Backend: fixes for booted flashing and addon.d-v2

- only do setup_env and restore_env when in recovery to prevent environment/mount issues post-install
- use busybox [ for simple integer test to ensure known numerical operator behavior

META-INF/com/google/android/update-binary

@@ -120,11 +120,10 @@ mount_all() {
       $BB mount -o bind /system_root/system /system;
     fi;
   fi;
-  $BOOTMODE || mount_apex;
+  mount_apex;
 }
 umount_all() {
-  (if ! $BOOTMODE; then
-    umount_apex;
+  (umount_apex;
   if [ ! -d /postinstall/tmp ]; then
     $BB umount /system;
     $BB umount -l /system;
@@ -133,7 +132,6 @@ umount_all() {
       $BB umount -l /system_root;
     fi;
   fi;
-  fi;
   umount /vendor;
   umount -l /vendor;
   if [ "$UMOUNT_DATA" ]; then
@@ -142,7 +140,8 @@ umount_all() {
   fi) 2>/dev/null;
 }
 setup_env() {
-  $BOOTMODE || $BB mount -o bind /dev/urandom /dev/random;
+  $BOOTMODE && return 1;
+  $BB mount -o bind /dev/urandom /dev/random;
   umount_all;
   mount_all;
   OLD_LD_PATH=$LD_LIBRARY_PATH;
@@ -166,6 +165,7 @@ setup_env() {
   fi;
 }
 restore_env() {
+  $BOOTMODE && return 1;
   local dir;
   unset -f getprop;
   test "$OLD_LD_PATH" && export LD_LIBRARY_PATH=$OLD_LD_PATH;
@@ -224,7 +224,7 @@ do_devicecheck() {
   fi;
 }
 int2ver() {
-  if [ "$1" -eq "$1" ] 2>/dev/null; then
+  if $BB [ "$1" -eq "$1" ] 2>/dev/null; then
     echo "$1.0.0";
   elif [ ! "$(echo "$1" | $BB cut -d. -f3)" ]; then
     echo "$1.0";