NePA TesT: Community Network Emulator

import re

from mininet.util import quietRun

def sh( cmd ): 

   "Print a command and send it to the shell"

   print cmd

   return Popen( [ '/bin/sh', '-c', cmd ], 

      stdout=PIPE ).communicate()[ 0 ]

   """Clean up junk which might be left over from old runs;

      do fast stuff before slow dp and link removal!"""

   print "*** Removing excess controllers/ofprotocols/ofdatapaths/pings/noxes"

   zombies = 'controller ofprotocol ofdatapath ping nox_core lt-nox_core '

   zombies += 'udpbwtest'

   # Note: real zombie processes can't actually be killed, since they 

   # are already (un)dead. Then again,

   # you can't connect to them either, so they're mostly harmless.

   sh( 'killall -9 ' + zombies + ' 2> /dev/null' )

   print "*** Removing junk from /tmp"

   sh( 'rm -f /tmp/vconn* /tmp/vlogs* /tmp/*.out /tmp/*.log' )

   print "*** Removing old screen sessions"

   cleanUpScreens()

   print "*** Removing excess kernel datapaths"

   dps = sh( "ps ax | egrep -o 'dp[0-9]+' | sed 's/dp/nl:/'" ).split( '\n')

   for dp in dps: 

      if dp != '': sh( 'dpctl deldp ' + dp )

   print "*** Removing all links of the pattern foo-ethX"

   links = sh( "ip link show | egrep -o '(\w+-eth\w+)'" ).split( '\n' )

   for link in links: 

      if link != '': sh( "ip link del " + link )

   print "*** Cleanup complete."

   cleanup()