fix ubuntu 18.04 invalid repo

Postgresql no longer specifically supports Ubuntu 18.04, but still
supports Debian 10 which can be used until Puppet drops support for Ubuntu
18.04.

data/os/Ubuntu/18.04.yaml

@@ -0,0 +1,3 @@
+---
+postgresql::repo::baseurl: https://apt-archive.postgresql.org/pub/repos/apt/
+postgresql::repo::release: "%{facts.os.distro.codename}-pgdg-archive"

manifests/globals.pp

@@ -60,6 +60,7 @@
 #
 # @param repo_baseurl Sets the baseurl for the PostgreSQL repository. Useful if you host your own mirror of the repository.
 # @param yum_repo_commonurl Sets the url for the PostgreSQL common Yum repository. Useful if you host your own mirror of the YUM repository.
+# @param apt_source_release Overrides the default release for the apt source.
 #
 # @param needs_initdb
 #   Explicitly calls the initdb operation after the server package is installed and before the PostgreSQL service is started.
@@ -150,6 +151,7 @@
   Optional[String[1]] $repo_proxy                  = undef,
   Optional[String[1]] $repo_baseurl                = undef,
   Optional[String[1]] $yum_repo_commonurl          = undef,
+  Optional[String[1]] $apt_source_release          = undef,
 
   Optional[Boolean] $needs_initdb                  = undef,
 
@@ -271,6 +273,7 @@
       proxy     => $repo_proxy,
       baseurl   => $repo_baseurl,
       commonurl => $yum_repo_commonurl,
+      release   => $apt_source_release,
     }
   }
 

manifests/repo.pp

@@ -1,5 +1,6 @@
 # @api private
 class postgresql::repo (
+  Optional[String[1]] $release = undef,
   Optional[String[1]] $version = undef,
   Optional[String[1]] $proxy = undef,
   Optional[String[1]] $baseurl = undef,

manifests/repo/apt_postgresql_org.pp

@@ -7,16 +7,18 @@
   # http://www.postgresql.org/download/linux/debian/
   #
   $default_baseurl = 'https://apt.postgresql.org/pub/repos/apt/'
-
   $_baseurl = pick($postgresql::repo::baseurl, $default_baseurl)
 
+  $default_release = "${facts['os']['distro']['codename']}-pgdg"
+  $_release = pick($postgresql::repo::release, $default_release)
+
   apt::pin { 'apt_postgresql_org':
     originator => 'apt.postgresql.org',
     priority   => 500,
   }
   -> apt::source { 'apt.postgresql.org':
     location     => $_baseurl,
-    release      => "${facts['os']['distro']['codename']}-pgdg",
+    release      => $_release,
     repos        => 'main',
     architecture => $facts['os']['architecture'],
     key          => {

spec/classes/repo_spec.rb

@@ -9,5 +9,28 @@
     it 'instantiates apt_postgresql_org class' do
       expect(subject).to contain_class('postgresql::repo::apt_postgresql_org')
     end
+
+    it {
+      is_expected.to contain_apt__source('apt.postgresql.org')
+        .with_location('https://apt.postgresql.org/pub/repos/apt/')
+        .with_release("#{facts[:os]['distro']['codename']}-pgdg")
+    }
+
+    it { is_expected.to contain_apt__pin('apt_postgresql_org') }
+  end
+
+  describe 'with custom baseurl and release' do
+    let(:params) do
+      {
+        baseurl: 'https://apt-archive.postgresql.org/pub/repos/apt/',
+        release: 'bionic-pgdg-archive',
+      }
+    end
+
+    it {
+      is_expected.to contain_apt__source('apt.postgresql.org')
+        .with_location(params[:baseurl])
+        .with_release(params[:release])
+    }
   end
 end