# Copyright 2021 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""determinism_check.py - Runs two builds with the same checkout and compares
                          their output to validate the build produces
                          deterministic blobs.
"""

from PB.recipes.fuchsia.fuchsia.determinism_check import InputProperties

DEPS = [
    "fuchsia/build",
    "fuchsia/buildbucket_util",
    "fuchsia/checkout",
    "recipe_engine/file",
    "recipe_engine/path",
    "recipe_engine/properties",
    "recipe_engine/step",
]

PROPERTIES = InputProperties

# From the Fuchsia source tree
_COMPARE_SCRIPT = "build/scripts/compare-build-dirs.sh"


def RunSteps(api, props):
    checkout = api.checkout.fuchsia_with_options(
        manifest=props.manifest,
        remote=props.remote,
    )

    # Build twice to the same output dir, and move it to a
    # backup location each time.
    with api.step.nest("build 1"):
        saved_build_dir_1 = run_build(api, checkout, props)

    with api.step.nest("build 2"):
        saved_build_dir_2 = run_build(api, checkout, props)

    compare_script = api.path.join(checkout.root_dir, _COMPARE_SCRIPT)
    api.step(
        "compare built artifacts",
        [compare_script, saved_build_dir_1, saved_build_dir_2],
    )


def run_build(api, checkout, props):
    """Performs a single build of fuchsia.

    Returns:
      A backup location of the build output dir.
    """
    build_results = api.build.with_options(
        checkout, fint_params_path=props.fint_params_path
    )

    # Save it to a backup location, so we can rebuild over the original
    # location.
    new_build_dir = api.path.mkdtemp()
    api.file.move(
        f"move outdir to {new_build_dir}", build_results.build_dir, new_build_dir
    )
    return new_build_dir


def GenTests(api):
    properties = {
        "manifest": "minimal",
        "project": "integration",
        "remote": "https://fuchsia.googlesource.com/manifest",
        "fint_params_path": "fint_params/core.textproto",
    }

    # Test case for deterministic builds.
    yield (
        api.buildbucket_util.test("deterministic_build", tryjob=False)
        + api.properties(**properties)
    )

    # Test case where builds contain differences.
    yield (
        api.buildbucket_util.test("differences_found", tryjob=False, status="FAILURE")
        + api.step_data(
            "compare built artifacts",
            retcode=1,
        )
        + api.properties(**properties)
    )