Morning all

I'm currently working on a module[1] to support installation and 
configuration of Apache Karaf[2], a Java OSGi container... 

I've got most of the installation piece sorted, and am starting to work on 
the configuration side of things. 
Unfortunately I've hit a bit of a blocker which I'm not sure of the best 
way to work-around. 

As part of the service installation process, a Java wrapper config file is 
created. 
This config file needs to be modified to specify the 'JAVA_HOME' value. 
However I'm not sure of the best way to calculate this JAVA_HOME value, due 
to the variable nature of both Java variants (Java 6 vs 7, Oracle vs 
OpenJDK, release version) and the fact that Java might not be installed at 
the start of the Puppet run. 
The intention is to use a template for the config file, so it's modifiable 
by Puppet. 

Options I can think of: 

   1. Use a fact to provide JAVA_HOME. This fails if Java isn't installed 
   at the start of the agent run, which is a valid scenario if this module is 
   also installing Java... 
   2. Hard code the value based on a pre-determined file path based on 
   chosen Java distro and version. Not very clean/configurable...
   3. Update wrapper config file to pull in system env for JAVA_HOME. 
   However this fails if the system version isn't the one that the app should 
   use... 
   
Am I missing a trick somewhere along the lines, or is hoping to achieve all 
this - Install Java, Install Karaf, configure Karaf service - in one run 
asking too much? 

Thoughts/ideas welcome. 

Cheers
Gavin

[1] https://github.com/fatmcgav/fatmcgav-karaf/tree/develop
[2] http://karaf.apache.org/index.html

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