AGENT-853: Add ClusterInfo asset

cmd/node-joiner/main.go

@@ -19,7 +19,11 @@ func main() {
 		Use:   "add-nodes",
 		Short: "Generates an ISO that could be used to boot the configured nodes to let them join an existing cluster",
 		RunE: func(cmd *cobra.Command, args []string) error {
-			return nodejoiner.NewAddNodesCommand(wd)
+			kubeConfig, err := cmd.Flags().GetString("kubeconfig")
+			if err != nil {
+				return err
+			}
+			return nodejoiner.NewAddNodesCommand(wd, kubeConfig)
 		},
 	}
 
@@ -34,6 +38,7 @@ func main() {
 	rootCmd := &cobra.Command{
 		Use: "node-joiner",
 	}
+	rootCmd.PersistentFlags().String("kubeconfig", "", "Path to the kubeconfig file.")
 
 	rootCmd.AddCommand(nodesAddCmd)
 	rootCmd.AddCommand(nodesMonitorCmd)

pkg/asset/agent/joiner/addnodesconfig.go

@@ -0,0 +1,80 @@
+package joiner
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/openshift/installer/pkg/asset"
+)
+
+const (
+	addNodesParamsFile = ".addnodesparams"
+)
+
+// AddNodesConfig is used to store the current configuration
+// for the command.
+type AddNodesConfig struct {
+	File   *asset.File
+	Params Params
+}
+
+// Params is used to store the command line parameters.
+type Params struct {
+	Kubeconfig string `json:"kubeconfig,omitempty"`
+}
+
+// Save stores the current parameters on disk.
+func (p *Params) Save(assetsDir string) error {
+	data, err := json.Marshal(p)
+	if err != nil {
+		return err
+	}
+
+	fileName := filepath.Join(assetsDir, addNodesParamsFile)
+	return os.WriteFile(fileName, data, 0o600)
+}
+
+// Name returns the human-friendly name of the asset.
+func (*AddNodesConfig) Name() string {
+	return "AddNodes Config"
+}
+
+// Dependencies returns all of the dependencies directly needed to generate
+// the asset.
+func (*AddNodesConfig) Dependencies() []asset.Asset {
+	return []asset.Asset{}
+}
+
+// Generate it's empty for this asset, always loaded from disk.
+func (*AddNodesConfig) Generate(dependencies asset.Parents) error {
+	return nil
+}
+
+// Files returns the files generated by the asset.
+func (a *AddNodesConfig) Files() []*asset.File {
+	if a.File != nil {
+		return []*asset.File{a.File}
+	}
+	return []*asset.File{}
+}
+
+// Load returns agent config asset from the disk.
+func (a *AddNodesConfig) Load(f asset.FileFetcher) (bool, error) {
+	file, err := f.FetchByName(addNodesParamsFile)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return false, nil
+		}
+		return false, fmt.Errorf("failed to load %s file: %w", addNodesParamsFile, err)
+	}
+
+	params := &Params{}
+	if err := json.Unmarshal(file.Data, params); err != nil {
+		return false, fmt.Errorf("failed to unmarshal %s: %w", addNodesParamsFile, err)
+	}
+
+	a.Params = *params
+	return true, nil
+}

pkg/asset/agent/joiner/clusterinfo.go

@@ -0,0 +1,135 @@
+package joiner
+
+import (
+	"context"
+	"net/url"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+
+	configclient "github.com/openshift/client-go/config/clientset/versioned"
+	"github.com/openshift/installer/pkg/asset"
+	"github.com/openshift/installer/pkg/asset/agent/workflow"
+)
+
+// ClusterInfo it's an asset used to retrieve config info
+// from an already existing cluster.
+type ClusterInfo struct {
+	ClusterID  string
+	APIDNSName string
+	PullSecret string
+}
+
+var _ asset.WritableAsset = (*ClusterInfo)(nil)
+
+// Name returns the human-friendly name of the asset.
+func (ci *ClusterInfo) Name() string {
+	return "Agent Installer ClusterInfo"
+}
+
+// Dependencies returns all of the dependencies directly needed to generate
+// the asset.
+func (*ClusterInfo) Dependencies() []asset.Asset {
+	return []asset.Asset{
+		&workflow.AgentWorkflow{},
+		&AddNodesConfig{},
+	}
+}
+
+// Generate generates the ClusterInfo.
+func (ci *ClusterInfo) Generate(dependencies asset.Parents) error {
+	agentWorkflow := &workflow.AgentWorkflow{}
+	addNodesConfig := &AddNodesConfig{}
+	dependencies.Get(agentWorkflow, addNodesConfig)
+
+	if agentWorkflow.Workflow != workflow.AgentWorkflowTypeAddNodes {
+		return nil
+	}
+
+	config, err := ci.getRestConfig(addNodesConfig.Params.Kubeconfig)
+	if err != nil {
+		return err
+	}
+
+	err = ci.retrieveClusterID(config)
+	if err != nil {
+		return err
+	}
+
+	err = ci.retrieveAPIDNSName(config)
+	if err != nil {
+		return err
+	}
+
+	err = ci.retrievePullSecret(config)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (ci *ClusterInfo) getRestConfig(kubeconfig string) (*rest.Config, error) {
+	var err error
+	var config *rest.Config
+
+	if kubeconfig != "" {
+		config, err = clientcmd.BuildConfigFromFlags("", kubeconfig)
+	} else {
+		config, err = rest.InClusterConfig()
+	}
+
+	return config, err
+}
+
+func (ci *ClusterInfo) retrieveClusterID(config *rest.Config) error {
+	clientset, err := configclient.NewForConfig(config)
+	if err != nil {
+		return err
+	}
+
+	cv, err := clientset.ConfigV1().ClusterVersions().Get(context.Background(), "version", metav1.GetOptions{})
+	if err != nil {
+		return err
+	}
+	ci.ClusterID = string(cv.Spec.ClusterID)
+
+	return nil
+}
+
+func (ci *ClusterInfo) retrieveAPIDNSName(config *rest.Config) error {
+	parsedURL, err := url.Parse(config.Host)
+	if err != nil {
+		return err
+	}
+
+	ci.APIDNSName = parsedURL.Hostname()
+	return nil
+}
+
+func (ci *ClusterInfo) retrievePullSecret(config *rest.Config) error {
+	clientset, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		return err
+	}
+
+	pullSecret, err := clientset.CoreV1().Secrets("openshift-config").Get(context.Background(), "pull-secret", metav1.GetOptions{})
+	if err != nil {
+		return err
+	}
+	ci.PullSecret = string(pullSecret.Data[".dockerconfigjson"])
+
+	return nil
+}
+
+// Files returns the files generated by the asset.
+func (*ClusterInfo) Files() []*asset.File {
+	return []*asset.File{}
+}
+
+// Load returns agent config asset from the disk.
+func (*ClusterInfo) Load(f asset.FileFetcher) (bool, error) {
+	return false, nil
+}

pkg/asset/agent/workflow/agentworkflow.go

@@ -0,0 +1,65 @@
+package workflow
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/openshift/installer/pkg/asset"
+)
+
+// AgentWorkflow allows other assets to check
+// which is the workflow currently active.
+type AgentWorkflow struct {
+	File     *asset.File
+	Workflow AgentWorkflowType
+}
+
+var _ asset.WritableAsset = (*AgentWorkflow)(nil)
+
+// Name returns a human friendly name for the asset.
+func (*AgentWorkflow) Name() string {
+	return "Agent Workflow"
+}
+
+// Dependencies returns all of the dependencies directly needed to generate
+// the asset.
+func (*AgentWorkflow) Dependencies() []asset.Asset {
+	return []asset.Asset{}
+}
+
+// Generate generates the AgentWorkflow asset.
+func (a *AgentWorkflow) Generate(dependencies asset.Parents) error {
+	// Set install workflow as a default
+	a.Workflow = AgentWorkflowTypeInstall
+	a.File = &asset.File{
+		Filename: agentWorkflowFilename,
+		Data:     []byte(a.Workflow),
+	}
+
+	return nil
+}
+
+// Files returns the files generated by the asset.
+func (a *AgentWorkflow) Files() []*asset.File {
+	if a.File != nil {
+		return []*asset.File{a.File}
+	}
+	return []*asset.File{}
+}
+
+// Load returns the asset from disk.
+func (a *AgentWorkflow) Load(f asset.FileFetcher) (bool, error) {
+	file, err := f.FetchByName(agentWorkflowFilename)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return false, nil
+		}
+		return false, fmt.Errorf("failed to load %s file: %w", agentWorkflowFilename, err)
+	}
+
+	// Get the current workflow
+	a.Workflow = AgentWorkflowType(file.Data)
+	a.File = file
+
+	return true, nil
+}

pkg/asset/agent/workflow/agentworkflowaddnodes.go

@@ -0,0 +1,27 @@
+package workflow
+
+import "github.com/openshift/installer/pkg/asset"
+
+// AgentWorkflowAddNodes is meant just to define
+// the add nodes workflow.
+type AgentWorkflowAddNodes struct {
+	AgentWorkflow
+}
+
+var _ asset.WritableAsset = (*AgentWorkflowAddNodes)(nil)
+
+// Name returns a human friendly name for the asset.
+func (*AgentWorkflowAddNodes) Name() string {
+	return "Agent Workflow Add Nodes"
+}
+
+// Generate generates the AgentWorkflow asset.
+func (a *AgentWorkflowAddNodes) Generate(dependencies asset.Parents) error {
+	a.Workflow = AgentWorkflowTypeAddNodes
+	a.File = &asset.File{
+		Filename: agentWorkflowFilename,
+		Data:     []byte(a.Workflow),
+	}
+
+	return nil
+}

pkg/asset/agent/workflow/commons.go

@@ -0,0 +1,14 @@
+package workflow
+
+// AgentWorkflowType defines the supported
+// agent workflows.
+type AgentWorkflowType string
+
+const (
+	// AgentWorkflowTypeInstall identifies the install workflow.
+	AgentWorkflowTypeInstall AgentWorkflowType = "install"
+	// AgentWorkflowTypeAddNodes identifies the add nodes workflow.
+	AgentWorkflowTypeAddNodes AgentWorkflowType = "addnodes"
+
+	agentWorkflowFilename = ".agentworkflow"
+)

pkg/nodejoiner/addnodes.go

@@ -2,11 +2,26 @@ package nodejoiner
 
 import (
 	"github.com/openshift/installer/pkg/asset"
+	"github.com/openshift/installer/pkg/asset/agent/joiner"
+	"github.com/openshift/installer/pkg/asset/agent/workflow"
 	"github.com/openshift/installer/pkg/asset/store"
 )
 
 // NewAddNodesCommand creates a new command for add nodes.
-func NewAddNodesCommand(directory string) error {
+func NewAddNodesCommand(directory string, kubeConfig string) error {
+	// Store the current parameters into the assets folder, so
+	// that they could be retrieved later by the assets
+	params := joiner.Params{
+		Kubeconfig: kubeConfig,
+	}
+	err := params.Save(directory)
+	if err != nil {
+		return err
+	}
+
 	fetcher := store.NewAssetsFetcher(directory)
-	return fetcher.FetchAndPersist([]asset.WritableAsset{})
+	return fetcher.FetchAndPersist([]asset.WritableAsset{
+		&workflow.AgentWorkflowAddNodes{},
+		// To be completed
+	})
 }