Backend: APEX mounts support improvements

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

@@ -57,9 +57,11 @@ setup_mountpoint() {
 }
 is_mounted() { $bb mount | $bb grep -q " $1 "; }
 umount_all() {
-  ($BOOTMODE || umount_apex;
-  $bb umount /system;
-  $bb umount -l /system;
+  (if ! $BOOTMODE; then
+    umount_apex;
+    $bb umount /system;
+    $bb umount -l /system;
+  fi;
   if [ -e /system_root ]; then
     $bb umount /system_root;
     $bb umount -l /system_root;
@@ -72,55 +74,56 @@ umount_all() {
   fi) 2>/dev/null;
 }
 mount_apex() {
-  [ -d /system/apex ] || return 1
-  [ -L /apex ] && rm -f /apex
-  if [ -f "/system/apex/com.android.runtime.release.apex" ]; then
-    local j=0
-    [ -e /dev/block/loop1 ] && local minorx=$(ls -l /dev/block/loop1 | $bb awk '{print $6}') || local minorx=1
-    for i in /system/apex/*.apex; do
-      local dest="/apex/$(basename $i | sed 's/.apex$//')"
-      [ "$dest" == "/apex/com.android.runtime.release" ] && dest="/apex/com.android.runtime"
-      mkdir -p $dest
-      $bb unzip -qo $i apex_payload.img -d /apex
-      mv -f /apex/apex_payload.img $dest.img
-      while [ $j -lt 50 ]; do
-        loop=/dev/loop$j
-        $bb mknod $loop b 7 $((j * minorx)) 2>/dev/null
-        $bb losetup $loop $dest.img 2>/dev/null
-        j=$((j + 1))
-        $bb losetup $loop | grep -q $dest.img && break
-      done;
-      uloop="$uloop $((j - 1))"
-      $bb mount -t ext4 -o loop,noatime,ro $loop $dest || return 1
-    done
-  # Already extracted payload imgs present, just mount the folders
-  elif [ -d "/system/apex/com.android.runtime.release" ]; then
-    for i in /system/apex/*; do
-      local dest="/apex/$(basename $i)"
-      [ "$dest" == "/apex/com.android.runtime.release" ] && dest="/apex/com.android.runtime"
-      mkdir -p $dest
-      $bb mount -o bind,ro $i $dest
-    done
-  fi
+  test -d /system/apex || return 1;
+  local apex dest loop minorx num;
+  setup_mountpoint /apex;
+  test -e /dev/block/loop1 && minorx=$(ls -l /dev/block/loop1 | $bb awk '{ print $6 }') || minorx=1;
+  num=0;
+  for apex in /system/apex/*; do
+    dest=/apex/$(basename $apex .apex);
+    test "$dest" == /apex/com.android.runtime.release && dest=/apex/com.android.runtime;
+    mkdir -p $dest;
+    case $apex in
+      *.apex)
+        $bb unzip -qo $apex apex_payload.img -d /apex;
+        $bb mv -f /apex/apex_payload.img $dest.img;
+        $bb mount -t ext4 -o ro,noatime $dest.img $dest 2>/dev/null;
+        if [ $? != 0 ]; then
+          while [ $num -lt 64 ]; do
+            loop=/dev/block/loop$num;
+            ($bb mknod $loop b 7 $((num * minorx));
+            $bb losetup $loop $dest.img) 2>/dev/null;
+            num=$((num + 1));
+            $bb losetup $loop | $bb grep -q $dest.img && break;
+          done;
+          $bb mount -t ext4 -o ro,loop,noatime $loop $dest;
+          if [ $? != 0 ]; then
+            $bb losetup -d $loop 2>/dev/null;
+          fi;
+        fi;
+      ;;
+      *) $bb mount -o bind $apex $dest;;
+    esac;
+  done;
 }
 umount_apex() {
-  [ -d /apex ] || return 1
-  for i in /apex/*; do
-    $bb umount -l $i 2>/dev/null
-  done
-  if [ -f "/system/apex/com.android.runtime.release.apex" ]; then
-    for i in $uloop; do
-      local loop=/dev/loop$i
-      losetup -d $loop 2>/dev/null || break
-    done
-  fi
-  rm -rf /apex
+  test -d /apex || return 1;
+  local dest loop;
+  for dest in $($bb find /apex -type d -mindepth 1 -maxdepth 1); do
+    if [ -f $dest.img ]; then
+      loop=$($bb mount | $bb grep $dest | $bb cut -d" " -f1);
+    fi;
+    ($bb umount -l $dest;
+    $bb losetup -d $loop) 2>/dev/null;
+  done;
+  rm -rf /apex;
 }
 restore_env() {
   test "$savedpath" && export LD_LIBRARY_PATH="$savedpath";
   test "$savedpre" && export LD_PRELOAD="$savedpre";
   umount_all;
-  ($bb mv -f /system_link /system;
+  ($bb mv -f /apex_link /apex;
+  $bb mv -f /system_link /system;
   $bb mv -f /system_root_link /system_root;
   $bb umount -l /dev/random) 2>/dev/null;
 }