Initial wwctl upgrade command

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/node/constructors.go

@@ -18,14 +18,17 @@ var (
 	ConfigFile string
 )
 
-/*
-Creates a new nodeDb object from the on-disk configuration
-*/
-func New() (NodesYaml, error) {
+func init() {
 	conf := warewulfconf.Get()
 	if ConfigFile == "" {
 		ConfigFile = path.Join(conf.Paths.Sysconfdir, "warewulf/nodes.conf")
 	}
+}
+
+/*
+Creates a new nodeDb object from the on-disk configuration
+*/
+func New() (NodesYaml, error) {
 	wwlog.Verbose("Opening node configuration file: %s", ConfigFile)
 	data, err := os.ReadFile(ConfigFile)
 	if err != nil {

internal/pkg/node/modifiers.go

@@ -109,12 +109,19 @@ func (config *NodesYaml) DelProfile(nodeID string) error {
 Write the the NodeYaml to disk.
 */
 func (config *NodesYaml) Persist() error {
+	return config.PersistToFile(ConfigFile)
+}
+
+func (config *NodesYaml) PersistToFile(configFile string) error {
+	if configFile == "" {
+		configFile = ConfigFile
+	}
 	out, dumpErr := config.Dump()
 	if dumpErr != nil {
 		wwlog.Error("%s", dumpErr)
 		return dumpErr
 	}
-	file, err := os.OpenFile(ConfigFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o644)
+	file, err := os.OpenFile(configFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o644)
 	if err != nil {
 		wwlog.Error("%s", err)
 		return err
@@ -124,7 +131,7 @@ func (config *NodesYaml) Persist() error {
 	if err != nil {
 		return err
 	}
-	wwlog.Debug("persisted: %s", ConfigFile)
+	wwlog.Debug("persisted: %s", configFile)
 	return nil
 }