scripts/cbuildbot_launch_unittest.py

# Copyright 2016 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Unit tests for chromite.scripts.cbuildbot_launch."""

import os
import time
from unittest import mock

from chromite.cbuildbot import commands
from chromite.cbuildbot import repository
from chromite.lib import build_summary
from chromite.lib import constants
from chromite.lib import cros_sdk_lib
from chromite.lib import cros_test_lib
from chromite.lib import osutils
from chromite.lib import timeout_util
from chromite.scripts import cbuildbot_launch


EXPECTED_MANIFEST_URL = "https://chrome-internal-review.googlesource.com/chromeos/manifest-internal"  # pylint: disable=line-too-long


# It's reasonable for unittests to look at internals.
# pylint: disable=protected-access


class FakeException(Exception):
    """Test exception to raise during tests."""


class CbuildbotLaunchTest(cros_test_lib.MockTestCase):
    """Tests for cbuildbot_launch script."""

    def testPreParseArguments(self):
        """Test that we can correctly extract branch values from cbuildbot args."""
        CASES = (
            (
                ["--buildroot", "/buildroot", "daisy-incremental"],
                (None, "/buildroot", None),
            ),
            (
                [
                    "--buildbot",
                    "--buildroot",
                    "/buildroot",
                    "--git-cache-dir",
                    "/git-cache",
                    "-b",
                    "release-R57-9202.B",
                    "daisy-incremental",
                ],
                ("release-R57-9202.B", "/buildroot", "/git-cache"),
            ),
            (
                [
                    "--debug",
                    "--buildbot",
                    "--notests",
                    "--buildroot",
                    "/buildroot",
                    "--git-cache-dir",
                    "/git-cache",
                    "--branch",
                    "release-R57-9202.B",
                    "daisy-incremental",
                ],
                ("release-R57-9202.B", "/buildroot", "/git-cache"),
            ),
        )

        for cmd_args, expected in CASES:
            expected_branch, expected_buildroot, expected_cache_dir = expected

            options = cbuildbot_launch.PreParseArguments(cmd_args)

            self.assertEqual(options.branch, expected_branch)
            self.assertEqual(options.buildroot, expected_buildroot)
            self.assertEqual(options.git_cache_dir, expected_cache_dir)

    def testInitialCheckout(self):
        """Test InitialCheckout with minimum settings."""
        mock_repo = mock.MagicMock()
        mock_repo.branch = "branch"
        argv = ["-r", "/root", "config"]
        options = cbuildbot_launch.PreParseArguments(argv)

        cbuildbot_launch.InitialCheckout(mock_repo, options)

        self.assertEqual(
            mock_repo.mock_calls,
            [
                mock.call.PreLoad("/preload/chromeos"),
                mock.call.Sync(jobs=32, detach=True, downgrade_repo=False),
            ],
        )

    def testConfigureGlobalEnvironment(self):
        """Ensure that we can setup our global runtime environment correctly."""

        os.environ.pop("LANG", None)
        os.environ["LC_MONETARY"] = "bad"

        cbuildbot_launch.ConfigureGlobalEnvironment()

        # Verify umask is updated.
        self.assertEqual(os.umask(0), 0o22)

        # Verify ENVs are cleaned up.
        self.assertEqual(os.environ["LANG"], "en_US.UTF-8")
        self.assertNotIn("LC_MONETARY", os.environ)


class RunTests(cros_test_lib.RunCommandTestCase):
    """Tests for cbuildbot_launch script."""

    ARGS_BASE = ["--buildroot", "/buildroot"]
    EXPECTED_ARGS_BASE = ["--buildroot", "/cbuildbot_buildroot"]
    ARGS_GIT_CACHE = ["--git-cache-dir", "/git-cache"]
    ARGS_CONFIG = ["config"]
    CMD = ["/cbuildbot_buildroot/chromite/bin/cbuildbot"]

    def verifyCbuildbot(self, args, expected_cmd, version):
        """Ensure we invoke cbuildbot correctly."""
        self.PatchObject(
            commands,
            "GetTargetChromiteApiVersion",
            autospec=True,
            return_value=version,
        )

        cbuildbot_launch.Cbuildbot("/cbuildbot_buildroot", "/depot_tools", args)

        self.assertCommandCalled(
            expected_cmd,
            extra_env={"PATH": mock.ANY},
            cwd="/cbuildbot_buildroot",
            check=False,
        )

    def testCbuildbotSimple(self):
        """Ensure we invoke cbuildbot correctly."""
        self.verifyCbuildbot(
            self.ARGS_BASE + self.ARGS_CONFIG,
            self.CMD + self.ARGS_CONFIG + self.EXPECTED_ARGS_BASE,
            (0, 4),
        )

    def testCbuildbotNotFiltered(self):
        """Ensure we invoke cbuildbot correctly."""
        self.verifyCbuildbot(
            self.ARGS_BASE + self.ARGS_CONFIG + self.ARGS_GIT_CACHE,
            (
                self.CMD
                + self.ARGS_CONFIG
                + self.EXPECTED_ARGS_BASE
                + self.ARGS_GIT_CACHE
            ),
            (0, 4),
        )

    def testCbuildbotFiltered(self):
        """Ensure we invoke cbuildbot correctly."""
        self.verifyCbuildbot(
            self.ARGS_BASE + self.ARGS_CONFIG + self.ARGS_GIT_CACHE,
            self.CMD + self.ARGS_CONFIG + self.EXPECTED_ARGS_BASE,
            (0, 2),
        )

    def testMainMin(self):
        """Test a minimal set of command line options."""
        self.PatchObject(osutils, "SafeMakedirs", autospec=True)
        self.PatchObject(
            commands,
            "GetTargetChromiteApiVersion",
            autospec=True,
            return_value=(
                constants.REEXEC_API_MAJOR,
                constants.REEXEC_API_MINOR,
            ),
        )
        mock_repo = mock.MagicMock()
        mock_repo.branch = "main"
        mock_repo.directory = "/root/repository"

        mock_repo_create = self.PatchObject(
            repository, "RepoRepository", autospec=True, return_value=mock_repo
        )
        mock_clean = self.PatchObject(
            cbuildbot_launch, "CleanBuildRoot", autospec=True
        )
        mock_checkout = self.PatchObject(
            cbuildbot_launch, "InitialCheckout", autospec=True
        )
        mock_cleanup_chroot = self.PatchObject(
            cbuildbot_launch, "CleanupChroot", autospec=True
        )
        mock_set_last_build_state = self.PatchObject(
            cbuildbot_launch, "SetLastBuildState", autospec=True
        )

        expected_build_state = build_summary.BuildSummary(
            build_number=0,
            master_build_id=0,
            status=mock.ANY,
            buildroot_layout=2,
            branch="main",
        )

        argv = ["-r", "/root", "config"]
        options = cbuildbot_launch.PreParseArguments(argv)
        cbuildbot_launch._main(options, argv)

        # Did we create the repo instance correctly?
        self.assertEqual(
            mock_repo_create.mock_calls,
            [
                mock.call(
                    EXPECTED_MANIFEST_URL,
                    "/root/repository",
                    git_cache_dir=None,
                    branch="main",
                )
            ],
        )

        # Ensure we clean, as expected.
        self.assertEqual(
            mock_clean.mock_calls,
            [
                mock.call(
                    "/root",
                    mock_repo,
                    "/root/repository/.cache",
                    expected_build_state,
                    False,
                )
            ],
        )

        # Ensure we checkout, as expected.
        self.assertEqual(
            mock_checkout.mock_calls, [mock.call(mock_repo, options)]
        )

        # Ensure we invoke cbuildbot, as expected.
        self.assertCommandCalled(
            [
                "/root/repository/chromite/bin/cbuildbot",
                "config",
                "-r",
                "/root/repository",
                "--workspace",
                "/root/workspace",
                "--cache-dir",
                "/root/repository/.cache",
                # The duplication is a bug, but not harmful.
                "--cache-dir",
                "/root/repository/.cache",
            ],
            extra_env={"PATH": mock.ANY},
            cwd="/root/repository",
            check=False,
        )

        # Ensure we saved the final state, as expected.
        self.assertEqual(
            expected_build_state.status, constants.BUILDER_STATUS_PASSED
        )
        self.assertEqual(
            mock_set_last_build_state.mock_calls,
            [mock.call("/root", expected_build_state)],
        )

        # Ensure we clean the chroot, as expected.
        mock_cleanup_chroot.assert_called_once_with("/root/repository")

    def testMainMax(self):
        """Test a larger set of command line options."""
        self.PatchObject(osutils, "SafeMakedirs", autospec=True)
        self.PatchObject(
            commands,
            "GetTargetChromiteApiVersion",
            autospec=True,
            return_value=(
                constants.REEXEC_API_MAJOR,
                constants.REEXEC_API_MINOR,
            ),
        )
        mock_repo = mock.MagicMock()
        mock_repo.branch = "branch"
        mock_repo.directory = "/root/repository"

        mock_summary = build_summary.BuildSummary(
            build_number=313,
            master_build_id=123123123,
            status=constants.BUILDER_STATUS_FAILED,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branch",
        )

        mock_get_last_build_state = self.PatchObject(
            cbuildbot_launch,
            "GetLastBuildState",
            autospec=True,
            return_value=mock_summary,
        )
        mock_repo_create = self.PatchObject(
            repository, "RepoRepository", autospec=True, return_value=mock_repo
        )
        mock_clean = self.PatchObject(
            cbuildbot_launch, "CleanBuildRoot", autospec=True
        )
        mock_checkout = self.PatchObject(
            cbuildbot_launch, "InitialCheckout", autospec=True
        )
        mock_cleanup_chroot = self.PatchObject(
            cbuildbot_launch, "CleanupChroot", autospec=True
        )
        mock_set_last_build_state = self.PatchObject(
            cbuildbot_launch, "SetLastBuildState", autospec=True
        )
        argv = [
            "--buildroot",
            "/root",
            "--branch",
            "branch",
            "--git-cache-dir",
            "/git-cache",
            "--cache-dir",
            "/cache",
            "--remote-trybot",
            "--master-build-id",
            "123456789",
            "--buildnumber",
            "314",
            "config",
        ]
        options = cbuildbot_launch.PreParseArguments(argv)
        cbuildbot_launch._main(options, argv)

        # Did we create the repo instance correctly?
        self.assertEqual(
            mock_repo_create.mock_calls,
            [
                mock.call(
                    EXPECTED_MANIFEST_URL,
                    "/root/repository",
                    git_cache_dir="/git-cache",
                    branch="branch",
                )
            ],
        )

        # Ensure we look up the previous status.
        self.assertEqual(
            mock_get_last_build_state.mock_calls, [mock.call("/root")]
        )

        # Ensure we clean, as expected.
        self.assertEqual(
            mock_clean.mock_calls,
            [
                mock.call(
                    "/root",
                    mock_repo,
                    "/cache",
                    build_summary.BuildSummary(
                        build_number=314,
                        master_build_id=123456789,
                        status=mock.ANY,
                        branch="branch",
                        buildroot_layout=2,
                    ),
                    False,
                )
            ],
        )

        # Ensure we checkout, as expected.
        self.assertEqual(
            mock_checkout.mock_calls, [mock.call(mock_repo, options)]
        )

        # Ensure we invoke cbuildbot, as expected.
        self.assertCommandCalled(
            [
                "/root/repository/chromite/bin/cbuildbot",
                "config",
                "--buildroot",
                "/root/repository",
                "--branch",
                "branch",
                "--git-cache-dir",
                "/git-cache",
                "--cache-dir",
                "/cache",
                "--remote-trybot",
                "--master-build-id",
                "123456789",
                "--buildnumber",
                "314",
                "--previous-build-state",
                "eyJicmFuY2giOiJicmFuY2giLCJidWlsZF9udW1iZXIiOjMxMywiYnVpbGRyb290X"
                "2xheW91dCI6MiwibWFzdGVyX2J1aWxkX2lkIjoxMjMxMjMxMjMsInN0YXR1cyI6Im"
                "ZhaWwifQ==",
                "--workspace",
                "/root/workspace",
                "--cache-dir",
                "/cache",
            ],
            extra_env={"PATH": mock.ANY},
            cwd="/root/repository",
            check=False,
        )

        # Ensure we write the final build state, as expected.
        final_state = build_summary.BuildSummary(
            build_number=314,
            master_build_id=123456789,
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=2,
            branch="branch",
        )
        self.assertEqual(
            mock_set_last_build_state.mock_calls,
            [mock.call("/root", final_state)],
        )

        # Ensure we clean the chroot, as expected.
        mock_cleanup_chroot.assert_called_once_with("/root/repository")


class CleanBuildRootTest(cros_test_lib.MockTempDirTestCase):
    """Tests for CleanBuildRoot method."""

    def setUp(self):
        """Create standard buildroot contents for cleanup."""
        self.root = os.path.join(self.tempdir)
        self.previous_build_state = os.path.join(
            self.root, ".cbuildbot_build_state.json"
        )
        self.buildroot = os.path.join(self.root, "buildroot")
        self.repo = os.path.join(self.buildroot, ".repo/repo")
        self.chroot = os.path.join(self.buildroot, "chroot")
        self.general = os.path.join(self.buildroot, "general/general")
        self.cache = os.path.join(self.buildroot, ".cache")
        self.distfiles = os.path.join(self.cache, "distfiles")

        self.mock_repo = mock.Mock(repository.RepoRepository)
        self.mock_repo.directory = self.buildroot

    def populateBuildroot(self, previous_build_state=None):
        """Create standard buildroot contents for cleanup."""
        if previous_build_state:
            osutils.SafeMakedirs(self.root)
            osutils.WriteFile(self.previous_build_state, previous_build_state)

        # Create files.
        for f in (self.repo, self.chroot, self.general, self.distfiles):
            osutils.Touch(f, makedirs=True)

    def testNoBuildroot(self):
        """Test CleanBuildRoot with no history."""
        self.mock_repo.branch = "main"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="main",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "main")
        self.assertIsNotNone(new_summary.distfiles_ts)
        self.assertEqual(new_summary, build_state)

        self.assertExists(self.previous_build_state)

    def testBuildrootNoState(self):
        """Test CleanBuildRoot with no state information."""
        self.populateBuildroot()
        self.mock_repo.branch = "main"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="main",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "main")
        self.assertIsNotNone(new_summary.distfiles_ts)
        self.assertEqual(new_summary, build_state)

        self.assertNotExists(self.repo)
        self.assertNotExists(self.chroot)
        self.assertNotExists(self.general)
        self.assertNotExists(self.distfiles)
        self.assertExists(self.previous_build_state)

    def testBuildrootFormatMismatch(self):
        """Test CleanBuildRoot with buildroot layout mismatch."""
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=1,
            branch="main",
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "main"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="main",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "main")
        self.assertIsNotNone(new_summary.distfiles_ts)
        self.assertEqual(new_summary, build_state)

        self.assertNotExists(self.repo)
        self.assertNotExists(self.chroot)
        self.assertNotExists(self.general)
        self.assertNotExists(self.distfiles)
        self.assertExists(self.previous_build_state)

    def testBuildrootBranchChange(self):
        """Test CleanBuildRoot with a change in branches."""
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=2,
            branch="branchA",
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchB"
        m = self.PatchObject(cros_sdk_lib, "CleanupChrootMount")

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchB",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "branchB")
        self.assertIsNotNone(new_summary.distfiles_ts)
        self.assertEqual(new_summary, build_state)

        # self.assertExists(self.repo)
        self.assertExists(self.general)
        self.assertNotExists(self.distfiles)
        self.assertExists(self.previous_build_state)
        m.assert_called_with(self.chroot, delete=True)

    def testBuildrootBranchMatch(self):
        """Test CleanBuildRoot with no change in branch."""
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=2,
            branch="branchA",
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchA"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchA",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "branchA")
        self.assertIsNotNone(new_summary.distfiles_ts)
        self.assertEqual(new_summary, build_state)

        self.assertExists(self.repo)
        self.assertExists(self.chroot)
        self.assertExists(self.general)
        self.assertExists(self.distfiles)
        self.assertExists(self.previous_build_state)

    def testBuildrootGitLocksPrevPass(self):
        """Verify not CleanStaleLocks, if previous build was in passed."""
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=2,
            branch="branchA",
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchA"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchA",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        self.assertEqual(
            self.mock_repo.mock_calls,
            [
                mock.call.PreLoad(),
                mock.call.BuildRootGitCleanup(prune_all=True),
            ],
        )

    def testBuildrootGitLocksPrevFail(self):
        """Verify not CleanStaleLocks, if previous build was in failed."""
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_FAILED,
            buildroot_layout=2,
            branch="branchA",
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchA"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchA",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        self.assertEqual(
            self.mock_repo.mock_calls,
            [
                mock.call.PreLoad(),
                mock.call.BuildRootGitCleanup(prune_all=True),
            ],
        )

    def testBuildrootGitLocksPrevInFlight(self):
        """Verify CleanStaleLocks, if previous build was in flight."""
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=2,
            branch="branchA",
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchA"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchA",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        self.assertEqual(
            self.mock_repo.method_calls,
            [
                mock.call.PreLoad(),
                mock.call.CleanStaleLocks(),
                mock.call.BuildRootGitCleanup(prune_all=True),
            ],
        )

    def testBuildrootDistfilesRecentCache(self):
        """Test CleanBuildRoot does not delete distfiles when cache is recent."""
        seed_distfiles_ts = time.time() - 60
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=2,
            branch="branchA",
            distfiles_ts=seed_distfiles_ts,
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchA"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchA",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "branchA")
        # Same cache creation timestamp is rewritten to state.
        self.assertEqual(new_summary.distfiles_ts, seed_distfiles_ts)
        self.assertEqual(new_summary, build_state)

        self.assertExists(self.repo)
        self.assertExists(self.chroot)
        self.assertExists(self.general)
        self.assertExists(self.distfiles)
        self.assertExists(self.previous_build_state)

    def testBuildrootDistfilesCacheExpired(self):
        """Test CleanBuildRoot when the distfiles cache is too old."""
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=2,
            branch="branchA",
            distfiles_ts=100.0,
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchA"

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchA",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "branchA")
        self.assertIsNotNone(new_summary.distfiles_ts)
        self.assertEqual(new_summary, build_state)

        self.assertExists(self.repo)
        self.assertExists(self.chroot)
        self.assertExists(self.general)
        self.assertNotExists(self.distfiles)
        self.assertExists(self.previous_build_state)

    def testRootOwnedCache(self):
        """Test CleanBuildRoot with no history."""
        seed_distfiles_ts = time.time() - 60
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=2,
            branch="branchA",
            distfiles_ts=seed_distfiles_ts,
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchA"

        osutils.Chown(self.cache, "root", "root")

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchA",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "branchA")
        # Same cache creation timestamp is rewritten to state.
        self.assertEqual(new_summary.distfiles_ts, seed_distfiles_ts)
        self.assertEqual(new_summary, build_state)

        self.assertExists(self.repo)
        self.assertExists(self.chroot)
        self.assertExists(self.general)
        self.assertNotExists(self.distfiles)
        self.assertExists(self.previous_build_state)

    def testBuildrootRepoCleanFailure(self):
        """Test CleanBuildRoot with repo checkout failure."""
        old_build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_PASSED,
            buildroot_layout=1,
            branch="branchA",
        )
        self.populateBuildroot(previous_build_state=old_build_state.to_json())
        self.mock_repo.branch = "branchA"
        self.mock_repo.BuildRootGitCleanup.side_effect = Exception

        build_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=cbuildbot_launch.BUILDROOT_BUILDROOT_LAYOUT,
            branch="branchA",
        )
        cbuildbot_launch.CleanBuildRoot(
            self.root, self.mock_repo, self.cache, build_state
        )

        new_summary = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(new_summary.buildroot_layout, 2)
        self.assertEqual(new_summary.branch, "branchA")
        self.assertIsNotNone(new_summary.distfiles_ts)
        self.assertEqual(new_summary, build_state)

        self.assertNotExists(self.repo)
        self.assertNotExists(self.chroot)
        self.assertNotExists(self.general)
        self.assertNotExists(self.distfiles)
        self.assertExists(self.previous_build_state)

    def testGetCurrentBuildStateNoArgs(self):
        """Tests GetCurrentBuildState without arguments."""
        options = cbuildbot_launch.PreParseArguments(
            ["--buildroot", self.root, "config"]
        )
        state = cbuildbot_launch.GetCurrentBuildState(options, "main")

        expected_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=2,
            branch="main",
        )
        self.assertEqual(state, expected_state)

    def testGetCurrentBuildStateHasArgs(self):
        """Tests GetCurrentBuildState with arguments."""
        options = cbuildbot_launch.PreParseArguments(
            [
                "--buildroot",
                self.root,
                "--buildnumber",
                "20",
                "--master-build-id",
                "50",
                "config",
            ]
        )
        state = cbuildbot_launch.GetCurrentBuildState(options, "branchA")

        expected_state = build_summary.BuildSummary(
            build_number=20,
            master_build_id=50,
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=2,
            branch="branchA",
        )
        self.assertEqual(state, expected_state)

    def testGetCurrentBuildStateLayout(self):
        """Test that GetCurrentBuildState uses the current buildroot layout."""
        # Change to a future version.
        self.PatchObject(cbuildbot_launch, "BUILDROOT_BUILDROOT_LAYOUT", 22)

        options = cbuildbot_launch.PreParseArguments(
            ["--buildroot", self.root, "config"]
        )
        state = cbuildbot_launch.GetCurrentBuildState(options, "branchA")

        expected_state = build_summary.BuildSummary(
            status=constants.BUILDER_STATUS_INFLIGHT,
            buildroot_layout=22,
            branch="branchA",
        )
        self.assertEqual(state, expected_state)

    def testGetLastBuildStateNoFile(self):
        """Tests GetLastBuildState if the file is missing."""
        osutils.SafeMakedirs(self.root)
        state = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(state, build_summary.BuildSummary())

    def testGetLastBuildStateBadFile(self):
        """Tests GetLastBuildState if the file contains invalid JSON."""
        osutils.SafeMakedirs(self.root)
        osutils.WriteFile(self.previous_build_state, "}}")
        state = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(state, build_summary.BuildSummary())

    def testGetLastBuildStateMissingBuildStatus(self):
        """Tests GetLastBuildState if the file doesn't have a valid status."""
        osutils.SafeMakedirs(self.root)
        osutils.WriteFile(self.previous_build_state, '{"build_number": "3"}')
        state = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(state, build_summary.BuildSummary())

    def testGetLastBuildStateGoodFile(self):
        """Tests GetLastBuildState on a good file."""
        osutils.SafeMakedirs(self.root)
        osutils.WriteFile(
            self.previous_build_state,
            '{"build_number": 1, "master_build_id": 3, "status": "pass"}',
        )
        state = cbuildbot_launch.GetLastBuildState(self.root)
        self.assertEqual(
            state,
            build_summary.BuildSummary(
                build_number=1, master_build_id=3, status="pass"
            ),
        )

    def testSetLastBuildState(self):
        """Verifies that SetLastBuildState writes to the expected file."""
        osutils.SafeMakedirs(self.root)
        old_state = build_summary.BuildSummary(
            build_number=314,
            master_build_id=2178,
            status=constants.BUILDER_STATUS_PASSED,
        )
        cbuildbot_launch.SetLastBuildState(self.root, old_state)

        saved_state = osutils.ReadFile(self.previous_build_state)
        new_state = build_summary.BuildSummary()
        new_state.from_json(saved_state)

        self.assertEqual(old_state, new_state)

    def testCleanupChrootNoChroot(self):
        """Check CleanupChroot without a chroot."""
        self.StartPatcher(cros_test_lib.RunCommandMock())
        with mock.patch.object(cros_sdk_lib, "CleanupChrootMount"):
            cbuildbot_launch.CleanupChroot(self.buildroot)

    def testCleanupChrootNormal(self):
        """Check normal CleanupChroot."""
        osutils.SafeMakedirs(self.chroot)
        osutils.Touch(self.chroot + ".img")
        self.StartPatcher(cros_test_lib.RunCommandMock())
        with mock.patch.object(cros_sdk_lib, "CleanupChrootMount"):
            cbuildbot_launch.CleanupChroot(self.buildroot)

    def testCleanupChrootTimeout(self):
        """Check timeouts in CleanupChroot."""
        osutils.SafeMakedirs(self.chroot)
        osutils.Touch(self.chroot + ".img")
        rc_mock = self.StartPatcher(cros_test_lib.RunCommandMock())
        rc_mock.SetDefaultCmdResult()
        with mock.patch.object(
            cros_sdk_lib,
            "CleanupChrootMount",
            side_effect=timeout_util.TimeoutError,
        ):
            cbuildbot_launch.CleanupChroot(self.buildroot)