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-rw-r--r--llvm_tools/assert_not_in_chroot.py24
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diff --git a/llvm_tools/assert_not_in_chroot.py b/llvm_tools/assert_not_in_chroot.py
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+++ b/llvm_tools/assert_not_in_chroot.py
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+# -*- coding: utf-8 -*-
+# Copyright 2019 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Helper module to determine whether a script is executed inside the chroot."""
+
+from __future__ import print_function
+
+import os
+
+
+def VerifyOutsideChroot():
+ """Checks whether the script invoked was executed in the chroot.
+
+ Raises:
+ AssertionError: The script was run inside the chroot.
+ """
+
+ chroot_only_path = '/mnt/host/depot_tools'
+
+ in_chroot_err_message = 'Script should be run outside the chroot.'
+
+ assert not os.path.isdir(chroot_only_path), in_chroot_err_message