Store variable value from shell provisioner and handle exit code

[Vamshi krishna]

1. Is it possible to store the output of an inline shell command in a packer variable?  I have looked into docs and have not found a proper example of doing it. 
   
2. Is it possible to run shell provisioner even if other provisioners fails to execute or throw an exit code 1 ?

one of my provisioner runs chef-client and if it succeeds I won't have any problems but if it fails the packer exit's with code 1. my subsequent provisioners are `deleting the node and client` from the chef server. I want these commands to be executed even if the first provisioner fails.

[Rickard von Essen]

1. No

2. No. To do something like that you have to wrap your script in another script that will execute appropriate cleanup tasks*). This only works in a shell provisioner. If you rely on another provisioner you might manipulate the execute_command to write down the exit code to a file and ignore expected exit codes. And then run a script that do appropriate cleanup and reuse the exit code from the previous provisioner.

*) http://www.tldp.org/LDP/abs/html/abs-guide.html#TRAPREF1

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