Read the defaults for anode from defaults.conf

internal/pkg/node/constructors.go

@@ -14,11 +14,28 @@ import (
 )
 
 var ConfigFile string
+var DefaultConfig string
+
+// used as fallback if DefaultConfig can't be read
+var FallBackConf = `
+runtime overlay:
+- generic
+system overlay:
+- wwinit
+kernel:
+  args: quiet crashkernel=no vga=791
+init: /sbin/init
+root: initramfs
+profiles:
+- default`
 
 func init() {
 	if ConfigFile == "" {
 		ConfigFile = path.Join(buildconfig.SYSCONFDIR(), "warewulf/nodes.conf")
 	}
+	if DefaultConfig == "" {
+		DefaultConfig = path.Join(buildconfig.SYSCONFDIR(), "warewulf/defaults.conf")
+	}
 }
 
 func New() (NodeYaml, error) {
@@ -54,6 +71,27 @@ func (config *NodeYaml) FindAllNodes() ([]NodeInfo, error) {
 			return ret, err
 		}
 	*/
+	var defConf NodeConf
+	readBuildin := false
+	wwlog.Verbose("Opening defaults failed %s\n", DefaultConfig)
+	defData, err := ioutil.ReadFile(DefaultConfig)
+	if err != nil {
+		wwlog.Verbose("Couldn't read DefaultConfig :%s\n", err)
+	}
+	wwlog.Debug("Unmarshalling default config\n")
+	err = yaml.Unmarshal(defData, &defConf)
+	if err != nil {
+		readBuildin = true
+		wwlog.Verbose("Couldn't unmarshall defaults from file :%s\n", err)
+	}
+	if readBuildin {
+		wwlog.Verbose("Using building defaults")
+		err = yaml.Unmarshal([]byte(FallBackConf), &defConf)
+		if err != nil {
+			wwlog.Warn("Could not get any defaults")
+		}
+	}
+
 	wwlog.Debug("Finding all nodes...\n")
 	for nodename, node := range config.Nodes {
 		var n NodeInfo
@@ -63,13 +101,7 @@ func (config *NodeYaml) FindAllNodes() ([]NodeInfo, error) {
 		n.Tags = make(map[string]*Entry)
 		n.Kernel = new(KernelEntry)
 		n.Ipmi = new(IpmiEntry)
-		n.SystemOverlay.SetDefault("wwinit")
-		n.RuntimeOverlay.SetDefault("generic")
-		n.Ipxe.SetDefault("default")
-		n.Init.SetDefault("/sbin/init")
-		n.Root.SetDefault("initramfs")
-		n.Kernel.Args.SetDefault("quiet crashkernel=no vga=791")
-
+		n.SetDefFrom(&defConf)
 		fullname := strings.SplitN(nodename, ".", 2)
 		if len(fullname) > 1 {
 			n.ClusterName.SetDefault(fullname[1])
@@ -80,9 +112,9 @@ func (config *NodeYaml) FindAllNodes() ([]NodeInfo, error) {
 		} else {
 			n.Profiles.SetSlice(node.Profiles)
 		}
-		// node explciti nodename field in NodeConf
+		// node explicitly nodename field in NodeConf
 		n.Id.Set(nodename)
-		// backward compatibilty
+		// backward compatibility
 		for keyname, key := range node.Keys {
 			node.Tags[keyname] = key
 			delete(node.Keys, keyname)