Puppet users - Feb 2014 - Please help with control/ordering issue

Hi, im trying to work some logic into a puppet class and I'm not sure the 
best way to do it.  For this application, I have an installation phase, a 
setup phase, and then a maintenance phase.

My current method of maintaining this is to call the relevant subclass 
using "include".  I then  have to go comment out two of the 3 includes
depending on which phase i'm on.  This of course means that I have to shut 
off puppet on all the nodes im not directly working on.

I would like to use the following logic in my class to control this.  Could 
somebody help me with the proper syntax to get this working?


class myapp {

  Class['myapp::phase1'] only if [ ! -e /path/to/puppet.phase ]
    # myapp::phase1 will echo 'phase2' into /path/to/puppet.phase  once
all
requirements are met

  Class['myapp::phase2'] only if [ $(cat /path/to/puppet.phase) ==
'phase2'
]
    # myapp::phase2 will echo 'phase3' into /path/to/puppet.phase  once
all
requirements are met

  Class['myapp::phase3'] only if [ $(cat /path/to/puppet.phase) ==
'phase3'
]
}

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