Jira (PUP-10660) $module_name is not available up in epp()

Magnus Jonsson (Jira)

unread,

Sep 7, 2020, 5:12:03 AM9/7/20

to puppe...@googlegroups.com

Magnus Jonsson created an issue

Puppet /

PUP-10660

$module_name is not available up in epp()

Issue Type:	Bug
Affects Versions:	PUP 6.17.0
Assignee:	Unassigned
Created:	2020/09/07 2:11 AM
Priority:	Normal
Reporter:	Magnus Jonsson

Puppet Version: 6.17.0
Puppet Server Version: N/A
OS Name/Version: Ubuntu 16.04

Accessing the global (compiler) variabel $module_name in epp() does return an empty string. It does not generate an error/warning that is does not exist.

It is working in inline_epp().

The documentations indicates that this should work. See last paragraph of https://puppet.com/docs/puppet/6.18/lang_template_epp.html#epp_variables

Example module to repoduce:

the file: 'epp-modulename-file.txt' has the same content as $inl

class eppmnbug

Unknown macro: { $mn = $module_name $inl = @(INL) modulename}

Desired Behavior:

modulename: eppmnbug
noop: true
mn: eppmnbug

Actual Behavior:

modulename:
noop: true
mn: eppmnbug

Add Comment

This message was sent by Atlassian Jira (v8.5.2#805002-sha1:a66f935)

Henrik Lindberg (Jira)

unread,

Sep 7, 2020, 3:17:03 PM9/7/20

to puppe...@googlegroups.com

Henrik Lindberg commented on

PUP-10660

Re: $module_name is not available up in epp()

It is actually that way by design. The epp()} function does not have access to the calling scope as it is evaluated in the top scope, and all variables must be given to it. In contrast {{inline_epp has access to the variables in the calling scope.

The $modulename is a special variable that is not really a top scope var - it cannot be since it since it has a different value depending on scope.

Add Comment

Magnus Jonsson (Jira)

unread,

Sep 10, 2020, 8:48:03 AM9/10/20

to puppe...@googlegroups.com

Magnus Jonsson commented on

PUP-10660

Re: $module_name is not available up in epp()

If it's not in the scope then I think that the epp() should complain that is not available at all and not just return an empty string.

Add Comment

Henrik Lindberg (Jira)

unread,

Sep 11, 2020, 9:54:04 AM9/11/20

to puppe...@googlegroups.com

Henrik Lindberg commented on

PUP-10660

Re: $module_name is not available up in epp()

That is also by design (ancient design decision that all variables that does not exist resolve to undef which renders as empty string). You can turn on "strict variables" as that would make it error instead. It is not on by default due to backwards compatibility reasons and if you turn it on you may find that the code you are running needs to be modified.