need to store agent enrollment details (#967)

environment/env_core/model.go

@@ -30,6 +30,7 @@ type Root interface {
 
 	AgentSocket() (string, error)
 	AgentRegistry() (string, error)
+	AgentEnrollment() (string, error)
 }
 
 type Environment struct {

environment/env_v0_3/api.go

@@ -201,6 +201,10 @@ func (r *Root) AgentRegistry() (string, error) {
 	return "", errors.Errorf("this environment version does not support the zrok Agent; please 'zrok update' this environment")
 }
 
+func (r *Root) AgentEnrollment() (string, error) {
+	return "", errors.Errorf("this environment version does not support the zrok Agent; please 'zrok update' this environment")
+}
+
 func (r *Root) Obliterate() error {
 	zrd, err := rootDir()
 	if err != nil {

environment/env_v0_4/api.go

@@ -200,6 +200,10 @@ func (r *Root) AgentRegistry() (string, error) {
 	return agentRegistry()
 }
 
+func (r *Root) AgentEnrollment() (string, error) {
+	return agentEnrollment()
+}
+
 func (r *Root) Obliterate() error {
 	zrd, err := rootDir()
 	if err != nil {

environment/env_v0_4/dirs.go

@@ -69,3 +69,11 @@ func agentRegistry() (string, error) {
 	}
 	return filepath.Join(zrd, "agent-registry.json"), nil
 }
+
+func agentEnrollment() (string, error) {
+	zrd, err := rootDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(zrd, "agent-enrollment.json"), nil
+}