Use /usr/bin/env python for virtualenv (#1025)

This helps with virtualenv although it can open
up another security hole if you end up using an
unexpected python interpreter.

Overall it seems to make sense to err on the side
of usability but it's good to be aware of security.

However, for the remaining utility scripts that require
python 2, we explicitly note this with #!/usr/bin/python2.

bin/mn

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Mininet runner

examples/baresshd.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 "This example doesn't use OpenFlow, but attempts to run sshd in a namespace."
 

examples/bind.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 bind.py: Bind mount example

examples/cluster.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 cluster.py: prototyping/experimentation for distributed Mininet,

examples/clustercli.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 "CLI for Mininet Cluster Edition prototype demo"
 

examples/clusterdemo.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 "clusterdemo.py: demo of Mininet Cluster Edition prototype"
 

examples/clusterperf.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 "clusterperf.py compare the maximum throughput between SSH and GRE tunnels"
 

examples/consoles.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 consoles.py: bring up a bunch of miniature consoles on a virtual network

examples/controllers.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Create a network where different switches are connected to

examples/controllers2.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 This example creates a multi-controller network from semi-scratch by

examples/controlnet.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 controlnet.py: Mininet with a custom control network

examples/cpu.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 cpu.py: test iperf bandwidth for varying cpu limits

examples/emptynet.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 This example shows how to create an empty Mininet object

examples/hwintf.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 This example shows how to add an interface (for example a real

examples/intfoptions.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 '''
 example of using various TCIntf options.

examples/limit.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 limit.py: example of using link and CPU limits

examples/linearbandwidth.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Test bandwidth (using iperf) on linear networks of varying size,

examples/linuxrouter.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 linuxrouter.py: Example network with Linux IP router

examples/miniedit.py

@@ -1704,7 +1704,7 @@ class MiniEdit( Frame ):
             # debug( "Now saving under %s\n" % fileName )
             f = open(fileName, 'wb')
 
-            f.write("#!/usr/bin/python\n")
+            f.write("#!/usr/bin/env python\n")
             f.write("\n")
             f.write("from mininet.net import Mininet\n")
             f.write("from mininet.node import Controller, RemoteController, OVSController\n")

examples/mobility.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Simple example of Mobility with Mininet

examples/multilink.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 This is a simple example that demonstrates multiple links

examples/multiping.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 multiping.py: monitor multiple sets of hosts using ping

examples/multipoll.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Simple example of sending output to multiple files and

examples/multitest.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 This example shows how to create a network and run multiple tests.

examples/nat.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Example to create a Mininet topology and connect it to the internet via NAT

examples/natnet.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 natnet.py: Example network with NATs

examples/numberedports.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Create a network with 5 hosts, numbered 1-4 and 9.

examples/popen.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 This example monitors a number of hosts using host.popen() and

examples/popenpoll.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 "Monitor multiple hosts using popen()/pmonitor()"
 

examples/scratchnet.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Build a simple network from scratch, using mininet primitives.

examples/scratchnetuser.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Build a simple network from scratch, using mininet primitives.

examples/simpleperf.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Simple example of setting network and CPU parameters

examples/sshd.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Create a network and start sshd(8) on each host.

examples/tree1024.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 """
 Create a 1024-host network, and run the CLI on it.

examples/treeping64.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 "Create a 64-node tree network, and test connectivity using ping."
 

util/doxify.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 
 """
 Convert simple documentation to epydoc/pydoctor-compatible markup
@@ -83,7 +83,3 @@ if __name__ == '__main__':
     infile.close()
     os.close( outfid )
     call( [ 'doxypy', outname ] )
-
-
-
-

util/unpep8

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 
 """
 Translate from PEP8 Python style to Mininet (i.e. Arista-like)

util/versioncheck.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 from subprocess import check_output as co
 from sys import exit, version_info

util/vm/build.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python2.7
+#!/usr/bin/python2
 
 """
 build.py: build a Mininet VM