host templates

cmd/dkl-local-server/render-context.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"crypto/sha1"
 	"crypto/sha256"
 	"encoding/hex"
 	"fmt"
@@ -175,6 +176,17 @@ func (ctx *renderContext) TemplateFuncs() map[string]any {
 	funcs := templateFuncs(ctx.SSLConfig)
 
 	for name, method := range map[string]any{
+		"host_ip": func() (s string) {
+			return ctx.Host.IPs[0]
+		},
+		"host_name": func() (s string) {
+			return ctx.Host.Name
+		},
+		"machine_id": func() (s string) {
+			ba := sha1.Sum([]byte(ctx.Host.ClusterName + "/" + ctx.Host.Name))
+			return hex.EncodeToString(ba[:])
+		},
+
 		"ssh_host_keys": func(dir, cluster, host string) (s string, err error) {
 			if host == "" {
 				host = ctx.Host.Name