how to run puppet based on command output

asked 2015-10-28 11:12:22 -0500

johntest
29 ●6 ●11 ●16

Hello

I am looking for a way to do the following

Based on the output of a command, need to decide if I want to run the manifest.

I do not want to run the manifest when "cat /var/tmp/check.txt" contains NULL (among other things). I do want to run the manifest when "cat /var/tmp/check.txt" does not contain NULL (among other things).

Seems like its a matter of simply using grep but how to do it with Puppet?

Thanks!

edit retag flag offensive close merge delete

Comments

Do you intend to run the manifest or just the resource? e.g. exec If you only need to run the run the `exec` resource for example, you can use the conditional `unless or only_if` parameter of that resource.

lupin ( 2015-10-28 12:08:12 -0500 )edit

@lupin The whole manifest (multiple resources) is dependent upon whether this condition meets or not. Thanks

johntest ( 2015-10-28 12:37:01 -0500 )edit

add a comment

2 Answers

Sort by » oldest newest most voted

answered 2015-10-30 14:01:44 -0500

JohnsonEarls
832 ●12 ●18 ●32

You can try doing this by creating a new stage that runs before the main stage, and have that stage do the test.

Note, your mileage may vary - I have not tried this outside of a very quick test.

The following example code, placed in your site.pp file, should only run the rest of the manifest if the file /var/tmp/check.txt is not empty.

stage { 'should_I_run':
    before => Stage['main']
}

class should_I_run {
    exec { "should_I_run":
        command => '/bin/test -s /var/tmp/check.txt' ,
    }
}

class { 'should_I_run':
    stage => 'should_I_run' ,
}