Chef - Returning a variable from powershell script

Question

I would like to know if there is a way to return a variable value from a powershell script defined in powershell_script resource?

My powershell resource looks like following:

powershell_script "Test Script" do
  code <<-EOH
    Write-Host "Hello World!"
   return "test"
  EOH
end

I would like to use the returned value test from the script to use in other resources based on if conditions.

Thanks

I think this article answers your question. [1]: stackoverflow.com/questions/10286164/… — Jeremy
– Jeremy, Commented Dec 27, 2013 at 18:30
Thanks for your input here. My question is within Chef context and not in generic powershell terms. — user3140243
– user3140243, Commented Dec 27, 2013 at 18:34

sethvargo · Accepted Answer · 2013-12-28 01:27:49Z

5

Ohai!

I think you actually want to use the PowershellOut Mixin found here in the Powershell cookbook.

Chef resources rarely return values, but that's what heavy-weight resources are for!

If you have the powershell cookbook, you can do this:

include Chef::Mixin::PowershellOut
cmd = powershell_out!('command')
cmd.stdout #=> ...
cmd.stderr #=> ...

answered Dec 28, 2013 at 1:27

sethvargo

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5 Comments

user3140243 Over a year ago

Thanks! I ended up using that. Do you know if PowershellOut is included in windows cookbook by default in version 11.8.x?

user3140243 Over a year ago

Thanks! Your response is much appreciated.

sethvargo Over a year ago

This is actually a lesser-known feature of the PS cookbook and could really benefit from a blog post. Would you like to write one?

user3140243 Over a year ago

I have added a blog posting here kapilshardha.blogspot.com/2013/12/… Let me know if you have any suggestions on improving it.

Ci3 Over a year ago

@sethvargo Your referenced link is broken.

brendonmartino · Accepted Answer · 2014-12-15 18:45:32Z

We actually came across this exact issue and solved it by writing our own Mixlib to get the exit code from a powershell script. Example:

# get the result object (and exit code) from the code execution:           
result = Mixlibrary::Core::Shell.windows_script_out(:powershell, mycode)
exit_status = result.exitstatus

@carpNick is planning on open-sourcing this perhaps as soon as this week....at the moment it only handles powershell, but we plan on implementing support for other types as well (bash, win modules, etc.) -- which should be fairly easy to add on support for others.

We are currently using it in-house and it works great. I'm sure Chef will want to review Nick's excellent code once he gets it out there. We are just waiting on legal to tell us what open-source license to use.

Ask Nick for more details... @carpnick | https://github.com/carpnick

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