Add xterm support

mininet/xterm.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+"""XTerm creation and cleanup.
+
+Utility functions to run an xterm (connected via screen(1)) on each host.
+
+Requires xterm(1) and GNU screen(1).
+"""
+
+import os
+import re
+from subprocess import Popen
+
+from mininet.util import quietRun
+
+def makeXterm(node, title):
+    '''Run screen on a node, and hook up an xterm.
+
+    @param node Node object
+    @param title base title
+    @return process created
+    '''
+    title += ': ' + node.name
+    if not node.inNamespace:
+        title += ' (root)'
+    cmd = ['xterm', '-title', title, '-e']
+    if not node.execed:
+        node.cmdPrint('screen -dmS ' + node.name)
+        cmd += ['screen', '-D', '-RR', '-S', node.name]
+    else:
+        cmd += ['sh', '-c', 'exec tail -f /tmp/' + node.name + '*.log']
+    return Popen(cmd)
+
+
+def cleanUpScreens():
+    '''Remove moldy old screen sessions.'''
+    r = r'(\d+.[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 kill')
+
+
+def makeXterms(nodes, title):
+    '''Create XTerms.
+
+    @param nodes list of Node objects
+    @param title base title for each
+    @return list of created xterm processes
+    '''
+    return [makeXterm(node, title) for node in nodes]