Add optional Dracut support for installed images, enable it for Lubuntu.

debian/changelog

@@ -2,6 +2,7 @@ livecd-rootfs (25.04.3) UNRELEASED; urgency=medium
 
   * Switch Lubuntu to stacked squashfses, and split apart the common
     functionality to avoid Subiquity-specific commands.
+  * Add optional Dracut support for installed images, enable it for Lubuntu.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Sat, 23 Nov 2024 13:44:46 -0600
 

live-build/auto/config

@@ -695,6 +695,10 @@ common_layered_desktop_image() {
 		fi
 		# the minimal layer, for minimal installs
 		add_task minimal minimal standard $MINIMAL_TASKS
+		# If Dracut is enabled, include it early
+		if [ -n "$NEEDS_DRACUT" ]; then
+			add_package minimal dracut
+		fi
 		# fixme: this should go in seeds, not be in code here
 		add_package minimal cloud-init
 		add_package minimal linux-$KERNEL_FLAVOURS
@@ -724,6 +728,13 @@ common_layered_desktop_image() {
 	add_task ${LIVE_PREFIX}live "$LIVE_TASK"
 	add_package ${LIVE_PREFIX}live casper
 
+	# If Dracut is enabled, ensure it is removed in the live layer
+	# casper still depends on initramfs-tools
+	if [ -n "$NEEDS_DRACUT" ]; then
+		remove_package ${LIVE_PREFIX}live dracut
+		add_package ${LIVE_PREFIX}live initramfs-tools
+	fi
+
 	if [ -n "$LANGUAGE_BASE" ]; then
 		# language support
 		seeded_langs="$(get_seeded_languages $LANGUAGE_BASE)"
@@ -927,6 +938,7 @@ case $PROJECT in
 		MINIMAL_TASKS=lubuntu-desktop-minimal
 		MINIMAL_DESC="A minimal installation of the $UCFLAVOUR Desktop."
 		KERNEL_FLAVOURS=generic
+		NEEDS_DRACUT=yes
 		common_layered_desktop_image
 		;;
 

live-build/functions

@@ -1154,9 +1154,14 @@ divert_update_initramfs () {
 		--divert /usr/sbin/update-initramfs.REAL --rename \
 		/usr/sbin/update-initramfs"
 	cat > chroot/usr/sbin/update-initramfs <<'EOF'
-#! /bin/sh
+#!/bin/sh
 if [ $# != 1 ] || [ "$1" != -u ]; then
-	exec update-initramfs.REAL "$@"
+	if [ -x /usr/sbin/update-initramfs.REAL ]; then
+		exec /usr/sbin/update-initramfs.REAL "$@"
+	else
+		echo "update-initramfs.REAL not found. Skipping execution." >&2
+		exit 0
+	fi
 fi
 echo "update-initramfs: diverted by livecd-rootfs (will be called later)" >&2