Add IBM Power VS: tfvars

For more background on IPI on Power VS, refer to the enhancement
proposal here: openshift/enhancements#736

Older discussions on some of the code here can be found in openshift#5224

Signed-off-by: Christy Norman <christy@linux.vnet.ibm.com>

pkg/asset/cluster/tfvars.go

@@ -13,6 +13,7 @@ import (
 	ibmcloudprovider "github.com/openshift/cluster-api-provider-ibmcloud/pkg/apis/ibmcloudprovider/v1beta1"
 	libvirtprovider "github.com/openshift/cluster-api-provider-libvirt/pkg/apis/libvirtproviderconfig/v1beta1"
 	ovirtprovider "github.com/openshift/cluster-api-provider-ovirt/pkg/apis/ovirtprovider/v1beta1"
+	powervsprovider "github.com/openshift/machine-api-provider-powervs/pkg/apis/powervsprovider/v1alpha1"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	awsprovider "sigs.k8s.io/cluster-api-provider-aws/pkg/apis/awsprovider/v1beta1"
@@ -44,6 +45,7 @@ import (
 	libvirttfvars "github.com/openshift/installer/pkg/tfvars/libvirt"
 	openstacktfvars "github.com/openshift/installer/pkg/tfvars/openstack"
 	ovirttfvars "github.com/openshift/installer/pkg/tfvars/ovirt"
+	powervstfvars "github.com/openshift/installer/pkg/tfvars/powervs"
 	vspheretfvars "github.com/openshift/installer/pkg/tfvars/vsphere"
 	"github.com/openshift/installer/pkg/types"
 	"github.com/openshift/installer/pkg/types/alibabacloud"
@@ -56,6 +58,7 @@ import (
 	"github.com/openshift/installer/pkg/types/none"
 	"github.com/openshift/installer/pkg/types/openstack"
 	"github.com/openshift/installer/pkg/types/ovirt"
+	"github.com/openshift/installer/pkg/types/powervs"
 	"github.com/openshift/installer/pkg/types/vsphere"
 )
 
@@ -672,6 +675,46 @@ func (t *TerraformVariables) Generate(parents asset.Parents) error {
 			Filename: TfPlatformVarsFileName,
 			Data:     data,
 		})
+	case powervs.Name:
+		masters, err := mastersAsset.Machines()
+		if err != nil {
+			return err
+		}
+
+		// Get CISInstanceCRN from InstallConfig metadata
+		crn, err := installConfig.PowerVS.CISInstanceCRN(ctx)
+		if err != nil {
+			return err
+		}
+
+		masterConfigs := make([]*powervsprovider.PowerVSMachineProviderConfig, len(masters))
+		for i, m := range masters {
+			masterConfigs[i] = m.Spec.ProviderSpec.Value.Object.(*powervsprovider.PowerVSMachineProviderConfig)
+		}
+
+		data, err = powervstfvars.TFVars(
+			powervstfvars.TFVarsSources{
+				MasterConfigs:        masterConfigs,
+				Region:               installConfig.Config.Platform.PowerVS.Region,
+				Zone:                 installConfig.Config.Platform.PowerVS.Zone,
+				APIKey:               os.Getenv("IC_API_KEY"),
+				SSHKey:               installConfig.Config.SSHKey,
+				PowerVSResourceGroup: installConfig.Config.PowerVS.PowerVSResourceGroup,
+				ImageBucketFileName:  string(*rhcosImage),
+				NetworkName:          installConfig.Config.PowerVS.PVSNetworkName,
+				CISInstanceCRN:       crn,
+				VPCSubnetName:        installConfig.Config.PowerVS.Subnets[0],
+				VPCName:              installConfig.Config.PowerVS.VPC,
+			},
+		)
+		if err != nil {
+			return errors.Wrapf(err, "failed to get %s Terraform variables", platform)
+		}
+		t.FileList = append(t.FileList, &asset.File{
+			Filename: TfPlatformVarsFileName,
+			Data:     data,
+		})
+
 	case vsphere.Name:
 		controlPlanes, err := mastersAsset.Machines()
 		if err != nil {

pkg/tfvars/powervs/powervs.go

@@ -0,0 +1,89 @@
+// Package powervs contains Power Virtual Servers-specific Terraform-variable logic.
+package powervs
+
+import (
+	"encoding/json"
+	"fmt"
+	"math/rand"
+	"time"
+
+	"github.com/openshift/installer/pkg/types/powervs"
+	"github.com/openshift/machine-api-provider-powervs/pkg/apis/powervsprovider/v1alpha1"
+)
+
+type config struct {
+	ServiceInstanceID    string `json:"powervs_cloud_instance_id"`
+	APIKey               string `json:"powervs_api_key"`
+	SSHKey               string `json:"powervs_ssh_key"`
+	PowerVSRegion        string `json:"powervs_region"`
+	PowerVSZone          string `json:"powervs_zone"`
+	VPCRegion            string `json:"powervs_vpc_region"`
+	VPCZone              string `json:"powervs_vpc_zone"`
+	PowerVSResourceGroup string `json:"powervs_resource_group"`
+	CISInstanceCRN       string `json:"powervs_cis_crn"`
+	ImageBucketFileName  string `json:"powervs_image_bucket_file_name"`
+	NetworkName          string `json:"powervs_network_name"`
+	VPCName              string `json:"powervs_vpc_name"`
+	VPCSubnetName        string `json:"powervs_vpc_subnet_name"`
+	BootstrapMemory      string `json:"powervs_bootstrap_memory"`
+	BootstrapProcessors  string `json:"powervs_bootstrap_processors"`
+	MasterMemory         string `json:"powervs_master_memory"`
+	MasterProcessors     string `json:"powervs_master_processors"`
+	ProcType             string `json:"powervs_proc_type"`
+	SysType              string `json:"powervs_sys_type"`
+}
+
+// TFVarsSources contains the parameters to be converted into Terraform variables
+type TFVarsSources struct {
+	MasterConfigs        []*v1alpha1.PowerVSMachineProviderConfig
+	APIKey               string
+	SSHKey               string
+	Region               string
+	Zone                 string
+	ImageBucketFileName  string
+	NetworkName          string
+	PowerVSResourceGroup string
+	VPCZone              string
+	CISInstanceCRN       string
+	VPCName              string
+	VPCSubnetName        string
+}
+
+// TFVars generates Power VS-specific Terraform variables launching the cluster.
+func TFVars(sources TFVarsSources) ([]byte, error) {
+	masterConfig := sources.MasterConfigs[0]
+	vpcRegion := powervs.Regions[sources.Region].VPCRegion
+
+	vpcZone := sources.VPCZone
+	if vpcZone == "" {
+		// Randomly select a zone in the VPC region.
+		// @TODO: Align this with a region later.
+		rand.Seed(time.Now().UnixNano())
+		// All supported Regions are MZRs and have Zones named "region-[1-3]"
+		vpcZone = fmt.Sprintf("%s-%d", vpcRegion, rand.Intn(2)+1)
+	}
+
+	cfg := &config{
+		ServiceInstanceID:    masterConfig.ServiceInstanceID,
+		APIKey:               sources.APIKey,
+		SSHKey:               sources.SSHKey,
+		PowerVSRegion:        sources.Region,
+		PowerVSZone:          sources.Zone,
+		VPCRegion:            vpcRegion,
+		VPCZone:              vpcZone,
+		PowerVSResourceGroup: sources.PowerVSResourceGroup,
+		CISInstanceCRN:       sources.CISInstanceCRN,
+		ImageBucketFileName:  sources.ImageBucketFileName,
+		NetworkName:          *masterConfig.Network.Name,
+		VPCName:              sources.VPCName,
+		VPCSubnetName:        sources.VPCSubnetName,
+		BootstrapMemory:      masterConfig.Memory,
+		BootstrapProcessors:  masterConfig.Processors,
+		MasterMemory:         masterConfig.Memory,
+		MasterProcessors:     masterConfig.Processors,
+		ProcType:             masterConfig.ProcType,
+		SysType:              masterConfig.SysType,
+	}
+
+	return json.MarshalIndent(cfg, "", "  ")
+}