Split live rootfs into smaller squashfs layers

iso/overlay/usr/local/bin/bee-install

@@ -8,7 +8,7 @@
 # Layout (UEFI):  GPT, /dev/sdX1=EFI 512MB vfat, /dev/sdX2=root ext4
 # Layout (BIOS):  MBR, /dev/sdX1=root ext4
 #
-# Squashfs source: /run/live/medium/live/filesystem.squashfs
+# Squashfs sources: /run/live/medium/live/*.squashfs
 
 set -euo pipefail
 
@@ -62,9 +62,9 @@ for tool in parted mkfs.vfat mkfs.ext4 unsquashfs grub-install update-grub; do
     fi
 done
 
-SQUASHFS="/run/live/medium/live/filesystem.squashfs"
-if [ ! -f "$SQUASHFS" ]; then
-    echo "ERROR: squashfs not found at $SQUASHFS" >&2
+mapfile -t SQUASHFS_FILES < <(find /run/live/medium/live -maxdepth 1 -type f -name '*.squashfs' | sort)
+if [ "${#SQUASHFS_FILES[@]}" -eq 0 ]; then
+    echo "ERROR: no squashfs files found under /run/live/medium/live" >&2
     echo "  The live medium may have been disconnected." >&2
     echo "  Reconnect the disc and run:  bee-remount-medium --wait" >&2
     echo "  Then re-run bee-install." >&2
@@ -106,7 +106,10 @@ log "=== BEE DISK INSTALLER ==="
 log "Target device : $DEVICE"
 log "Root partition: $PART_ROOT"
 [ "$UEFI" = "1" ] && log "EFI partition : $PART_EFI"
-log "Squashfs      : $SQUASHFS ($(du -sh "$SQUASHFS" | cut -f1))"
+log "Squashfs      : ${#SQUASHFS_FILES[@]} layer(s)"
+for sf in "${SQUASHFS_FILES[@]}"; do
+    log "  - $sf ($(du -sh "$sf" | cut -f1))"
+done
 log "Log           : $LOGFILE"
 log ""
 
@@ -163,7 +166,9 @@ log "  Mounted."
 
 # ------------------------------------------------------------------
 log "--- Step 5/7: Unpacking filesystem (this takes 10-20 minutes) ---"
-log "  Source: $SQUASHFS"
+for sf in "${SQUASHFS_FILES[@]}"; do
+    log "  Source: $sf"
+done
 log "  Target: $MOUNT_ROOT"
 
 # unsquashfs does not support resume, so retry the entire unpack step if the
@@ -177,9 +182,9 @@ while true; do
     fi
     [ "$UNPACK_ATTEMPTS" -gt 1 ] && log "  Retry attempt $UNPACK_ATTEMPTS / $UNPACK_MAX ..."
 
-    # Re-check squashfs is reachable before each attempt
-    if [ ! -f "$SQUASHFS" ]; then
-        log "  SOURCE LOST: $SQUASHFS not found."
+    mapfile -t SQUASHFS_FILES < <(find /run/live/medium/live -maxdepth 1 -type f -name '*.squashfs' | sort)
+    if [ "${#SQUASHFS_FILES[@]}" -eq 0 ]; then
+        log "  SOURCE LOST: no squashfs files found under /run/live/medium/live."
         log "  Reconnect the disc and run 'bee-remount-medium --wait' in another terminal,"
         log "  then press Enter here to retry."
         read -r _
@@ -194,12 +199,17 @@ while true; do
     fi
 
     UNPACK_OK=0
-    unsquashfs -f -d "$MOUNT_ROOT" "$SQUASHFS" 2>&1 | \
-        grep -E '^\[|^inod|^created|^extract|^ERROR|failed' | \
-        while IFS= read -r line; do log "  $line"; done || UNPACK_OK=$?
+    for sf in "${SQUASHFS_FILES[@]}"; do
+        log "  Unpacking $(basename "$sf") ..."
+        unsquashfs -f -d "$MOUNT_ROOT" "$sf" 2>&1 | \
+            grep -E '^\[|^inod|^created|^extract|^ERROR|failed' | \
+            while IFS= read -r line; do log "  $line"; done || UNPACK_OK=$?
+        [ "$UNPACK_OK" -eq 0 ] || break
+    done
 
     # Check squashfs is still reachable (gone = disc pulled during copy)
-    if [ ! -f "$SQUASHFS" ]; then
+    mapfile -t SQUASHFS_FILES < <(find /run/live/medium/live -maxdepth 1 -type f -name '*.squashfs' | sort)
+    if [ "${#SQUASHFS_FILES[@]}" -eq 0 ]; then
         log "  WARNING: source medium lost during unpack — will retry after remount."
         log "  Run 'bee-remount-medium --wait' in another terminal, then press Enter."
         read -r _

iso/overlay/usr/local/bin/bee-remount-medium

@@ -2,7 +2,7 @@
 # bee-remount-medium — find and remount the live ISO medium to /run/live/medium
 #
 # Run this after reconnecting the ISO source disc (USB/CD) if the live medium
-# was lost and /run/live/medium/live/filesystem.squashfs is missing.
+# was lost and /run/live/medium/live/*.squashfs are missing.
 #
 # Usage: bee-remount-medium [--wait]
 #   --wait  keep retrying every 5 seconds until the medium is found (useful
@@ -11,7 +11,7 @@
 set -euo pipefail
 
 MEDIUM_DIR="/run/live/medium"
-SQUASHFS_REL="live/filesystem.squashfs"
+SQUASHFS_GLOB="live/*.squashfs"
 WAIT_MODE=0
 
 for arg in "$@"; do
@@ -56,7 +56,7 @@ try_mount() {
     local tmpdir
     tmpdir=$(mktemp -d /tmp/bee-probe-XXXXXX)
     if mount -o ro "$dev" "$tmpdir" 2>/dev/null; then
-        if [ -f "${tmpdir}/${SQUASHFS_REL}" ]; then
+        if find "${tmpdir}/live" -maxdepth 1 -type f -name '*.squashfs' 2>/dev/null | grep -q .; then
             # Unmount probe mount and mount properly onto live path
             umount "$tmpdir" 2>/dev/null || true
             rmdir "$tmpdir"  2>/dev/null || true
@@ -82,8 +82,9 @@ attempt() {
     for dev in $(find_candidates); do
         log "  Trying $dev ..."
         if try_mount "$dev"; then
-            local sq="${MEDIUM_DIR}/${SQUASHFS_REL}"
-            log "SUCCESS: squashfs available at $sq ($(du -sh "$sq" | cut -f1))"
+            local count
+            count=$(find "${MEDIUM_DIR}/live" -maxdepth 1 -type f -name '*.squashfs' 2>/dev/null | wc -l | tr -d ' ')
+            log "SUCCESS: ${count} squashfs layer(s) available under ${MEDIUM_DIR}/live"
             return 0
         fi
     done
@@ -100,5 +101,5 @@ if [ "$WAIT_MODE" = "1" ]; then
         sleep 5
     done
 else
-    attempt || die "No ISO medium with ${SQUASHFS_REL} found. Reconnect the disc and re-run, or use --wait."
+    attempt || die "No ISO medium with ${SQUASHFS_GLOB} found. Reconnect the disc and re-run, or use --wait."
 fi