Problem getting cloud-init part handler to run

userdata

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package {'tree': ensure => installed}

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#!/bin/sh -eu
pwd
apt-get --quiet update
apt-get --quiet --yes install puppet
puppet apply /tmp/bootstrap.pp

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#part-handler

def list_types():
    return(["text/plain"])

def handle_part(data, ctype, filename, payload):
    if ctype == "__begin__":
       return
    if ctype == "__end__":
       return

    print "&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& here I am!"
    with open('/tmp/'+filename, 'w') as f:
        f.write(payload)

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