Debugging puppet error : Could not find dependency

[Milind Vaidya]

Background

Puppet Newbie, trying to maintain some old puppet version on a box. The aim is to unload an old program using it's old plist file and start new one. 

Problem

I have following code in .pp file

    $old_launch_agent_path = "${home}/Library/LaunchAgents/com.company.program.plist"

    exec {

      'stop-old-program':

      command => "/bin/launchctl unload ${old_launch_agent_path}",

      refreshonly => true,

      subscribe => [ File[$old_launch_agent_path] ];

    }

    Error: Could not find dependency File[/Users/executer/Library/LaunchAgents/com.company.program.plist] for Exec[stop-old-program] at /private/tmp/mobile-puppet-manifests/puppet-manifests-test/modules/program/manifests/init.pp:51

The changes are on a git branch and are being applied `sudo puppet-apply -d -f -b mac-upgrade`

    ls -l /Users/executer/Library/LaunchAgents/com.company.program.plist`

    -rw-r--r--  1 executer  staff  999 May 19 14:36 /Users/executer/Library/LaunchAgents/com.company.program.plist

Stack overflow link :

https://stackoverflow.com/questions/61938607/debugging-puppet-error-could-not-find-dependency

[Ben Ford]

Hi Milind,

The critical difference here is that subscribe => File[$old_launch_agent_path] does NOT tell Puppet to watch for changes in that file on disk.

Instead it will run that exec if Puppet itself is managing that resource and makes changes to that resource. In other words, File[$old_launch_agent_path] has to be in the catalog, and it only fires when it's out of sync and Puppet makes changes to it. Something like the following:

$old_launch_agent_path = "${home}/Library/LaunchAgents/com.company.program.plist"

file { $old_launch_agent_path:  <----------------------------------┐
    ensure => file,                                                |
    #...                                                           |

}                                                                  |
                                                                   |
 exec { 'stop-old-program':                                        |
    command => "/bin/launchctl unload ${old_launch_agent_path}",   |
    refreshonly => true,                                           |

    subscribe => File[$old_launch_agent_path], #   ----------------┘
}

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