# Copyright 2018 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Installs cross toolchain libraries into a sysroot.

This script is not meant to be used by developers directly.
Run at your own risk.
"""

from chromite.lib import commandline
from chromite.lib import cros_build_lib
from chromite.lib import sysroot_lib
from chromite.lib import toolchain


def GetParser():
    """Build the argument parser."""
    parser = commandline.ArgumentParser(description=__doc__)

    parser.add_argument(
        "--noconfigure",
        dest="configure",
        default=True,
        action="store_false",
        help="Disable updating config files in <sysroot>/etc "
        "after installation.",
    )
    parser.add_argument(
        "--force",
        default=False,
        action="store_true",
        help="Install toolchain even if already up to date.",
    )
    parser.add_argument(
        "--toolchain",
        help="Toolchain. For example: i686-pc-linux-gnu, "
        "armv7a-softfloat-linux-gnueabi.",
    )
    parser.add_argument(
        "--sysroot",
        type="path",
        required=True,
        help="The sysroot to install the toolchain for.",
    )

    return parser


def _GetToolchain(toolchain_name, sysroot):
    """Get the toolchain value or exit with an error message."""
    if toolchain_name:
        # Use the CLI argument when provided.
        return toolchain_name

    # Fetch the value from the sysroot.
    toolchain_name = sysroot.GetStandardField(sysroot_lib.STANDARD_FIELD_CHOST)
    if not toolchain_name:
        cros_build_lib.Die(
            "No toolchain specified in the sysroot or command line."
        )

    return toolchain_name


def _ParseArgs(argv):
    """Parse and validate arguments."""
    parser = GetParser()
    opts = parser.parse_args(argv)

    # Expand the sysroot path to a sysroot object.
    opts.sysroot = sysroot_lib.Sysroot(opts.sysroot)
    # Make sure the toolchain value reflects the toolchain we will be using.
    opts.toolchain = _GetToolchain(opts.toolchain, opts.sysroot)

    opts.Freeze()
    return opts


def main(argv):
    cros_build_lib.AssertInsideChroot()

    opts = _ParseArgs(argv)
    try:
        toolchain.InstallToolchain(
            sysroot=opts.sysroot,
            toolchain=opts.toolchain,
            force=opts.force,
            configure=opts.configure,
        )
    except (toolchain.Error, cros_build_lib.RunCommandError, ValueError) as e:
        cros_build_lib.Die(e)