# -*- coding: utf-8 -*- #
# Copyright 2015 Google LLC. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
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"""Supplementary help for gcloud startup options."""

from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals

from googlecloudsdk.calliope import base


class Startup(base.TopicCommand):
  """Supplementary help for gcloud startup options.


  # Choosing a Python Interpreter

  The `gcloud` CLI runs under Python. Note that `gcloud` requires Python version
  3.5-3.9. Certain Windows and Linux installs include a bundled Python
  interpreter depending on the package and architecture. Similarly, Intel-based
  Macs offer the option to install CPython as part of the main install script.
  Otherwise, you must have a Python interpreter available on your system. The
  `gcloud` CLI will attempt to locate an interpreter on your system PATH by
  looking for the following binaries:

      * python3
      * python

  If you have a bundled Python installed, it will be preferred. To override this
  you will need to set the `CLOUDSDK_PYTHON` environment variable, see below.

  Other Python tools shipped in the Google Cloud CLI do not support Python 3 and
  require Python 2.7.x, including:

      * `dev_appserver`

  # Bundled Python on Linux

  Linux-based installs include a bundled Python installation on x86_64
  architectures. This installation will be used by default. If you want to use a
  different Python installation, set the `CLOUDSDK_PYTHON` environment variable
  to the absolute path to your python interpreter.

  If you have multiple Python interpreters available (including a bundled
  python) or if you don't have one on your PATH, you can specify which
  interpreter to use by setting the `CLOUDSDK_PYTHON` environment variable. For
  example:

    # Use the python3 interpreter on your path
    $ export CLOUDSDK_PYTHON=python3


    # Use a python you have installed in a special location
    $ export CLOUDSDK_PYTHON=/usr/local/my-custom-python-install/python

  `gsutil` versions 5.0 and onward support Python 3.5-3.8. To use a different
  interpreter for `gsutil` than for the other Python tools, set the
  `CLOUDSDK_GSUTIL_PYTHON` environment variable to the desired interpreter.

  `bq` now supports Python 3.5-3.8. To use a different interpreter for `bq` than
   or the other Python tools, you can set the desired interpreter by setting the
   `CLOUDSDK_BQ_PYTHON` environment variable.

  # Configuring the Python Interpreter

  While not typically necessary, you are able to pass interpreter level
  arguments to the Python running `gcloud` via the `CLOUDSDK_PYTHON_ARGS`
  environment variable.

  A common use case for this (which has been special-cased) is to enable
  'site packages'. This allows Python to pick up libraries from the system (
  for example, those that may have been installed with `pip`). Site packages may
  be necessary if you require certain native libraries (as is the case if you
  work with service accounts using a legacy `.p12` key, for example). To enable
  site packages, set `CLOUDSDK_PYTHON_SITEPACKAGES=1`. Note that enabling site
  packages may cause conflicts with `gcloud` packaged libraries, depending on
  what you have installed on your system.


  # Setting Configurations and Properties

  Your active configuration can also be set via the environment variable
  `CLOUDSDK_ACTIVE_CONFIG_NAME`. This allows you to specify a certain
  configuration in a given terminal session without changing the global
  default configuration.

  In addition to being able to set them via `gcloud config set`,
  each `gcloud` property has a corresponding environment variable. They take
  the form: `CLOUDSDK_SECTION_PROPERTY`. For example, if you wanted to
  change your active project for just one terminal you could run:

    $ export CLOUDSDK_CORE_PROJECT=my-project

  For more information, see `gcloud topic configurations`.
  """
