scripts/has_prebuilt.py

# Copyright 2020 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Script to check if the package(s) have prebuilts.

The script must be run inside the chroot. The output is a json dict mapping the
package atoms to a boolean for whether a prebuilt exists.
"""

import json
import os

from chromite.lib import commandline
from chromite.lib import cros_build_lib
from chromite.lib import osutils
from chromite.lib import portage_util
from chromite.lib.parser import package_info


if cros_build_lib.IsInsideChroot():
    from chromite.lib import depgraph


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

    parser.add_argument(
        "-b",
        "--build-target",
        dest="build_target_name",
        help="The build target that is being checked.",
    )
    parser.add_argument(
        "--output",
        type="path",
        required=True,
        help="The file path where the result json should be stored.",
    )
    parser.add_argument(
        "packages", nargs="+", help="The package atoms that are being checked."
    )

    return parser


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

    if not os.path.exists(os.path.dirname(opts.output)):
        parser.error("Path containing the output file does not exist.")

    # Manually parse the packages as CPVs.
    packages = []
    for pkg in opts.packages:
        cpv = package_info.parse(pkg)
        if not cpv.atom:
            parser.error("Invalid package atom: %s" % pkg)

        packages.append(cpv)
    opts.packages = packages

    opts.Freeze()
    return opts


def main(argv):
    opts = _ParseArguments(argv)
    cros_build_lib.AssertInsideChroot()

    board = opts.build_target_name
    bests = {}
    for cpv in opts.packages:
        bests[cpv.atom] = portage_util.PortageqBestVisible(
            cpv.atom, board=board
        )

    # Emerge args:
    #   g: use binpkgs (needed to find if we have one)
    #   u: update packages to the latest version (want updates to invalidate
    #       binpkgs)
    #   D: deep -- consider full tree rather that just immediate deps
    #     (changes in dependencies and transitive deps can invalidate a binpkg)
    #   N: Packages with changed use flags should be considered
    #     (changes in dependencies and transitive deps can invalidate a binpkg)
    #   q: quiet (simplifies output)
    #   p: pretend (don't actually install it)
    args = ["-guDNqp", "--with-bdeps=y", "--color=n"]
    if board:
        args.append("--board=%s" % board)
    args.extend("=%s" % best.cpvr for best in bests.values())

    generator = depgraph.DepGraphGenerator()
    generator.Initialize(args)

    results = {}
    for atom, best in bests.items():
        results[atom] = generator.HasPrebuilt(best.cpvr)

    osutils.WriteFile(opts.output, json.dumps(results))