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#!/usr/bin/python
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"""
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bind.py: Bind mount example
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This creates hosts with private directories that the user specifies.
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These hosts may have persistent directories that will be available
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across multiple mininet session, or temporary directories that will
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only last for one mininet session. To specify a persistent
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directory, add a tuple to a list of private directories:
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    [ ( 'directory to be mounted on', 'directory to be mounted' ) ]
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String expansion may be used to create a directory template for
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each host. To do this, add a %(name)s in place of the host name
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when creating your list of directories:
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    [ ( '/var/run', '/tmp/%(name)s/var/run' ) ]
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If no persistent directory is specified, the directories will default
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to temporary private directories. To do this, simply create a list of
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directories to be made private. A tmpfs will then be mounted on them.
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You may use both temporary and persistent directories at the same
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time. In the following privateDirs string, each host will have a 
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persistent directory in the root filesystem at
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"/tmp/(hostname)/var/run" mounted on "/var/run". Each host will also
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have a temporary private directory mounted on "/var/log".
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    [ ( '/var/run', '/tmp/%(name)s/var/run' ), '/var/log' ]
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This example has both persistent directories mounted on '/var/log'
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and '/var/run'. It also has a temporary private directory mounted
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on '/var/mn'
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"""
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from mininet.net import Mininet
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from mininet.node import Host
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from mininet.cli import CLI
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from mininet.topo import SingleSwitchTopo
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from mininet.log import setLogLevel, info
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from functools import partial
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# Sample usage
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def testHostWithPrivateDirs():
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    "Test bind mounts"
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    topo = SingleSwitchTopo( 10 )
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    privateDirs = [ ( '/var/log', '/tmp/%(name)s/var/log' ), 
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                    ( '/var/run', '/tmp/%(name)s/var/run' ), 
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                      '/var/mn' ]
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    host = partial( Host,
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                    privateDirs=privateDirs )
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    net = Mininet( topo=topo, host=host )
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    net.start()
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    directories = [ directory[ 0 ] if isinstance( directory, tuple )
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                    else directory for directory in privateDirs ]
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    info( 'Private Directories:',  directories, '\n' )
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    CLI( net )
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    net.stop()
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if __name__ == '__main__':
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    setLogLevel( 'info' )
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    testHostWithPrivateDirs()
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    info( 'Done.\n')
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