Short hack: As seen in m a n y Dockerfiles, the apt cache is located at /var/lib/apt/lists.
Therefore, we can use it's existence to create an idempotent exec-Ressouce!
exec { 'apt update':
# Only if the update files dont exist
unless => '[ "$(ls -A /var/lib/apt/lists)" ]',
# /bin is needed for bash
# /usr/bin is needed for [
path => '/bin:/usr/bin',
}
Now whenever you need to have the apt cache first, just do something like
package { 'your-package':
ensure => 'present',
require => Exec['apt update']
}
Easy as 🥧
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