Refactor server to separate handlers

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

internal/pkg/warewulfd/grub.go

@@ -0,0 +1,33 @@
+package warewulfd
+
+import (
+	"net/http"
+
+	"github.com/warewulf/warewulf/internal/pkg/image"
+	"github.com/warewulf/warewulf/internal/pkg/wwlog"
+)
+
+// HandleGrub handles direct GRUB binary requests
+func HandleGrub(w http.ResponseWriter, req *http.Request) {
+	ctx, err := initHandleRequest(w, req)
+	if err != nil {
+		return // response already written
+	}
+
+	var stageFile string
+
+	if !ctx.remoteNode.Valid() {
+		wwlog.Error("%s (unknown/unconfigured node)", ctx.rinfo.hwaddr)
+	} else {
+		if ctx.remoteNode.ImageName != "" {
+			stageFile = image.GrubFind(ctx.remoteNode.ImageName)
+			if stageFile == "" {
+				wwlog.Error("No grub found for image %s", ctx.remoteNode.ImageName)
+			}
+		} else {
+			wwlog.Warn("No conainer set for node %s", ctx.remoteNode.Id())
+		}
+	}
+
+	sendResponse(w, req, stageFile, nil, ctx)
+}