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/pkg/overlay/datastructure.go

@@ -39,8 +39,9 @@ type TemplateStruct struct {
 	AllNodes      []node.Node
 	node.Node
 	// backward compatiblity
-	Container string
-	ThisNode  *node.Node
+	Container     string
+	ContainerName string
+	ThisNode      *node.Node
 }
 
 /*
@@ -74,7 +75,8 @@ func InitStruct(overlayName string, nodeData node.Node, allNodes []node.Node) (T
 	// init some convenience vars
 	tstruct.Id = nodeData.Id()
 	tstruct.Hostname = nodeData.Id()
-	tstruct.Container = nodeData.ContainerName
+	tstruct.Container = nodeData.ImageName
+	tstruct.ContainerName = nodeData.ImageName
 	// Backwards compatibility for templates using "Keys"
 	tstruct.AllNodes = allNodes
 	dt := time.Now()

internal/pkg/overlay/funcmap.go

@@ -10,7 +10,7 @@ import (
 	"strings"
 
 	warewulfconf "github.com/warewulf/warewulf/internal/pkg/config"
-	"github.com/warewulf/warewulf/internal/pkg/container"
+	"github.com/warewulf/warewulf/internal/pkg/image"
 	"github.com/warewulf/warewulf/internal/pkg/node"
 	"github.com/warewulf/warewulf/internal/pkg/util"
 	"github.com/warewulf/warewulf/internal/pkg/wwlog"
@@ -73,32 +73,32 @@ func templateFileBlock(inc string, abortStr string) (string, error) {
 }
 
 /*
-Reads a file relative to given container.
+Reads a file relative to given image.
 Templates in the file are no evaluated.
 */
-func templateContainerFileInclude(containername string, filepath string) string {
-	wwlog.Verbose("Including file from Container into template: %s:%s", containername, filepath)
+func templateImageFileInclude(imagename string, filepath string) string {
+	wwlog.Verbose("Including file from Image into template: %s:%s", imagename, filepath)
 
-	if containername == "" {
-		wwlog.Warn("Container is not defined for node: %s", filepath)
+	if imagename == "" {
+		wwlog.Warn("Image is not defined for node: %s", filepath)
 		return ""
 	}
 
-	if !container.ValidSource(containername) {
-		wwlog.Warn("Template requires file(s) from non-existant container: %s:%s", containername, filepath)
+	if !image.ValidSource(imagename) {
+		wwlog.Warn("Template requires file(s) from non-existant image: %s:%s", imagename, filepath)
 		return ""
 	}
 
-	containerDir := container.RootFsDir(containername)
+	imageDir := image.RootFsDir(imagename)
 
-	wwlog.Debug("Including file from container: %s:%s", containerDir, filepath)
+	wwlog.Debug("Including file from image: %s:%s", imageDir, filepath)
 
-	if !util.IsFile(path.Join(containerDir, filepath)) {
-		wwlog.Warn("Requested file from container does not exist: %s:%s", containername, filepath)
+	if !util.IsFile(path.Join(imageDir, filepath)) {
+		wwlog.Warn("Requested file from image does not exist: %s:%s", imagename, filepath)
 		return ""
 	}
 
-	content, err := os.ReadFile(path.Join(containerDir, filepath))
+	content, err := os.ReadFile(path.Join(imageDir, filepath))
 
 	if err != nil {
 		wwlog.Error("Template include failed: %s", err)

internal/pkg/overlay/overlay.go

@@ -227,7 +227,7 @@ func FindOverlays() (overlayList []string, err error) {
 }
 
 /*
-Build the given overlays for a node and create a Image for them
+Build the given overlays for a node and create an image for them
 */
 func BuildOverlay(nodeConf node.Node, allNodes []node.Node, context string, overlayNames []string) error {
 	if len(overlayNames) == 0 && context == "" {
@@ -469,7 +469,7 @@ func RenderTemplateFile(fileName string, data TemplateStruct) (
 	// Build our FuncMap
 	funcMap := template.FuncMap{
 		"Include":      templateFileInclude,
-		"IncludeFrom":  templateContainerFileInclude,
+		"IncludeFrom":  templateImageFileInclude,
 		"IncludeBlock": templateFileBlock,
 		"ImportLink":   importSoftlink,
 		"basename":     path.Base,