Move wwctl kernel list to wwctl container kernels

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

internal/app/wwctl/container/kernels/main.go

@@ -0,0 +1,60 @@
+package kernels
+
+import (
+	"strconv"
+
+	"github.com/spf13/cobra"
+
+	"github.com/warewulf/warewulf/internal/app/wwctl/table"
+	"github.com/warewulf/warewulf/internal/pkg/container"
+	"github.com/warewulf/warewulf/internal/pkg/kernel"
+	"github.com/warewulf/warewulf/internal/pkg/node"
+)
+
+func CobraRunE(cmd *cobra.Command, args []string) error {
+	nodesYaml, err := node.New()
+	if err != nil {
+		return err
+	}
+	nodes, err := nodesYaml.FindAllNodes()
+	if err != nil {
+		return err
+	}
+	kernelNodes := make(map[kernel.Kernel]int)
+	for _, node := range nodes {
+		kernel_ := kernel.FromNode(&node)
+		if kernel_ != nil {
+			kernelNodes[*kernel_]++
+		}
+	}
+
+	var sources []string
+	if len(args) == 0 {
+		if sources_, err := container.ListSources(); err == nil {
+			sources = sources_
+		} else {
+			return err
+		}
+	} else {
+		sources = args
+	}
+
+	t := table.New(cmd.OutOrStdout())
+	t.AddHeader("Container", "Kernel", "Version", "Preferred", "Nodes")
+	for _, source := range sources {
+		containerKernels := kernel.FindKernels(source)
+		preferredKernel := containerKernels.Preferred()
+		for _, kernel_ := range containerKernels {
+			preferred := preferredKernel != nil && preferredKernel == kernel_
+			preferredStr := strconv.FormatBool(preferred)
+			nodeCount := kernelNodes[*kernel_]
+			if preferred {
+				nodeCount = nodeCount + kernelNodes[kernel.Kernel{ContainerName: source, Path: ""}]
+			}
+			t.AddLine(table.Prep([]string{source, kernel_.Path, kernel_.Version(), preferredStr, strconv.Itoa(nodeCount)})...)
+		}
+	}
+	t.Print()
+
+	return nil
+}