templates: Add ipv6 variant that triggers azure singlestack

Refactor cluster_variant checking to be more robust.

Author: smarterclayton

ci-operator/templates/openshift/installer/cluster-launch-installer-e2e.yaml

@@ -393,10 +393,18 @@ objects:
         cp "$(command -v openshift-install)" /tmp
         mkdir /tmp/artifacts/installer
 
+        function has_variant() {
+          regex="(^|,)$1($|,)"
+          if [[ $CLUSTER_VARIANT =~ $regex ]]; then
+            return 0
+          fi
+          return 1
+        }
+
         if [[ -n "${INSTALL_INITIAL_RELEASE}" && -n "${RELEASE_IMAGE_INITIAL}" ]]; then
           echo "Installing from initial release ${RELEASE_IMAGE_INITIAL}"
           OPENSHIFT_INSTALL_RELEASE_IMAGE_OVERRIDE="${RELEASE_IMAGE_INITIAL}"
-        elif [[ "${CLUSTER_VARIANT}" =~ "mirror" ]]; then
+        elif has_variant "mirror"; then
           export PATH=$PATH:/tmp  # gain access to oc
           while [ ! command -V oc ]; do sleep 1; done # poll to make sure that the test container has dropped oc into the shared volume
 
@@ -424,18 +432,18 @@ objects:
         cp "${SSH_PRIV_KEY_PATH}" ~/.ssh/
 
         workers=3
-        if [[ "${CLUSTER_VARIANT}" =~ "compact" ]]; then
+        if has_variant "compact"; then
           workers=0
         fi
         if [[ "${CLUSTER_TYPE}" = "aws" ]]; then
             master_type=null
-            if [[ "${CLUSTER_VARIANT}" =~ "xlarge" ]]; then
+            if has_variant "xlarge"; then
               master_type=m5.8xlarge
-            elif [[ "${CLUSTER_VARIANT}" =~ "large" ]]; then
+            elif has_variant "large"; then
               master_type=m5.4xlarge
             fi
             subnets="[]"
-            if [[ "${CLUSTER_VARIANT}" =~ "shared-vpc" ]]; then
+            if has_variant "shared-vpc"; then
               case $((RANDOM % 4)) in
               0) subnets="['subnet-030a88e6e97101ab2','subnet-0e07763243186cac5','subnet-02c5fea7482f804fb','subnet-0291499fd1718ee01','subnet-01c4667ad446c8337','subnet-025e9043c44114baa']";;
               1) subnets="['subnet-0170ee5ccdd7e7823','subnet-0d50cac95bebb5a6e','subnet-0094864467fc2e737','subnet-0daa3919d85296eb6','subnet-0ab1e11d3ed63cc97','subnet-07681ad7ce2b6c281']";;
@@ -498,7 +506,7 @@ objects:
             vnetname=""
             ctrlsubnet=""
             computesubnet=""
-            if [[ "${CLUSTER_VARIANT}" =~ "shared-vpc" ]]; then
+            if has_variant "shared-vpc"; then
               vnetrg="os4-common"
               vnetname="do-not-delete-shared-vnet-${AZURE_REGION}"
               ctrlsubnet="subnet-1"
@@ -545,7 +553,7 @@ objects:
             network=""
             ctrlsubnet=""
             computesubnet=""
-            if [[ "${CLUSTER_VARIANT}" =~ "shared-vpc" ]]; then
+            if has_variant "shared-vpc"; then
               network="do-not-delete-shared-network"
               ctrlsubnet="do-not-delete-shared-master-subnet"
               computesubnet="do-not-delete-shared-worker-subnet"
@@ -580,7 +588,7 @@ objects:
 
         # as a current stop gap -- this is pointing to a proxy hosted in
         # the namespace "ci-test-ewolinet" on the ci cluster
-        if [[ "${CLUSTER_VARIANT}" =~ "proxy" ]]; then
+        if has_variant "proxy"; then
 
         # FIXME: due to https://bugzilla.redhat.com/show_bug.cgi?id=1750650 we need to
         # use a http endpoint for the httpsProxy value
@@ -664,17 +672,31 @@ objects:
         fi
 
         network_type="${CLUSTER_NETWORK_TYPE-}"
-        if [[ "${CLUSTER_VARIANT}" =~ "ovn" ]]; then
+        if has_variant "ovn"; then
           network_type=OVNKubernetes
         fi
-        if [[ -n "${network_type}" ]]; then
+        if has_variant "ipv6"; then
+          export OPENSHIFT_INSTALL_AZURE_EMULATE_SINGLESTACK_IPV6=true
+          cat >> /tmp/artifacts/installer/install-config.yaml << EOF
+        networking:
+          networkType: OVNKubernetes
+          machineNetwork:
+            - cidr: 10.0.0.0/16
+            - cidr: fd00::/48
+            clusterNetwork:
+            - cidr: fd01::/48
+              hostPrefix: 64
+            serviceNetwork:
+            - fd02::/112
+          EOF
+        elif [[ -n "${network_type}" ]]; then
           cat >> /tmp/artifacts/installer/install-config.yaml << EOF
         networking:
           networkType: ${network_type}
         EOF
         fi
 
-        if [[ "${CLUSTER_VARIANT}" =~ "mirror" ]]; then
+        if has_variant "mirror"; then
           cat >> /tmp/artifacts/installer/install-config.yaml << EOF
         imageContentSources:
         - source: "${MIRROR_BASE}-scratch"
@@ -683,7 +705,7 @@ objects:
         EOF
         fi
 
-        if [[ "${CLUSTER_VARIANT}" =~ "fips" ]]; then
+        if has_variant "fips"; then
           cat >> /tmp/artifacts/installer/install-config.yaml << EOF
         fips: true
         EOF