mirror of https://github.com/torvalds/linux.git
248 lines
7.5 KiB
Python
248 lines
7.5 KiB
Python
import os
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import signal
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from string import Template
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import subprocess
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import time
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from multiprocessing import Pool
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from functools import cached_property
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from TdcPlugin import TdcPlugin
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from tdc_config import *
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def prepare_suite(obj, test):
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original = obj.args.NAMES
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if 'skip' in test and test['skip'] == 'yes':
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return
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if 'nsPlugin' not in test['plugins']:
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return
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shadow = {}
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shadow['IP'] = original['IP']
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shadow['TC'] = original['TC']
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shadow['NS'] = '{}-{}'.format(original['NS'], test['random'])
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shadow['DEV0'] = '{}id{}'.format(original['DEV0'], test['id'])
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shadow['DEV1'] = '{}id{}'.format(original['DEV1'], test['id'])
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shadow['DUMMY'] = '{}id{}'.format(original['DUMMY'], test['id'])
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shadow['DEV2'] = original['DEV2']
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obj.args.NAMES = shadow
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if obj.args.namespace:
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obj._ns_create()
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else:
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obj._ports_create()
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# Make sure the netns is visible in the fs
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while True:
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obj._proc_check()
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try:
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ns = obj.args.NAMES['NS']
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f = open('/run/netns/{}'.format(ns))
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f.close()
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break
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except:
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time.sleep(0.1)
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continue
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obj.args.NAMES = original
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class SubPlugin(TdcPlugin):
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def __init__(self):
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self.sub_class = 'ns/SubPlugin'
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super().__init__()
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def pre_suite(self, testcount, testlist):
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from itertools import cycle
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super().pre_suite(testcount, testlist)
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print("Setting up namespaces and devices...")
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with Pool(self.args.mp) as p:
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it = zip(cycle([self]), testlist)
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p.starmap(prepare_suite, it)
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def pre_case(self, caseinfo, test_skip):
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if self.args.verbose:
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print('{}.pre_case'.format(self.sub_class))
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if test_skip:
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return
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def post_case(self):
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if self.args.verbose:
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print('{}.post_case'.format(self.sub_class))
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if self.args.namespace:
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self._ns_destroy()
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else:
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self._ports_destroy()
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def post_suite(self, index):
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if self.args.verbose:
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print('{}.post_suite'.format(self.sub_class))
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# Make sure we don't leak resources
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for f in os.listdir('/run/netns/'):
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cmd = self._replace_keywords("$IP netns del {}".format(f))
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if self.args.verbose > 3:
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print('_exec_cmd: command "{}"'.format(cmd))
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subprocess.run(cmd, shell=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
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def add_args(self, parser):
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super().add_args(parser)
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self.argparser_group = self.argparser.add_argument_group(
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'netns',
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'options for nsPlugin(run commands in net namespace)')
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self.argparser_group.add_argument(
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'-N', '--no-namespace', action='store_false', default=True,
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dest='namespace', help='Don\'t run commands in namespace')
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return self.argparser
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def adjust_command(self, stage, command):
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super().adjust_command(stage, command)
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cmdform = 'list'
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cmdlist = list()
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if not self.args.namespace:
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return command
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if self.args.verbose:
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print('{}.adjust_command'.format(self.sub_class))
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if not isinstance(command, list):
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cmdform = 'str'
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cmdlist = command.split()
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else:
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cmdlist = command
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if stage == 'setup' or stage == 'execute' or stage == 'verify' or stage == 'teardown':
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if self.args.verbose:
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print('adjust_command: stage is {}; inserting netns stuff in command [{}] list [{}]'.format(stage, command, cmdlist))
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cmdlist.insert(0, self.args.NAMES['NS'])
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cmdlist.insert(0, 'exec')
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cmdlist.insert(0, 'netns')
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cmdlist.insert(0, self.args.NAMES['IP'])
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else:
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pass
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if cmdform == 'str':
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command = ' '.join(cmdlist)
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else:
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command = cmdlist
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if self.args.verbose:
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print('adjust_command: return command [{}]'.format(command))
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return command
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def _ports_create_cmds(self):
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cmds = []
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cmds.append(self._replace_keywords('link add $DEV0 type veth peer name $DEV1'))
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cmds.append(self._replace_keywords('link set $DEV0 up'))
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cmds.append(self._replace_keywords('link add $DUMMY type dummy'))
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if not self.args.namespace:
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cmds.append(self._replace_keywords('link set $DEV1 up'))
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return cmds
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def _ports_create(self):
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self._exec_cmd_batched('pre', self._ports_create_cmds())
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def _ports_destroy_cmd(self):
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return self._replace_keywords('link del $DEV0')
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def _ports_destroy(self):
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self._exec_cmd('post', self._ports_destroy_cmd())
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def _ns_create_cmds(self):
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cmds = []
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if self.args.namespace:
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ns = self.args.NAMES['NS']
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cmds.append(self._replace_keywords('netns add {}'.format(ns)))
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cmds.append(self._replace_keywords('link set $DEV1 netns {}'.format(ns)))
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cmds.append(self._replace_keywords('link set $DUMMY netns {}'.format(ns)))
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cmds.append(self._replace_keywords('netns exec {} $IP link set $DEV1 up'.format(ns)))
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cmds.append(self._replace_keywords('netns exec {} $IP link set $DUMMY up'.format(ns)))
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if self.args.device:
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cmds.append(self._replace_keywords('link set $DEV2 netns {}'.format(ns)))
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cmds.append(self._replace_keywords('netns exec {} $IP link set $DEV2 up'.format(ns)))
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return cmds
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def _ns_create(self):
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'''
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Create the network namespace in which the tests will be run and set up
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the required network devices for it.
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'''
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self._ports_create()
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self._exec_cmd_batched('pre', self._ns_create_cmds())
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def _ns_destroy_cmd(self):
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return self._replace_keywords('netns delete {}'.format(self.args.NAMES['NS']))
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def _ns_destroy(self):
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'''
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Destroy the network namespace for testing (and any associated network
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devices as well)
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'''
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if self.args.namespace:
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self._exec_cmd('post', self._ns_destroy_cmd())
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self._ports_destroy()
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@cached_property
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def _proc(self):
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ip = self._replace_keywords("$IP -b -")
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proc = subprocess.Popen(ip,
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shell=True,
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stdin=subprocess.PIPE,
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env=ENVIR)
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return proc
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def _proc_check(self):
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proc = self._proc
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proc.poll()
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if proc.returncode is not None and proc.returncode != 0:
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raise RuntimeError("iproute2 exited with an error code")
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def _exec_cmd(self, stage, command):
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'''
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Perform any required modifications on an executable command, then run
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it in a subprocess and return the results.
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'''
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if self.args.verbose > 3:
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print('_exec_cmd: command "{}"'.format(command))
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proc = self._proc
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proc.stdin.write((command + '\n').encode())
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proc.stdin.flush()
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if self.args.verbose > 3:
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print('_exec_cmd proc: {}'.format(proc))
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self._proc_check()
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def _exec_cmd_batched(self, stage, commands):
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for cmd in commands:
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self._exec_cmd(stage, cmd)
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def _replace_keywords(self, cmd):
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"""
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For a given executable command, substitute any known
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variables contained within NAMES with the correct values
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"""
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tcmd = Template(cmd)
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subcmd = tcmd.safe_substitute(self.args.NAMES)
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return subcmd
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