+ mkdir -p "$ETCBACKUP_DIR"
+ # Avoid touching filesystem on each backup
+ RAMFS="$(mktemp -d -t sysupgrade.XXXXXX)"
+ mkdir -p "$RAMFS/upper" "$RAMFS/work"
+ mount -t overlay overlay -o lowerdir=$ETCBACKUP_DIR,upperdir=$RAMFS/upper,workdir=$RAMFS/work $ETCBACKUP_DIR &&
+ UMOUNT_ETCBACKUP_DIR=1 || {
+ echo "Cannot mount '$ETCBACKUP_DIR' as tmpfs to avoid touching disk while saving the list of installed packages." >&2
+ ask_bool 0 "Abort" && exit
+ }