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Copy pathterm.py
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60 lines (53 loc) · 1.91 KB
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"""
Terminal creation and cleanup.
Utility functions to run a term (connected via screen(1)) on each host.
Requires GNU screen(1) and xterm(1).
Optionally uses gnome-terminal.
"""
import re
from subprocess import Popen
from mininet.log import error
from mininet.util import quietRun
def quoteArg( arg ):
"Quote an argument if it contains spaces."
return repr( arg ) if ' ' in arg else arg
def makeTerm( node, title='Node', term='xterm' ):
"""Run screen on a node, and hook up a terminal.
node: Node object
title: base title
term: 'xterm' or 'gterm'
returns: process created"""
title += ': ' + node.name
if not node.inNamespace:
title += ' (root)'
cmds = {
'xterm': [ 'xterm', '-title', title, '-e' ],
'gterm': [ 'gnome-terminal', '--title', title, '-e' ]
}
if term not in cmds:
error( 'invalid terminal type: %s' % term )
return
if not node.execed:
node.cmd( 'screen -dmS ' + 'mininet.' + node.name)
args = [ 'screen', '-D', '-RR', '-S', 'mininet.' + node.name ]
else:
args = [ 'sh', '-c', 'exec tail -f /tmp/' + node.name + '*.log' ]
if term == 'gterm':
# Compress these for gnome-terminal, which expects one token
# to follow the -e option
args = [ ' '.join( [ quoteArg( arg ) for arg in args ] ) ]
return Popen( cmds[ term ] + args )
def cleanUpScreens():
"Remove moldy old screen sessions."
r = r'(\d+\.mininet\.[hsc]\d+)'
output = quietRun( 'screen -ls' ).split( '\n' )
for line in output:
m = re.search( r, line )
if m:
quietRun( 'screen -S ' + m.group( 1 ) + ' -X quit' )
def makeTerms( nodes, title='Node', term='xterm' ):
"""Create terminals.
nodes: list of Node objects
title: base title for each
returns: list of created terminal processes"""
return [ makeTerm( node, title, term ) for node in nodes ]