Disable verity for VABC updates on android R

Bug: 230277030
Test: th
Change-Id: I2872c490c852fb7d3784721e191ece80b4b1fd58

tools/releasetools/common.py

@@ -454,6 +454,11 @@ class BuildInfo(object):
         vendor_prop.GetProp("ro.virtual_ab.compression.enabled") == "true"
     return vabc_enabled
 
+  @property
+  def is_android_r(self):
+    system_prop = self.info_dict.get("system.build.prop")
+    return system_prop and system_prop.GetProp("ro.build.version.release") == "11"
+
   @property
   def is_vabc_xor(self):
     vendor_prop = self.info_dict.get("vendor.build.prop")

tools/releasetools/ota_from_target_files.py

@@ -1145,6 +1145,14 @@ def GenerateAbOtaPackage(target_file, output_file, source_file=None):
       logger.info("Either source or target does not support VABC, disabling.")
       OPTIONS.disable_vabc = True
 
+    # Virtual AB Compression was introduced in Androd S.
+    # Later, we backported VABC to Android R. But verity support was not
+    # backported, so if VABC is used and we are on Android R, disable
+    # verity computation.
+    if not OPTIONS.disable_vabc and source_info.is_android_r:
+      OPTIONS.disable_verity_computation = True
+      OPTIONS.disable_fec_computation = True
+
   else:
     assert "ab_partitions" in OPTIONS.info_dict, \
         "META/ab_partitions.txt is required for ab_update."