Rename "container" to "image"

- Updated `wwctl upgrade` to handle updates
- Maintained `.Container` and `.ContainerName` in tstruct
- Added `ContainerName()` methods to node and profile objects
- Added `--container`, `-C` aliases to wwctl commands (`<node|profile> <add|set>`)
- Added `wwctl container` alias
- Added support for `container_exit.sh` if `image_exit.sh` is not found

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

internal/app/wwctl/image/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/image"
+	"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 := image.ListSources(); err == nil {
+			sources = sources_
+		} else {
+			return err
+		}
+	} else {
+		sources = args
+	}
+
+	t := table.New(cmd.OutOrStdout())
+	t.AddHeader("Image", "Kernel", "Version", "Default", "Nodes")
+	for _, source := range sources {
+		imageKernels := kernel.FindKernels(source)
+		defaultKernel := imageKernels.Default()
+		for _, kernel_ := range imageKernels {
+			isDefault := defaultKernel != nil && defaultKernel == kernel_
+			defaultStr := strconv.FormatBool(isDefault)
+			nodeCount := kernelNodes[*kernel_]
+			if isDefault {
+				nodeCount = nodeCount + kernelNodes[kernel.Kernel{ImageName: source, Path: ""}]
+			}
+			t.AddLine(table.Prep([]string{source, kernel_.Path, kernel_.Version(), defaultStr, strconv.Itoa(nodeCount)})...)
+		}
+	}
+	t.Print()
+
+	return nil
+}