Ensure autobuilt overlays include contextual overlay contents.

Following #1249, autobuilt overlays were being built with no contents.

This change follows the pattern in `wwctl overlay build` to include configured
overlays when none are explicitly specified.

Inspired by #1296.

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

CHANGELOG.md

@@ -38,6 +38,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Replace slice in templates with sprig substr. #1093
 - Fix an invalid format issue for the GitHub nightly build action. #1258
 
+## v4.5.6, unreleased
+
+### Fixed
+
+- Ensure autobuilt overlays include contextual overlay contents. #1296
+
 ## v4.5.5, 2024-07-05
 
 ### Fixed

internal/pkg/warewulfd/util.go

@@ -63,7 +63,11 @@ func getOverlayFile(
 	}
 
 	if build {
-		err = overlay.BuildOverlay(n, context, stage_overlays)
+		if len(stage_overlays) > 0 {
+			err = overlay.BuildSpecificOverlays([]node.NodeInfo{n}, stage_overlays)
+		} else {
+			err = overlay.BuildAllOverlays([]node.NodeInfo{n})
+		}
 		if err != nil {
 			wwlog.Error("Failed to build overlay: %s, %s, %s\n%s",
 				n.Id.Get(), stage_overlays, stage_file, err)