70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
# -*- coding: utf-8 -*- #
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# Copyright 2017 Google LLC. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Decide whether launching a browser is a good idea."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import unicode_literals
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import os
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from googlecloudsdk.core.util import encoding
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from googlecloudsdk.core.util import platforms
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# These are environment variables that can indicate a running compositor on
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# Linux.
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_DISPLAY_VARIABLES = ['DISPLAY', 'WAYLAND_DISPLAY', 'MIR_SOCKET']
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# A list of results for webbrowser.get().name that indicate we should not
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# attempt to open a web browser for the user.
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_WEBBROWSER_NAMES_BLOCKLIST = [
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'www-browser',
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]
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def ShouldLaunchBrowser(attempt_launch_browser):
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"""Determines if a browser can be launched.
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Args:
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attempt_launch_browser: bool, True to launch a browser if it's possible in
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the user's environment; False to not even try.
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Returns:
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True if the tool should actually launch a browser, based on user preference
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and environment.
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"""
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import webbrowser # pylint:disable=g-import-not-at-top, For performance.
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# Sometimes it's not possible to launch the web browser. This often
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# happens when people ssh into other machines.
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launch_browser = attempt_launch_browser
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if launch_browser:
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current_os = platforms.OperatingSystem.Current()
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if (current_os is platforms.OperatingSystem.LINUX and
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not any(encoding.GetEncodedValue(os.environ, var) for var
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in _DISPLAY_VARIABLES)):
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launch_browser = False
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try:
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browser = webbrowser.get()
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if (hasattr(browser, 'name')
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and browser.name in _WEBBROWSER_NAMES_BLOCKLIST):
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launch_browser = False
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except webbrowser.Error:
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launch_browser = False
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return launch_browser
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