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#
#  Copyright (C) 2018 Codethink Limited
#  Copyright (C) 2018 Bloomberg Finance LP
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public
#  License as published by the Free Software Foundation; either
#  version 2 of the License, or (at your option) any later version.
#
#  This library is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#  Lesser General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public
#  License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
#  Authors: Richard Maw <richard.maw@codethink.co.uk>
#

# Pylint doesn't play well with fixtures and dependency injection from pytest
# pylint: disable=redefined-outer-name

import os
import shutil

import pytest

from buildstream.testing import cli_integration as cli  # pylint: disable=unused-import
from buildstream.testing._utils.site import HAVE_SANDBOX

from tests.testutils import create_artifact_share


pytestmark = pytest.mark.integration


# Project directory
DATA_DIR = os.path.join(os.path.dirname(os.path.realpath(__file__)), "project",)


# A test to capture the integration of the cachebuildtrees
# behaviour, which by default is to include the buildtree
# content of an element on caching.

# Dse this really need a sandbox?
@pytest.mark.datafiles(DATA_DIR)
@pytest.mark.skipif(not HAVE_SANDBOX, reason="Only available with a functioning sandbox")
def test_cache_buildtrees(cli, tmpdir, datafiles):
    project = str(datafiles)
    element_name = "autotools/amhello.bst"
    cwd = str(tmpdir)

    # Create artifact shares for pull & push testing
    with create_artifact_share(os.path.join(str(tmpdir), "share1")) as share1, create_artifact_share(
        os.path.join(str(tmpdir), "share2")
    ) as share2, create_artifact_share(os.path.join(str(tmpdir), "share3")) as share3:
        cli.configure({"artifacts": {"url": share1.repo, "push": True}, "cachedir": str(tmpdir)})

        # Build autotools element with the default behavior of caching buildtrees
        # only when necessary. The artifact should be successfully pushed to the share1 remote
        # and cached locally with an 'empty' buildtree digest, as it's not a
        # dangling ref
        result = cli.run(project=project, args=["build", element_name])
        assert result.exit_code == 0
        assert cli.get_element_state(project, element_name) == "cached"
        assert share1.get_artifact(cli.get_artifact_name(project, "test", element_name))

        # The buildtree dir should not exist, as we set the config to not cache buildtrees.

        artifact_name = cli.get_artifact_name(project, "test", element_name)
        assert share1.get_artifact(artifact_name)
        with cli.artifact.extract_buildtree(cwd, cwd, artifact_name) as buildtreedir:
            assert not buildtreedir

        # Delete the local cached artifacts, and assert the when pulled with --pull-buildtrees
        # that is was cached in share1 as expected without a buildtree dir
        shutil.rmtree(os.path.join(str(tmpdir), "cas"))
        shutil.rmtree(os.path.join(str(tmpdir), "artifacts"))
        assert cli.get_element_state(project, element_name) != "cached"
        result = cli.run(project=project, args=["--pull-buildtrees", "artifact", "pull", element_name])
        assert element_name in result.get_pulled_elements()
        with cli.artifact.extract_buildtree(cwd, cwd, artifact_name) as buildtreedir:
            assert not buildtreedir
        shutil.rmtree(os.path.join(str(tmpdir), "cas"))
        shutil.rmtree(os.path.join(str(tmpdir), "artifacts"))

        # Assert that the default behaviour of pull to not include buildtrees on the artifact
        # in share1 which was purposely cached with an empty one behaves as expected. As such the
        # pulled artifact will have a dangling ref for the buildtree dir, regardless of content,
        # leading to no buildtreedir being extracted
        result = cli.run(project=project, args=["artifact", "pull", element_name])
        assert element_name in result.get_pulled_elements()
        with cli.artifact.extract_buildtree(cwd, cwd, artifact_name) as buildtreedir:
            assert not buildtreedir
        shutil.rmtree(os.path.join(str(tmpdir), "cas"))
        shutil.rmtree(os.path.join(str(tmpdir), "artifacts"))

        # Repeat building the artifacts, this time with cache-buildtrees set to
        # 'always' via the cli, as such the buildtree dir should not be empty
        cli.configure({"artifacts": {"url": share2.repo, "push": True}, "cachedir": str(tmpdir)})
        result = cli.run(project=project, args=["--cache-buildtrees", "always", "build", element_name])
        assert result.exit_code == 0
        assert cli.get_element_state(project, element_name) == "cached"
        assert share2.get_artifact(cli.get_artifact_name(project, "test", element_name))

        # Cache key will be the same however the digest hash will have changed as expected, so reconstruct paths
        with cli.artifact.extract_buildtree(cwd, cwd, artifact_name) as buildtreedir:
            assert os.path.isdir(buildtreedir)
            assert os.listdir(buildtreedir)

        # Delete the local cached artifacts, and assert that when pulled with --pull-buildtrees
        # that it was cached in share2 as expected with a populated buildtree dir
        shutil.rmtree(os.path.join(str(tmpdir), "cas"))
        shutil.rmtree(os.path.join(str(tmpdir), "artifacts"))
        assert cli.get_element_state(project, element_name) != "cached"
        result = cli.run(project=project, args=["--pull-buildtrees", "artifact", "pull", element_name])
        assert element_name in result.get_pulled_elements()
        with cli.artifact.extract_buildtree(cwd, cwd, artifact_name) as buildtreedir:
            assert os.path.isdir(buildtreedir)
            assert os.listdir(buildtreedir)
        shutil.rmtree(os.path.join(str(tmpdir), "cas"))
        shutil.rmtree(os.path.join(str(tmpdir), "artifacts"))

        # Clarify that the user config option for cache-buildtrees works as the cli
        # main option does. Point to share3 which does not have the artifacts cached to force
        # a build
        cli.configure(
            {
                "artifacts": {"url": share3.repo, "push": True},
                "cachedir": str(tmpdir),
                "cache": {"cache-buildtrees": "always"},
            }
        )
        result = cli.run(project=project, args=["build", element_name])
        assert result.exit_code == 0
        assert cli.get_element_state(project, element_name) == "cached"
        with cli.artifact.extract_buildtree(cwd, cwd, artifact_name) as buildtreedir:
            assert os.path.isdir(buildtreedir)
            assert os.listdir(buildtreedir)