Major refactor for Cobra and new pkg/app structure for wwctl

internal/app/wwctl/build/vnfs/vnfs.go

@@ -0,0 +1,51 @@
+package vnfs
+
+import (
+	"github.com/hpcng/warewulf/internal/pkg/assets"
+	"github.com/hpcng/warewulf/internal/pkg/vnfs"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"strings"
+)
+
+var buildForce bool
+
+func Build(nodeList []assets.NodeInfo, force bool) (error) {
+	set := make(map[string]int)
+
+	wwlog.Printf(wwlog.INFO, "Importing VNFS Images:\n")
+	wwlog.SetIndent(4)
+
+	buildForce = force
+
+	for _, node := range nodeList {
+		if node.Vnfs != "" {
+			set[node.Vnfs] ++
+			wwlog.Printf(wwlog.DEBUG, "Node '%s' has VNFS '%s'\n", node.Fqdn, node.Vnfs)
+		}
+	}
+
+	for uri := range set {
+		v := vnfs.New(uri)
+		wwlog.Printf(wwlog.VERBOSE, "VNFS found: %s (nodes: %d)\n", uri, set[uri])
+		if strings.HasPrefix(uri, "docker://") {
+			BuildDocker(v)
+
+		} else if strings.HasPrefix(uri, "docker-daemon://") {
+			//wwlog.Printf(wwlog.INFO, "Building VNFS from Docker service: %s\n", uri)
+			wwlog.Printf(wwlog.INFO, "Building VNFS from Docker service is not supported yet: %s\n", uri)
+
+		} else if strings.HasPrefix(uri, "/") {
+			if strings.HasSuffix(uri, "tar.gz") {
+				//wwlog.Printf(wwlog.WARN, "Building VNFS from local tarball: %s\n", uri)
+				wwlog.Printf(wwlog.WARN, "Building VNFS from local tarball is not supported yet: %s\n", uri)
+
+			} else {
+				BuildContainerdir(v)
+			}
+		}
+	}
+
+	wwlog.SetIndent(0)
+
+	return nil
+}