55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
# Copyright 2015 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""This module provides some utilities used by LXC and its tools.
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"""
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import common
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from autotest_lib.client.bin import utils
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from autotest_lib.client.common_lib import error
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from autotest_lib.client.common_lib.cros.network import interface
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def path_exists(path):
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"""Check if path exists.
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If the process is not running with root user, os.path.exists may fail to
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check if a path owned by root user exists. This function uses command
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`test -e` to check if path exists.
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@param path: Path to check if it exists.
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@return: True if path exists, otherwise False.
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"""
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try:
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utils.run('sudo test -e "%s"' % path)
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return True
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except error.CmdError:
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return False
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def get_host_ip():
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"""Get the IP address of the host running containers on lxcbr*.
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This function gets the IP address on network interface lxcbr*. The
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assumption is that lxc uses the network interface started with "lxcbr".
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@return: IP address of the host running containers.
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"""
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# The kernel publishes symlinks to various network devices in /sys.
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result = utils.run('ls /sys/class/net', ignore_status=True)
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# filter out empty strings
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interface_names = [x for x in result.stdout.split() if x]
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lxc_network = None
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for name in interface_names:
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if name.startswith('lxcbr'):
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lxc_network = name
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break
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if not lxc_network:
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raise error.ContainerError('Failed to find network interface used by '
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'lxc. All existing interfaces are: %s' %
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interface_names)
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netif = interface.Interface(lxc_network)
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return netif.ipv4_address
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