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BUG=b:233893248
TEST=CQ

Change-Id: I66591d7a738d241aed3290138c0f68065ab10a6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3879174
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
diff --git a/scripts/run_tests.py b/scripts/run_tests.py
index 1d48652..0c415a3 100644
--- a/scripts/run_tests.py
+++ b/scripts/run_tests.py
@@ -35,120 +35,127 @@
 
 
 def main(argv):
-  parser = get_parser()
-  opts = parser.parse_args()
-  opts.Freeze()
+    parser = get_parser()
+    opts = parser.parse_args()
+    opts.Freeze()
 
-  pytest_args = opts.pytest_args
+    pytest_args = opts.pytest_args
 
-  if opts.quick:
-    if not cros_build_lib.IsInsideChroot() and opts.chroot:
-      logging.warning('Tests start up faster when run from inside the chroot.')
+    if opts.quick:
+        if not cros_build_lib.IsInsideChroot() and opts.chroot:
+            logging.warning(
+                "Tests start up faster when run from inside the chroot."
+            )
 
-  if opts.chroot:
-    ensure_chroot_exists()
-    re_execute_inside_chroot(argv)
-  else:
-    pytest_args += ['--no-chroot']
+    if opts.chroot:
+        ensure_chroot_exists()
+        re_execute_inside_chroot(argv)
+    else:
+        pytest_args += ["--no-chroot"]
 
-  if opts.network:
-    pytest_args += ['-m', 'not network_test or network_test']
+    if opts.network:
+        pytest_args += ["-m", "not network_test or network_test"]
 
-  precache()
+    precache()
 
-  if opts.quick:
-    logging.info('Skipping test namespacing due to --quickstart.')
-    # Default to running in a single process under --quickstart. User args can
-    # still override this.
-    pytest_args = ['-n', '0'] + pytest_args
-  else:
-    # Namespacing is enabled by default because tests may break each other or
-    # interfere with parts of the running system if not isolated in a namespace.
-    # Disabling namespaces is not recommended for general use.
-    namespaces.ReExecuteWithNamespace(
-        [sys.argv[0]] + argv, network=opts.network)
+    if opts.quick:
+        logging.info("Skipping test namespacing due to --quickstart.")
+        # Default to running in a single process under --quickstart. User args can
+        # still override this.
+        pytest_args = ["-n", "0"] + pytest_args
+    else:
+        # Namespacing is enabled by default because tests may break each other or
+        # interfere with parts of the running system if not isolated in a namespace.
+        # Disabling namespaces is not recommended for general use.
+        namespaces.ReExecuteWithNamespace(
+            [sys.argv[0]] + argv, network=opts.network
+        )
 
-  # Check the environment.  https://crbug.com/1015450
-  st = os.stat('/')
-  if st.st_mode & 0o007 != 0o005:
-    cros_build_lib.Die(
-        f'The root directory has broken permissions: {st.st_mode:o}\n'
-        'Fix with: sudo chmod o+rx-w /')
-  if st.st_uid or st.st_gid:
-    cros_build_lib.Die(
-        f'The root directory has broken ownership: {st.st_uid}:{st.st_gid}'
-        ' (should be 0:0)\nFix with: sudo chown 0:0 /')
+    # Check the environment.  https://crbug.com/1015450
+    st = os.stat("/")
+    if st.st_mode & 0o007 != 0o005:
+        cros_build_lib.Die(
+            f"The root directory has broken permissions: {st.st_mode:o}\n"
+            "Fix with: sudo chmod o+rx-w /"
+        )
+    if st.st_uid or st.st_gid:
+        cros_build_lib.Die(
+            f"The root directory has broken ownership: {st.st_uid}:{st.st_gid}"
+            " (should be 0:0)\nFix with: sudo chown 0:0 /"
+        )
 
-  logging.debug('Running: pytest %s', cros_build_lib.CmdToStr(pytest_args))
-  sys.exit(pytest.main(pytest_args))
+    logging.debug("Running: pytest %s", cros_build_lib.CmdToStr(pytest_args))
+    sys.exit(pytest.main(pytest_args))
 
 
 def precache():
-  """Do some network-dependent stuff before we disallow network access."""
-  # This is a cheesy hack to make sure gsutil is populated in the cache before
-  # we run tests. This is a partial workaround for crbug.com/468838.
-  gs.GSContext.InitializeCache()
-  # Ensure protoc is installed for api/compile_build_api_proto_unittest.
-  compile_build_api_proto.InstallProtoc(
-      compile_build_api_proto.ProtocVersion.CHROMITE)
+    """Do some network-dependent stuff before we disallow network access."""
+    # This is a cheesy hack to make sure gsutil is populated in the cache before
+    # we run tests. This is a partial workaround for crbug.com/468838.
+    gs.GSContext.InitializeCache()
+    # Ensure protoc is installed for api/compile_build_api_proto_unittest.
+    compile_build_api_proto.InstallProtoc(
+        compile_build_api_proto.ProtocVersion.CHROMITE
+    )
 
 
 def re_execute_inside_chroot(argv):
-  """Re-execute the test wrapper inside the chroot."""
-  if cros_build_lib.IsInsideChroot():
-    return
+    """Re-execute the test wrapper inside the chroot."""
+    if cros_build_lib.IsInsideChroot():
+        return
 
-  target = os.path.join(constants.CHROMITE_DIR, 'scripts', 'run_tests')
-  relpath = os.path.relpath(target, '.')
-  # If we're in the scripts dir, make sure we always have a relative path,
-  # otherwise cros_sdk will search $PATH and fail.
-  if os.path.sep not in relpath:
-    relpath = os.path.join('.', relpath)
-  cmd = [
-      'cros_sdk',
-      '--working-dir', '.',
-      '--',
-      relpath,
-  ]
-  os.execvp(cmd[0], cmd + argv)
+    target = os.path.join(constants.CHROMITE_DIR, "scripts", "run_tests")
+    relpath = os.path.relpath(target, ".")
+    # If we're in the scripts dir, make sure we always have a relative path,
+    # otherwise cros_sdk will search $PATH and fail.
+    if os.path.sep not in relpath:
+        relpath = os.path.join(".", relpath)
+    cmd = [
+        "cros_sdk",
+        "--working-dir",
+        ".",
+        "--",
+        relpath,
+    ]
+    os.execvp(cmd[0], cmd + argv)
 
 
 def ensure_chroot_exists():
-  """Ensure that a chroot exists for us to run tests in."""
-  chroot = os.path.join(constants.SOURCE_ROOT, constants.DEFAULT_CHROOT_DIR)
-  if not os.path.exists(chroot) and not cros_build_lib.IsInsideChroot():
-    cros_build_lib.run(['cros_sdk', '--create'])
+    """Ensure that a chroot exists for us to run tests in."""
+    chroot = os.path.join(constants.SOURCE_ROOT, constants.DEFAULT_CHROOT_DIR)
+    if not os.path.exists(chroot) and not cros_build_lib.IsInsideChroot():
+        cros_build_lib.run(["cros_sdk", "--create"])
 
 
 def get_parser():
-  """Build the parser for command line arguments."""
-  parser = commandline.ArgumentParser(
-      description=__doc__,
-      epilog='To see the help output for pytest:\n$ %(prog)s -- --help',
-  )
-  parser.add_argument(
-      '--quickstart',
-      dest='quick',
-      action='store_true',
-      help='Skip normal test sandboxing and namespacing for faster start up '
-      'time.',
-  )
-  parser.add_argument(
-      '--network',
-      action='store_true',
-      help='Include network tests.',
-  )
-  parser.add_argument(
-      '--no-chroot',
-      dest='chroot',
-      action='store_false',
-      help="Don't initialize or enter a chroot for the test invocation. May "
-      'cause tests to unexpectedly fail!',
-  )
-  parser.add_argument(
-      'pytest_args',
-      metavar='pytest arguments',
-      nargs='*',
-      help='Arguments to pass down to pytest (use -- to help separate)',
-  )
-  return parser
+    """Build the parser for command line arguments."""
+    parser = commandline.ArgumentParser(
+        description=__doc__,
+        epilog="To see the help output for pytest:\n$ %(prog)s -- --help",
+    )
+    parser.add_argument(
+        "--quickstart",
+        dest="quick",
+        action="store_true",
+        help="Skip normal test sandboxing and namespacing for faster start up "
+        "time.",
+    )
+    parser.add_argument(
+        "--network",
+        action="store_true",
+        help="Include network tests.",
+    )
+    parser.add_argument(
+        "--no-chroot",
+        dest="chroot",
+        action="store_false",
+        help="Don't initialize or enter a chroot for the test invocation. May "
+        "cause tests to unexpectedly fail!",
+    )
+    parser.add_argument(
+        "pytest_args",
+        metavar="pytest arguments",
+        nargs="*",
+        help="Arguments to pass down to pytest (use -- to help separate)",
+    )
+    return parser