Lots of changes including: wwctl overlay list and framework for other commands

internal/pkg/overlay/runtime.go

@@ -0,0 +1,45 @@
+package overlay
+
+import (
+	"github.com/hpcng/warewulf/internal/pkg/config"
+	"github.com/hpcng/warewulf/internal/pkg/errors"
+	"github.com/hpcng/warewulf/internal/pkg/util"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"io/ioutil"
+	"os"
+)
+
+func FindAllRuntimeOverlays() ([]string, error) {
+	config := config.New()
+	var ret []string
+
+	wwlog.Printf(wwlog.DEBUG, "Looking for runtime overlays...")
+	files, err := ioutil.ReadDir(config.RuntimeOverlayDir())
+	if err != nil {
+		return ret, err
+	}
+
+	for _, file := range files {
+		wwlog.Printf(wwlog.DEBUG, "Evaluating runtime overlay: %s\n", file.Name())
+		if file.IsDir() == true {
+			ret = append(ret, file.Name())
+		}
+	}
+
+	return ret, nil
+}
+
+
+func RuntimeOverlayInit(name string) error {
+	config := config.New()
+
+	path := config.RuntimeOverlaySource(name)
+
+	if util.IsDir(path) == true {
+		return errors.New("Runtime overlay already exists: "+name)
+	}
+
+	err := os.MkdirAll(path, 0755)
+
+	return err
+}