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# Copyright (c) 2019 Cisco and/or its affiliates.
# 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
# limitations under the License.
"""Linux namespace utilities library."""
from resources.libraries.python.ssh import exec_cmd_no_error, exec_cmd
class Namespaces:
"""Linux namespace utilities."""
def __init__(self):
self._namespaces = []
def create_namespace(self, node, namespace_name):
"""Create namespace and add the name to the list for later clean-up.
:param node: Where to create namespace.
:param namespace_name: Name for namespace.
:type node: dict
:type namespace_name: str
"""
cmd = f"ip netns add {namespace_name}"
exec_cmd_no_error(node, cmd, sudo=True)
self._namespaces.append(namespace_name)
@staticmethod
def attach_interface_to_namespace(node, namespace, interface):
"""Attach specific interface to namespace.
:param node: Node where to execute command.
:param namespace: Namespace to execute command on.
:param interface: Interface in namespace.
:type node: dict
:type namespace: str
:type interface: str
:raises RuntimeError: Interface could not be attached.
"""
cmd = f"ip link set {interface} netns {namespace}"
ret_code, _, stderr = exec_cmd(node, cmd, timeout=5, sudo=True)
if ret_code != 0:
raise RuntimeError(f"Could not attach interface, reason:\n{stderr}")
cmd = f"ip netns exec {namespace} ip link set {interface} up"
ret_code, _, stderr = exec_cmd(node, cmd, timeout=5, sudo=True)
if ret_code != 0:
raise RuntimeError(
f"Could not set interface state, reason:\n{stderr}"
)
@staticmethod
def create_bridge_for_int_in_namespace(
node, namespace, bridge_name, *interfaces):
"""Setup bridge domain and add interfaces to it.
:param node: Node where to execute command.
:param namespace: Namespace to execute command on.
:param bridge_name: Name of the bridge to be created.
:param interfaces: List of interfaces to add to the namespace.
:type node: dict
:type namespace: str
:type bridge_name: str
:type interfaces: list
"""
cmd = f"ip netns exec {namespace} brctl addbr {bridge_name}"
exec_cmd_no_error(node, cmd, sudo=True)
for interface in interfaces:
cmd = f"ip netns exec {namespace} brctl addif {bridge_name} " \
f"{interface}"
exec_cmd_no_error(node, cmd, sudo=True)
cmd = f"ip netns exec {namespace} ip link set dev {bridge_name} up"
exec_cmd_no_error(node, cmd, sudo=True)
def clean_up_namespaces(self, node):
"""Remove all old namespaces.
:param node: Node where to execute command.
:type node: dict
:raises RuntimeError: Namespaces could not be cleaned properly.
"""
for namespace in self._namespaces:
print(f"Cleaning namespace {namespace}")
cmd = f"ip netns delete {namespace}"
ret_code, _, _ = exec_cmd(node, cmd, timeout=5, sudo=True)
if ret_code != 0:
raise RuntimeError(u"Could not delete namespace")
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