add agent workflow asset

pkg/asset/agent/workflow/agentworkflow.go

@@ -0,0 +1,67 @@
+package workflow
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/openshift/installer/pkg/asset"
+	"github.com/pkg/errors"
+)
+
+// 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, errors.Wrap(err, fmt.Sprintf("failed to load %s file", agentWorkflowFilename))
+	}
+
+	// Get the current workflow
+	a.Workflow = AgentWorkflowType(file.Data)
+	a.File = file
+
+	return true, nil
+}

pkg/asset/agent/workflow/agentworkflowaddnodes.go

@@ -0,0 +1,28 @@
+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 +1,12 @@
+package workflow
+
+// AgentWorkflowType defines the supported
+// agent workflows.
+type AgentWorkflowType string
+
+const (
+	AgentWorkflowTypeInstall  AgentWorkflowType = "install"
+	AgentWorkflowTypeAddNodes AgentWorkflowType = "addnodes"
+
+	agentWorkflowFilename = ".agentworkflow"
+)