Refactor ignition support during dracut

- Control root device using the node/profile root field
- Add support for `/warewulf/wwinit.d` to run scripts during first stage
- Move first-stage ignition support to `/warewulf/wwinit.d/`
- Add `wwctl <node|profile> set --parttype`
- Add overlay template functions `SystemdEscape` and `SystemdEscapePath`
- Support configuring ignition with resources

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

internal/pkg/overlay/datastructure.go

@@ -8,7 +8,6 @@ import (
 	"time"
 
 	warewulfconf "github.com/warewulf/warewulf/internal/pkg/config"
-	"github.com/warewulf/warewulf/internal/pkg/image"
 	"github.com/warewulf/warewulf/internal/pkg/kernel"
 	"github.com/warewulf/warewulf/internal/pkg/node"
 )
@@ -39,7 +38,6 @@ type TemplateStruct struct {
 	Tftp          warewulfconf.TFTPConf
 	Paths         warewulfconf.BuildConfig
 	AllNodes      []node.Node
-	ImageList     []string
 	node.Node
 	// backward compatiblity
 	Container     string
@@ -50,7 +48,8 @@ type TemplateStruct struct {
 /*
 Initialize an TemplateStruct with the given node.NodeInfo
 */
-func InitStruct(overlayName string, nodeData node.Node, allNodes []node.Node) (tstruct TemplateStruct, err error) {
+func InitStruct(overlayName string, nodeData node.Node, allNodes []node.Node) (TemplateStruct, error) {
+	var tstruct TemplateStruct
 	tstruct.Overlay = overlayName
 	hostname, _ := os.Hostname()
 	tstruct.BuildHost = hostname
@@ -77,10 +76,6 @@ func InitStruct(overlayName string, nodeData node.Node, allNodes []node.Node) (t
 	// init some convenience vars
 	tstruct.Id = nodeData.Id()
 	tstruct.Hostname = nodeData.Id()
-	tstruct.ImageList, err = image.ListSources()
-	if err != nil {
-		return tstruct, err
-	}
 	tstruct.Container = nodeData.ImageName
 	tstruct.ContainerName = nodeData.ImageName
 	// Backwards compatibility for templates using "Keys"

internal/pkg/overlay/funcmap.go

@@ -102,7 +102,7 @@ func templateImageFileInclude(imagename string, filepath string) string {
 // Don't return an error as we use this function for template evaluation, so
 // error will turn up there as the return string
 func createIgnitionJson(node *node.Node) string {
-	conf, rep, err := node.GetConfig()
+	conf, rep, err := node.GetIgnitionConfig()
 	if len(conf.Storage.Disks) == 0 && len(conf.Storage.Filesystems) == 0 {
 		wwlog.Debug("no disks or filesystems present, don't create a json object")
 		return ""

internal/pkg/overlay/overlay.go

@@ -14,6 +14,7 @@ import (
 	"text/template"
 
 	"github.com/Masterminds/sprig/v3"
+	"github.com/coreos/go-systemd/v22/unit"
 
 	"github.com/warewulf/warewulf/internal/pkg/config"
 	"github.com/warewulf/warewulf/internal/pkg/node"
@@ -496,12 +497,7 @@ func RenderTemplateFile(fileName string, data TemplateStruct) (
 		"softlink":     softlink,
 		"readlink":     filepath.EvalSymlinks,
 		"IgnitionJson": func() string {
-			str := createIgnitionJson(data.ThisNode)
-			if str != "" {
-				return str
-			}
-			writeFile = false
-			return ""
+			return createIgnitionJson(data.ThisNode)
 		},
 		"abort": func() string {
 			wwlog.Debug("abort file called in %s", fileName)
@@ -513,7 +509,9 @@ func RenderTemplateFile(fileName string, data TemplateStruct) (
 			backupFile = false
 			return ""
 		},
-		"UniqueField": UniqueField,
+		"UniqueField":       UniqueField,
+		"SystemdEscape":     unit.UnitNameEscape,
+		"SystemdEscapePath": unit.UnitNamePathEscape,
 	}
 
 	// Merge sprig.FuncMap with our FuncMap