AK3: detect flashing to inactive slot during OTA on VAB devices (#77)

META-INF/com/google/android/updater-script

@@ -3,4 +3,4 @@
 # Dummy file; update-binary is a shell script (DO NOT CHANGE)
 #
 #
-# AK_BASE_VERSION=20230406
+# AK_BASE_VERSION=20230416

tools/ak3-core.sh

@@ -415,7 +415,7 @@ flash_boot() {
 
 # flash_generic <name>
 flash_generic() {
-  local avb avbblock avbpath file flags img imgblock isro isunmounted path;
+  local avb avbblock avbpath file flags img imgblock imgsz isro isunmounted path;
 
   cd $home;
   for file in $1 $1.img; do
@@ -461,15 +461,22 @@ flash_generic() {
           cd $home;
         fi
       fi
+      imgsz=$(wc -c < $img);
+      if [ "$imgsz" != "$(wc -c < $imgblock)" ]; then
+        if [ -d /postinstall/tmp -a "$slot_select" == "inactive" ]; then
+          echo "Resizing $1$slot snapshot..." >&2;
+          $bin/snapshotupdater_static update $1 $imgsz || abort "Resizing $1$slot snapshot failed. Aborting...";
+        else
           echo "Removing any existing $1_ak3..." >&2;
           $bin/lptools_static remove $1_ak3;
           echo "Attempting to create $1_ak3..." >&2;
-      if $bin/lptools_static create $1_ak3 $(wc -c < $img); then
+          if $bin/lptools_static create $1_ak3 $imgsz; then
             echo "Replacing $1$slot with $1_ak3..." >&2;
             $bin/lptools_static unmap $1_ak3 || abort "Unmapping $1_ak3 failed. Aborting...";
             $bin/lptools_static map $1_ak3 || abort "Mapping $1_ak3 failed. Aborting...";
             $bin/lptools_static replace $1_ak3 $1$slot || abort "Replacing $1$slot failed. Aborting...";
             imgblock=/dev/block/mapper/$1_ak3;
+            ui_print " " "Warning: $1$slot replaced in super. Reboot before further logical partition operations.";
           else
             echo "Creating $1_ak3 failed. Attempting to resize $1$slot..." >&2;
             $bin/httools_static umount $1 || abort "Unmounting $1 failed. Aborting...";
@@ -477,10 +484,12 @@ flash_generic() {
               $bin/lptools_static unmap $1-verity || abort "Unmapping $1-verity failed. Aborting...";
             fi
             $bin/lptools_static unmap $1$slot || abort "Unmapping $1$slot failed. Aborting...";
-        $bin/lptools_static resize $1$slot $(wc -c < $img) || abort "Resizing $1$slot failed. Aborting...";
+            $bin/lptools_static resize $1$slot $imgsz || abort "Resizing $1$slot failed. Aborting...";
             $bin/lptools_static map $1$slot || abort "Mapping $1$slot failed. Aborting...";
             isunmounted=1;
           fi
+        fi
+      fi
     elif [ "$(wc -c < $img)" -gt "$(wc -c < $imgblock)" ]; then
       abort "New $1 image larger than $1 partition. Aborting...";
     fi;