Puppet Fails to Resolve Hostname Using ${hostname}\ and any other Variable in Source Path

[banafshehft]

Describe the Bug

I am encountering an issue with Puppet where the ${hostname} variable is not resolving correctly in the source path of a file resource. The following manifest snippet is intended to retrieve a certificate file based on the system hostname:

file { '/etc/ssl/certs/Certname':
  source => "puppet:///modules/arch/vault-certs/${hostname}.Certname",
  mode   => '0644',
}

However, this results in a 404 Not Found error, as Puppet is not expanding the ${hostname} variable correctly, leading to it searching for an incorrect file name.

Expected Behavior

expected Puppet to resolve the ${hostname} variable correctly and construct the appropriate source path to retrieve the certificate file.

I have to mention it is a bug in the puppet version : puppet 8.9.0-4

Environment

• puppet 8.9.0-4
• Platform : linux 6.11.3.arch1-1

Additional Context

Could you please provide a temporary solution to the issue at hand, at least until we can implement a permanent fix? Thank you

[banafshehft]

i should mention it seems fact works fine : facter hostname gives me the correct value
i also tried to use fact in my puppet code like this : $::hostname didnt help

[banafshehft]

i also tried this as puppet says :
source => "puppet:///modules/arch/vault-certs/$facts['networking']['hostname'].Cername
still fails with tons of errors

[joshcooper]

Hi @banafshehft Puppet 8 agents no longer send legacy facts, like hostname, to the server, see https://www.puppet.com/blog/puppet-8 for more details. You'll need to modify your manifest to reference the structured fact. Recommend running puppet-lint to validate your code. Rather than discussing this in the issue tracker, I recommend reaching out in the puppetcommunity slack. Lots of folks there can get you pointed in the right direction.