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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/virtualenv_wrapper.py b/scripts/virtualenv_wrapper.py
index e28afe6..46ed1e5 100755
--- a/scripts/virtualenv_wrapper.py
+++ b/scripts/virtualenv_wrapper.py
@@ -11,93 +11,104 @@
 
 
 try:
-  import pytest  # pylint: disable=import-error
-  wrapper3 = pytest.importorskip('wrapper3', reason='File must be run in venv')
+    import pytest  # pylint: disable=import-error
+
+    wrapper3 = pytest.importorskip(
+        "wrapper3", reason="File must be run in venv"
+    )
 except ImportError:
-  import wrapper3
+    import wrapper3
 
 _CHROMITE_DIR = os.path.realpath(
-    os.path.join(os.path.abspath(__file__), '..', '..'))
+    os.path.join(os.path.abspath(__file__), "..", "..")
+)
 
 # _VIRTUALENV_DIR contains the scripts for working with venvs
-_VIRTUALENV_DIR = os.path.join(_CHROMITE_DIR, '..', 'infra_virtualenv')
-_CREATE_VENV_PATH = os.path.join(_VIRTUALENV_DIR, 'bin', 'create_venv3')
-_REQUIREMENTS = os.path.join(_CHROMITE_DIR, 'venv', 'requirements.txt')
+_VIRTUALENV_DIR = os.path.join(_CHROMITE_DIR, "..", "infra_virtualenv")
+_CREATE_VENV_PATH = os.path.join(_VIRTUALENV_DIR, "bin", "create_venv3")
+_REQUIREMENTS = os.path.join(_CHROMITE_DIR, "venv", "requirements.txt")
 
-_VENV_MARKER = 'INSIDE_CHROMITE_VENV'
+_VENV_MARKER = "INSIDE_CHROMITE_VENV"
 
 
 def main():
-  if _IsInsideVenv(os.environ):
-    # Don't bleed the marker into children processes that might use the wrapper
-    # themselves to run inside of the virtualenv.
-    os.environ.pop(_VENV_MARKER)
-    wrapper3.DoMain()
-  else:
-    venvdir = _CreateVenv()
-    _ExecInVenv(venvdir, sys.argv)
+    if _IsInsideVenv(os.environ):
+        # Don't bleed the marker into children processes that might use the wrapper
+        # themselves to run inside of the virtualenv.
+        os.environ.pop(_VENV_MARKER)
+        wrapper3.DoMain()
+    else:
+        venvdir = _CreateVenv()
+        _ExecInVenv(venvdir, sys.argv)
 
 
 def _CreateVenv():
-  """Create or update chromite venv."""
-  result = subprocess.run(
-      [_CREATE_VENV_PATH, _REQUIREMENTS],
-      check=False, stdout=subprocess.PIPE, encoding='utf-8')
-  if result.returncode:
-    print(f'{os.path.basename(sys.argv[0])}: error: {" ".join(result.args)}: '
-          f'exited {result.returncode}', file=sys.stderr)
-    sys.exit(result.returncode)
-  return result.stdout.strip()
+    """Create or update chromite venv."""
+    result = subprocess.run(
+        [_CREATE_VENV_PATH, _REQUIREMENTS],
+        check=False,
+        stdout=subprocess.PIPE,
+        encoding="utf-8",
+    )
+    if result.returncode:
+        print(
+            f'{os.path.basename(sys.argv[0])}: error: {" ".join(result.args)}: '
+            f"exited {result.returncode}",
+            file=sys.stderr,
+        )
+        sys.exit(result.returncode)
+    return result.stdout.strip()
 
 
 def _ExecInVenv(venvdir, args):
-  """Exec command in chromite venv.
+    """Exec command in chromite venv.
 
-  Args:
-    venvdir: virtualenv directory
-    args: Sequence of arguments.
-  """
-  venv_python = os.path.join(venvdir, 'bin', 'python')
-  os.execve(
-      venv_python,
-      [venv_python] + list(args),
-      _CreateVenvEnvironment(os.environ))
+    Args:
+      venvdir: virtualenv directory
+      args: Sequence of arguments.
+    """
+    venv_python = os.path.join(venvdir, "bin", "python")
+    os.execve(
+        venv_python,
+        [venv_python] + list(args),
+        _CreateVenvEnvironment(os.environ),
+    )
 
 
 def _CreateVenvEnvironment(env_dict):
-  """Create environment for a virtualenv.
+    """Create environment for a virtualenv.
 
-  This adds a special marker variable to a copy of the input environment dict
-  and returns the copy.
+    This adds a special marker variable to a copy of the input environment dict
+    and returns the copy.
 
-  Args:
-    env_dict: Environment variable dict to use as base, which is not modified.
+    Args:
+      env_dict: Environment variable dict to use as base, which is not modified.
 
-  Returns:
-    New environment dict for a virtualenv.
-  """
-  new_env_dict = env_dict.copy()
-  new_env_dict[_VENV_MARKER] = '1'
-  new_env_dict.pop('PYTHONPATH', None)
-  return new_env_dict
+    Returns:
+      New environment dict for a virtualenv.
+    """
+    new_env_dict = env_dict.copy()
+    new_env_dict[_VENV_MARKER] = "1"
+    new_env_dict.pop("PYTHONPATH", None)
+    return new_env_dict
 
 
 def _IsInsideVenv(env_dict):
-  """Return whether the environment dict is running inside a virtualenv.
+    """Return whether the environment dict is running inside a virtualenv.
 
-  This checks the environment dict for the special marker added by
-  _CreateVenvEnvironment().
+    This checks the environment dict for the special marker added by
+    _CreateVenvEnvironment().
 
-  Args:
-    env_dict: Environment variable dict to check
+    Args:
+      env_dict: Environment variable dict to check
 
-  Returns:
-    A true value if inside virtualenv, else a false value.
-  """
-  # Checking sys.prefix or doing any kind of path check is unreliable because
-  # we check out chromite to weird places.
-  return env_dict.get(_VENV_MARKER, '')
+    Returns:
+      A true value if inside virtualenv, else a false value.
+    """
+    # Checking sys.prefix or doing any kind of path check is unreliable because
+    # we check out chromite to weird places.
+    return env_dict.get(_VENV_MARKER, "")
 
 
-if __name__ == '__main__':
-  main()
+if __name__ == "__main__":
+    main()