postgresql::server::config_entry should allow the empty string for value parameter

[antaflos]

Describe the Bug

PostgreSQL supports and allows config entries, such as those in postgresql.conf, to be set to the empty string. The postgresql::server::config_entry defined type, however, requires String[1] when supplying string values. This doesn't allow for the empty string.

Expected Behavior

The postgresql::server::config_entry defined type should allow the empty string for its value parameter.

Steps to Reproduce

A typical use case is setting database-specific parameters that can be empty:

postgresql::server::config_entry { 'my_database.important_parameter':
  value => ''
}

This should render as follows in postgresql.conf, which is valid from PostgreSQL's PoV.

my_database.important_parameter = ''

However, the Puppet agent run fails with an error message:

Postgresql::Server::Config_entry[my_database.important_parameter]: parameter 'value' expects a value of type Undef, String[1], Numeric, or Array[String[1]], got String

This is because the empty string is not allowed here.

Environment

• Version 10.3.0
• Platform Ubuntu 20.04, 22.04