upstart environment variable expansion ambiguity.

[Sean Abbott]

I'm writing my first upstart job to run selenium2 as a service on VMs. 
This was my first hack:
http://paste.ubuntu.com/1003268/

It didn't work, and after adding the suggested environment variable
lines to debug my environment, I found out it's because the variables
aren't expanding as I expected.  In the pastebin version, they expand
like so: 

SELENIUM_EXEC='java -jar $SELENIUM_JAR'

So, I saw that in *some* of the examples, variable appear to be escaped
by single quotes (like here:  http://upstart.ubuntu.com/cookbook/#env),
so I tried, 

SELENIUM_EXEC="java -jar '$SELENIUM_JAR'"

and then my environment output was:

SELENIUM_EXEC='java -jar '"'"'$SELENIUM_JAR'"'"  #yes, this is a ton of
alternating single and double quotes

So, I have two questions.  Which usage of variables is correct if you
are going to expand them?  This one: 

http://upstart.ubuntu.com/cookbook/#env

or this one:
http://upstart.ubuntu.com/cookbook/#environment-variables  # (scroll to
the 'as another example' part.)

Second:  can someone give me a hint as to how to get variable expansion
to work as expected?

Thanks!

sean
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