No need to use rsync in hooks now to avoid file duplication since layer handling as a whole now uses rsync.

debian/changelog

@@ -8,6 +8,8 @@ livecd-rootfs (23.10.21) UNRELEASED; urgency=medium
     - Consolidate canary layers to merge 'classic' back into 'standard'
     - Reset /var/lib/snapd in the upper layers before calling snap
       prepare-image
+    - No need to use rsync in hooks now to avoid file duplication since layer
+      handling as a whole now uses rsync.
 
  -- Michael Hudson-Doyle <michael.hudson@ubuntu.com>  Wed, 23 Aug 2023 11:15:26 +1200
 

live-build/ubuntu/hooks/020-canary-enhanced-sb.binary

@@ -141,5 +141,5 @@ reset_snapd_state chroot
 env SNAPPY_STORE_NO_CDN=1 snap prepare-image \
     --classic config/classic-model.model $channel chroot
 mv chroot/system-seed/systems/* chroot/system-seed/systems/enhanced-secureboot-desktop
-rsync -a chroot/system-seed/ chroot/var/lib/snapd/seed
+rm -rf chroot/var/lib/snapd/seed
-rm -rf chroot/system-seed/
+mv chroot/system-seed chroot/var/lib/snapd/seed

live-build/ubuntu/hooks/020-canary-live.binary

@@ -137,8 +137,8 @@ reset_snapd_state chroot
 env SNAPPY_STORE_NO_CDN=1 snap prepare-image \
     --classic config/classic-model-installer.model $channel chroot
 mv chroot/system-seed/systems/* chroot/system-seed/systems/classic-installer
-rsync -a chroot/system-seed/ chroot/var/lib/snapd/seed
+rm -rf chroot/var/lib/snapd/seed
-rm -rf chroot/system-seed/
+mv chroot/system-seed chroot/var/lib/snapd/seed
 
 cat <<EOF  > chroot/var/lib/snapd/modeenv
 mode=run