Lay groundwork for zuulv2/v3 coexisting

Both v2 and v3 deployments need to be supported for a bit after zuulv3
feature is merged. The architectures are different, with some parts
missing (jenkins), while new parts being added (zuul-exector). It is
logical to split the configuration into two using zuulv2 flag.

Setting zuulv2 to true would use the old configuration. The choice to
use zuulv2 = true instead of zuulv3 = false is made so that it would be
easier to remove the flag once v2 support is removed.

The support for v3 is not added with this patch. It merely allows for
feature/zuulv3 to be merged to master without forcing users of
puppet-openstackci to pickup the new version.

For zuulv2 using zuul@2.6.0 and nodepool@0.5.0 which represent the
latest master state as of this patch. The default used to be 'master'
for both in single_node_ci class, so this should minimize unintended
consequences for those who used the class with defaults.

Change-Id: I2e7cd8d1c8e662b7e21fa80d4fa62846e2d44a70
Story: #2001367
Task: #5951

contrib/single_node_ci_site.pp

@@ -51,6 +51,7 @@ node default {
     smtp_host                   => hiera('smtp_host', 'localhost'),
     smtp_default_from           => hiera('smtp_default_from', "zuul@${vhost_name}"),
     smtp_default_to             => hiera('smtp_default_to', "zuul.reports@${vhost_name}"),
+    zuulv2                      => hiera('zuulv2', true),
     zuul_revision               => hiera('zuul_revision', 'master'),
     zuul_git_source_repo        => hiera('zuul_git_source_repo',
       'https://git.openstack.org/openstack-infra/zuul'),

manifests/single_node_ci.pp

@@ -113,6 +113,9 @@
 #   The default 'to' e-mail address zuul will use when it sends
 #   notification e-mails.
 #
+# [*zuulv2*]
+#   Set to true to deploy zuul v2 (incompatible with zuul v3).
+#
 # [*zuul_revision*]
 #   The branch name used to install zuul.
 #
@@ -184,7 +187,8 @@ class openstackci::single_node_ci (
   $smtp_host                     = 'localhost',
   $smtp_default_from             = "zuul@${vhost_name}",
   $smtp_default_to               = "zuul.reports@${vhost_name}",
-  $zuul_revision                 = 'master',
+  $zuulv2                        = true,
+  $zuul_revision                 = undef,
   $zuul_git_source_repo          = 'https://git.openstack.org/openstack-infra/zuul',
 
   # Nodepool configurations
@@ -194,10 +198,24 @@ class openstackci::single_node_ci (
   $nodepool_jenkins_target       = undef,
   $jenkins_api_key               = undef,
   $jenkins_credentials_id        = undef,
-  $nodepool_revision             = 'master',
+  $nodepool_revision             = undef,
   $nodepool_git_source_repo      = 'https://git.openstack.org/openstack-infra/nodepool',
 ) {
 
+  if $zuulv2 {
+
+    if $nodepool_revision == undef {
+      $nodepool_revision_ = '0.5.0'
+    } else {
+      $nodepool_revision_ = $nodepool_revision
+    }
+
+    if $zuul_revision == undef {
+      $zuul_revision_ = '2.6.0'
+    } else {
+      $zuul_revision_ = $zuul_revision
+    }
+
   class { '::openstackci::jenkins_master':
     vhost_name              => $jenkins_vhost_name,
     serveradmin             => $serveradmin,
@@ -227,7 +245,7 @@ class openstackci::single_node_ci (
     git_email            => $git_email,
     git_name             => $git_name,
     manage_common_zuul   => false,
-    revision             => $zuul_revision,
+    revision             => $zuul_revision_,
     git_source_repo      => $zuul_git_source_repo,
   }
 
@@ -248,14 +266,14 @@ class openstackci::single_node_ci (
     smtp_host            => $smtp_host,
     smtp_default_from    => $smtp_default_from,
     smtp_default_to      => $smtp_default_to,
-    revision             => $zuul_revision,
+    revision             => $zuul_revision_,
   }
 
   class { '::openstackci::nodepool':
     mysql_root_password       => $mysql_root_password,
     mysql_password            => $mysql_nodepool_password,
     nodepool_ssh_private_key  => $jenkins_ssh_private_key,
-    revision                  => $nodepool_revision,
+    revision                  => $nodepool_revision_,
     git_source_repo           => $nodepool_git_source_repo,
     oscc_file_contents        => $oscc_file_contents,
     environment               => {
@@ -274,4 +292,24 @@ class openstackci::single_node_ci (
       },
     ],
   }
+
+  } else {
+  # Zuul V3
+
+    if $nodepool_revision == undef {
+      $nodepool_revision_ = 'master'
+    } else {
+      $nodepool_revision_ = $nodepool_revision
+    }
+
+    if $zuul_revision == undef {
+      $zuul_revision_ = 'master'
+    } else {
+      $zuul_revision_ = $zuul_revision
+    }
+
+    # TODO v3 all in one
+    fail('zuul v3 all in one deployment is not supported')
+  }
+
 }