipping host tools setup--got from CIPD')
        return

    with env():
        try:
            gn_gen = [
                'gn',
                'gen',
                '--args=pw_target_toolchain="//pw_toolchain:host_clang_og"',
                host_dir,
            ]
            _check_call(gn_gen, cwd=pw_root)

            _check_call(['ninja', '-C', host_dir], cwd=pw_root)

        except subprocess.CalledProcessError:
            env.echo('  warning: host tools failed to build')