#!/usr/bin/env python3
# Copyright 2021 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Wrapper for platform2_test for meson packages.

This mostly sets some environment variables that can't easily be set
in meson.eclass.
"""

import os
from pathlib import Path
import sys


def translate_path(sysroot, path):
  """Remove the SYSROOT prefix from paths that have it"""

  if path.startswith(sysroot):
    return path[len(sysroot):]
  return path


def append_env_path(real_argv, sysroot, env_name):
  """Translate the path in |env_name| and add it to |real_argv|"""

  if env_name in os.environ:
    translated_path = translate_path(sysroot, os.environ[env_name])
    real_argv += ['--env', f'{env_name}={translated_path}']


def main(argv):
  DIR = Path(__file__).resolve().parent
  real_argv = [DIR / 'platform2_test.py']

  sysroot = os.environ['SYSROOT']
  real_argv += ['--sysroot', sysroot]

  # MALLOC_PERTURB_ is used by meson to increase test reproducibility.
  if 'MALLOC_PERTURB_' in os.environ:
    real_argv += ['--env', f'MALLOC_PERTURB_={os.environ["MALLOC_PERTURB_"]}']

  # Several meson packages pass the path to the build or source
  # directory into their tests using an environment variable so they
  # can read data files or execute other test programs. These paths
  # will be from the perspective of the cros chroot, not from the
  # build sysroot that the test is actually going to run from. We
  # can translate these paths by just stripping the ${SYSROOT}
  # prefix from the start.
  #
  # Unfortunately there doesn't seem to be any standard approach to
  # this, so we just have to look at all the env variables we have
  # observed being used in this way.

  # Used by dev-libs/wayland
  append_env_path(real_argv, sysroot, 'TEST_BUILD_DIR')
  append_env_path(real_argv, sysroot, 'TEST_SRC_DIR')

  # Used by media-libs/harfbuzz, dev-libs/json-glib, app-arch/gcab,
  # dev-libs/glib
  append_env_path(real_argv, sysroot, 'G_TEST_BUILDDIR')
  append_env_path(real_argv, sysroot, 'G_TEST_SRCDIR')

  # Used by x11-libs/libxkbcommon
  append_env_path(real_argv, sysroot, 'top_builddir')
  append_env_path(real_argv, sysroot, 'top_srcdir')

  real_argv += ['--']
  real_argv += argv

  print(f'Running {real_argv}', flush=True)
  os.execv(real_argv[0], real_argv)


if __name__ == '__main__':
  sys.exit(main(sys.argv[1:]))