Update scripts to use BusyBox standalone mode

scripts/util_functions.sh

@@ -56,13 +56,20 @@ resolve_vars() {
   SERVICED=$NVBASE/service.d
 }
 
+print_title() {
+  local len=$(echo -n $1 | wc -c)
+  len=$((len + 2))
+  local pounds=$(printf "%${len}s" | tr ' ' '*')
+  ui_print "$pounds"
+  ui_print " $1 "
+  ui_print "$pounds"
+}
+
 ######################
 # Environment Related
 ######################
 
 setup_flashable() {
-  # Preserve environment varibles
-  OLD_PATH=$PATH
   ensure_bb
   $BOOTMODE && return
   if [ -z $OUTFD ] || readlink /proc/$$/fd/$OUTFD | grep -q /tmp; then
@@ -79,18 +86,23 @@ setup_flashable() {
 }
 
 ensure_bb() {
-  if [ -x $MAGISKTMP/busybox/busybox ]; then
-    [ -z $BBDIR ] && BBDIR=$MAGISKTMP/busybox
-  elif [ -x $TMPDIR/bin/busybox ]; then
-    [ -z $BBDIR ] && BBDIR=$TMPDIR/bin
+  [ -o standalone ] && return
+  set -o standalone 2>/dev/null && return
+
+  # At this point, we are not running in BusyBox ash
+  # Find our busybox binary
+  local BUSYBOX
+  if [ -f $TMPDIR/busybox ]; then
+    BUSYBOX=$TMPDIR/busybox
+  elif [ -f $MAGISKBIN/busybox ]; then
+    BUSYBOX=$MAGISKBIN/busybox
   else
-    # Construct the PATH
-    [ -z $BBDIR ] && BBDIR=$TMPDIR/bin
-    mkdir -p $BBDIR
-    ln -s $MAGISKBIN/busybox $BBDIR/busybox
-    $MAGISKBIN/busybox --install -s $BBDIR
+    abort "! Cannot find BusyBox"
   fi
-  echo $PATH | grep -q "^$BBDIR" || export PATH=$BBDIR:$PATH
+
+  # Re-exec our script
+  chmod 755 $BUSYBOX
+  exec $BUSYBOX sh -o standalone $0 "$@"
 }
 
 recovery_actions() {
@@ -103,9 +115,6 @@ recovery_actions() {
   unset LD_LIBRARY_PATH
   unset LD_PRELOAD
   unset LD_CONFIG_FILE
-  # Force our own busybox path to be in the front
-  # and do not use anything in recovery's sbin
-  export PATH=$BBDIR:/system/bin:/vendor/bin
 }
 
 recovery_cleanup() {