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

internal/app/wwctl/build/kernel/kernel.go

@@ -0,0 +1,74 @@
+package kernel
+
+import (
+	"fmt"
+	"github.com/hpcng/warewulf/internal/pkg/assets"
+	"github.com/hpcng/warewulf/internal/pkg/config"
+	"github.com/hpcng/warewulf/internal/pkg/util"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"os"
+	"os/exec"
+	"path"
+)
+
+const kernelProvisionPath = "/provision/kernel/"
+
+func Build(nodeList []assets.NodeInfo, force bool) error {
+	set := make(map[string]int)
+
+	wwlog.Printf(wwlog.INFO, "Importing Kernels:\n")
+	wwlog.SetIndent(4)
+
+	for _, node := range nodeList {
+		if node.KernelVersion != "" {
+			set[node.KernelVersion] ++
+			wwlog.Printf(wwlog.DEBUG, "Node '%s' has KernelVersion '%s'\n", node.Fqdn, node.KernelVersion)
+		}
+	}
+
+	for kernelVersion := range set {
+		kernelImage := "/boot/vmlinuz-"+kernelVersion
+		kernelDrivers := "/lib/modules/"+kernelVersion
+		kernelDestination := path.Join(config.LocalStateDir, kernelProvisionPath, "vmlinuz-"+kernelVersion)
+		driversDestination := path.Join(config.LocalStateDir, kernelProvisionPath, "kmods-"+kernelVersion+".img")
+
+
+		// Create the kernel destination path just in case it doesn't exist
+		os.MkdirAll(path.Join(config.LocalStateDir, kernelProvisionPath), 0755)
+
+		if _, err := os.Stat(kernelImage); err == nil {
+			if util.PathIsNewer(kernelImage, kernelDestination) && force == false {
+				wwlog.Printf(wwlog.INFO, "%-35s: Skipping, kernel is current\n", "vmlinuz-"+kernelVersion)
+
+			} else {
+				err := util.CopyFile(kernelImage, kernelDestination)
+				if err != nil {
+					wwlog.Printf(wwlog.ERROR, "Failed copying kernel image: %s\n", err)
+					continue
+				}
+				wwlog.Printf(wwlog.INFO, "%-35s: Done\n", "vmlinuz-"+kernelVersion)
+
+			}
+		}
+
+		if _, err := os.Stat(kernelDrivers); err == nil {
+			if util.PathIsNewer(kernelDrivers, driversDestination) && force == false {
+				wwlog.Printf(wwlog.INFO, "%-35s: Skipping, kernel Drivers are current\n", "kmods-"+kernelVersion+".img")
+
+			} else {
+				cmd := fmt.Sprintf("cd /; find .%s | cpio --quiet -o -H newc -F \"%s\"", kernelDrivers, driversDestination)
+				err := exec.Command("/bin/sh", "-c", cmd).Run()
+				if err != nil {
+					wwlog.Printf(wwlog.ERROR, "Could not generate kernel driver overlay: %s\n", err)
+					continue
+				}
+				wwlog.Printf(wwlog.INFO, "%-35s: Done\n", "kmods-"+kernelVersion+".img")
+			}
+		}
+
+	}
+
+	wwlog.SetIndent(0)
+
+	return nil
+}