Resolve conflicting package resource declarations - puppet

Question

We are attempting to use the camptocamp/puppet-nagios module, but we're running into a packaging naming conflict between vanilla CentOS repositories and RPMForge/RepoForge. The nsca daemon in CentOS provides the same service as the nagios-nsca package in RepoForge. In attempt to install the RepoForge package yet satisify the Package requirement for nsca resource, I've added this to my node definition:
include ::nagios
package { 'nagios-nsca': ensure => installed, alias => 'nsca', }
include ::nagios::nsca::server
The resulting error is:
Error: Duplicate declaration: Package[nsca] is already declared in
file /tmp/vagrant-puppet-1/modules-0/role/manifests/nagios.pp:45;
cannot redeclare at
/tmp/vagrant-puppet-1/modules-2/nagios/manifests/nsca/server.pp:24
The next test was to use order and calling the class directly from the node:
include ::nagios
package { 'nagios-nsca': ensure => installed, alias => 'nsca', } ->
class {'::nagios::nsca::server' : }
The code in question inside the nagios/manifests/nsca/server.pp file is:
class nagios::nsca::server(
$decryption_method = pick($nagios_nsca_decryption_method, '0'),
) {
include ::nagios::params
# variables used in ERB template
$basename = $nagios::params::basename
if !defined (Package['nsca']) {
package {'nsca':
ensure => installed;
}
}
Any insight as to what's happening here? I can always fork the camptocamp/puppet-nagios code and force the behavior we want, but I'd rather not.

Answer 1

Due to ! defined(Package['title']) not working as expected. I fixed this by giving nagios::nsca::server an additional parameter of nsca_package, including a default value of nsca to preserve current behavior:
--- a/manifests/nsca/server.pp
+++ b/manifests/nsca/server.pp
## -11,6 +11,7 ##
#
class nagios::nsca::server(
$decryption_method = pick($nagios_nsca_decryption_method, '0'),
+ $nsca_package = 'nsca'
) {
include ::nagios::params
## -20,6 +21,7 ## class nagios::nsca::server(
if !defined (Package['nsca']) {
package {'nsca':
+ name => $nsca_package,
ensure => installed;
}
}
Use for this new parameter would be:
node 'my-nagios-server.local' {
include ::nagios
class {'::nagios::nsca::server': nsca_package => 'nagios-nsca', }
}